Qt 5.7 | Qt Charts | ScatterChart Example | chartview.cpp Example File

Qt 5.7.1 Reference Documentation

# chartview.cpp Example File

scatterchart/chartview.cpp

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      ** Contact: https://www.qt.io/licensing/
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      #include "chartview.h"
      #include <QtCharts/QScatterSeries>
      #include <QtCharts/QLegendMarker>
      #include <QtGui/QImage>
      #include <QtGui/QPainter>
      #include <QtCore/QtMath>

      const float Pi = 3.14159f;

      ChartView::ChartView(QWidget *parent) :
          QChartView(new QChart(), parent)
      {
          QScatterSeries *series0 = new QScatterSeries();
          series0->setName("scatter1");
          series0->setMarkerShape(QScatterSeries::MarkerShapeCircle);
          series0->setMarkerSize(15.0);

          QScatterSeries *series1 = new QScatterSeries();
          series1->setName("scatter2");
          series1->setMarkerShape(QScatterSeries::MarkerShapeRectangle);
          series1->setMarkerSize(20.0);

          QScatterSeries *series2 = new QScatterSeries();
          series2->setName("scatter3");
          series2->setMarkerShape(QScatterSeries::MarkerShapeRectangle);
          series2->setMarkerSize(30.0);

          series0->append(0, 6);
          series0->append(2, 4);
          series0->append(3, 8);
          series0->append(7, 4);
          series0->append(10, 5);

          *series1 << QPointF(1, 1) << QPointF(3, 3) << QPointF(7, 6) << QPointF(8, 3) << QPointF(10, 2);
          *series2 << QPointF(1, 5) << QPointF(4, 6) << QPointF(6, 3) << QPointF(9, 5);

          QPainterPath starPath;
          starPath.moveTo(30, 15);
          for (int i = 1; i < 5; ++i) {
              starPath.lineTo(15 + 15 * qCos(0.8 * i * Pi),
                              15 + 15 * qSin(0.8 * i * Pi));
          }
          starPath.closeSubpath();

          QImage star(30, 30, QImage::Format_ARGB32);
          star.fill(Qt::transparent);

          QPainter painter(&star);
          painter.setRenderHint(QPainter::Antialiasing);
          painter.setPen(QRgb(0xf6a625));
          painter.setBrush(painter.pen().color());
          painter.drawPath(starPath);

          series2->setBrush(star);

          setRenderHint(QPainter::Antialiasing);
          chart()->addSeries(series0);
          chart()->addSeries(series1);
          chart()->addSeries(series2);

          chart()->setTitle("Simple scatterchart example");
          chart()->createDefaultAxes();
          chart()->setDropShadowEnabled(false);

          QList<QLegendMarker *> markers = chart()->legend()->markers(series2);
          for (int i = 0; i < markers.count(); i++)
              markers.at(i)->setBrush(painter.pen().color());
      }