Qwt और Qt निर्माता। त्वरित और आसान। भाग 2: प्रदर्शन और नियंत्रण तत्व

 #ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QMainWindow> #include <qwt_plot.h> #include <qwt_plot_grid.h> #include <qwt_legend.h> #include <qwt_plot_curve.h> #include <qwt_symbol.h> #include <qwt_plot_magnifier.h> #include <qwt_plot_panner.h> #include <qwt_plot_picker.h> #include <qwt_picker_machine.h> namespace Ui { class MainWindow; } class MainWindow : public QMainWindow { Q_OBJECT public: explicit MainWindow(QWidget *parent = 0); ~MainWindow(); private: Ui::MainWindow *ui; QwtPlot *d_plot; void setPlot(); QwtPlotGrid *grid; void setPlotGrid(); QwtPlotCurve *curve; QwtSymbol *symbol; void setCurveParameters(); //     double pointArray[5][2]; QPolygonF points; void addPointsToCurveAndShow(); QwtPlotMagnifier *magnifier; void enableMagnifier(); QwtPlotPanner *d_panner; void enableMovingOnPlot(); QwtPlotPicker *d_picker; void enablePicker(); }; #endif // MAINWINDOW_H 

 #include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); //        setPlot(); //    setPlotGrid(); //  setCurveParameters(); addPointsToCurveAndShow(); //   /  enableMagnifier(); //      enableMovingOnPlot(); //        //      enablePicker(); } void MainWindow::setPlot() { // (this) -      // #include <qwt_plot.h> d_plot = new QwtPlot( this ); setCentralWidget(d_plot); //      d_plot->setTitle( "Qwt demonstration" ); //  d_plot->setCanvasBackground( Qt::white ); //   //    d_plot->setAxisTitle(QwtPlot::yLeft, "Y"); d_plot->setAxisTitle(QwtPlot::xBottom, "X"); d_plot->insertLegend( new QwtLegend() ); } void MainWindow::setPlotGrid() { // #include <qwt_plot_grid.h> grid = new QwtPlotGrid(); grid->setMajorPen(QPen( Qt::gray, 2 )); //     grid->attach( d_plot ); //      } void MainWindow::setCurveParameters() { //#include <qwt_plot_curve.h> curve = new QwtPlotCurve(); curve->setTitle( "Demo Curve" ); curve->setPen( Qt::blue, 6 ); //     curve->setRenderHint ( QwtPlotItem::RenderAntialiased, true ); //  //   // #include <qwt_symbol.h> symbol = new QwtSymbol( QwtSymbol::Ellipse, QBrush( Qt::yellow ), QPen( Qt::red, 2 ), QSize( 8, 8 ) ); curve->setSymbol( symbol ); } void MainWindow::addPointsToCurveAndShow() { //       //     ,   //    for (int i = 0; i < 5; i++) { pointArray[i][0] = 1.0 + 0.5*i; pointArray[i][1] = 1.0 + 0.5*i; points << QPointF( pointArray[i][0], pointArray[i][1]); } curve->setSamples( points ); //      curve->attach( d_plot ); //     } void MainWindow::enableMagnifier() { // #include <qwt_plot_magnifier.h> magnifier = new QwtPlotMagnifier(d_plot->canvas()); // ,  / magnifier->setMouseButton(Qt::MidButton); } void MainWindow::enableMovingOnPlot() { // #include <qwt_plot_panner.h> d_panner = new QwtPlotPanner( d_plot->canvas() ); // ,   d_panner->setMouseButton( Qt::RightButton ); } void MainWindow::enablePicker() { // #include <qwt_plot_picker.h> //   d_picker = new QwtPlotPicker( QwtPlot::xBottom, QwtPlot::yLeft, //    QwtPlotPicker::CrossRubberBand, //    QwtPicker::AlwaysOn, //   d_plot->canvas() ); //    //    d_picker->setRubberBandPen( QColor( Qt::red ) ); //     d_picker->setTrackerPen( QColor( Qt::black ) ); //     d_picker->setStateMachine( new QwtPickerDragPointMachine() ); } MainWindow::~MainWindow() { delete ui; }