148 lines
2.7 KiB
C++
148 lines
2.7 KiB
C++
#include "osciwidget.h"
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#include <cmath>
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#include <QLine>
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OsciWidget::OsciWidget(QWidget *parent) :
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QWidget(parent)
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{
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restartTimer();
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resizePixmap();
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}
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int OsciWidget::framerate() const
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{
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return m_framerate;
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}
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int OsciWidget::blend() const
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{
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return m_blend;
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}
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float OsciWidget::factor() const
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{
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return m_factor;
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}
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void OsciWidget::setFramerate(int framerate)
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{
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if (framerate == m_framerate)
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return;
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qDebug() << "change framerate to" << framerate;
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m_framerate = framerate;
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restartTimer();
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}
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void OsciWidget::setBlend(int blend)
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{
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if (blend == m_blend)
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return;
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qDebug() << "change blend to" << blend;
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m_blend = blend;
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}
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void OsciWidget::setFactor(float factor)
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{
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m_factor = factor;
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}
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void OsciWidget::renderSamples(const SamplePair *begin, const SamplePair *end)
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{
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QPainter painter;
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painter.begin(&m_pixmap);
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painter.setCompositionMode(QPainter::CompositionMode_Plus);
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QPen pen;
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pen.setWidth(2);
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pen.setColor(QColor(0, 255, 0));
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painter.setPen(pen);
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// Paint from center
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painter.translate(width()/2, height()/2);
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for (auto i = begin; i < end; i++)
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{
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const qreal x = (qreal(i->x) / std::numeric_limits<qint16>::max() / 2 * width() / 2 * m_factor);
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const qreal y = (qreal(i->y) / std::numeric_limits<qint16>::max() / 2 * height() / 2 * m_factor);
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const QPointF p{x, y};
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if (Q_LIKELY(m_lastPoint.has_value()))
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{
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auto speed = QLineF(*m_lastPoint, p).length();
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if (speed < 1)
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speed = 1;
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auto brightness = 1./speed;
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painter.setOpacity(brightness);
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painter.drawLine(*m_lastPoint, p);
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}
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m_lastPoint = p;
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}
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painter.end();
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}
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void OsciWidget::paintEvent(QPaintEvent *event)
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{
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Q_UNUSED(event)
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QPainter painter;
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painter.begin(this);
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painter.drawPixmap(0, 0, m_pixmap);
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painter.end();
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// Fade pixmap by multiplying all pixels by m_blend
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painter.begin(&m_pixmap);
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painter.setCompositionMode(QPainter::CompositionMode_Multiply);
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painter.fillRect(m_pixmap.rect(), QColor(m_blend,m_blend,m_blend));
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painter.end();
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}
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void OsciWidget::timerEvent(QTimerEvent *event)
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{
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if (event->timerId() == m_timerId)
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{
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repaint();
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}
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else
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QWidget::timerEvent(event);
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}
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void OsciWidget::resizeEvent(QResizeEvent *event)
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{
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Q_UNUSED(event)
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resizePixmap();
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}
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void OsciWidget::stop()
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{
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if (m_timerId != -1)
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killTimer(m_timerId);
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}
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void OsciWidget::start()
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{
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m_timerId = startTimer(1000/m_framerate);
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}
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void OsciWidget::restartTimer()
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{
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stop();
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start();
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}
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void OsciWidget::resizePixmap()
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{
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m_pixmap = QPixmap(size());
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m_pixmap.fill(QColor());
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}
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