chart.cpp Example File
zoomlinechart/chart.cpp
#include "chart.h"
#include <QtWidgets/QGesture>
#include <QtWidgets/QGraphicsScene>
#include <QtWidgets/QGraphicsView>
Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags)
: QChart(QChart::ChartTypeCartesian, parent, wFlags)
{
grabGesture(Qt::PanGesture);
grabGesture(Qt::PinchGesture);
}
Chart::~Chart()
{
}
bool Chart::sceneEvent(QEvent *event)
{
if (event->type() == QEvent::Gesture)
return gestureEvent(static_cast<QGestureEvent *>(event));
return QChart::event(event);
}
bool Chart::gestureEvent(QGestureEvent *event)
{
if (QGesture *gesture = event->gesture(Qt::PanGesture)) {
QPanGesture *pan = static_cast<QPanGesture *>(gesture);
QChart::scroll(-(pan->delta().x()), pan->delta().y());
}
if (QGesture *gesture = event->gesture(Qt::PinchGesture)) {
QPinchGesture *pinch = static_cast<QPinchGesture *>(gesture);
if (pinch->changeFlags() & QPinchGesture::ScaleFactorChanged)
QChart::zoom(pinch->scaleFactor());
}
return true;
}