main.cpp Example File

openglseries/main.cpp
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 #include "datasource.h"
 #include <QtWidgets/QApplication>
 #include <QtWidgets/QMainWindow>
 #include <QtCharts/QChartView>
 #include <QtCharts/QLineSeries>
 #include <QtCharts/QScatterSeries>
 #include <QtCharts/QValueAxis>
 #include <QtCharts/QLogValueAxis>
 #include <QtWidgets/QLabel>

 // Uncomment to use logarithmic axes instead of regular value axes
 //#define USE_LOG_AXIS

 // Uncomment to use regular series instead of OpenGL accelerated series
 //#define DONT_USE_GL_SERIES

 // Uncomment to add a simple regular series (thick line) and a matching OpenGL series (thinner line)
 // to verify the series have same visible geometry.
 //#define ADD_SIMPLE_SERIES

 QT_CHARTS_USE_NAMESPACE

 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
     QStringList colors;
     colors << "red" << "blue" << "green" << "black";

     QChart *chart = new QChart();
     chart->legend()->hide();

 #ifdef USE_LOG_AXIS
     QLogValueAxis *axisX = new QLogValueAxis;
     QLogValueAxis *axisY = new QLogValueAxis;
 #else
     QValueAxis *axisX = new QValueAxis;
     QValueAxis *axisY = new QValueAxis;
 #endif

     chart->addAxis(axisX, Qt::AlignBottom);
     chart->addAxis(axisY, Qt::AlignLeft);

     const int seriesCount = 10;
 #ifdef DONT_USE_GL_SERIES
     const int pointCount = 100;
     chart->setTitle("Unaccelerated Series");
 #else
     const int pointCount = 10000;
     chart->setTitle("OpenGL Accelerated Series");
 #endif

     QList<QXYSeries *> seriesList;
     for (int i = 0; i < seriesCount; i++) {
         QXYSeries *series = 0;
         int colorIndex = i % colors.size();
         if (i % 2) {
             series = new QScatterSeries;
             QScatterSeries *scatter = static_cast<QScatterSeries *>(series);
             scatter->setColor(QColor(colors.at(colorIndex)));
             scatter->setMarkerSize(qreal(colorIndex + 2) / 2.0);
             // Scatter pen doesn't have affect in OpenGL drawing, but if you disable OpenGL drawing
             // this makes the marker border visible and gives comparable marker size to OpenGL
             // scatter points.
             scatter->setPen(QPen("black"));
         } else {
             series = new QLineSeries;
             series->setPen(QPen(QBrush(QColor(colors.at(colorIndex))),
                                 qreal(colorIndex + 2) / 2.0));
         }
         seriesList.append(series);
 #ifdef DONT_USE_GL_SERIES
         series->setUseOpenGL(false);
 #else
         series->setUseOpenGL(true);
 #endif
         chart->addSeries(series);
         series->attachAxis(axisX);
         series->attachAxis(axisY);
     }

     if (axisX->type() == QAbstractAxis::AxisTypeLogValue)
         axisX->setRange(0.1, 20.0);
     else
         axisX->setRange(0, 20.0);

     if (axisY->type() == QAbstractAxis::AxisTypeLogValue)
         axisY->setRange(0.1, 10.0);
     else
         axisY->setRange(0, 10.0);

 #ifdef ADD_SIMPLE_SERIES
     QLineSeries *simpleRasterSeries = new QLineSeries;
     *simpleRasterSeries << QPointF(0.001, 0.001)
                  << QPointF(2.5, 8.0)
                  << QPointF(5.0, 4.0)
                  << QPointF(7.5, 9.0)
                  << QPointF(10.0, 0.001)
                  << QPointF(12.5, 2.0)
                  << QPointF(15.0, 1.0)
                  << QPointF(17.5, 6.0)
                  << QPointF(20.0, 10.0);
     simpleRasterSeries->setUseOpenGL(false);
     simpleRasterSeries->setPen(QPen(QBrush("magenta"), 8));
     chart->addSeries(simpleRasterSeries);
     simpleRasterSeries->attachAxis(axisX);
     simpleRasterSeries->attachAxis(axisY);

     QLineSeries *simpleGLSeries = new QLineSeries;
     simpleGLSeries->setUseOpenGL(true);
     simpleGLSeries->setPen(QPen(QBrush("black"), 2));
     simpleGLSeries->replace(simpleRasterSeries->points());
     chart->addSeries(simpleGLSeries);
     simpleGLSeries->attachAxis(axisX);
     simpleGLSeries->attachAxis(axisY);
 #endif

     QChartView *chartView = new QChartView(chart);

     QMainWindow window;
     window.setCentralWidget(chartView);
     window.resize(600, 400);
     window.show();

     DataSource dataSource;
     dataSource.generateData(seriesCount, 10, pointCount);

     QLabel *fpsLabel = new QLabel(&window);
     QLabel *countLabel = new QLabel(&window);
     QString countText = QStringLiteral("Total point count: %1");
     countLabel->setText(countText.arg(pointCount * seriesCount));
     countLabel->adjustSize();
     fpsLabel->move(10, 2);
     fpsLabel->adjustSize();
     fpsLabel->raise();
     fpsLabel->show();
     countLabel->move(10, fpsLabel->height());
     fpsLabel->raise();
     countLabel->show();

     // We can get more than one changed event per frame, so do async update.
     // This also allows the application to be responsive.
     QObject::connect(chart->scene(), &QGraphicsScene::changed,
                      &dataSource, &DataSource::handleSceneChanged);

     dataSource.startUpdates(seriesList, fpsLabel);

     return a.exec();
 }