Qt工作笔记-QCustomPlot的基本使用

运行截图如下：

代码如下：

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

#include "qcustomplot.h"

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
    void timerEvent(QTimerEvent* event);


private:
    Ui::Widget *ui;

    QCPItemTracer *m_myPhaseTracer;
    QString m_myName;
    QVector<double> x,y;

    int m_timer;

};

#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"

#include <QDebug>
#include <math.h>
#include <QTime>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    x(100),
    y(100),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    m_myName="我的折线图";
    for(int i=0;i<100;i++){
        x[i]=i/50.0;
        y[i]=pow(x[i],3);
    }

    m_timer=startTimer(500);
    qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));

    ui->plot->addGraph();
    ui->plot->graph()->setData(x,y);
    ui->plot->setInteractions(QCP::iRangeDrag|QCP::iRangeZoom);
}

Widget::~Widget()
{
    delete ui;
}

void Widget::timerEvent(QTimerEvent* event){
    for(int i=0;i<100;i++){
        x[i]=i;
        y[i]=qrand()%100+1;
    }
    ui->plot->graph()->setData(x,y);
    ui->plot->replot();
}

main.cpp

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}