Qt QChart，利用QChart绘制动态曲线

这是一个简单的demo，在更新数据的时候我采用了官方中audio这个example的方式。

效果图

程序

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运行环境 ：

Qt Creator 4.2.1

Based on Qt 5.8.0 (MSVC 2015, 32 bit)

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QtChartsTest.pro

这个文件中唯一需要添加的是

QT += charts

其他可以不看

#-------------------------------------------------
#
# Project created by QtCreator 2017-07-11T10:12:57
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = QtChartsTest
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

QT += charts

mainwindow.h

这个文件声明了一个定时器的槽和一个获得数据的方法

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include 

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
protected:
    void timerEvent(QTimerEvent *event) Q_DECL_OVERRIDE;
private:
    Ui::MainWindow *ui;
    double getData(double time);

};

#endif // MAINWINDOW_H

mainwindow.cpp

主程序中配置好Qchart，QLineSeries是用来存放数据。更新的工作放在定时器的槽中。其中

m_series->setUseOpenGL(true);//openGl 加速

采用openGL加速，绘图速度加快

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "QtCharts/QChart"
#include "QLineSeries"
#include "QValueAxis"
#include "QTimer"
#include "QTime"
#include "QList"
#include "qmath.h"
#include "QPointF"
#include "QDebug"

//#include 
#include "QChartView"
QT_CHARTS_USE_NAMESPACE
QChart *m_chart;
QLineSeries *m_series;
//QList dataList;//存储业务数据
int maxSize = 5000;

//QTimer updateTimer;
int timeId;
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),//默认初始化？
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    m_chart = new QChart;
    QChartView *chartView = new QChartView(m_chart);
//    v.setRubberBand(QChartView::HorizontalRubberBand);
    chartView->setRubberBand(QChartView::RectangleRubberBand);
//    chartView->setRubberBand();

    m_series = new QLineSeries;
    m_chart->addSeries(m_series);

    for(int i=0;iappend(i,0);
    }
    m_series->setUseOpenGL(true);//openGl 加速
    qDebug()<useOpenGL();

    QValueAxis *axisX = new QValueAxis;
    axisX->setRange(0,maxSize);
    axisX->setLabelFormat("%g");
    axisX->setTitleText("axisX");

    QValueAxis *axisY = new QValueAxis;
    axisY->setRange(-1.5,1.5);
    axisY->setTitleText("axisY");

    m_chart->setAxisX(axisX,m_series);
    m_chart->setAxisY(axisY,m_series);
    m_chart->legend()->hide();
    m_chart->setTitle("demo");

    QVBoxLayout *layout = ui->verticalLayout;
    layout->addWidget(chartView);
    timeId = startTimer(30);
}


double MainWindow::getData(double time){

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

void MainWindow::timerEvent(QTimerEvent *event){
    if(event->timerId()==timeId){//定时器到时间,//模拟数据填充
        static QTime dataTime(QTime::currentTime());
        long int eltime = dataTime.elapsed();
        static int lastpointtime = 0;
        int size = (eltime - lastpointtime);//数据个数
        qDebug()<<"size-->"< oldPoints = m_series->pointsVector();//Returns the points in the series as a vector
            QVector points;

            for(int i=size;ireplace(points);
            lastpointtime = eltime;
       }
    }
}
MainWindow::~MainWindow()
{
    delete ui;
}

main.cpp

没什么好说的

#include "mainwindow.h"
#include 

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

    return a.exec();
}

mainwindow.ui

这个里自己放一个vertical Layout

这只是我根据别人的程序写的简单demo，有问题欢迎讨论。

demo文件：

链接：http://pan.baidu.com/s/1cKXtIQ 密码：5sm2