156 lines
2.9 KiB
C++
156 lines
2.9 KiB
C++
#include "osciwidget.h"
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#include <cmath>
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#include <QLine>
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namespace {
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template<typename T>
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auto pythagoras(const T &dx, const T &dy)
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{
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return std::sqrt(dx * dx + dy * dy);
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}
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auto pythagoras(const QLine &line)
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{
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return pythagoras(line.dx(), line.dy());
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}
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}
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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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createBlendPixmap();
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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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createBlendPixmap();
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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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for (auto i = begin; i < end; i++)
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{
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const qint32 x = (float(i->x) / std::numeric_limits<qint16>::max() / 2 * width() / 2 * m_factor) + (width() / 2);
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const qint32 y = (float(-i->y) / std::numeric_limits<qint16>::max() / 2 * height() / 2 * m_factor) + (height() / 2);
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const QPoint p{x,y};
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if (Q_LIKELY(m_lastPoint.has_value()))
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{
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auto dist = pythagoras(QLine(*m_lastPoint, p));
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if (dist < 1)
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dist = 1;
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pen.setColor(QColor(0, 1./dist*255, 0));
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painter.setPen(pen);
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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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painter.begin(&m_pixmap);
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painter.setCompositionMode(QPainter::CompositionMode_Multiply);
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painter.drawPixmap(0, 0, m_fadeoutPixmap);
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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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createBlendPixmap();
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}
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void OsciWidget::restartTimer()
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{
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if (m_timerId != -1)
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killTimer(m_timerId);
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m_timerId = startTimer(1000/m_framerate);
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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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void OsciWidget::createBlendPixmap()
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{
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m_fadeoutPixmap = QPixmap(size());
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m_fadeoutPixmap.fill(QColor(m_blend, m_blend, m_blend));
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}
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