84 lines
1.8 KiB
C++
84 lines
1.8 KiB
C++
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// Simple bargraph meter
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// Implemented by Edson Pereira PY2SDR
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#include "meterwidget.h"
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#include <QPainter>
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#include <QPolygon>
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#include "moc_meterwidget.cpp"
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#define MAXDB 90
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MeterWidget::MeterWidget(QWidget * parent)
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: QWidget {parent}
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, m_signal {0}
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, m_noisePeak {0}
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, m_sigPeak {0}
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{
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for ( int i = 0; i < 10; i++ ) {
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signalQueue.enqueue(0);
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}
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}
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void MeterWidget::setValue(int value)
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{
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m_signal = value;
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signalQueue.enqueue(value);
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signalQueue.dequeue();
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// Get signal peak
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int tmp = 0;
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for (int i = 0; i < signalQueue.size(); ++i) {
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if (signalQueue.at(i) > tmp)
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tmp = signalQueue.at(i);
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}
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m_noisePeak = tmp;
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update();
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}
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QSize MeterWidget::sizeHint () const
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{
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return {10, 100};
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}
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void MeterWidget::paintEvent (QPaintEvent * event)
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{
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QWidget::paintEvent (event);
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// Sanitize
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m_signal = m_signal < 0 ? 0 : m_signal;
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m_signal = m_signal > MAXDB ? MAXDB : m_signal;
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QPainter p {this};
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p.setPen (Qt::NoPen);
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auto const& target = contentsRect ();
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QRect r {QPoint {target.left (), static_cast<int> (target.top () + target.height () - m_signal / (double)MAXDB * target.height ())}
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, QPoint {target.right (), target.bottom ()}};
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p.setBrush (QColor(85,170,85));
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if (m_sigPeak > 85) {
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p.setBrush(Qt::red);
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}
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else if (m_noisePeak < 15) {
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p.setBrush(QColor(232,81,0));
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}
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p.drawRect (r);
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if (m_noisePeak)
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{
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// Draw peak hold indicator
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auto peak = static_cast<int> (target.top () + target.height () - m_noisePeak / (double)MAXDB * target.height ());
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p.setBrush (Qt::black);
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p.translate (target.left (), peak);
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p.drawPolygon (QPolygon {{{0, -4}, {0, 4}, {target.width (), 0}}});
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}
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}
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//
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void MeterWidget::set_sigPeak(int value)
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{
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m_sigPeak = value;
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}
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