chart.cpp Example File

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#include "chart.h" #include <QtWidgets/QGesture> #include <QtWidgets/QGraphicsScene> #include <QtWidgets/QGraphicsView> Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags) : QChart(QChart::ChartTypeCartesian, parent, wFlags) { // Seems that QGraphicsView (QChartView) does not grab gestures. // They can only be grabbed here in the QGraphicsWidget (QChart). 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; }

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