chartview.cpp Example File | Qt Charts 5.12.8

- Qt 5.12
- Qt Charts
- Polar Chart Example
- chartview.cpp Example File
- Qt Charts | Commercial or GPLv3

# chartview.cpp Example File

polarchart/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
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     #include "chartview.h"
     #include <QtGui/QMouseEvent>
     #include <QtCore/QDebug>
     #include <QtCharts/QAbstractAxis>
     #include <QtCharts/QValueAxis>

     QT_CHARTS_USE_NAMESPACE

     ChartView::ChartView(QWidget *parent)
         : QChartView(parent)
     {
     }

     void ChartView::keyPressEvent(QKeyEvent *event)
     {
         switch (event->key()) {
         case Qt::Key_Plus:
             chart()->zoomIn();
             break;
         case Qt::Key_Minus:
             chart()->zoomOut();
             break;
         case Qt::Key_Left:
             chart()->scroll(-1.0, 0);
             break;
         case Qt::Key_Right:
             chart()->scroll(1.0, 0);
             break;
         case Qt::Key_Up:
             chart()->scroll(0, 1.0);
             break;
         case Qt::Key_Down:
             chart()->scroll(0, -1.0);
             break;
         case Qt::Key_Space:
             switchChartType();
             break;
         default:
             QGraphicsView::keyPressEvent(event);
             break;
         }
     }

     void ChartView::switchChartType()
     {
         QChart *newChart;
         QChart *oldChart = chart();

         if (oldChart->chartType() == QChart::ChartTypeCartesian)
             newChart = new QPolarChart();
         else
             newChart = new QChart();

         // Move series and axes from old chart to new one
         const QList<QAbstractSeries *> seriesList = oldChart->series();
         const QList<QAbstractAxis *> axisList = oldChart->axes();
         QList<QPair<qreal, qreal> > axisRanges;

         for (QAbstractAxis *axis : axisList) {
             QValueAxis *valueAxis = static_cast<QValueAxis *>(axis);
             axisRanges.append(QPair<qreal, qreal>(valueAxis->min(), valueAxis->max()));
         }

         for (QAbstractSeries *series : seriesList)
             oldChart->removeSeries(series);

         for (QAbstractAxis *axis : axisList) {
             oldChart->removeAxis(axis);
             newChart->addAxis(axis, axis->alignment());
         }

         for (QAbstractSeries *series : seriesList) {
             newChart->addSeries(series);
             for (QAbstractAxis *axis : axisList)
                 series->attachAxis(axis);
         }

         int count = 0;
         for (QAbstractAxis *axis : axisList) {
             axis->setRange(axisRanges[count].first, axisRanges[count].second);
             count++;
         }

         newChart->setTitle(oldChart->title());
         setChart(newChart);
         delete oldChart;
     }