Qt 5.9 | Qt Charts | ScatterChart Example | chartview.cpp Example File

Qt 5.9.3 Reference Documentation

# chartview.cpp Example File

scatterchart/chartview.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the Qt Charts module of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:GPL$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see https://www.qt.io/terms-conditions. For further
      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** GNU General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU
      ** General Public License version 3 or (at your option) any later version
      ** approved by the KDE Free Qt Foundation. The licenses are as published by
      ** the Free Software Foundation and appearing in the file LICENSE.GPL3
      ** included in the packaging of this file. Please review the following
      ** information to ensure the GNU General Public License requirements will
      ** be met: https://www.gnu.org/licenses/gpl-3.0.html.
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      #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(28, 15);
          for (int i = 1; i < 5; ++i) {
              starPath.lineTo(14 + 14 * qCos(0.8 * i * Pi),
                              15 + 14 * 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);
          series2->setPen(QColor(Qt::transparent));

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

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

          chart()->legend()->setMarkerShape(QLegend::MarkerShapeFromSeries);
      }