QCustomPlot的用法

最新推荐文章于 2025-03-10 09:00:00 发布

skyCastle_

最新推荐文章于 2025-03-10 09:00:00 发布

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本文链接：https://blog.youkuaiyun.com/skyCastle_/article/details/54426140

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本文介绍如何使用QCustomPlot在Qt应用程序中绘制多条曲线，并展示如何设置曲线名称、自适应轴、显示图例及启用交互操作。

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#include <QApplication>

#include <QLabel>
#include <QLineEdit>
#include <QGridLayout>
#include <QWidget>
#include <qcustomplot.h>
#include <QMainWindow>
#include <QDebug>

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

    
    //得到数据
    QVector<double> x(5),y0(5),y1(5),y2(5);
    for(int i=0;i<5;i++){
        x[i]=i;
        y0[i]=i+10;
        y1[i]=i+20;
        y2[i]=i+50;
    }

    //创建QCustomPlot,添加曲线graph,并设置曲线的数据
    QCustomPlot *customPlot=new QCustomPlot;
    customPlot->addGraph();
    customPlot->graph(0)->setName("fist line");
    customPlot->graph(0)->setData(x,y0);

    customPlot->addGraph();
    customPlot->graph(1)->setName("second line");
    customPlot->graph(1)->setData(x,y1);

    customPlot->addGraph();
    customPlot->graph(2)->setName("third line");
    customPlot->graph(2)->setData(x,y2);

    //自适应轴
    customPlot->graph(0)->rescaleAxes(true);
    customPlot->graph(1)->rescaleAxes(true);
    customPlot->graph(2)->rescaleAxes(true);

    //显示铭文
    customPlot->legend->setVisible(true);

    //设置customPlot可进行拽托或伸缩
    customPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom);
    customPlot->axisRect()->setRangeDrag(Qt::Horizontal);  //设置允许在某一方向上拽托
    customPlot->axisRect()->setRangeZoom(Qt::Horizontal);  //设置允许在某一方向上伸缩

    QMainWindow window;
    window.setCentralWidget(customPlot);
    window.resize(500,300);
    window.show();
    

/*
    //得到数据
    QVector<double> x(8),y(8);
    for(int i=0;i<8;i++){
        x[i]=i;
        y[i]=i*i;
    }

    //创建QCustomPlot,添加曲线graph,并设置曲线的数据
    QCustomPlot *customPlot=new QCustomPlot;
    customPlot->addGraph();
    customPlot->graph(0)->setName("fist line");
    customPlot->graph(0)->setData(x,y);

    //设置轴
    QSharedPointer<QCPAxisTickerText> textTicker(new QCPAxisTickerText);
    textTicker->addTick(1.0, "Bacteria");
    textTicker->addTick(2.0, "Protozoa");
    textTicker->addTick(3.0, "Chromista");
    textTicker->addTick(4.0, "Plants");
    textTicker->addTick(5.0, "Fungi");
    textTicker->addTick(6.0, "Animals");
    textTicker->addTick(8.0, "Vogons");

    customPlot->xAxis->setTicker(textTicker);

    //自适应轴
    customPlot->graph(0)->rescaleAxes(true);

    //显示铭文
    customPlot->legend->setVisible(true);

    //设置customPlot可进行拽托或放大
    customPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom);

    QMainWindow window;
    window.setCentralWidget(customPlot);
    window.resize(500,300);
    window.show();
*/

    return app.exec();
}