Qt数据可视化QChart - QScatterSeries散点图（点击操作）

千笺客

已于 2025-03-29 16:57:48 修改

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分类专栏： Qt 文章标签： qt

于 2022-09-26 18:10:02 首次发布

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本文介绍了一个使用 Qt Charts 模块创建散点图的示例程序。该程序展示了如何通过 Qt Charts 库创建两个散点系列，并实现点击删除当前散点系列中的点并将其添加到另一个散点系列的功能。

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注意：必须使用命名空间：QT_CHARTS_USE_NAMESPACE

如图：

代码：

#include <QApplication>
#include <QMainWindow>
#include <QChartView>
#include <QChart>
#include <QScatterSeries>
#include <QPainter>
#include <QtMath>
#include <QImage>
#include <QObject>

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

    QScatterSeries *series1 = new QScatterSeries();
    series1->setName("scatter1");
    series1->setMarkerShape(QScatterSeries::MarkerShapeCircle);
    series1->setMarkerSize(10.0);

    for(qreal x(0.1);x<=8.0;x+=0.3)
    {
        for(qreal y(0.1);y<4.0;y+=0.3)
        {
            *series1 << QPointF(x,y);
        }
    }

    QScatterSeries *series2 = new QScatterSeries();
    series2->setName("scatter2");
    series2->setMarkerShape(QScatterSeries::MarkerShapeCircle);
    series2->setMarkerSize(10.0);


    QChart *chart = new QChart();
    chart->addSeries(series1);
    chart->addSeries(series2);
    chart->setTitle("散点单击展示");
    chart->legend()->setMarkerShape(QLegend::MarkerShapeFromSeries);
    chart->createDefaultAxes();
    chart->axes(Qt::Vertical).first()->setRange(0,4);
    chart->axes(Qt::Horizontal).first()->setRange(0,8);
    chart->setAnimationOptions(QChart::SeriesAnimations);
    chart->setDropShadowEnabled(false);

    /* 图例 */
    chart->legend()->setVisible(true);              // 是否显示
    chart->legend()->setAlignment(Qt::AlignBottom); // 显示位置

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

    QObject::connect(series1,&QScatterSeries::clicked,chartView,[=](const QPointF &point){
        QPointF clickedPoint = point;
        
        QPointF closest(INT_MAX, INT_MAX);
        qreal distance(INT_MAX);
        const auto points = series1->points();
        for (const QPointF &currentPoint : points) {
            qreal currentDistance = qSqrt((currentPoint.x() - clickedPoint.x())
                                          * (currentPoint.x() - clickedPoint.x())
                                          + (currentPoint.y() - clickedPoint.y())
                                          * (currentPoint.y() - clickedPoint.y()));
            if (currentDistance < distance) {
                distance = currentDistance;
                closest = currentPoint;
            }
        }

        series1->remove(closest);
        series2->append(closest);
    });

    QMainWindow  window;
    window.setWindowTitle("散点单击展示实例");
    window.setCentralWidget(chartView);
    window.resize(600,300);
    window.show();
    return a.exec();
}