Added spectrum histogram clear button

Readme.md

@@ -112,21 +112,24 @@ Done since the fork
   - Added a scope widget in the channel analyzer plugin
   - Channel analyzer bandwidth up to half the available RF (IF) bandwidth (was 48k fixed)
   - Enhanced scope display and controls: scale display, better X (time) and Y scales control, grid fit to scale, effectively implementing triggers, trigger on magnitude and phase, properly handling time shift, ...
-  - Enhanced spectrum display: Histogram: define NO_AVX, wider decay range, make stroke and late holdoff adjustable. Added option to show live spectrum (had only max hold before).
+  - Enhanced spectrum display: Histogram: wider decay range, make stroke and late holdoff adjustable. Added option to show live spectrum (had only max hold before).
   - Enhanced channel analyzer: enhanced scope and spectrum displays as mentioned above, make the spectrum display synchronous to scope (hence triggerable a la E4406A).
   - Sort channel plugins by delta frequency and type before saving to preset
   - Implemented scope pre-trigger delay
   - Implemented variable scope memory depth
   - Implemented trigger delay
   - Trigger on both edges
+  - Spectrum histogram clear
     
 =====
 To Do
 =====
 
-  - Enhance presets management (Edit, Move, Import/Export from/to human readable format like JSON)  
+  - Trigger line display for all trigger modes
   - Level calibration
-  - Enhance WFM (stereo, RDS?)
-  - Even more demods ... 
+  - Enhance presets management (Edit, Move, Import/Export from/to human readable format like JSON)  
   - recording capability
   - Tx channels for Rx/Tx boards like BladeRF
+  - Enhance WFM (stereo, RDS?)
+  - Even more demods ... 
+  

include-gpl/gui/glspectrum.h

@@ -54,6 +54,7 @@ public:
 	void removeChannelMarker(ChannelMarker* channelMarker);
 
 	void newSpectrum(const std::vector<Real>& spectrum, int fftSize);
+	void clearSpectrumHistogram();
 
 private:
 	struct ChannelMarkerState {

include-gpl/gui/glspectrumgui.h

@@ -70,6 +70,7 @@ private slots:
 	void on_current_toggled(bool checked);
 	void on_invert_toggled(bool checked);
 	void on_grid_toggled(bool checked);
+	void on_clearSpectrum_clicked(bool checked);
 };
 
 #endif // INCLUDE_GLSPECTRUMGUI_H

sdrbase/gui/glspectrum.cpp

@@ -472,6 +472,18 @@ void GLSpectrum::resizeGL(int width, int height)
 	m_changesPending = true;
 }
 
+void GLSpectrum::clearSpectrumHistogram()
+{
+	if(!m_mutex.tryLock(2))
+		return;
+
+	memset(m_histogram, 0x00, 100 * m_fftSize);
+	memset(m_histogramHoldoff, 0x07, 100 * m_fftSize);
+
+	m_mutex.unlock();
+	update();
+}
+
 void GLSpectrum::paintGL()
 {
 	if(!m_mutex.tryLock(2))

sdrbase/gui/glspectrumgui.cpp

@@ -288,3 +288,9 @@ void GLSpectrumGUI::on_traceIntensity_valueChanged(int index)
 	if(m_glSpectrum != NULL)
 		m_glSpectrum->setDisplayTraceIntensity(m_displayTraceIntensity);
 }
+
+void GLSpectrumGUI::on_clearSpectrum_clicked(bool checked)
+{
+	if(m_glSpectrum != NULL)
+		m_glSpectrum->clearSpectrumHistogram();
+}

sdrbase/gui/glspectrumgui.ui

@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>273</width>
+    <width>320</width>
     <height>60</height>
    </rect>
   </property>
@@ -270,6 +270,9 @@
        <property name="checkable">
         <bool>true</bool>
        </property>
+       <property name="autoRaise">
+        <bool>false</bool>
+       </property>
       </widget>
      </item>
      <item>
@@ -484,6 +487,38 @@
        </property>
       </widget>
      </item>
+     <item>
+      <widget class="QPushButton" name="clearSpectrum">
+       <property name="minimumSize">
+        <size>
+         <width>24</width>
+         <height>24</height>
+        </size>
+       </property>
+       <property name="maximumSize">
+        <size>
+         <width>24</width>
+         <height>24</height>
+        </size>
+       </property>
+       <property name="toolTip">
+        <string>Clear spectrum histogram</string>
+       </property>
+       <property name="text">
+        <string/>
+       </property>
+       <property name="icon">
+        <iconset resource="../resources/res.qrc">
+         <normaloff>:/clear.png</normaloff>:/clear.png</iconset>
+       </property>
+       <property name="iconSize">
+        <size>
+         <width>16</width>
+         <height>16</height>
+        </size>
+       </property>
+      </widget>
+     </item>
      <item>
       <widget class="QDial" name="traceIntensity">
        <property name="maximumSize">

sdrbase/resources/res.qrc

@@ -24,5 +24,6 @@
         <file>vertical_w.png</file>
         <file>current.png</file>
         <file>slopeb_icon.png</file>
+        <file>clear.png</file>
     </qresource>
 </RCC>