BarChart Example

The example shows how to create a bar chart.
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Publié le 27 décembre 2024 - Mis à jour le 27 décembre 2024
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** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
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#include &lt;QtWidgets/QApplication&gt;
#include &lt;QtWidgets/QMainWindow&gt;
#include &lt;QtCharts/QChartView&gt;
#include &lt;QtCharts/QBarSeries&gt;
#include &lt;QtCharts/QBarSet&gt;
#include &lt;QtCharts/QLegend&gt;
#include &lt;QtCharts/QBarCategoryAxis&gt;
#include &lt;QtCharts/QValueAxis&gt;

QT_CHARTS_USE_NAMESPACE

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

    QBarSet *set0 = new QBarSet("Jane");
    QBarSet *set1 = new QBarSet("John");
    QBarSet *set2 = new QBarSet("Axel");
    QBarSet *set3 = new QBarSet("Mary");
    QBarSet *set4 = new QBarSet("Samantha");

    *set0 &lt;&lt; 1 &lt;&lt; 2 &lt;&lt; 3 &lt;&lt; 4 &lt;&lt; 5 &lt;&lt; 6;
    *set1 &lt;&lt; 5 &lt;&lt; 0 &lt;&lt; 0 &lt;&lt; 4 &lt;&lt; 0 &lt;&lt; 7;
    *set2 &lt;&lt; 3 &lt;&lt; 5 &lt;&lt; 8 &lt;&lt; 13 &lt;&lt; 8 &lt;&lt; 5;
    *set3 &lt;&lt; 5 &lt;&lt; 6 &lt;&lt; 7 &lt;&lt; 3 &lt;&lt; 4 &lt;&lt; 5;
    *set4 &lt;&lt; 9 &lt;&lt; 7 &lt;&lt; 5 &lt;&lt; 3 &lt;&lt; 1 &lt;&lt; 2;

    QBarSeries *series = new QBarSeries();
    series-&gt;append(set0);
    series-&gt;append(set1);
    series-&gt;append(set2);
    series-&gt;append(set3);
    series-&gt;append(set4);


    QChart *chart = new QChart();
    chart-&gt;addSeries(series);
    chart-&gt;setTitle("Simple barchart example");
    chart-&gt;setAnimationOptions(QChart::SeriesAnimations);

    QStringList categories;
    categories &lt;&lt; "Jan" &lt;&lt; "Feb" &lt;&lt; "Mar" &lt;&lt; "Apr" &lt;&lt; "May" &lt;&lt; "Jun";
    QBarCategoryAxis *axisX = new QBarCategoryAxis();
    axisX-&gt;append(categories);
    chart-&gt;addAxis(axisX, Qt::AlignBottom);
    series-&gt;attachAxis(axisX);

    QValueAxis *axisY = new QValueAxis();
    axisY-&gt;setRange(0,15);
    chart-&gt;addAxis(axisY, Qt::AlignLeft);
    series-&gt;attachAxis(axisY);

    chart-&gt;legend()-&gt;setVisible(true);
    chart-&gt;legend()-&gt;setAlignment(Qt::AlignBottom);

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

    QMainWindow window;
    window.setCentralWidget(chartView);
    window.resize(420, 300);
    window.show();

    return a.exec();
}
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