chartview.cpp Example File
scatterinteractions/chartview.cpp
#include "chartview.h"
#include <QtCore/QtMath>
#include <QtCore/QDebug>
QT_CHARTS_USE_NAMESPACE
ChartView::ChartView(QWidget *parent)
: QChartView(new QChart(), parent),
m_scatter(0),
m_scatter2(0)
{
setRenderHint(QPainter::Antialiasing);
chart()->setTitle("Click to interact with scatter points");
m_scatter = new QScatterSeries();
m_scatter->setName("scatter1");
for (qreal x(0.5); x <= 4.0; x += 0.5) {
for (qreal y(0.5); y <= 4.0; y += 0.5)
*m_scatter << QPointF(x, y);
}
m_scatter2 = new QScatterSeries();
m_scatter2->setName("scatter2");
chart()->addSeries(m_scatter2);
chart()->addSeries(m_scatter);
chart()->createDefaultAxes();
chart()->axisX()->setRange(0, 4.5);
chart()->axisY()->setRange(0, 4.5);
connect(m_scatter, &QScatterSeries::clicked, this, &ChartView::handleClickedPoint);
}
ChartView::~ChartView()
{
}
void ChartView::handleClickedPoint(const QPointF &point)
{
QPointF clickedPoint = point;
QPointF closest(INT_MAX, INT_MAX);
qreal distance(INT_MAX);
const auto points = m_scatter->points();
for (const QPointF ¤tPoint : points) {
qreal currentDistance = qSqrt((currentPoint.x() - clickedPoint.x())
* (currentPoint.x() - clickedPoint.x())
+ (currentPoint.y() - clickedPoint.y())
* (currentPoint.y() - clickedPoint.y()));
if (currentDistance < distance) {
distance = currentDistance;
closest = currentPoint;
}
}
m_scatter->remove(closest);
m_scatter2->append(closest);
}