First attempt at a UI phase compensation tool for MSK144

This builds on the static phase compensation in the MSK144 decoder and
the phase  analysis and  polynomial fitting  capabilities also  in teh
MSK144 decoder,  by allowing  captured data to  be selected  for phase
equalization from the WSJT-X UI.

Reads  captured phase  compensation  curve  estimate files  containing
fitted  polynomial coefficients  and measured  phase data  from MSK144
receptions. Intent  is to select a  compensation curve that is  from a
known transmitter like  an SDR which have good  phase linearity. Phase
plots and compensation polynomials may be viewed and compared with the
current compensation polynomial. A  suitable polynomial can be applied
to be use in all further decoding of MSK144 signals.

Plots of  the currently  selected polynomial  and its  modified higher
order terms  polynomial which is  actually used in  equalization (this
plot may  be dropped - it  is just for  kicks at the moment).   When a
captured phase analysis file is loaded plots of the measured phase and
the proposed best fit polynomial are shown.

Basic  maintenance  is also  included  allowing  clearing and  loading
captured  plots and  an option  to revert  to a  flat no  equalization
curve.

More to come on this as  amplitude equalization is also possible, this
will probably  be similar, maybe even  plotted on the same  graph with
dual  axes  for phase  and  amplitude.   Amplitude correction  from  a
measured  reference   spectrum  could  be  viewed   and  selected  for
equalization for all modes. TBC...

This   change    also   introduces    the   QCustomPlot    3rd   party
widget. Currently this  is statically linked from a  qcp library built
by the WSJT-X CMake script. This will probably be migrated to a shared
object (DLL) build as a CMake external project, once some CMake script
re-factoring  has been  completed,  which  is more  in  line with  the
QCustomPlot author's  intentions. This  will allow efficient  reuse in
other tools shipped with WSJT-X.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7570 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

CMakeLists.txt

@@ -237,6 +237,7 @@ set (wsjt_qt_CXXSRCS
   MaidenheadLocatorValidator.cpp
   CallsignValidator.cpp
   SplashScreen.cpp
+  PhaseEqualizationDialog.cpp
   )
 
 set (wsjt_qtmm_CXXSRCS
@@ -581,12 +582,17 @@ set (message_aggregator_STYLESHEETS
   UDPExamples/qss/default.qss
   )
 
+set (qcp_CXXSRCS
+  qcustomplot-source/qcustomplot.cpp
+  )
+
 set (all_CXXSRCS
   ${wsjt_CXXSRCS}
   ${wsjt_qt_CXXSRCS}
   ${wsjt_qtmm_CXXSRCS}
   ${jt9_CXXSRCS}
   ${wsjtx_CXXSRCS}
+  ${qcp_CXXSRCS}
   )
 
 set (all_C_and_CXXSRCS
@@ -747,6 +753,7 @@ message (STATUS "hamlib_LIBRARY_DIRS: ${hamlib_LIBRARY_DIRS}")
 # Widgets finds its own dependencies.
 find_package (Qt5Widgets 5 REQUIRED)
 find_package (Qt5Multimedia 5 REQUIRED)
+find_package (Qt5PrintSupport 5 REQUIRED)
 
 if (WIN32)
   add_definitions (-DQT_NEEDS_QTMAIN)
@@ -1011,11 +1018,16 @@ if (${OPENMP_FOUND} OR APPLE)
   endif (APPLE)
 endif (${OPENMP_FOUND} OR APPLE)
 
+# build a library for the QCustomPlot widget
+add_library (qcp STATIC ${qcp_CXXSRCS})
+target_include_directories (qcp PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/qcustomplot-source>)
+target_link_libraries (qcp Qt5::Widgets Qt5::PrintSupport)
+
 # build a library of package Qt functionality
 add_library (wsjt_qt STATIC ${wsjt_qt_CXXSRCS} ${wsjt_qt_GENUISRCS} ${GENAXSRCS})
 # set wsjtx_udp exports to static variants
 target_compile_definitions (wsjt_qt PUBLIC UDP_STATIC_DEFINE)
-target_link_libraries (wsjt_qt Qt5::Widgets Qt5::Network)
+target_link_libraries (wsjt_qt qcp Qt5::Widgets Qt5::Network)
 target_include_directories (wsjt_qt BEFORE PRIVATE ${hamlib_INCLUDE_DIRS})
 if (WIN32)
   target_link_libraries (wsjt_qt Qt5::AxContainer Qt5::AxBase)

Configuration.cpp

@@ -541,7 +541,6 @@ private:
   bool twoPass_;
   bool x2ToneSpacing_;
   bool contestMode_;
-  bool rxEqualize_;
   bool realTimeDecode_;
   QString udp_server_name_;
   port_type udp_server_port_;
@@ -630,7 +629,6 @@ bool Configuration::single_decode () const {return m_->single_decode_;}
 bool Configuration::twoPass() const {return m_->twoPass_;}
 bool Configuration::x2ToneSpacing() const {return m_->x2ToneSpacing_;}
 bool Configuration::contestMode() const {return m_->contestMode_;}
-bool Configuration::rxEqualize() const {return m_->rxEqualize_;}
 bool Configuration::realTimeDecode() const {return m_->realTimeDecode_;}
 bool Configuration::split_mode () const {return m_->split_mode ();}
 QString Configuration::udp_server_name () const {return m_->udp_server_name_;}
@@ -1060,7 +1058,6 @@ void Configuration::impl::initialize_models ()
   ui_->cbTwoPass->setChecked(twoPass_);
   ui_->cbx2ToneSpacing->setChecked(x2ToneSpacing_);
   ui_->cbContestMode->setChecked(contestMode_);
-  ui_->cbRxEqualize->setChecked(rxEqualize_);
   ui_->cbRealTime->setChecked(realTimeDecode_);
   ui_->cbRealTime->setVisible(false);                    //Tempoary -- probably will remove this control
   ui_->type_2_msg_gen_combo_box->setCurrentIndex (type_2_msg_gen_);
@@ -1289,7 +1286,6 @@ void Configuration::impl::read_settings ()
   twoPass_ = settings_->value("TwoPass",true).toBool ();
   x2ToneSpacing_ = settings_->value("x2ToneSpacing",false).toBool ();
   contestMode_ = settings_->value("ContestMode",false).toBool ();
-  rxEqualize_ = settings_->value("RxEqualize",false).toBool ();
   realTimeDecode_ = settings_->value("RealTimeDecode",false).toBool ();
   rig_params_.poll_interval = settings_->value ("Polling", 0).toInt ();
   rig_params_.split_mode = settings_->value ("SplitMode", QVariant::fromValue (TransceiverFactory::split_mode_none)).value<TransceiverFactory::SplitMode> ();
@@ -1389,7 +1385,6 @@ void Configuration::impl::write_settings ()
   settings_->setValue ("TwoPass", twoPass_);
   settings_->setValue ("x2ToneSpacing", x2ToneSpacing_);
   settings_->setValue ("ContestMode", contestMode_);
-  settings_->setValue ("RxEqualize", rxEqualize_);
   settings_->setValue ("RealTimeDecode", realTimeDecode_);
   settings_->setValue ("UDPServer", udp_server_name_);
   settings_->setValue ("UDPServerPort", udp_server_port_);
@@ -1785,7 +1780,6 @@ void Configuration::impl::accept ()
   twoPass_ = ui_->cbTwoPass->isChecked ();
   x2ToneSpacing_ = ui_->cbx2ToneSpacing->isChecked ();
   contestMode_ = ui_->cbContestMode->isChecked ();
-  rxEqualize_ = ui_->cbRxEqualize->isChecked ();
   realTimeDecode_ = ui_->cbRealTime->isChecked ();
   frequency_calibration_intercept_ = ui_->calibration_intercept_spin_box->value ();
   frequency_calibration_slope_ppm_ = ui_->calibration_slope_ppm_spin_box->value ();

Configuration.hpp

@@ -123,7 +123,6 @@ public:
   bool twoPass() const;
   bool x2ToneSpacing() const;
   bool contestMode() const;
-  bool rxEqualize() const;
   bool realTimeDecode() const;
   bool MyDx() const;
   bool CQMyN() const;

Configuration.ui

@@ -2,14 +2,6 @@
 <ui version="4.0">
  <class>configuration_dialog</class>
  <widget class="QDialog" name="configuration_dialog">
-  <property name="geometry">
-   <rect>
-    <x>0</x>
-    <y>0</y>
-    <width>545</width>
-    <height>591</height>
-   </rect>
-  </property>
   <property name="windowTitle">
    <string>Settings</string>
   </property>
@@ -2295,16 +2287,6 @@ Right click for insert and delete options.</string>
            </widget>
           </item>
           <item row="8" column="0">
-           <widget class="QCheckBox" name="cbRxEqualize">
-            <property name="toolTip">
-             <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Correct for Rx filter group-delay variation.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
-            </property>
-            <property name="text">
-             <string>MSK144 Rx Equalization</string>
-            </property>
-           </widget>
-          </item>
-          <item row="9" column="0">
            <widget class="QCheckBox" name="cbx2ToneSpacing">
             <property name="toolTip">
              <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Generate Tx audio with twice the normal tone spacing.  Intended for special LF/MF transmitters that use a divide-by-2 before generating RF.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
@@ -2314,7 +2296,7 @@ Right click for insert and delete options.</string>
             </property>
            </widget>
           </item>
-          <item row="10" column="0">
+          <item row="9" column="0">
            <widget class="QCheckBox" name="cbRealTime">
             <property name="enabled">
              <bool>false</bool>
@@ -2521,7 +2503,6 @@ soundcard changes</string>
   <tabstop>sbBandwidth</tabstop>
   <tabstop>sbTxDelay</tabstop>
   <tabstop>cbContestMode</tabstop>
-  <tabstop>cbRxEqualize</tabstop>
   <tabstop>cbx2ToneSpacing</tabstop>
   <tabstop>cbRealTime</tabstop>
  </tabstops>
@@ -2593,12 +2574,12 @@ soundcard changes</string>
   </connection>
  </connections>
  <buttongroups>
+  <buttongroup name="TX_mode_button_group"/>
+  <buttongroup name="CAT_data_bits_button_group"/>
+  <buttongroup name="PTT_method_button_group"/>
   <buttongroup name="TX_audio_source_button_group"/>
   <buttongroup name="CAT_stop_bits_button_group"/>
   <buttongroup name="split_mode_button_group"/>
-  <buttongroup name="CAT_data_bits_button_group"/>
   <buttongroup name="CAT_handshake_button_group"/>
-  <buttongroup name="PTT_method_button_group"/>
-  <buttongroup name="TX_mode_button_group"/>
  </buttongroups>
 </ui>

PhaseEqualizationDialog.cpp

@@ -0,0 +1,331 @@
+#include "PhaseEqualizationDialog.hpp"
+
+#include <iterator>
+#include <algorithm>
+#include <fstream>
+
+#include <QDir>
+#include <QVector>
+#include <QVBoxLayout>
+#include <QDialog>
+#include <QDialogButtonBox>
+#include <QPushButton>
+#include <QFileDialog>
+#include <QSettings>
+
+#include "SettingsGroup.hpp"
+#include "qcustomplot.h"
+#include "pimpl_impl.hpp"
+
+namespace
+{
+  char const * const title = "Phase Equalization";
+  size_t constexpr intervals = 144;
+
+  // plot data loaders - wraps a plot providing value_type and
+  // push_back so that a std::back_inserter output iterator can be
+  // used to load plot data
+  template<typename T>
+  struct plot_data_loader
+  {
+  public:
+    typedef T value_type;
+
+    plot_data_loader (QCustomPlot * plot, int graph_index)
+      : plot_ {plot}
+      , index_ {graph_index }
+    {
+    }
+
+    // load point into graph
+    void push_back (value_type const& d)
+    {
+      plot_->graph (index_)->data ()->add (d);
+    }
+
+  private:
+    QCustomPlot * plot_;
+    int index_;
+  };
+
+  typedef plot_data_loader<QCPGraphData> graph_loader_type;
+
+  // generate points of type T for a 5 term polynomial for x in
+  // (-1..+1) with N intervals and function S to scale X
+  //
+  // it is up to the user to call the generator sufficient times which
+  // is interval+1 times to reach +1
+  template<typename R, typename T, typename S>
+  struct poly_generator
+  {
+  public:
+    poly_generator (QVector<T> const& coeffs, size_t intervals, S scaling = [] (T x) {return x;})
+      : x_ {0}
+      , intervals_ {intervals}
+      , scaling_ {scaling}
+      , coeffs_ {coeffs}
+    {
+    }
+
+    R operator () ()
+    {
+      T x {x_++ * 2.f / intervals_ - 1.f};
+      return {scaling_ (x), coeffs_[0] + x * (coeffs_[1] + x * (coeffs_[2] + x * (coeffs_[3] + x * coeffs_[4])))};
+    }
+
+    size_t intervals () const {return intervals_;}
+
+  private:
+    int x_;
+    size_t intervals_;
+    S scaling_;
+    QVector<T> coeffs_;
+  };
+
+  // make our n=5 polynomial single precision FP generator of
+  // QCPGraphData type points with intervals intervals
+  template<typename S>
+  auto make_poly_generator (QVector<float> const& coeffs, S x_scaling)
+    -> poly_generator<QCPGraphData, float, decltype (x_scaling)>
+  {
+    return poly_generator<QCPGraphData, float, decltype (x_scaling)> {coeffs, intervals, x_scaling};
+  }
+
+  // a lambda that scales the X axis appropriately
+  auto x_scaling = [] (float x) -> float {return 1500. + 1000 * x;};
+}
+
+// read a phase point line from a stream
+std::istream& operator >> (std::istream& is, graph_loader_type::value_type& v)
+{
+  float pp, sigmay;          // discard these
+  is >> v.key >> pp >> v.value >> sigmay;
+  v.key = 1500. + 1000. * v.key;  // scale frequency to Hz
+  return is;
+}
+
+class PhaseEqualizationDialog::impl final
+  : public QDialog
+{
+  Q_OBJECT
+
+public:
+  explicit impl (PhaseEqualizationDialog * self, QSettings * settings
+                 , QDir const& data_directory, QVector<float> const& coefficients
+                 , QWidget * parent);
+  ~impl () {save_window_state ();}
+
+protected:
+  void closeEvent (QCloseEvent * e) override
+  {
+    save_window_state ();
+    QDialog::closeEvent (e);
+  }
+
+private:
+  void save_window_state ()
+  {
+    SettingsGroup g (settings_, title);
+    settings_->setValue ("geometry", saveGeometry ());
+  }
+
+  void plot_current ();
+  void plot ();
+
+  PhaseEqualizationDialog * self_;
+  QSettings * settings_;
+  QDir data_directory_;
+  QVBoxLayout layout_;
+  QVector<float> current_coefficients_;
+  QVector<float> new_coefficients_;
+  QCustomPlot plot_;
+  QDialogButtonBox button_box_;
+};
+
+#include "PhaseEqualizationDialog.moc"
+
+PhaseEqualizationDialog::PhaseEqualizationDialog (QSettings * settings
+                                                  , QDir const& data_directory
+                                                  , QVector<float> const& coefficients
+                                                  , QWidget * parent)
+  : m_ {this, settings, data_directory, coefficients, parent}
+{
+}
+
+void PhaseEqualizationDialog::show ()
+{
+  m_->show ();
+}
+
+PhaseEqualizationDialog::impl::impl (PhaseEqualizationDialog * self
+                                     , QSettings * settings
+                                     , QDir const& data_directory
+                                     , QVector<float> const& coefficients
+                                     , QWidget * parent)
+  : QDialog {parent}
+  , self_ {self}
+  , settings_ {settings}
+  , data_directory_ {data_directory}
+  , current_coefficients_ {coefficients}
+  , button_box_ {QDialogButtonBox::Discard | QDialogButtonBox::Apply
+        | QDialogButtonBox::RestoreDefaults | QDialogButtonBox::Close}
+{
+  setWindowTitle (windowTitle () + ' ' + tr (title));
+  resize (500, 600);
+  {
+    SettingsGroup g {settings_, title};
+    restoreGeometry (settings_->value ("geometry", saveGeometry ()).toByteArray ());
+  }
+  layout_.addWidget (&plot_);
+
+  plot_.xAxis->setLabel (tr ("Freq (Hz)"));
+  plot_.yAxis->setLabel (tr ("Phase (Radians)"));
+  plot_.legend->setVisible (true);
+  plot_.setInteractions (QCP::iRangeDrag | QCP::iRangeZoom);
+  plot_.axisRect ()->setRangeDrag (Qt::Vertical);
+  plot_.axisRect ()->setRangeZoom (Qt::Vertical);
+
+  plot_.addGraph ();
+  plot_.graph ()->setName (tr ("Measured"));
+  plot_.graph ()->setPen (QPen {Qt::blue});
+  plot_.graph ()->setVisible (false);
+  plot_.graph ()->removeFromLegend ();
+
+  plot_.addGraph ();
+  plot_.graph ()->setName (tr ("Proposed"));
+  plot_.graph ()->setPen (QPen {Qt::red});
+  plot_.graph ()->setVisible (false);
+  plot_.graph ()->removeFromLegend ();
+
+  plot_.addGraph ();
+  plot_.graph ()->setName (tr ("Current"));
+  plot_.graph ()->setPen (QPen {Qt::green});
+
+  plot_.addGraph ();
+  plot_.graph ()->setName (tr ("Current as Used"));
+  plot_.graph ()->setPen (QPen {Qt::darkGreen});
+
+  auto load_button = button_box_.addButton (tr ("Load ..."), QDialogButtonBox::ActionRole);
+  layout_.addWidget (&button_box_);
+  setLayout (&layout_);
+
+  connect (&button_box_, &QDialogButtonBox::rejected, this, &QDialog::reject);
+  connect (&button_box_, &QDialogButtonBox::clicked, [this, load_button] (QAbstractButton * button) {
+      if (button == load_button)
+        {
+          plot ();
+        }
+      else if (button == button_box_.button (QDialogButtonBox::Apply))
+        {
+          if (plot_.graph (0)->dataCount ()) // something loaded
+            {
+              current_coefficients_ = new_coefficients_;
+              Q_EMIT self_->phase_equalization_changed (current_coefficients_);
+              plot_current ();
+            }
+        }
+      else if (button == button_box_.button (QDialogButtonBox::RestoreDefaults))
+        {
+          current_coefficients_ = QVector<float> {0., 0., 0., 0., 0.};
+          Q_EMIT self_->phase_equalization_changed (current_coefficients_);
+          plot_current ();
+        }
+      else if (button == button_box_.button (QDialogButtonBox::Discard))
+        {
+          new_coefficients_ = QVector<float> {0., 0., 0., 0., 0.};
+
+          plot_.graph (0)->data ()->clear ();
+          plot_.graph (0)->setVisible (false);
+          plot_.graph (0)->removeFromLegend ();
+
+          plot_.graph (1)->data ()->clear ();
+          plot_.graph (1)->setVisible (false);
+          plot_.graph (1)->removeFromLegend ();
+
+          plot_.graph (2)->rescaleAxes ();
+          plot_.graph (3)->rescaleValueAxis (true);
+
+          plot_.replot ();
+        }
+    });
+
+  plot_current ();
+}
+
+void PhaseEqualizationDialog::impl::plot_current ()
+{
+  plot_.graph (2)->data ()->clear ();
+  plot_.graph (3)->data ()->clear ();
+  {
+    graph_loader_type graph {&plot_, 2};
+    std::generate_n (std::back_inserter (graph), intervals + 1, make_poly_generator (current_coefficients_, x_scaling));
+  }
+  {
+    // plot the adjusted polynomial using only the three high order terms
+    graph_loader_type graph {&plot_, 3};
+    QVector<float> reduced {current_coefficients_};
+    reduced[0] = 0.f;
+    reduced[1] = 0.f;
+    std::generate_n (std::back_inserter (graph), intervals + 1, make_poly_generator (reduced, x_scaling));
+  }
+  plot_.graph (2)->rescaleAxes ();
+  plot_.graph (3)->rescaleValueAxis (true);
+  if (plot_.graph (0)->dataCount ())
+    {
+      plot_.graph (0)->rescaleValueAxis (true);
+      plot_.graph (1)->rescaleValueAxis (true);
+    }
+  plot_.replot ();
+}
+
+void PhaseEqualizationDialog::impl::plot ()
+{
+  auto const& name = QFileDialog::getOpenFileName (this
+                                                   , "Select Phase Response Coefficients"
+                                                   , data_directory_.absolutePath ()
+                                                   , "Phase Coefficient Files (*.pcoeff)");
+  if (name.size ())
+    {
+      std::ifstream coeffs_source (name.toLatin1 ().constData (), std::ifstream::in);
+      int n;
+      float chi;
+      float rmsdiff;
+      // read header information
+      coeffs_source >> n >> chi >> rmsdiff;
+      {
+        std::istream_iterator<float> isi {coeffs_source};
+        new_coefficients_.clear ();
+        std::copy_n (isi, 5, std::back_inserter (new_coefficients_));
+      }
+
+      plot_.graph (0)->data ()->clear ();
+      plot_.graph (1)->data ()->clear ();
+      {
+        // read the phase data to plot into graph 0
+        graph_loader_type graph {&plot_, 0};
+        std::istream_iterator<graph_loader_type::value_type> start {coeffs_source};
+        std::copy_n (start, intervals + 1, std::back_inserter (graph));
+      }
+      {
+        // generate the proposed polynomial plot in graph 1
+        graph_loader_type graph {&plot_, 1};
+        std::generate_n (std::back_inserter (graph), intervals + 1, make_poly_generator (new_coefficients_, x_scaling));
+      }
+      plot_.graph (0)->setVisible (true);
+      plot_.graph (0)->addToLegend ();
+      plot_.graph (0)->rescaleAxes ();
+
+      plot_.graph (1)->setVisible (true);
+      plot_.graph (1)->addToLegend ();
+      plot_.graph (1)->rescaleValueAxis (true);
+
+      if (plot_.graph (2)->dataCount ())
+        {
+          plot_.graph (2)->rescaleValueAxis (true);
+          plot_.graph (3)->rescaleValueAxis (true);
+        }
+      plot_.replot ();
+    }
+}
+
+#include "moc_PhaseEqualizationDialog.cpp"

PhaseEqualizationDialog.hpp

@@ -0,0 +1,31 @@
+#ifndef PHASE_EQUALIZATION_DIALOG_HPP__
+#define PHASE_EQUALIZATION_DIALOG_HPP__
+
+#include <QObject>
+
+#include "pimpl_h.hpp"
+
+class QWidget;
+class QSettings;
+class QDir;
+
+class PhaseEqualizationDialog
+  : public QObject
+{
+  Q_OBJECT
+
+public:
+  explicit PhaseEqualizationDialog (QSettings *
+                                    , QDir const& data_directory
+                                    , QVector<float> const& coefficients
+                                    , QWidget * = nullptr);
+  Q_SLOT void show ();
+
+  Q_SIGNAL void phase_equalization_changed (QVector<float> const&);
+
+private:
+  class impl;
+  pimpl<impl> m_;
+};
+
+#endif

lib/analytic.f90

@@ -6,8 +6,7 @@ subroutine analytic(d,npts,nfft,c,dpc,bseq,bdeq)
 
   real d(npts)              ! passband signal
   real h(NFFTMAX/2)         ! real BPF magnitude
-  real dpc(3),dpclast(3)    ! dynamic phase coeffs
+  real dpc(5)               ! dynamic phase coeffs
-  real spc(3),spclast(3)    ! static phase coeffs
   real sac(5),saclast(5)    ! amp coeffs
   real fp     
 
@@ -21,12 +20,10 @@ subroutine analytic(d,npts,nfft,c,dpc,bseq,bdeq)
 
   data nfft0/0/
   data bseqlast/.false./
-  data spclast/0.0,0.0,0.0/
   data saclast/1.0,0.0,0.0,0.0,0.0/
-  data spc/-0.952,0.768,-0.565/  ! baseline phase coeffs for TS2000
   data sac/1.0,0.05532,0.11438,0.12918,0.09274/ ! amp coeffs for TS2000
 
-  save corrs,corrd,nfft0,h,sac,spc,saclast,spclast,dpclast,pi,t,beta
+  save corrs,corrd,nfft0,h,sac,saclast,pi,t,beta
 
   df=12000.0/nfft
   nh=nfft/2
@@ -47,18 +44,14 @@ subroutine analytic(d,npts,nfft,c,dpc,bseq,bdeq)
      nfft0=nfft
   endif
 
-  if( any(spclast .ne. spc) .or. any(saclast .ne. sac) .or. any(dpclast .ne. dpc) ) then
+  if( any(saclast .ne. sac) ) then
-     spclast=spc
-     dpclast=dpc
      saclast=sac
      do i=1,nh+1
         ff=(i-1)*df
         f=ff-1500.0
         fp=f/1000.0
-        ps=fp*fp*(spc(1)+fp*(spc(2)+fp*spc(3)))
+        corrs(i)=sac(1)+fp*(sac(2)+fp*(sac(3)+fp*(sac(4)+fp*sac(5))))
-        amp=sac(1)+fp*(sac(2)+fp*(sac(3)+fp*(sac(4)+fp*sac(5))))
+        pd=fp*fp*(dpc(3)+fp*(dpc(4)+fp*dpc(5))) ! ignore 1st two terms
-        corrs(i)=amp*cmplx(cos(ps),sin(ps))
-        pd=fp*fp*(dpc(1)+fp*(dpc(2)+fp*dpc(3)))
         corrd(i)=cmplx(cos(pd),sin(pd))
      enddo
   endif

lib/hspec.f90

@@ -1,5 +1,6 @@
 subroutine hspec(id2,k,nutc0,ntrpdepth,nrxfreq,ntol,bmsk144,bcontest,  &
-     brxequal,btrain,ingain,mycall,hiscall,bshmsg,bswl,datadir,green,s,jh,line1,mygrid)
+     btrain,pcoeffs,ingain,mycall,hiscall,bshmsg,bswl,datadir,green,s,jh,line1, &
+     mygrid)
 
 ! Input:
 !  k         pointer to the most recent new data
@@ -8,7 +9,6 @@ subroutine hspec(id2,k,nutc0,ntrpdepth,nrxfreq,ntol,bmsk144,bcontest,  &
 !  nrxfreq   Rx audio center frequency
 !  ntol      Decoding range is +/- ntol
 !  bmsk144   Boolean, true if in MSK144 mode
-!  brxequal  Boolean, turns on equalization in MSK144 mode
 !  btrain    Boolean, turns on training in MSK144 mode
 !  ingain    Relative gain for spectra
 
@@ -23,10 +23,11 @@ subroutine hspec(id2,k,nutc0,ntrpdepth,nrxfreq,ntol,bmsk144,bcontest,  &
   character*12 mycall,hiscall
   character*6 mygrid
   integer*2 id2(0:120*12000-1)
-  logical*1 bmsk144,bcontest,bshmsg,brxequal,btrain,bswl
+  logical*1 bmsk144,bcontest,bshmsg,btrain,bswl
   real green(0:JZ-1)
   real s(0:63,0:JZ-1)
   real x(512)
+  real pcoeffs(5)
   complex cx(0:256)
   data rms/999.0/,k0/99999999/
   equivalence (x,cx)
@@ -86,7 +87,8 @@ subroutine hspec(id2,k,nutc0,ntrpdepth,nrxfreq,ntol,bmsk144,bcontest,  &
         tt2=sum(float(abs(id2(k0:k0+3583))))
         if(tt1.ne.0.0 .and. tt2.ne.0) then
            call mskrtd(id2(k-7168+1:k),nutc0,tsec,ntol,nrxfreq,ndepth,   &
-                mycall,mygrid,hiscall,bshmsg,bcontest,brxequal,btrain,bswl,datadir,line1)
+                mycall,mygrid,hiscall,bshmsg,bcontest,btrain,pcoeffs,bswl,&
+                datadir,line1)
         endif
      endif
   endif

lib/msk144signalquality.f90

@@ -1,4 +1,4 @@
-  subroutine msk144signalquality(cframe,snr,freq,t0,softbits,msg,dxcall,       &
+subroutine msk144signalquality(cframe,snr,freq,t0,softbits,msg,dxcall,       &
    btrain,datadir,nbiterrors,eyeopening,pcoeffs)
 
   character*22 msg,msgsent
@@ -36,7 +36,7 @@
   real phase(864)
   real twopi,freq,phi,dphi0,dphi1,dphi
   real*8 x(145),y(145),pp(145),sigmay(145),a(5),chisqr
-  real pcoeffs(3)
+  real pcoeffs(5)
 
   data first/.true./
   save cross_avg,wt_avg,first,currently_training,   &
@@ -51,7 +51,6 @@
     trained_dxcall(1:12)=' '
     training_dxcall(1:12)=' '
     currently_training=.false.
-    pcoeffs(1:3)=0.0
     first=.false.
   endif
 
@@ -66,7 +65,6 @@
     currently_training=.false.
     training_dxcall(1:12)=' '
     trained_dxcall(1:12)=' '
-    pcoeffs(1:3)=0.0
 write(*,*) 'reset to untrained state '
   endif
 
@@ -77,14 +75,12 @@ write(*,*) 'reset to untrained state '
     currently_training=.true.
     training_dxcall=trim(dxcall)
     trained_dxcall(1:12)=' '
-    pcoeffs(1:3)=0.0
 write(*,*) 'start training on call ',training_dxcall
   endif
 
   if( msg_has_dxcall .and. currently_training ) then
     trained_dxcall(1:12)=' '
     training_dxcall=dxcall
-    pcoeffs(1:3)=0.0
   endif
 
 ! use decoded message to figure out how many bit errors in the frame 
@@ -193,7 +189,6 @@ write(*,*) 'start training on call ',training_dxcall
       rmsdiff=sum( (pp-phase((864/2-nm/2):(864/2+nm/2)))**2 )/145.0
 write(*,*) 'training ',navg,sqrt(chisqr),rmsdiff
       if( (sqrt(chisqr).lt.1.8) .and. (rmsdiff.lt.0.5) .and. (navg.ge.2) ) then 
-!        pcoeffs=a(3:5)
         trained_dxcall=dxcall
         training_dxcall(1:12)=' '
         currently_training=.false.

lib/mskrtd.f90

@@ -1,5 +1,5 @@
 subroutine mskrtd(id2,nutc0,tsec,ntol,nrxfreq,ndepth,mycall,mygrid,hiscall,   &
-     bshmsg,bcontest,brxequal,btrain,bswl,datadir,line)
+     bshmsg,bcontest,btrain,pcoeffs,bswl,datadir,line)
 
 ! Real-time decoder for MSK144.  
 ! Analysis block size = NZ = 7168 samples, t_block = 0.597333 s 
@@ -37,9 +37,9 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,nrxfreq,ndepth,mycall,mygrid,hiscall,   &
   real pow(8)
   real softbits(144)
   real xmc(NPATTERNS)
-  real pcoeffs(3)
+  real pcoeffs(5)
 
-  logical*1 bshmsg,bcontest,brxequal,btrain,bswl
+  logical*1 bshmsg,bcontest,btrain,bswl
   logical*1 first
   logical*1 bshdecode
   logical*1 seenb4
@@ -53,14 +53,13 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,nrxfreq,ndepth,mycall,mygrid,hiscall,   &
        1,1,1,1,1,0,0,0, &
        1,1,1,1,1,1,1,0/
   data xmc/2.0,4.5,2.5,3.5/     !Used to set time at center of averaging mask
-  save first,tsec0,nutc00,pnoise,cdat,pcoeffs,msglast,msglastswl,     &
+  save first,tsec0,nutc00,pnoise,cdat,msglast,msglastswl,     &
        nsnrlast,nsnrlastswl,recent_calls,nhasharray,recent_shmsgs
 
   if(first) then
      tsec0=tsec
      nutc00=nutc0
      pnoise=-1.0
-     pcoeffs(1:3)=0.0
      do i=1,nrecent
        recent_calls(i)(1:12)=' '
      enddo
@@ -96,7 +95,7 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,nrxfreq,ndepth,mycall,mygrid,hiscall,   &
   fac=1.0/rms
   d(1:NZ)=fac*d(1:NZ)
   d(NZ+1:NFFT1)=0.
-  bvar=brxequal
+  bvar=.true.
   if( btrain ) bvar=.false.   ! if training, turn off rx eq
   call analytic(d,NZ,NFFT1,cdat,pcoeffs,bvar,.false.)  ! never apply dynamic coeffs
 
@@ -191,8 +190,8 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,nrxfreq,ndepth,mycall,mygrid,hiscall,   &
                           btrain,datadir,ncorrected,eyeopening,pcoeffs)
   endif
 
-  decsym=' & '
+  decsym=' ^ '
-  if( brxequal ) decsym=' ^ '
+  if( btrain ) decsym=' & '
   if( msgreceived(1:1).eq.'<') then
     ncorrected=0
     eyeopening=0.0

mainwindow.cpp

@@ -4,6 +4,8 @@
 #include <cinttypes>
 #include <limits>
 #include <functional>
+#include <fstream>
+#include <iterator>
 #include <fftw3.h>
 #include <QLineEdit>
 #include <QRegExpValidator>
@@ -55,6 +57,7 @@
 #include "MultiSettings.hpp"
 #include "MaidenheadLocatorValidator.hpp"
 #include "CallsignValidator.hpp"
+#include "PhaseEqualizationDialog.hpp"
 
 #include "ui_mainwindow.h"
 #include "moc_mainwindow.cpp"
@@ -66,7 +69,7 @@ extern "C" {
                 int* minw, float* px, float s[], float* df3, int* nhsym, int* npts8);
 
   void hspec_(short int d2[], int* k, int* nutc0, int* ntrperiod, int* nrxfreq, int* ntol,
-              bool* bmsk144, bool* bcontest, bool* brxequalize, bool* btrain, int* ingain, 
+              bool* bmsk144, bool* bcontest, bool* btrain, float const pcoeffs[], int* ingain, 
               char mycall[], char hiscall[], bool* bshmsg, bool* bswl, char ddir[], float green[], 
               float s[], int* jh, char line[], char mygrid[],
               int len1, int len2, int len3, int len4, int len5);
@@ -507,6 +510,18 @@ MainWindow::MainWindow(QDir const& temp_directory, bool multiple,
       m_sampleDownloader->show ();
     });
 
+  connect (ui->view_phase_response_action, &QAction::triggered, [this] () {
+      if (!m_phaseEqualizationDialog)
+        {
+          m_phaseEqualizationDialog.reset (new PhaseEqualizationDialog {m_settings, m_dataDir, m_phaseEqCoefficients, this});
+          connect (m_phaseEqualizationDialog.data (), &PhaseEqualizationDialog::phase_equalization_changed,
+                   [this] (QVector<float> const& coeffs) {
+                     m_phaseEqCoefficients = coeffs;
+                   });
+        }
+      m_phaseEqualizationDialog->show ();
+    });
+
   QButtonGroup* txMsgButtonGroup = new QButtonGroup {this};
   txMsgButtonGroup->addButton(ui->txrb1,1);
   txMsgButtonGroup->addButton(ui->txrb2,2);
@@ -967,8 +982,15 @@ void MainWindow::writeSettings()
   m_settings->setValue ("CQTxfreq", ui->sbCQTxFreq->value ());
   m_settings->setValue("pwrBandTxMemory",m_pwrBandTxMemory);
   m_settings->setValue("pwrBandTuneMemory",m_pwrBandTuneMemory);
+  {
+    QList<QVariant> coeffs;     // suitable for QSettings
+    for (auto const& coeff : m_phaseEqCoefficients)
+      {
+        coeffs << static_cast<double> (coeff);
+      }
+    m_settings->setValue ("PhaseEqualizationCoefficients", QVariant {coeffs});
+  }
   m_settings->endGroup();
-
 }
 
 //---------------------------------------------------------- readSettings()
@@ -1042,6 +1064,15 @@ void MainWindow::readSettings()
   m_TRindex=m_settings->value("TRindex",4).toInt();
   m_pwrBandTxMemory=m_settings->value("pwrBandTxMemory").toHash();
   m_pwrBandTuneMemory=m_settings->value("pwrBandTuneMemory").toHash();
+  {
+    auto const& coeffs = m_settings->value ("PhaseEqualizationCoefficients"
+                                            , QList<QVariant> {0., 0., 0., 0., 0.}).toList ();
+    m_phaseEqCoefficients.clear ();
+    for (auto const& coeff : coeffs)
+      {
+        m_phaseEqCoefficients.append (coeff.value<double> ());
+      }
+  }
   m_settings->endGroup();
 
   // use these initialisation settings to tune the audio o/p buffer
@@ -1345,7 +1376,6 @@ void MainWindow::fastSink(qint64 frames)
   QString hisCall {ui->dxCallEntry->text ()};
   bool bshmsg=ui->cbShMsgs->isChecked();
   bool bcontest=m_config.contestMode();
-  bool brxequalize=m_config.rxEqualize();
   bool bswl=ui->cbSWL->isChecked();
   strncpy(dec_data.params.hiscall,(hisCall + "            ").toLatin1 ().constData (), 12);
   strncpy(dec_data.params.mygrid, (m_config.my_grid()+"      ").toLatin1(),6);
@@ -1353,9 +1383,11 @@ void MainWindow::fastSink(qint64 frames)
   dataDir = m_dataDir.absolutePath ();
   char ddir[512];
   strncpy(ddir,dataDir.toLatin1(), sizeof (ddir) - 1);
-  hspec_(dec_data.d2,&k,&nutc0,&nTRpDepth,&RxFreq,&m_Ftol,&bmsk144,&bcontest,&brxequalize,
+  hspec_(dec_data.d2,&k,&nutc0,&nTRpDepth,&RxFreq,&m_Ftol,&bmsk144,&bcontest,
-   &m_bTrain,&m_inGain,&dec_data.params.mycall[0],&dec_data.params.hiscall[0],&bshmsg,&bswl,
+         &m_bTrain,m_phaseEqCoefficients.constData(),&m_inGain,&dec_data.params.mycall[0],
-   &ddir[0],fast_green,fast_s,&fast_jh,&line[0],&dec_data.params.mygrid[0],12,12,512,80,6);
+         &dec_data.params.hiscall[0],&bshmsg,&bswl,
+         &ddir[0],fast_green,fast_s,&fast_jh,&line[0],&dec_data.params.mygrid[0],
+         12,12,512,80,6);
   float px = fast_green[fast_jh];
   QString t;
   t.sprintf(" Rx noise: %5.1f ",px);

mainwindow.h

@@ -18,6 +18,7 @@
 #include <QHostAddress>
 #include <QPointer>
 #include <QSet>
+#include <QVector>
 #include <QFuture>
 #include <QFutureWatcher>
 
@@ -78,6 +79,7 @@ class SoundInput;
 class Detector;
 class SampleDownloader;
 class MultiSettings;
+class PhaseEqualizationDialog;
 
 class MainWindow : public QMainWindow
 {
@@ -306,6 +308,7 @@ private:
   bool m_WSPR_tx_next;
   MessageBox m_rigErrorMessageBox;
   QScopedPointer<SampleDownloader> m_sampleDownloader;
+  QScopedPointer<PhaseEqualizationDialog> m_phaseEqualizationDialog;
 
   QScopedPointer<WideGraph> m_wideGraph;
   QScopedPointer<EchoGraph> m_echoGraph;
@@ -539,6 +542,8 @@ private:
   QHash<QString, QVariant> m_pwrBandTxMemory; // Remembers power level by band
   QHash<QString, QVariant> m_pwrBandTuneMemory; // Remembers power level by band for tuning
   QByteArray m_geometryNoControls;
+  QVector<float> m_phaseEqCoefficients;
+
   //---------------------------------------------------- private functions
   void readSettings();
   void setDecodedTextFont (QFont const&);

mainwindow.ui

@@ -992,15 +992,15 @@ QLabel[oob="true"] {
                    <property name="enabled">
                     <bool>true</bool>
                    </property>
-                   <property name="toolTip">
-                    <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Check to monitor Sh messages.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
-                   </property>
                    <property name="maximumSize">
                     <size>
                      <width>16777215</width>
                      <height>16777215</height>
                     </size>
                    </property>
+                   <property name="toolTip">
+                    <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Check to monitor Sh messages.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+                   </property>
                    <property name="text">
                     <string>SWL</string>
                    </property>
@@ -2449,7 +2449,9 @@ QPushButton[state=&quot;ok&quot;] {
     </property>
     <addaction name="actionErase_reference_spectrum"/>
     <addaction name="actionMeasure_reference_spectrum"/>
+    <addaction name="separator"/>
     <addaction name="actionMeasure_phase_response"/>
+    <addaction name="view_phase_response_action"/>
     <addaction name="separator"/>
     <addaction name="actionFrequency_calibration"/>
    </widget>
@@ -2970,6 +2972,11 @@ QPushButton[state=&quot;ok&quot;] {
     <string>Execute frequency calibration cycle</string>
    </property>
   </action>
+  <action name="view_phase_response_action">
+   <property name="text">
+    <string>View phase response ...</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <customwidgets>

qcustomplot-source/GPL.txt

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
+
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under section
+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged.  This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+
+    d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+  A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit.  Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+  6. Conveying Non-Source Forms.
+
+  You may convey a covered work in object code form under the terms
+of sections 4 and 5, provided that you also convey the
+machine-readable Corresponding Source under the terms of this License,
+in one of these ways:
+
+    a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+
+    b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the
+    Corresponding Source from a network server at no charge.
+
+    c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source.  This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+
+    d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge.  You need not require recipients to copy the
+    Corresponding Source along with the object code.  If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source.  Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+
+    e) Convey the object code using peer-to-peer transmission, provided
+    you inform other peers where the object code and Corresponding
+    Source of the work are being offered to the general public at no
+    charge under subsection 6d.
+
+  A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+  A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal, family,
+or household purposes, or (2) anything designed or sold for incorporation
+into a dwelling.  In determining whether a product is a consumer product,
+doubtful cases shall be resolved in favor of coverage.  For a particular
+product received by a particular user, "normally used" refers to a
+typical or common use of that class of product, regardless of the status
+of the particular user or of the way in which the particular user
+actually uses, or expects or is expected to use, the product.  A product
+is a consumer product regardless of whether the product has substantial
+commercial, industrial or non-consumer uses, unless such uses represent
+the only significant mode of use of the product.
+
+  "Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to install
+and execute modified versions of a covered work in that User Product from
+a modified version of its Corresponding Source.  The information must
+suffice to ensure that the continued functioning of the modified object
+code is in no case prevented or interfered with solely because
+modification has been made.
+
+  If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information.  But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+  The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or updates
+for a work that has been modified or installed by the recipient, or for
+the User Product in which it has been modified or installed.  Access to a
+network may be denied when the modification itself materially and
+adversely affects the operation of the network or violates the rules and
+protocols for communication across the network.
+
+  Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.)  You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+
+    d) Limiting the use for publicity purposes of names of licensors or
+    authors of the material; or
+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

qcustomplot-source/changelog.txt

@@ -0,0 +1,533 @@
+#### Version 2.0.0-beta released on 13.09.16 ####
+
+Added major features:
+  - Axis tick and tick label generation was completely refactored and is now handled in the QCPAxisTicker class (also see QCPAxis::setTicker). Available ticker subclasses for special uses cases:
+    QCPAxisTicker, QCPAxisTickerFixed, QCPAxisTickerLog, QCPAxisTickerPi, QCPAxisTickerTime, QCPAxisTickerDateTime, QCPAxisTickerText
+  - Data container is now based on QCPDataContainer template for unified data interface and significantly improved memory footprint and better performance for common use-cases, especially data adding/removing.
+  - New data selection mechanism allows selection of single data points and data ranges for plottables. See special documentation page "data selection mechanism".
+  - Rubber band/selection rect for data point selection and axis zooming is now available, see documentation of QCustomPlot::setSelectionRectMode and QCPSelectionRect. For this purpose, the new default
+    layer "overlay" was introduced, which is now the top layer, and holds the QCustomPlot's QCPSelectionRect instance.
+  - Data sharing between plottables of the same type (see setData methods taking a QSharedPointer)
+  - OpenGL hardware acceleration is now available across all Qt versions (including Qt4) in a unified, simple interface, with QCustomPlot::setOpenGl
+  - QCPStatisticalBox can now display a series of statistical boxes instead of only a single one
+  - New QCPErrorBars plottable allows attaching error bars to any one-dimensional plottable (QCPGraph has thus lost its own error-bar capability)
+  - QCPColorMap now supports transparency via alpha in its color gradient stops, and via a dedicated cell-wise alpha map (see QCPColorMapData::setAlpha)
+  - Layers may now be individually replotted (QCPLayer::replot), if the mode (QCPLayer::setMode) is set to lmBuffered. Mutually adjacent lmLogical layers share a single paint buffer to save resources.
+    By default, the new topmost "overlay" layer which contains the selection rect is an lmBuffered layer. Updating the selection rect is thus very fast, independent of the plot contents.
+  - QCPLayerable (and thus practically all objects in QCP) now have virtual methods to receive mouse press/move/release/doubleclick/wheel events. Before, only QCPLayoutElement provided them.
+    this makes it much easier to subclass e.g. items and plottables to provide custom mouse interactions that were cumbersome and awkward with the simpler signal-based interface
+  
+Added minor features:
+  - High-DPI support for Qt versions 5.0 and up, using device pixel ratio detected by Qt (can be changed manually via QCustomPlot::setBufferDevicePixelRatio).
+  - QCPGraph and QCPCurve can now be configured to only display every n'th scatter symbol, see ::setScatterSkip() method
+  - QCPFinancial allows to define bar width in absolute pixels and axis rect ratio, instead of only in plot key coordinates (see QCPFinancial::setWidthType)
+  - Range dragging/zooming can now be configured to affect more than one axis per orientation (see new overloads of QCPAxisRect::setRangeDragAxes/setRangeZoomAxes)
+  - Added QCPTextElement (replaces QCPPlotTitle) for general texts in layouts. Provides clicked and doubleClicked signals, as replacement for the removed QCustomPlot::titleClicked/titleDoubleClicked
+  - Export functions (QCustomPlot::savePng etc.) now support specifying the resolution that will be written to the image file header. This improves operability with other tools which respect metadata.
+  - Replots can now be queued to the next event loop iteration with replot(QCP::rpQueuedReplot). This way you can successively ask for a replot at multiple code locations without causing redundant replots
+  - QCPAxisRect::zoom(...) allows to zoom to a specific rectangular region given in pixel coordinates, either affecting all axes or a specified subset of axes.
+  - QCPRange::bounded returns a bounded range, trying to preserve its size. Works with rangeChanged signal to limit the allowed range (see rangeChanged doc)
+  - Plottable rescaleValueAxis method (and getValueRange) now take parameter inKeyRange, which allows rescaling of the value axis only with respect to data in the currently visible key range
+  - plottableClick and plottableDoubleClick signals now carry the clicked data point index as second parameter
+  - Added QCPAxis::scaleRange overload without "center" argument, which scales around the current axis range center
+  - Added QCPRange::expand/expanded overloads which take only one double parameter
+  - Plottables addToLegend/removeFromLegend methods now have overloads that take any QCPLegend, to make working with non-default legends easier (legends that are not QCustomPlot::legend)
+  - Added QCPStatisticalBox::setWhiskerAntialiased to allow controlling antialiasing state of whiskers independently of quartile box/median line
+  - The virtual method QCPLayoutElement::layoutChanged() now allows subclasses to react on a move of the layout element between logical positions in the parent layout, or between layouts
+  - QCPMarginGroup::commonMargin is now virtual, to facilitate subclassing of QCPMarginGroup
+  - QCPGraph::getPreparedData is now virtual, and thus allows subclasses to easily generate own plotted data, e.g. on-the-fly.
+  - Added QCPRange qDebug stream operator
+  - QCPLayoutGrid (and thus QCPLegend) can now wrap rows or columns at specified row/column counts, see setFillOrder, setWrap and the new addElement overload which doesn't have row/column index
+  
+Bugfixes [Also backported to 1.3.2]:
+  - Fixed possible crash when having a QCPGraph with scatters only and a non-transparent main/fill brush of the graph
+  - Fixed QCPItemPixmap not updating internally cached scaled pixmap if new pixmap set with same scaled dimensions
+  - When using log axis scale and zooming out as far as possible (~1e-280..1e280), axis doesn't end up in (via mouse) unrecoverable range with strange axis ticks anymore
+  - Axis tick label algorithm for beautifully typeset powers now checks whether "e" in tick label is actually part of a number before converting the exponent to superscript
+  - Fixed QCustomPlot::moveLayer performing incorrect move and possible crash in certain situations
+  - Fixed possible crash on QCustomPlot destruction due to wrong QObject-hierarchy. Only occurs if a QCPAxisRect is removed from the normal QCustomPlot destruction hierarchy by taking it out of its layout
+  - Fixed possible freeze when data values become infinity after coord-to-pixel transformation (e.g. maximally zoomed out log axis), and line style is not solid (e.g. dashed) or phFastPolylines is disabled
+  - Fixed a few missing enums in meta type system, by unifying usage of Q_ENUMS, Q_FLAGS and Q_DECLARE_METATYPE
+Bugfixes [Not in 1.3.2]:
+  - Fixed QCPItemLine/QCPItemStraightLine not being selectable when defining coords are many orders of magnitude (>1e8) larger than currently viewed range
+  - Fixed/worked around crash due to bug in QPainter::drawPixmap with very large negative x/y pixel coordinates, when drawing sparse pixmap scatters
+  - Fixed possible (but unlikely) int overflow in adaptive sampling algorithm, that could cause plot artifacts when using extremely sparse data (with respect to current key axis range).
+  - Fixed QCPBarsGroup bug which caused stPlotCoords spacing to be wrong with vertical key axes
+  - A QCPBars axis rescale in the main window constructor (i.e. without well-defined plot size) now falls back to a datapoint-tight rescaling instead of doing nothing (because bar width can't be determined)
+  - Improved QCPBars stacking when using bars with very large keys and key separation at limit of double precision
+  
+Summary of backward incompatible changes:
+  Plottable related:
+  - Removed QCustomPlot::addPlottable, not needed anymore as plottables now automatically register in their constructor
+  - Removed QCustomPlot::addItem, not needed anymore as items now automatically register in their constructor
+  - QCPAbstractPlottable::addToLegend/removeFromLegend are not virtual anymore. If your plottable requires a custom legend item, add it to the legend manually.
+  - setData/addData method overloads of plottables have changed to facilitate data sharing and new data container (see documentation)
+  - plottableClick and plottableDoubleClick signals now carry the clicked data point index as second parameter, and the QMouseEvent parameter has moved to third.
+    Check all your usages of those signals, because Qt's connect method only reports problems during runtime!
+  - setSelectable now not only limits what can be selected by the user, but limits also any programmatic selection changes via setSelected.
+  - enum QCPAbstractPlottable::SignDomain has changed namespace to QCP::SignDomain
+  Axis related:
+  - Removed QCPAxis::setAutoTicks, setAutoTickCount, setAutoTickLabels, setAutoTickStep, setAutoSubTicks, setTickLabelType, setDateTimeFormat, setDateTimeSpec,
+    setTickStep, setTickVector, setTickVectorLabels, setSubTickCount in favor of new QCPAxisTicker-based interface
+  - Added QCPAxis::setSubTicks to enable/disable subticks (manually controlling the subtick count needs subclassing of QCPAxisTicker, e.g. QCPAxisTickerText and QCPAxisTickerLog provide setSubTickCount)
+  Item related:
+  - Renamed QCPAbstractItem::rectSelectTest to rectDistance, to prevent confusion with new QCPAbstractPlottable1D::selectTestRect
+  - Renamed QCPItemAnchor::pixelPoint to QCPItemAnchor::pixelPosition (also affects subclass QCPItemPosition)
+  General:
+  - Renamed QCustomPlot::RefreshPriority enums (parameter of the replot() method): rpImmediate to rpImmediateRefresh, rpQueued to rpQueuedRefresh, rpHint to rpRefreshHint
+  - Renamed QCustomPlot::PlottingHint enum phForceRepaint to phImmediateRefresh
+  - Removed QCPPlotTitle layout element (See new QCPTextElement for almost drop-in replacement)
+  - Removed signals QCustomPlot::titleClicked/titleDoubleClicked, replaced by QCPTextElement signals clicked/doubleClicked.
+  - QCustomPlot::savePdf has changed parameters from (fileName, bool noCosmeticPen, width, height,...) to (fileName, width, height, QCP::ExportPen exportPen,...)
+  - Virtual methods QCPLayoutElement::mouseMoveEvent/mouseReleaseEvent (which are now introduced already in the superclass QCPLayerable) have gained an additional parameter const QPointF &startPos.
+    If you have reimplemented these methods, make sure to update your function signatures, otherwise your reimplementations will likely be ignored by the compiler without warning
+  - Creating a new QCPColorGradient without supplying a preset parameter in the constructor now creates an empty gradient, instead of loading the gpCold preset
+  
+Other:
+  - Replaced usage of Qt's QVector2D with own QCPVector2D which uses double precision and offers some convenience functions
+  - Extended relative range to which QCPItemLine/QCPItemStraightLine can be zoomed before vanishing from ~1e9 to ~1e16
+  - Removed QCPItemStraightLine::distToStraightLine (replaced by QCPVector2D::distanceToStraightLine)
+  - Removed QCPAbstractPlottable::distSqrToLine and QCPAbstractItem::distSqrToLine (replaced by QCPVector2D::distanceSquaredToLine)
+  - Qt5.5 compatibility (If you use PDF export, test your outputs, as output dimensions might change when switching Qt versions -- QCP does not try to emulate previous Qt version behaviour here)
+  - QCP now includes <QtPrintSupport/QtPrintSupport> instead of just <QtPrintSupport> because some users had problems with the latter. Please report if you now experience issues due to the new include.
+  - QCPGraph can now use a brush (filled polygon under the graph data) without having a graph line (line style lsNone)
+  - QCPFinancial is now two-colored (setTwoColored(true)) by default, and has green/red as default two-colored brushes and pens
+  - Plottable pixelsToCoords/coordsToPixels methods are now public, and offer transformations from pixel to plot coordinates and vice versa, using the plottable's axes
+  - Plottable getKeyRange/getValueRange methods are now public
+  - QCPBarsGroup now always places the QCPBars that was added to the group first towards lower keys, independent of axis orientation or direction (the ordering used to flip with axis orientation)
+  - Default focus policy for QCustomPlot is now Qt::ClickFocus, instead of Qt::NoFocus.
+  - tweaked QCPLegend and QCPAbstractLegendItem margins: The items have by default zero own margins, and QCPLegend row- and column spacing was increased to compensate. Legend was made slightly denser by default.
+  - Used doxygen version is now 1.8.12, and documentation/postprocessing-scripts were adapted accordingly. Expect minor issues and some warnings when using older doxygen.
+
+#### Version 1.3.2 released on 22.12.15 ####
+
+  Bugfixes [Backported from 2.0.0 branch]:
+    - Fixed possible crash when having a QCPGraph with scatters only and a non-transparent main/fill brush of the graph
+    - Fixed QCPItemPixmap not updating internally cached scaled pixmap if new pixmap set with same scaled dimensions
+    - When using log axis scale and zooming out as far as possible (~1e-280..1e280), axis doesn't end up in (via mouse) unrecoverable range with strange axis ticks anymore
+    - Axis tick label algorithm for beautifully typeset powers now checks whether "e" in tick label is actually part of a number before converting the exponent to superscript
+    - Fixed QCustomPlot::moveLayer performing incorrect move and possible crash in certain situations
+    - Fixed possible crash on QCustomPlot destruction due to wrong QObject-hierarchy. Only occurs if a QCPAxisRect is removed from the normal QCustomPlot destruction hierarchy by taking it out of its layout
+    - Fixed possible freeze when data values become infinity after coord-to-pixel transformation (e.g. maximally zoomed out log axis), and line style is not solid (e.g. dashed) or phFastPolylines is disabled
+    
+  Other [Backported from 2.0.0 branch]:
+    - A few documentation fixes/improvements
+    - Qt5.5 compatibility (If you use PDF export, test your outputs, as output dimensions might change when switching Qt versions -- QCP does not try to emulate previous Qt version behaviour here)
+    - QCP now includes <QtPrintSupport/QtPrintSupport> instead of just <QtPrintSupport> because some users had problems with the latter. Please report if you now experience issues due to the new include.
+
+#### Version 1.3.1 released on 25.04.15 ####
+
+  Bugfixes:
+    - Fixed bug that prevented automatic axis rescaling when some graphs/curves had only NaN data points
+    - Improved QCPItemBracket selection boundaries, especially bsCurly and bsCalligraphic
+    - Fixed bug of axis rect and colorscale background shifted downward by one logical pixel (visible in scaled png and pdf export)
+    - Replot upon mouse release is now only performed if a selection change has actually happened (improves responsivity on particularly complex plots)
+    - Fixed bug that allowed scatter-only graphs to be selected by clicking the non-existent line between scatters
+    - Fixed crash when trying to select a scatter-only QCPGraph whose only points in the visible key range are at identical key coordinates and vertically off-screen, with adaptive sampling enabled
+    - Fixed pdf export of QCPColorMap with enabled interpolation (didn't appear interpolated in pdf)
+    - Reduced QCPColorMap jitter of internal cell boundaries for small sized maps when viewed with high zoom, by applying oversampling factors dependant on map size
+    - Fixed bug of QCPColorMap::fill() not causing the buffered internal image map to be updated, and thus the change didn't become visible immediately
+    - Axis labels with size set in pixels (setPixelSize) instead of points now correctly calculate the exponent's font size if beautifully typeset powers are enabled
+    - Fixed QCPColorMap appearing at the wrong position for logarithmic axes and color map spanning larger ranges
+    
+  Other:
+    - Pdf export used to embed entire QCPColorMaps, potentially leading to large files. Now only the visible portion of the map is embedded in the pdf
+    - Many documentation fixes and extensions, style modernization
+    - Reduced documentation file size (and thus full package size) by automatically reducing image palettes during package build
+    - Fixed MSVC warning message (at warning level 4) due to temporary QLists in some foreach statements
+
+#### Version 1.3.0 released on 27.12.14 ####
+
+  Added features:
+    - New plottable class QCPFinancial allows display of candlestick/ohlc data
+    - New class QCPBarsGroup allows horizontal grouping of multiple QCPBars plottables
+    - Added QCPBars feature allowing non-zero base values (see property QCPBars::setBaseValue)
+    - Added QCPBars width type, for more flexible bar widths (see property QCPBars::setWidthType)
+    - New QCPCurve optimization algorithm, fixes bug which caused line flicker at deep zoom into curve segment
+    - Item positions can now have different position types and anchors for their x and y coordinates (QCPItemPosition::setTypeX/Y, setParentAnchorX/Y)
+    - QCPGraph and QCPCurve can now display gaps in their lines, when inserting quiet NaNs as values (std::numeric_limits<double>::quiet_NaN())
+    - QCPAxis now supports placing the tick labels inside the axis rect, for particularly space saving plots (QCPAxis::setTickLabelSide)
+  Added features after beta:
+    - Made code compatible with QT_NO_CAST_FROM_ASCII, QT_NO_CAST_TO_ASCII
+    - Added compatibility with QT_NO_KEYWORDS after sending code files through a simple reg-ex script
+    - Added possibility to inject own QCPAxis(-subclasses) via second, optional QCPAxisRect::addAxis parameter
+    - Added parameter to QCPItemPixmap::setScaled to specify transformation mode
+  
+  Bugfixes:
+    - Fixed bug in QCPCurve rendering of very zoomed-in curves (via new optimization algorithm)
+    - Fixed conflict with MSVC-specific keyword "interface" in text-document-integration example
+    - Fixed QCPScatterStyle bug ignoring the specified pen in the custom scatter shape constructor
+    - Fixed bug (possible crash) during QCustomPlot teardown, when a QCPLegend that has no parent layout (i.e. was removed from layout manually) gets deleted
+  Bugfixes after beta:
+    - Fixed bug of QCPColorMap/QCPColorGradient colors being off by one color sampling step (only noticeable in special cases)
+    - Fixed bug of QCPGraph adaptive sampling on vertical key axis, causing staggered look
+    - Fixed low (float) precision in QCPCurve optimization algorithm, by not using QVector2D anymore
+  
+  Other:
+    - Qt 5.3 and Qt 5.4 compatibility
+
+#### Version 1.2.1 released on 07.04.14 ####
+
+  Bugfixes:
+    - Fixed regression which garbled date-time tick labels on axes, if setTickLabelType is ltDateTime and setNumberFormat contains the "b" option
+
+#### Version 1.2.0 released on 14.03.14 ####
+
+  Added features:
+    - Adaptive Sampling for QCPGraph greatly improves performance for high data densities (see QCPGraph::setAdaptiveSampling)
+    - QCPColorMap plottable with QCPColorScale layout element allows plotting of 2D color maps
+    - QCustomPlot::savePdf now has additional optional parameters pdfCreator and pdfTitle to set according PDF metadata fields
+    - QCustomPlot::replot now allows specifying whether the widget update is immediate (repaint) or queued (update)
+    - QCPRange operators +, -, *, / with double operand for range shifting and scaling, and ==, != for range comparison
+    - Layers now have a visibility property (QCPLayer::setVisible)
+    - static functions QCPAxis::opposite and QCPAxis::orientation now offer more convenience when handling axis types
+    - added notification signals for selectability change (selectableChanged) on all objects that have a selected/selectable property
+    - added notification signal for QCPAxis scaleType property
+    - added notification signal QCPLayerable::layerChanged
+  
+  Bugfixes:
+    - Fixed assert halt, when QCPAxis auto tick labels not disabled but nevertheless a custom non-number tick label ending in "e" given
+    - Fixed painting glitches when QCustomPlot resized inside a QMdiArea or under certain conditions inside a QLayout
+    - If changing QCPAxis::scaleType and thus causing range sanitizing and a range modification, rangeChanged wouldn't be emitted
+    - Fixed documentation bug that caused indentation to be lost in code examples
+  Bugfixes after beta:
+    - Fixed bug that caused crash if clicked-on legend item is removed in mousePressEvent.
+    - On some systems, font size defaults to -1, which used to cause a debug output in QCPAxisPainterPrivate::TickLabelDataQCP. Now it's checked before setting values based on the default font size.
+    - When using multiple axes on one side, setting one to invisible didn't properly compress the freed space.
+    - Fixed bug that allowed selection of plottables when clicking in the bottom or top margin of a QCPAxisRect (outside the inner rect)
+    
+  Other:
+    - In method QCPAbstractPlottable::getKeyRange/getValueRange, renamed parameter "validRange" to "foundRange", to better reflect its meaning (and contrast it from QCPRange::validRange)
+    - QCPAxis low-level axis painting methods exported to QCPAxisPainterPrivate
+
+#### Version 1.1.1 released on 09.12.13 ####
+
+  Bugfixes:
+    - Fixed bug causing legends blocking input events from reaching underlying axis rect even if legend is invisible
+    - Added missing Q_PROPERTY for QCPAxis::setDateTimeSpec
+    - Fixed behaviour of QCPAxisRect::setupFullAxesBox (now transfers more properties from bottom/left to top/right axes and sets visibility of bottom/left axes to true)
+    - Made sure PDF export doesn't default to grayscale output on some systems
+  
+  Other:
+    - Plotting hint QCP::phForceRepaint is now enabled on all systems (and not only on windows) by default
+    - Documentation improvements
+
+#### Version 1.1.0 released on 04.11.13 ####
+
+  Added features:
+    - Added QCPRange::expand and QCPRange::expanded
+    - Added QCPAxis::rescale to rescale axis to all associated plottables
+    - Added QCPAxis::setDateTimeSpec/dateTimeSpec to allow axis labels either in UTC or local time
+    - QCPAxis now additionally emits a rangeChanged signal overload that provides the old range as second parameter
+    
+  Bugfixes:
+    - Fixed QCustomPlot::rescaleAxes not rescaling properly if first plottable has an empty range
+    - QCPGraph::rescaleAxes/rescaleKeyAxis/rescaleValueAxis are no longer virtual (never were in base class, was a mistake)
+    - Fixed bugs in QCPAxis::items and QCPAxisRect::items not properly returning associated items and potentially stalling
+    
+  Other:
+    - Internal change from QWeakPointer to QPointer, thus got rid of deprecated Qt functionality
+    - Qt5.1 and Qt5.2 (beta1) compatibility
+    - Release packages now extract to single subdirectory and don't place multiple files in current working directory
+
+#### Version 1.0.1 released on 05.09.13 ####
+
+  Bugfixes:
+    - using define flag QCUSTOMPLOT_CHECK_DATA caused debug output when data was correct, instead of invalid (fixed QCP::isInvalidData)
+    - documentation images are now properly shown when viewed with Qt Assistant
+    - fixed various documentation mistakes
+    
+  Other:
+    - Adapted documentation style sheet to better match Qt5 documentation
+
+#### Version 1.0.0 released on 01.08.13 ####
+
+  Quick Summary:
+    - Layout system for multiple axis rects in one plot
+    - Multiple axes per side
+    - Qt5 compatibility
+    - More flexible and consistent scatter configuration with QCPScatterStyle
+    - Various interface cleanups/refactoring
+    - Pixmap-cached axis labels for improved replot performance
+
+  Changes that break backward compatibility:
+    - QCustomPlot::axisRect() changed meaning due to the extensive changes to how axes and axis rects are handled
+      it now returns a pointer to a QCPAxisRect and takes an integer index as parameter.
+    - QCPAxis constructor changed to now take QCPAxisRect* as parent
+    - setAutoMargin, setMarginLeft/Right/Top/Bottom removed due to the axis rect changes (see QCPAxisRect::setMargins/setAutoMargins)
+    - setAxisRect removed due to the axis rect changes
+    - setAxisBackground(-Scaled/-ScaledMode) now moved to QCPAxisRect as setBackground(-Scaled/ScaledMode) (access via QCustomPlot::axisRects())
+    - QCPLegend now is a QCPLayoutElement
+    - QCPAbstractPlottable::drawLegendIcon parameter "rect" changed from QRect to QRectF
+    - QCPAbstractLegendItem::draw second parameter removed (position/size now handled via QCPLayoutElement base class)
+    - removed QCPLegend::setMargin/setMarginLeft/Right/Top/Bottom (now inherits the capability from QCPLayoutElement::setMargins)
+    - removed QCPLegend::setMinimumSize (now inherits the capability from QCPLayoutElement::setMinimumSize)
+    - removed enum QCPLegend::PositionStyle, QCPLegend::positionStyle/setPositionStyle/position/setPosition (replaced by capabilities of QCPLayoutInset)
+    - QCPLegend transformed to work with new layout system (almost everything changed)
+    - removed entire title interface: QCustomPlot::setTitle/setTitleFont/setTitleColor/setTitleSelected/setTitleSelectedFont/setTitleSelectedColor and
+      the QCustomPlot::iSelectTitle interaction flag (all functionality is now given by the layout element "QCPPlotTitle" which can be added to the plot layout)
+    - selectTest functions now take two additional parameters: bool onlySelectable and QVariant *details=0
+    - selectTest functions now ignores visibility of objects and (if parameter onlySelectable is true) does not anymore ignore selectability of the object
+    - moved QCustomPlot::Interaction/Interactions to QCP namespace as QCP::Interaction/Interactions
+    - moved QCustomPlot::setupFullAxesBox() to QCPAxisRect::setupFullAxesBox. Now also accepts parameter to decide whether to connect opposite axis ranges
+    - moved range dragging/zooming interface from QCustomPlot to QCPAxisRect (setRangeDrag, setRangeZoom, setRangeDragAxes, setRangeZoomAxes,...)
+    - rangeDrag/Zoom is now set to Qt::Horizontal|Qt::Vertical instead of 0 by default, on the other hand, iRangeDrag/Zoom is unset in interactions by
+      default (this makes enabling dragging/zooming easier by just adding the interaction flags)
+    - QCPScatterStyle takes over everything related to handling scatters in all plottables
+    - removed setScatterPen/Size on QCPGraph and QCPCurve, removed setOutlierPen/Size on QCPStatisticalBox (now handled via QCPScatterStyle)
+    - modified setScatterStyle on QCPGraph and QCPCurve, and setOutlierStyle on QCPStatisticalBox, to take QCPScatterStyle
+    - axis grid and subgrid are now reachable via the QCPGrid *QCPAxis::grid() method. (e.g. instead of xAxis->setGrid(true), write xAxis->grid()->setVisible(true))
+
+  Added features:
+    - Axis tick labels are now pixmap-cached, thus increasing replot performance (in usual setups by about 24%). See plotting hint phCacheLabels which is set by default
+    - Advanced layout system, including the classes QCPLayoutElement, QCPLayout, QCPLayoutGrid, QCPLayoutInset, QCPAxisRect
+    - QCustomPlot::axisRects() returns all the axis rects in the QCustomPlot.
+    - QCustomPlot::plotLayout() returns the top level layout (initially a QCPLayoutGrid with one QCPAxisRect inside)
+    - QCPAxis now may have an offset to the axis rect (setOffset)
+    - Multiple axes per QCPAxisRect side are now supported (see QCPAxisRect::addAxis)
+    - QCustomPlot::toPixmap renders the plot into a pixmap and returns it
+    - When setting tick label rotation to +90 or -90 degrees on a vertical axis, the labels are now centered vertically on the tick height
+      (This allows space saving vertical tick labels by having the text direction parallel to the axis)
+    - Substantially increased replot performance when using very large manual tick vectors (> 10000 ticks) via QCPAxis::setTickVector
+    - QCPAxis and QCPAxisRect now allow easy access to all plottables(), graphs() and items() that are associated with them
+    - Added QCustomPlot::hasItem method for consistency with plottable interface, hasPlottable
+    - Added QCPAxisRect::setMinimumMargins as replacement for hardcoded minimum axis margin (15 px) when auto margin is enabled
+    - Added Flags type QCPAxis::AxisTypes (from QCPAxis::AxisType), used in QCPAxisRect interface
+    - Automatic margin calculation can now be enabled/disabled on a per-side basis, see QCPAxisRect::setAutoMargins
+    - QCPAxisRect margins of multiple axis rects can be coupled via QCPMarginGroup
+    - Added new default layers "background" and "legend" (QCPAxisRect draws its background on the "background" layer, QCPLegend is on the "legend" layer by default)
+    - Custom scatter style via QCP::ssCustom and respective setCustomScatter functions that take a QPainterPath
+    - Filled scatters via QCPScatterStyle::setBrush
+  Added features after beta:
+    - Added QCustomPlot::toPainter method, to allow rendering with existing painter
+    - QCPItemEllipse now provides a center anchor
+
+  Bugfixes:
+    - Fixed compile error on ARM
+    - Wrong legend icons were displayed if using pixmaps for scatters that are smaller than the legend icon rect
+    - Fixed clipping inaccuracy for rotated tick labels (were hidden too early, because the non-rotated bounding box was used)
+    - Fixed bug that caused wrong clipping of axis ticks and subticks when the ticks were given manually by QCPAxis::setTickVector
+    - Fixed Qt5 crash when dragging graph out of view (iterator out of bounds in QCPGraph::getVisibleDataBounds)
+    - Fixed QCPItemText not scaling properly when using scaled raster export
+  Bugfixes after beta:
+    - Fixed bug that clipped the rightmost pixel column of tick labels when caching activated (only visible on windows for superscript exponents)
+    - Restored compatibility to Qt4.6
+    - Restored support for -no-RTTI compilation
+    - Empty manual tick labels are handled more gracefully (no QPainter qDebug messages anymore)
+    - Fixed type ambiguity in QCPLineEnding::draw causing compile error on ARM
+    - Fixed bug of grid layouts not propagating the minimum size from their child elements to the parent layout correctly
+    - Fixed bug of child elements (e.g. axis rects) of inset layouts not properly receiving mouse events
+
+  Other:
+    - Opened up non-amalgamated project structure to public via git repository
+
+#### Version released on 09.06.12 ####
+
+  Quick Summary:
+    - Items (arrows, text,...)
+    - Layers (easier control over rendering order)
+    - New antialiasing system (Each objects controls own antialiasing with setAntialiased)
+    - Performance Improvements
+    - improved pixel-precise drawing
+    - easier shared library creation/usage
+
+  Changes that (might) break backward compatibility:
+    - enum QCPGraph::ScatterSymbol was moved to QCP namespace (now QCP::ScatterSymbol).
+      This replace should fix your code: "QCPGraph::ss" -> "QCP::ss"
+    - enum QCustomPlot::AntialiasedElement and flag QCustomPlot::AntialiasedElements was moved to QCP namespace
+      This replace should fix your code: "QCustomPlot::ae" -> "QCP::ae"
+    - the meaning of QCustomPlot::setAntialiasedElements has changed slightly: It is now an override to force elements to be antialiased. If you want to force
+      elements to not be drawn antialiased, use the new setNotAntialiasedElements. If an element is mentioned in neither of those functions, it now controls
+      its antialiasing itself via its "setAntialiased" function(s). (e.g. QCPAxis::setAntialiased(bool), QCPAbstractPlottable::setAntialiased(bool),
+      QCPAbstractPlottable::setAntialiasedScatters(bool), etc.)
+    - QCPAxis::setTickVector and QCPAxis::setTickVectorLabels no longer take a pointer but a const reference of the respective QVector as parameter.
+      (handing over a pointer didn't give any noticeable performance benefits but was inconsistent with the rest of the interface)
+    - Equally QCPAxis::tickVector and QCPAxis::tickVectorLabels don't return by pointer but by value now
+    - QCustomPlot::savePngScaled was removed, its purpose is now included as optional parameter "scale" of savePng.
+    - If you have derived from QCPAbstractPlottable: all selectTest functions now consistently take the argument "const QPointF &pos" which is the test point in pixel coordinates.
+      (the argument there was "double key, double value" in plot coordinates, before).
+    - QCPAbstractPlottable, QCPAxis and QCPLegend now inherit from QCPLayerable
+    - If you have derived from QCPAbstractPlottable: the draw method signature has changed from "draw (..) const" to "draw (..)", i.e. the method
+      is not const anymore. This allows the draw function of your plottable to perform buffering/caching operations, if necessary.
+
+  Added features:
+    - Item system: QCPAbstractItem, QCPItemAnchor, QCPItemPosition, QCPLineEnding. Allows placing of lines, arrows, text, pixmaps etc.
+      - New Items: QCPItemStraightLine, QCPItemLine, QCPItemCurve, QCPItemEllipse, QCPItemRect, QCPItemPixmap, QCPItemText, QCPItemBracket, QCPItemTracer
+      - QCustomPlot::addItem/itemCount/item/removeItem/selectedItems
+      - signals QCustomPlot::itemClicked/itemDoubleClicked
+      - the QCustomPlot interactions property now includes iSelectItems (for selection of QCPAbstractItem)
+      - QCPLineEnding. Represents the different styles a line/curve can end (e.g. different arrows, circle, square, bar, etc.), see e.g. QCPItemCurve::setHead
+    - Layer system: QCPLayerable, QCPLayer. Allows more sophisticated control over drawing order and a kind of grouping.
+      - QCPAbstractPlottable, QCPAbstractItem, QCPAxis, QCPGrid, QCPLegend are layerables and derive from QCPLayerable
+      - QCustomPlot::addLayer/moveLayer/removeLayer/setCurrentLayer/layer/currentLayer/layerCount
+      - Initially there are three layers: "grid", "main", and "axes". The "main" layer is initially empty and set as current layer, so new plottables/items are put there.
+    - QCustomPlot::viewport now makes the previously inaccessible viewport rect read-only-accessible (needed that for item-interface)
+    - PNG export now allows transparent background by calling QCustomPlot::setColor(Qt::transparent) before savePng
+    - QCPStatisticalBox outlier symbols may now be all scatter symbols, not only hardcoded circles.
+    - perfect precision of scatter symbol/error bar drawing and clipping in both antialiased and non-antialiased mode, by introducing QCPPainter
+      that works around some QPainter bugs/inconveniences. Further, more complex symbols like ssCrossSquare used to look crooked, now they look good.
+    - new antialiasing control system: Each drawing element now has its own "setAntialiased" function to control whether it is drawn antialiased.
+      - QCustomPlot::setAntialiasedElements and QCustomPlot::setNotAntialiasedElements can be used to override the individual settings.
+      - Subclasses of QCPAbstractPlottable can now use the convenience functions like applyFillAntialiasingHint or applyScattersAntialiasingHint to
+        easily make their drawing code comply with the overall antialiasing system.
+    - QCustomPlot::setNoAntialiasingOnDrag allows greatly improved performance and responsiveness by temporarily disabling all antialiasing while
+      the user is dragging axis ranges
+    - QCPGraph can now show scatter symbols at data points and hide its line (see QCPGraph::setScatterStyle, setScatterSize, setScatterPixmap, setLineStyle)
+    - Grid drawing code was sourced out from QCPAxis to QCPGrid. QCPGrid is mainly an internal class and every QCPAxis owns one. The grid interface still
+      works through QCPAxis and hasn't changed. The separation allows the grid to be drawn on a different layer as the axes, such that e.g. a graph can
+      be above the grid but below the axes.
+    - QCustomPlot::hasPlottable(plottable), returns whether the QCustomPlot contains the plottable
+    - QCustomPlot::setPlottingHint/setPlottingHints, plotting hints control details about the plotting quality/speed
+    - export to jpg and bmp added (QCustomPlot::saveJpg/saveBmp), as well as control over compression quality for png and jpg
+    - multi-select-modifier may now be specified with QCustomPlot::setMultiSelectModifier and is not fixed to Ctrl anymore
+
+  Bugfixes:
+    - fixed QCustomPlot ignores replot after it had size (0,0) even if size becomes valid again
+    - on Windows, a repaint used to be delayed during dragging/zooming of a complex plot, until the drag operation was done.
+      This was fixed, i.e. repaints are forced after a replot() call. See QCP::phForceRepaint and setPlottingHints.
+    - when using the raster paintengine and exporting to scaled PNG, pen widths are now scaled correctly (QPainter bug workaround via QCPPainter)
+    - PDF export now respects QCustomPlot background color (QCustomPlot::setColor), also Qt::transparent
+    - fixed a bug on QCPBars and QCPStatisticalBox where auto-rescaling of axis would fail when all data is very small (< 1e-11)
+    - fixed mouse event propagation bug that prevented range dragging from working on KDE (GNU/Linux)
+    - fixed a compiler warning on 64-bit systems due to pointer cast to int instead of quintptr in a qDebug output
+
+  Other:
+    - Added support for easier shared library creation (including examples for compiling and using QCustomPlot as shared library)
+    - QCustomPlot now has the Qt::WA_OpaquePaintEvent widget attribute (gives slightly improved performance).
+    - QCP::aeGraphs (enum QCP::AntialiasedElement, previously QCustomPlot::aeGraphs) has been marked deprecated since version 02.02.12 and
+      was now removed. Use QCP::aePlottables instead.
+    - optional performance-quality-tradeoff for solid graph lines (see QCustomPlot::setPlottingHints).
+    - marked data classes and QCPRange as Q_MOVABLE_TYPE
+    - replaced usage of own macro FUNCNAME with Qt macro Q_FUNC_INFO
+    - QCustomPlot now returns a minimum size hint of 50*50
+
+#### Version released on 31.03.12 ####
+
+  Changes that (might) break backward compatibility:
+  - QCPAbstractLegendItem now inherits from QObject
+  - mousePress, mouseMove and mouseRelease signals are now emitted before and not after any QCustomPlot processing (range dragging, selecting, etc.)
+
+  Added features:
+  - Interaction system: now allows selecting of objects like plottables, axes, legend and plot title, see QCustomPlot::setInteractions documentation
+  - Interaction system for plottables:
+    - setSelectable, setSelected, setSelectedPen, setSelectedBrush, selectTest on QCPAbstractPlottable and all derived plottables
+    - setSelectionTolerance on QCustomPlot
+    - selectedPlottables and selectedGraphs on QCustomPlot (returns the list of currently selected plottables/graphs)
+  - Interaction system for axes:
+    - setSelectable, setSelected, setSelectedBasePen, setSelectedTickPen, setSelectedSubTickPen, setSelectedLabelFont, setSelectedTickLabelFont,
+      setSelectedLabelColor, setSelectedTickLabelColor, selectTest on QCPAxis
+    - selectedAxes on QCustomPlot (returns a list of the axes that currently have selected parts)
+  - Interaction system for legend:
+    - setSelectable, setSelected, setSelectedBorderPen, setSelectedIconBorderPen, setSelectedBrush, setSelectedFont, setSelectedTextColor, selectedItems on QCPLegend
+    - setSelectedFont, setSelectedTextColor, setSelectable, setSelected on QCPAbstractLegendItem
+    - selectedLegends on QCustomPlot
+  - Interaction system for title:
+    - setSelectedTitleFont, setSelectedTitleColor, setTitleSelected on QCustomPlot
+  - new signals in accordance with the interaction system:
+    - selectionChangedByUser on QCustomPlot
+    - selectionChanged on QCPAbstractPlottable
+    - selectionChanged on QCPAxis
+    - selectionChanged on QCPLegend and QCPAbstractLegendItem
+    - plottableClick, legendClick, axisClick, titleClick, plottableDoubleClick, legendDoubleClick, axisDoubleClick, titleDoubleClick on QCustomPlot
+  - QCustomPlot::deselectAll (deselects everything, i.e. axes and plottables)
+  - QCPAbstractPlottable::pixelsToCoords (inverse function to the already existing coordsToPixels function)
+  - QCPRange::contains(double value)
+  - QCPAxis::setLabelColor and setTickLabelColor
+  - QCustomPlot::setTitleColor
+  - QCustomPlot now emits beforeReplot and afterReplot signals. Note that it is safe to make two customPlots mutually call eachothers replot functions
+    in one of these slots, it will not cause an infinite loop. (usefull for synchronizing axes ranges between two customPlots, because setRange alone doesn't replot)
+  - If the Qt version is 4.7 or greater, the tick label strings in date-time-mode now support sub-second accuracy (e.g. with format like "hh:mm:ss.zzz").
+
+  Bugfixes:
+  - tick labels/margins should no longer oscillate by one pixel when dragging range or replotting repeatedly while changing e.g. data. This
+    was caused by a bug in Qt's QFontMetrics::boundingRect function when the font has an integer point size (probably some rounding problem).
+    The fix hence consists of creating a temporary font (only for bounding-box calculation) which is 0.05pt larger and thus avoiding the
+    jittering rounding outcome.
+  - tick label, axis label and plot title colors used to be undefined. This was fixed by providing explicit color properties.
+    
+  Other:
+  - fixed some glitches in the documentation
+  - QCustomPlot::replot and QCustomPlot::rescaleAxes are now slots
+
+#### Version released on 02.02.12 ####
+
+  Changes that break backward compatibility:
+  - renamed all secondary classes from QCustomPlot[...] to QCP[...]:
+    QCustomPlotAxis -> QCPAxis
+    QCustomPlotGraph -> QCPGraph
+    QCustomPlotRange -> QCPRange
+    QCustomPlotData -> QCPData
+    QCustomPlotDataMap -> QCPDataMap
+    QCustomPlotLegend -> QCPLegend
+    QCustomPlotDataMapIterator -> QCPDataMapIterator
+    QCustomPlotDataMutableMapIterator -> QCPDataMutableMapIterator
+    A simple search and replace on all code files should make your code run again, e.g. consider the regex "QCustomPlot(?=[AGRDL])" -> "QCP".
+    Make sure not to just replace "QCustomPlot" with "QCP" because the main class QCustomPlot hasn't changed to QCP.
+    This change was necessary because class names became unhandy, pardon my bad naming decision in the beginning.
+  - QCPAxis::tickLength() and QCPAxis::subTickLength() now each split into two functions for inward and outward ticks (tickLengthIn/tickLengthOut).
+  - QCPLegend now uses QCPAbstractLegendItem to carry item data (before, the legend was passed QCPGraphs directly)
+  - QCustomPlot::addGraph() now doesn't return the index of the created graph anymore, but a pointer to the created QCPGraph.
+  - QCustomPlot::setAutoAddGraphToLegend is replaced by setAutoAddPlottableToLegend
+
+  Added features:
+  - Reversed axis range with QCPAxis::setRangeReversed(bool)
+  - Tick labels are now only drawn if not clipped by the viewport (widget border) on the sides (e.g. left and right on a horizontal axis).
+  - Zerolines. Like grid lines only with a separate pen (QCPAxis::setZeroLinePen), at tick position zero.
+  - Outward ticks. QCPAxis::setTickLength/setSubTickLength now accepts two arguments for inward and outward tick length. This doesn't break
+    backward compatibility because the second argument (outward) has default value zero and thereby a call with one argument hasn't changed its meaning.
+  - QCPGraph now inherits from QCPAbstractPlottable
+  - QCustomPlot::addPlottable/plottable/removePlottable/clearPlottables added to interface with the new QCPAbstractPlottable-based system. The simpler interface
+    which only acts on QCPGraphs (addGraph, graph, removeGraph, etc.) was adapted internally and is kept for backward compatibility and ease of use.
+  - QCPLegend items for plottables (e.g. graphs) can automatically wrap their texts to fit the widths, see QCPLegend::setMinimumSize and QCPPlottableLegendItem::setTextWrap.
+  - QCustomPlot::rescaleAxes. Adapts axis ranges to show all plottables/graphs, by calling QCPAbstractPlottable::rescaleAxes on all plottables in the plot.
+  - QCPCurve. For plotting of parametric curves.
+  - QCPBars. For plotting of bar charts.
+  - QCPStatisticalBox. For statistical box plots.
+
+  Bugfixes:
+  - Fixed QCustomPlot::removeGraph(int) not being able to remove graph index 0
+  - made QCustomPlot::replot() abort painting when painter initialization fails (e.g. because width/height of QCustomPlot is zero)
+  - The distance of the axis label from the axis ignored the tick label padding, this could have caused overlapping axis labels and tick labels
+  - fixed memory leak in QCustomPlot (dtor didn't delete legend)
+  - fixed bug that prevented QCPAxis::setRangeLower/Upper from setting the value to exactly 0.
+
+  Other:
+  - Changed default error bar handle size (QCustomPlotGraph::setErrorBarSize) from 4 to 6.
+  - Removed QCustomPlotDataFetcher. Was deprecated and not used class.
+  - Extended documentation, especially class descriptions.
+
+#### Version released on 15.01.12 ####
+
+  Changes that (might) break backward compatibility:
+  - QCustomPlotGraph now inherits from QObject
+  
+  Added features:
+  - Added axis background pixmap (QCustomPlot::setAxisBackground, setAxisBackgroundScaled, setAxisBackgroundScaledMode)
+  - Added width and height parameter on PDF export function QCustomPlot::savePdf(). This now allows PDF export to
+    have arbitrary dimensions, independent of the current geometry of the QCustomPlot.
+  - Added overload of QCustomPlot::removeGraph that takes QCustomPlotGraph* as parameter, instead the index of the graph
+  - Added all enums to the Qt meta system via Q_ENUMS(). The enums can now be transformed
+    to QString values easily with the Qt meta system, which makes saving state e.g. as XML
+    significantly nicer.
+  - added typedef QMapIterator<double,QCustomPlotData> QCustomPlotDataMapIterator
+    and typedef QMutableMapIterator<double,QCustomPlotData> QCustomPlotDataMutableMapIterator
+    for improved information hiding, when using iterators outside QCustomPlot code
+  
+  Bugfixes:
+  - Fixed savePngScaled. Axis/label drawing functions used to reset the painter transform
+    and thereby break savePngScaled. Now they buffer the current transform and restore it afterwards.
+  - Fixed some glitches in the doxygen comments (affects documentation only)
+  
+  Other:
+  - Changed the default tickLabelPadding of top axis from 3 to 6 pixels. Looks better.
+  - Changed the default QCustomPlot::setAntialiasedElements setting: Graph fills are now antialiased
+    by default. That's a bit slower, but makes fill borders look better.
+
+#### Version released on 19.11.11 ####
+
+  Changes that break backward compatibility:
+  - QCustomPlotAxis: tickFont and setTickFont renamed to tickLabelFont and setTickLabelFont (for naming consistency)
+
+  Other:
+  - QCustomPlotAxis: Added rotated tick labels, see setTickLabelRotation
+