qt-everywhere-src-5.15.1/qtcharts/examples/charts/customchart/main.cpp

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** This file is part of the Qt Charts module of the Qt Toolkit.
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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);

//![1]
    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);
//![1]

//![2]
    // 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);
//![2]

//![3]
    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);
//![3]

//![4]
    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);
//![4]

//![5]
    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);
//![5]

//![6]
    QMainWindow window;
    window.setCentralWidget(chartView);
    window.resize(400, 300);
    window.show();
//![6]

    return a.exec();
}