main.cpp Example File | Qt Charts 5.12.9

- Qt 5.12
- Qt Charts
- Custom Chart Example
- main.cpp Example File
- Qt Charts | Commercial or GPLv3

# main.cpp Example File

customchart/main.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
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     ****************************************************************************/

     #include <QtWidgets/QApplication>
     #include <QtWidgets/QMainWindow>
     #include <QtCharts/QChartView>
     #include <QtCharts/QLineSeries>
     #include <QtCharts/QCategoryAxis>

     QT_CHARTS_USE_NAMESPACE

     int main(int argc, char *argv[])
     {
         QApplication a(argc, argv);

         QLineSeries *series = new QLineSeries();
         *series << QPointF(0, 6) << QPointF(9, 4) << QPointF(15, 20) << QPointF(25, 12) << QPointF(29, 26);
         QChart *chart = new QChart();
         chart->legend()->hide();
         chart->addSeries(series);

         // Customize series
         QPen pen(QRgb(0xfdb157));
         pen.setWidth(5);
         series->setPen(pen);

         // Customize chart title
         QFont font;
         font.setPixelSize(18);
         chart->setTitleFont(font);
         chart->setTitleBrush(QBrush(Qt::white));
         chart->setTitle("Customchart example");

         // Customize chart background
         QLinearGradient backgroundGradient;
         backgroundGradient.setStart(QPointF(0, 0));
         backgroundGradient.setFinalStop(QPointF(0, 1));
         backgroundGradient.setColorAt(0.0, QRgb(0xd2d0d1));
         backgroundGradient.setColorAt(1.0, QRgb(0x4c4547));
         backgroundGradient.setCoordinateMode(QGradient::ObjectBoundingMode);
         chart->setBackgroundBrush(backgroundGradient);

         // Customize plot area background
         QLinearGradient plotAreaGradient;
         plotAreaGradient.setStart(QPointF(0, 1));
         plotAreaGradient.setFinalStop(QPointF(1, 0));
         plotAreaGradient.setColorAt(0.0, QRgb(0x555555));
         plotAreaGradient.setColorAt(1.0, QRgb(0x55aa55));
         plotAreaGradient.setCoordinateMode(QGradient::ObjectBoundingMode);
         chart->setPlotAreaBackgroundBrush(plotAreaGradient);
         chart->setPlotAreaBackgroundVisible(true);

         QCategoryAxis *axisX = new QCategoryAxis();
         QCategoryAxis *axisY = new QCategoryAxis();

         // Customize axis label font
         QFont labelsFont;
         labelsFont.setPixelSize(12);
         axisX->setLabelsFont(labelsFont);
         axisY->setLabelsFont(labelsFont);

         // Customize axis colors
         QPen axisPen(QRgb(0xd18952));
         axisPen.setWidth(2);
         axisX->setLinePen(axisPen);
         axisY->setLinePen(axisPen);

         // Customize axis label colors
         QBrush axisBrush(Qt::white);
         axisX->setLabelsBrush(axisBrush);
         axisY->setLabelsBrush(axisBrush);

         // Customize grid lines and shades
         axisX->setGridLineVisible(false);
         axisY->setGridLineVisible(false);
         axisY->setShadesPen(Qt::NoPen);
         axisY->setShadesBrush(QBrush(QColor(0x99, 0xcc, 0xcc, 0x55)));
         axisY->setShadesVisible(true);

         axisX->append("low", 10);
         axisX->append("optimal", 20);
         axisX->append("high", 30);
         axisX->setRange(0, 30);

         axisY->append("slow", 10);
         axisY->append("med", 20);
         axisY->append("fast", 30);
         axisY->setRange(0, 30);

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

         QChartView *chartView = new QChartView(chart);
         chartView->setRenderHint(QPainter::Antialiasing);

         QMainWindow window;
         window.setCentralWidget(chartView);
         window.resize(400, 300);
         window.show();

         return a.exec();
     }