129 lines
2.9 KiB
C++
129 lines
2.9 KiB
C++
#include "scratchwidget.h"
|
|
|
|
#include <QPainter>
|
|
#include <QRect>
|
|
#include <QMouseEvent>
|
|
#include <QDebug>
|
|
|
|
#include "graphrenderer.h"
|
|
|
|
ScratchWidget::ScratchWidget(QWidget *parent) :
|
|
QWidget{parent}
|
|
{
|
|
connect(&m_timer, &QTimer::timeout, this, &ScratchWidget::timeout);
|
|
m_timer.setSingleShot(true);
|
|
m_timer.setInterval(100);
|
|
}
|
|
|
|
void ScratchWidget::paintEvent(QPaintEvent *event)
|
|
{
|
|
QPainter painter;
|
|
painter.begin(this);
|
|
|
|
painter.setPen({});
|
|
painter.setBrush(palette().window());
|
|
painter.drawRect(rect());
|
|
|
|
if (m_buffer.isValid() && m_position < m_buffer.frameCount() - m_framesPerBeat)
|
|
{
|
|
{
|
|
QPen pen{Qt::blue};
|
|
pen.setWidth(3);
|
|
painter.setPen(pen);
|
|
}
|
|
|
|
const auto doit = [&](int offset)
|
|
{
|
|
int x = ((width()/2)-(float(m_position % m_framesPerBeat) / m_framesPerBeat * m_beatWidth)) + (m_beatWidth*offset);
|
|
const auto pixmap = getPixmap((m_position/m_framesPerBeat)+offset);
|
|
if (!pixmap.isNull())
|
|
painter.drawPixmap(x, 0, pixmap);
|
|
};
|
|
|
|
doit(-2);
|
|
doit(-1);
|
|
doit(0);
|
|
doit(1);
|
|
doit(2);
|
|
}
|
|
|
|
{
|
|
QPen pen{Qt::red};
|
|
pen.setWidth(3);
|
|
painter.setPen(pen);
|
|
}
|
|
|
|
painter.drawLine(width()/2, 0, width()/2, height());
|
|
|
|
painter.end();
|
|
}
|
|
|
|
void ScratchWidget::mousePressEvent(QMouseEvent *event)
|
|
{
|
|
if (event->button() == Qt::LeftButton)
|
|
{
|
|
m_scratching = true;
|
|
m_mouseX = event->x();
|
|
m_timestamp = QDateTime::currentDateTime();
|
|
setMouseTracking(true);
|
|
emit scratchBegin();
|
|
emit scratchSpeed(0.f);
|
|
}
|
|
}
|
|
|
|
void ScratchWidget::mouseReleaseEvent(QMouseEvent *event)
|
|
{
|
|
if (event->button() == Qt::LeftButton)
|
|
{
|
|
m_timer.stop();
|
|
emit scratchSpeed(1.f);
|
|
m_scratching = false;
|
|
setMouseTracking(false);
|
|
emit scratchEnd();
|
|
}
|
|
}
|
|
|
|
void ScratchWidget::mouseMoveEvent(QMouseEvent *event)
|
|
{
|
|
if (m_scratching)
|
|
{
|
|
const auto now = QDateTime::currentDateTime();
|
|
|
|
int dx = m_mouseX - event->x();
|
|
int dt = m_timestamp.msecsTo(now);
|
|
|
|
emit scratchSpeed(float(dx) / dt * m_framesPerBeat / m_beatWidth / 50);
|
|
|
|
m_mouseX = event->x();
|
|
m_timestamp = now;
|
|
m_timer.start();
|
|
}
|
|
}
|
|
|
|
void ScratchWidget::timeout()
|
|
{
|
|
emit scratchSpeed(0.f);
|
|
}
|
|
|
|
QPixmap ScratchWidget::getPixmap(int index)
|
|
{
|
|
{
|
|
const auto pixmap = m_graphCache[index];
|
|
if (pixmap)
|
|
return *pixmap;
|
|
}
|
|
|
|
if (!m_buffer.isValid() || index < 0 || index >= m_buffer.frameCount()/m_framesPerBeat)
|
|
{
|
|
qWarning() << index;
|
|
return {};
|
|
}
|
|
|
|
const auto *begin = m_buffer.constData<frame_t>() + (index*m_framesPerBeat);
|
|
const auto pixmap = GraphRenderer::render(QSize{m_beatWidth, height()}, begin, begin+m_framesPerBeat, palette());
|
|
|
|
m_graphCache.insert(index, new QPixmap{pixmap});
|
|
|
|
return pixmap;
|
|
}
|