void Plot::populate()
{
// Insert new curves
QwtPlotCurve *cSin = new QwtPlotCurve( "y = sin(x)" );
cSin->setRenderHint( QwtPlotItem::RenderAntialiased );
cSin->setLegendAttribute( QwtPlotCurve::LegendShowLine, true );
cSin->setPen( Qt::red );
cSin->attach( this );
cSin->setData( new Data() );
CurveTracker* tracker = new CurveTracker( 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" ) );
}
Plot::Plot( QWidget *parent ):
QwtPlot( parent)
{
setPalette( Qt::black );
// we want to have the axis scales like a frame around the
// canvas
plotLayout()->setAlignCanvasToScales( true );
for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
axisWidget( axis )->setMargin( 0 );
QwtPlotCanvas *canvas = new QwtPlotCanvas();
canvas->setAutoFillBackground( false );
canvas->setFrameStyle( QFrame::NoFrame );
setCanvas( canvas );
setAxisScale( QwtPlot::yLeft, 0.0, 10.0 );
// a title
QwtText title( "Picker Demo" );
title.setColor( Qt::white );
title.setRenderFlags( Qt::AlignHCenter | Qt::AlignTop );
QFont font;
font.setBold( true );
title.setFont( font );
QwtPlotTextLabel *titleItem = new QwtPlotTextLabel();
titleItem->setText( title );
titleItem->attach( this );
#if 1
// section
//QColor c( "PaleVioletRed" );
QwtPlotZoneItem* zone = new QwtPlotZoneItem();
zone->setPen( Qt::darkGray );
zone->setBrush( QColor( "#834358" ) );
zone->setOrientation( Qt::Horizontal );
zone->setInterval( 3.8, 5.7 );
zone->attach( this );
#else
// grid
QwtPlotGrid *grid = new QwtPlotGrid();
grid->setMajorPen( Qt::white, 0, Qt::DotLine );
grid->setMinorPen( Qt::gray, 0 , Qt::DotLine );
grid->attach( this );
#endif
// curves
QPolygonF points1;
points1 << QPointF( 0.2, 4.4 ) << QPointF( 1.2, 3.0 )
<< QPointF( 2.7, 4.5 ) << QPointF( 3.5, 6.8 )
<< QPointF( 4.7, 7.9 ) << QPointF( 5.8, 7.1 );
insertCurve( "Curve 1", "DarkOrange", points1 );
QPolygonF points2;
points2 << QPointF( 0.4, 8.7 ) << QPointF( 1.4, 7.8 )
<< QPointF( 2.3, 5.5 ) << QPointF( 3.3, 4.1 )
<< QPointF( 4.4, 5.2 ) << QPointF( 5.6, 5.7 );
insertCurve( "Curve 2", "DodgerBlue", points2 );
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" ) );
}