Qt 使用 qcustomplot 绘制曲线例子

发布网友发布时间：2022-12-17 16:41

共1个回答

热心网友时间：2023-10-03 05:48

源文件

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include "cwidgetcheckbox.h"

#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :

QMainWindow(parent),

ui(new Ui::MainWindow)

{

ui->setupUi(this);

m_pPlot = new QCustomPlot;

m_pPlot->setInteractions(QCP::iRangeDrag|QCP::iRangeZoom|QCP::iMultiSelect|QCP::iSelectOther|QCP::iSelectItems);

m_pPlot->axisRect()->setupFullAxesBox();

m_pPlot->xAxis->setLabel("时间");

m_pPlot->yAxis->setLabel("值");

m_pPlot->xAxis->setRange(0,30);

m_pPlot->yAxis->setRange(0,100);

m_pPlot->legend->setVisible(true);

//m_pPlot->graph( index )->setName(QString::fromStdString(nameVec[0][0]));

ui->verticalLayout->addWidget( m_pPlot );

m_id = startTimer(10);

m_line = m_pPlot->addGraph();

m_line->setName( tr("test") );

m_line->setPen(QPen(QColor(255,0,0)));

m_line->setScatterStyle(QCPScatterStyle::ssDisc);

m_index = 0;

}

MainWindow::~MainWindow()

{

delete ui;

}

double MainWindow::getData(double time)

{

double s = qCos( time * M_PI * 2 ) ;

return s;

}

void MainWindow::timerEvent(QTimerEvent *event)

{

int data = qrand()%20;

m_line->addData(m_index, data);

//m_line->addData(vecX,m_vetData);

m_pPlot->replot();

m_index++;

if( m_index > 31 )

{

m_pPlot->xAxis->setRange(m_index-30,m_index);

}

QMainWindow::timerEvent(event);

}

头文件

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include "qcustomplot.h"

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

Q_OBJECT

public:

explicit MainWindow(QWidget *parent = 0);

~MainWindow();

double getData(double time);

protected:

void timerEvent(QTimerEvent *event) Q_DECL_OVERRIDE;

//void timerEvent(QTimerEvent *event);

private slots:

private:

Ui::MainWindow *ui;

QCPGraph * m_line;

QCustomPlot * m_pPlot;

QVector m_vetData;

int m_index;

int m_id;

};

#endif // MAINWINDOW_H

热心网友时间：2023-10-03 05:48