10 Nisan 2018 Salı

QWT3 Canvasa Dikey Çizgi ile Koordinat takibi Yapmak (Curve Travker - QwtPlotPicker)

on   
    CurveTracker* tracker = new CurveTracker( this->canvas() );


    // for the demo we want the tracker to be active without


    // having to click on the canvas


    tracker->setStateMachine( new QwtPickerTrackerMachine() );




    tracker->setRubberBandPen( QPen( "MediumOrchid" ) );








Nesne Boyama ve sembl 




    QwtPlot plot;


    plot.setTitle( "Plot Demo" );


    plot.setCanvasBackground( Qt::white );


    plot.setAxisScale( QwtPlot::xBottom, 0.0, 6.0 );// yatay x ekseni degerleri 1-6 arasıdır


    QwtLegend *legend = new QwtLegend();   // kateogoriler tanımlanıyor


    legend->setDefaultItemMode( QwtLegendData::Checkable );  // kategoriler tıklanabilir


    plot.insertLegend( legend );     // kategoriler plota ekleniyor




    


    QwtPlotCurve *curve = new QwtPlotCurve(); // boyama nesnesi olusturuluyor


    curve->setRenderHint( QwtPlotItem::RenderAntialiased, true );


    curve->setPen( Qt::blue );


    QBrush brush;


    QwtSymbol::Style style = QwtSymbol::NoSymbol;


    QString title;


    


    MySymbol *symbol = new MySymbol( style, brush );




    curve->setSymbol( symbol );


    curve->setTitle( title );


    curve->setLegendAttribute( QwtPlotCurve::LegendShowSymbol, true );


    curve->setLegendIconSize( QSize( 15, 18 ) );




    QPolygonF points;


    points << QPointF( 0.0, 1 ) << QPointF( 1, 1 )


        << QPointF( 1, 2 ) << QPointF( 2, 2 )


        << QPointF( 2, 3) << QPointF( 20,20);




   points.translate( 0.0, i * 2.0 );




    curve->setSamples( points );


    curve->attach( &plot );





















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