chartview.cpp Example File

scatterinteractions/chartview.cpp
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#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()->axes(Qt::Horizontal).first()->setRange(0, 4.5); chart()->axes(Qt::Vertical).first()->setRange(0, 4.5); connect(m_scatter, &QScatterSeries::clicked, this, &ChartView::handleClickedPoint); } ChartView::~ChartView() { } void ChartView::handleClickedPoint(const QPointF &point) { QPointF clickedPoint = point; // Find the closest point from series 1 QPointF closest(INT_MAX, INT_MAX); qreal distance(INT_MAX); const auto points = m_scatter->points(); for (const QPointF &currentPoint : 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; } } // Remove the closes point from series 1 and append it to series 2 m_scatter->remove(closest); m_scatter2->append(closest); }