48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
#include "chart.h"
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#include <QtWidgets/QGesture>
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#include <QtWidgets/QGraphicsScene>
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#include <QtWidgets/QGraphicsView>
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#include <QLineSeries>
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#include <iostream>
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Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags)
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: QChart(QChart::ChartTypeCartesian, parent, wFlags)
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{
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// Seems that QGraphicsView (QChartView) does not grab gestures.
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// They can only be grabbed here in the QGraphicsWidget (QChart).
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grabGesture(Qt::PinchGesture);
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grabGesture(Qt::PanGesture);
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}
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Chart::~Chart() {
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}
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bool Chart::sceneEvent(QEvent *event) {
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if (event->type() == QEvent::Gesture)
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return gestureEvent(static_cast<QGestureEvent *>(event));
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return QChart::event(event);
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}
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bool Chart::gestureEvent(QGestureEvent *event) {
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if (QGesture *gesture = event->gesture(Qt::PanGesture)) {
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QPanGesture *pan = static_cast<QPanGesture *>(gesture);
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QChart::scroll(-(pan->delta().x()), pan->delta().y());
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}
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if (QGesture *gesture = event->gesture(Qt::PinchGesture)) {
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QPinchGesture *pinch = static_cast<QPinchGesture *>(gesture);
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if (pinch->changeFlags() & QPinchGesture::ScaleFactorChanged)
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QChart::zoom(pinch->scaleFactor());
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}
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return true;
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}
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void Chart::XRangeChanged(qreal min, qreal max) {
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std::cerr << "XRangeChanged" << min << "\t"<< max << std::endl;
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if (series().at(0)->type() == QtCharts::QAbstractSeries::SeriesTypeLine) {
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QLineSeries *s = static_cast<QLineSeries *>(series().at(0));
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std::cerr << s->at(0).x() << "\t"<< s->at(s->count()-1).x() << std::endl;
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}
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}
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