Qt中用qwt实现动态绘制二维曲线

#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); ui->centralWidget->setLayout(ui->horizontalLayout); connect(t,SIGNAL(timeout()),this,SLOT(dataPlot())); init_Plot(); } void MainWindow::init_Plot() { ui->qwtPlot->setTitle("Plot Demo"); ui->qwtPlot->setAxisTitle(QwtPlot::xBottom,"x"); ui->qwtPlot->setAxisScale(QwtPlot::xBottom,0,10,1); ui->qwtPlot->setAxisTitle(QwtPlot::yLeft,"y"); ui->qwtPlot->setAxisScale(QwtPlot::yLeft,0,30,5); ui->qwtPlot->setCanvasBackground(Qt::white); ui->qwtPlot->insertLegend(new QwtLegend(),QwtPlot::RightLegend); QwtPlotGrid *grid = new QwtPlotGrid(); grid->attach(ui->qwtPlot); curve1->setTitle("forse sensor"); curve1->setPen(Qt::blue,2); curve1->setRenderHint(QwtPlotItem::RenderAntialiased,true); curve1->attach(ui->qwtPlot); curve2->setTitle("MMG sensor"); curve2->setPen(Qt::red,2); curve2->setRenderHint(QwtPlotItem::RenderAntialiased,true); curve2->attach(ui->qwtPlot); QwtPlotMagnifier *magnifier = new QwtPlotMagnifier(ui->qwtPlot->canvas()); magnifier->setAxisEnabled(QwtPlot::yLeft,true); QwtPlotPanner *panner = new QwtPlotPanner(ui->qwtPlot->canvas()); panner->setAutoFillBackground(true); timeforPlot(); } void MainWindow::timeforPlot() { t->start(300); j = 0; } void MainWindow::dataPlot() { this->xData1.append(j); this->yData1.append(2*j); this->curve1->setSamples(xData1,yData1); this->xData2.append(j); this->yData2.append(2+j); this->curve2->setSamples(xData2,yData2); if(j>=10 && j <=30) { ui->qwtPlot->setAxisScale(QwtPlot::xBottom,j-10,j+1,1); } if(j>30) { ui->qwtPlot->setAxisScale(QwtPlot::xBottom,j-10,j+1,1); ui->qwtPlot->setAxisScale(QwtPlot::yLeft,j-30,31+2*j,5); } ui->qwtPlot->replot(); j++; } MainWindow::~MainWindow() { delete ui; }