用QCustomPlot画x轴单位是时间且实时变化的动态图

来源：互联网发布：js window对象用不了编辑：程序博客网时间：2024/05/20 04:09

转载自http://blog.chinaunix.net/uid-11829250-id-5750296.html

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMainWindow>#include <QTimer>#include "qcustomplot.h"namespace Ui {    class MainWindow;}class MainWindow : public QMainWindow{    Q_OBJECTpublic:    explicit MainWindow(QWidget *parent = 0);    ~MainWindow();    //设置qcustomplot画图属性，实时    void setupRealtimeDataDemo(QCustomPlot *customPlot);private slots:    //添加实时数据槽    void realtimeDataSlot();private:    Ui::MainWindow *ui;    //定时器，周期调用realtimeDataSlot()槽，实现动态数据添加到曲线    QTimer dataTimer;};#endif // MAINWINDOW_H

#include "mainwindow.h"#include "ui_mainwindow.h"#include <QVector>#include <QTimer>#include <QTime>/* *了解x坐标轴的方法，添加数据的方式 **/MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow){    ui->setupUi(this);    setupRealtimeDataDemo(ui->customPlot);    ui->customPlot->replot();    ui->checkBox_temp->setChecked(true);    ui->checkBox_hui->setChecked(true);}MainWindow::~MainWindow(){    delete ui;}//画图初始化void MainWindow::setupRealtimeDataDemo(QCustomPlot *customPlot){  customPlot->addGraph(); // blue line  customPlot->graph(0)->setPen(QPen(Qt::blue));  customPlot->graph(0)->setName("temp");  //customPlot->graph(0)->setBrush(QBrush(QColor(240, 255, 200)));  //customPlot->graph(0)->setAntialiasedFill(false);  customPlot->addGraph(); // red line  customPlot->graph(1)->setPen(QPen(Qt::red));  customPlot->graph(1)->setName("hui");  //customPlot->graph(0)->setChannelFillGraph(customPlot->graph(1));  customPlot->xAxis->setTickLabelType(QCPAxis::ltDateTime);  customPlot->xAxis->setDateTimeFormat("hh:mm:ss");  customPlot->xAxis->setAutoTickStep(false);  customPlot->xAxis->setTickStep(2);  customPlot->axisRect()->setupFullAxesBox();  // make left and bottom axes transfer their ranges to right and top axes:  //connect(customPlot->xAxis, SIGNAL(rangeChanged(QCPRange)), customPlot->xAxis2, SLOT(setRange(QCPRange)));  //connect(customPlot->yAxis, SIGNAL(rangeChanged(QCPRange)), customPlot->yAxis2, SLOT(setRange(QCPRange)));  // setup a timer that repeatedly calls MainWindow::realtimeDataSlot:  connect(&dataTimer, SIGNAL(timeout()), this, SLOT(realtimeDataSlot()));  dataTimer.start(0); // Interval 0 means to refresh as fast as possible  customPlot->legend->setVisible(true);}void MainWindow::realtimeDataSlot(){    //key的单位是秒    double key = QDateTime::currentDateTime().toMSecsSinceEpoch()/1000.0;    qsrand(QTime::currentTime().msec() + QTime::currentTime().second() * 10000);    //使用随机数产生两条曲线    double value0 = qrand() % 100;    double value1 = qrand() % 80;    if (ui->checkBox_temp->isChecked())        ui->customPlot->graph(0)->addData(key, value0);//添加数据1到曲线1    if (ui->checkBox_hui->isChecked())        ui->customPlot->graph(1)->addData(key, value1);//添加数据2到曲线2    //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    //才能起到想要的效果，可以调整这两个值，观察显示的效果。    ui->customPlot->graph(0)->removeDataBefore(key-8);    ui->customPlot->graph(1)->removeDataBefore(key-8);  //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    ui->customPlot->graph(0)->rescaleValueAxis();    ui->customPlot->graph(1)->rescaleValueAxis(true);    //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    //就把8调整为比较大到值，比如要显示60秒，那就改成60。    //这时removeDataBefore(key-8)中的8也要改成60，否则曲线显示不完整。    ui->customPlot->xAxis->setRange(key+0.25, 8, Qt::AlignRight);//设定x轴的范围    ui->customPlot->replot();}

已经说的很详细了，留作笔记

阅读全文

0 0