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108 lines
2.8 KiB
C++
108 lines
2.8 KiB
C++
// Simple bargraph dB meter
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// Implemented by Edson Pereira PY2SDR
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//
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#include "signalmeter.h"
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#include <QVBoxLayout>
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#include <QHBoxLayout>
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#include <QLabel>
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#include <QPainter>
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#include <QFontMetrics>
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#include <QDebug>
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#include "meterwidget.h"
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#include "moc_signalmeter.cpp"
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#define MAXDB 90
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class Scale final
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: public QWidget
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{
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public:
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explicit Scale (QWidget * parent = 0)
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: QWidget {parent}
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{
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setSizePolicy (QSizePolicy::Minimum, QSizePolicy::MinimumExpanding);
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}
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QSize sizeHint () const override
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{
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return minimumSizeHint ();
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}
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QSize minimumSizeHint () const override
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{
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QFontMetrics font_metrics {font (), nullptr};
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return {tick_length + text_indent + font_metrics.boundingRect ("00+").width (), (font_metrics.height () + line_spacing) * range};
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}
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protected:
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void paintEvent (QPaintEvent * event) override
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{
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QWidget::paintEvent (event);
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QPainter p {this};
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auto const& target = contentsRect ();
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QFontMetrics font_metrics {p.font (), this};
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auto font_offset = font_metrics.ascent () / 2;
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p.drawLine (target.left (), target.top () + font_offset, target.left (), target.bottom () - font_offset - font_metrics.descent ());
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for (int i = 0; i <= range; ++i)
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{
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p.save ();
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p.translate (target.left ()
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, target.top () + font_offset + i * (target.height () - font_metrics.ascent () - font_metrics.descent ()) / range);
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p.drawLine (0, 0, tick_length, 0);
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if((i%2==1)) {
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auto text = QString::number ((range - i) * scale);
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p.drawText (tick_length + text_indent, font_offset, text);
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}
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p.restore ();
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}
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}
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private:
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static int constexpr tick_length {4};
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static int constexpr text_indent {2};
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static int constexpr line_spacing {0};
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static int constexpr range {MAXDB/10};
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static int constexpr scale {10};
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};
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SignalMeter::SignalMeter (QWidget * parent)
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: QFrame {parent}
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{
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auto outer_layout = new QVBoxLayout;
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outer_layout->setSpacing (0);
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auto inner_layout = new QHBoxLayout;
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inner_layout->setContentsMargins (9, 0, 9, 0);
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inner_layout->setSpacing (0);
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m_meter = new MeterWidget;
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m_meter->setSizePolicy (QSizePolicy::Minimum, QSizePolicy::Minimum);
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inner_layout->addWidget (m_meter);
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m_scale = new Scale;
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inner_layout->addWidget (m_scale);
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m_reading = new QLabel(this);
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outer_layout->addLayout (inner_layout);
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outer_layout->addWidget (m_reading);
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setLayout (outer_layout);
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}
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void SignalMeter::setValue(float value, float valueMax)
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{
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if(value<0) value=0;
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QFontMetrics font_metrics {m_scale->font (), nullptr};
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m_meter->setContentsMargins (0, font_metrics.ascent () / 2, 0, font_metrics.ascent () / 2 + font_metrics.descent ());
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m_meter->setValue(int(value));
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m_meter->set_sigPeak(valueMax);
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QString t;
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t.sprintf("%d dB",int(value+0.5));
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m_reading->setText(t);
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}
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