Qt4中,可以使用QCustompPlot来绘制曲线,QCustompPlot是一个第三方工具,可以到官网下载:http://www.qcustomplot.com/index.php/download
mainwindow.cpp代码如下:
这里实现一个实时动态曲线图,用随机数作为实时数据,程序运行结果如下:
主机环境:fedora9,Qt4.7,Qtcreator
2.0.1
使用Qtcreator 2.0.1新建一个工程,基类模板选择QMainWindow。将解压得到的QCustompPlot文件夹里面的头文件qcustomplot.h和源文件qcustomplot.cpp复制粘贴到工程文件夹下。在Qtcreator中,对着工程名右键,添加已有文件,将头文件qcustomplot.h和源文件qcustomplot.cpp都添加到工程中来。
在界面上拖拽一个widget部件,然后升级成Qcustomplot,(参考:http://www.bubuko.com/infodetail-744744.html)部件名称改为customPlot
mainwindow.h代码如下:
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#ifndef MAINWINDOW_H
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#define MAINWINDOW_H
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#include <QMainWindow>
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#include <QTimer>
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#include "qcustomplot.h"
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namespace Ui {
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class MainWindow;
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}
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class MainWindow : public QMainWindow
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{
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Q_OBJECT
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public:
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explicit MainWindow(QWidget *parent = 0);
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~MainWindow();
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//设置qcustomplot画图属性,实时
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void setupRealtimeDataDemo(QCustomPlot *customPlot);
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private slots:
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//添加实时数据槽
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void realtimeDataSlot();
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private:
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Ui::MainWindow *ui;
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//定时器,周期调用realtimeDataSlot()槽,实现动态数据添加到曲线
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QTimer dataTimer;
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};
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- #endif // MAINWINDOW_H
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#include "mainwindow.h"
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#include "ui_mainwindow.h"
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#include <QVector>
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#include <QTimer>
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#include <QTime>
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MainWindow::MainWindow(QWidget *parent) :
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QMainWindow(parent),
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ui(new Ui::MainWindow)
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{
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ui->setupUi(this);
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setupRealtimeDataDemo(ui->customPlot);
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ui->customPlot->replot();
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ui->checkBox_temp->setChecked(true);
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ui->checkBox_hui->setChecked(true);
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}
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MainWindow::~MainWindow()
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{
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delete ui;
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}
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//画图初始化
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void MainWindow::setupRealtimeDataDemo(QCustomPlot *customPlot)
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{
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//#if QT_VERSION < QT_VERSION_CHECK(4, 7, 0)
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//QMessageBox::critical(this, "", "You're
using Qt < 4.7, the realtime data demo needs functions that are available with Qt 4.7 to work properly");
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//#endif
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//demoName = "Real
Time Data Demo";
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// include this section to fully disable antialiasing for higher
performance:
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/*
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customPlot->setNotAntialiasedElements(QCP::aeAll);
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QFont font;
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font.setStyleStrategy(QFont::NoAntialias);
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customPlot->xAxis->setTickLabelFont(font);
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customPlot->yAxis->setTickLabelFont(font);
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customPlot->legend->setFont(font);
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*/
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customPlot->addGraph(); // blue
line
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customPlot->graph(0)->setPen(QPen(Qt::blue));
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customPlot->graph(0)->setName("temp");
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//customPlot->graph(0)->setBrush(QBrush(QColor(240, 255, 200)));
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//customPlot->graph(0)->setAntialiasedFill(false);
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customPlot->addGraph(); // red
line
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customPlot->graph(1)->setPen(QPen(Qt::red));
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customPlot->graph(1)->setName("hui");
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//customPlot->graph(0)->setChannelFillGraph(customPlot->graph(1));
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customPlot->xAxis->setTickLabelType(QCPAxis::ltDateTime);
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customPlot->xAxis->setDateTimeFormat("hh:mm:ss");
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customPlot->xAxis->setAutoTickStep(false);
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customPlot->xAxis->setTickStep(2);
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customPlot->axisRect()->setupFullAxesBox();
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// make left and bottom
axes transfer their ranges to right and top axes:
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//connect(customPlot->xAxis, SIGNAL(rangeChanged(QCPRange)), customPlot->xAxis2, SLOT(setRange(QCPRange)));
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//connect(customPlot->yAxis, SIGNAL(rangeChanged(QCPRange)), customPlot->yAxis2, SLOT(setRange(QCPRange)));
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// setup a timer that repeatedly calls MainWindow::realtimeDataSlot:
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connect(&dataTimer, SIGNAL(timeout()), this, SLOT(realtimeDataSlot()));
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dataTimer.start(0); // Interval
0 means to refresh as fast as possible
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customPlot->legend->setVisible(true);
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}
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void MainWindow::realtimeDataSlot()
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{
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//key的单位是秒
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double key = QDateTime::currentDateTime().toMSecsSinceEpoch()/1000.0;
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qsrand(QTime::currentTime().msec() + QTime::currentTime().second() * 10000);
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//使用随机数产生两条曲线
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double value0 = qrand() % 100;
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double value1 = qrand() % 80;
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if (ui->checkBox_temp->isChecked())
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ui->customPlot->graph(0)->addData(key, value0);//添加数据1到曲线1
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if (ui->checkBox_hui->isChecked())
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ui->customPlot->graph(1)->addData(key, value1);//添加数据2到曲线2
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//删除8秒之前的数据。这里的8要和下面设置横坐标宽度的8配合起来
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//才能起到想要的效果,可以调整这两个值,观察显示的效果。
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ui->customPlot->graph(0)->removeDataBefore(key-8);
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ui->customPlot->graph(1)->removeDataBefore(key-8);
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//自动设定graph(1)曲线y轴的范围,如果不设定,有可能看不到图像
//也可以用ui->customPlot->yAxis->setRange(up,low)手动设定y轴范围
//也可以用ui->customPlot->yAxis->setRange(up,low)手动设定y轴范围
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ui->customPlot->graph(0)->rescaleValueAxis();
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ui->customPlot->graph(1)->rescaleValueAxis(true);
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//这里的8,是指横坐标时间宽度为8秒,如果想要横坐标显示更多的时间
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//就把8调整为比较大到值,比如要显示60秒,那就改成60。
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//这时removeDataBefore(key-8)中的8也要改成60,否则曲线显示不完整。
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ui->customPlot->xAxis->setRange(key+0.25, 8, Qt::AlignRight);//设定x轴的范围
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ui->customPlot->replot();
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转载自QCustomPlot实现实时动态曲线-stuyou-ChinaUnix博客 http://blog.chinaunix.net/uid-11829250-id-5750296.html