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();
}

© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.