/*!
Draw the shape item
\param painter Painter
\param xMap X-Scale Map
\param yMap Y-Scale Map
\param canvasRect Contents rect of the plot canvas
*/
void QwtPlotShapeItem::draw( QPainter *painter,
const QwtScaleMap &xMap, const QwtScaleMap &yMap,
const QRectF &canvasRect ) const
{
if ( d_data->shape.isEmpty() )
return;
if ( d_data->pen.style() == Qt::NoPen
&& d_data->brush.style() == Qt::NoBrush )
{
return;
}
const QRectF cRect = QwtScaleMap::invTransform(
xMap, yMap, canvasRect.toRect() );
if ( d_data->boundingRect.intersects( cRect ) )
{
const bool doAlign = QwtPainter::roundingAlignment( painter );
QPainterPath path = qwtTransformPath( xMap, yMap,
d_data->shape, doAlign );
if ( testPaintAttribute( QwtPlotShapeItem::ClipPolygons ) )
{
qreal pw = qMax( qreal( 1.0 ), painter->pen().widthF());
QRectF clipRect = canvasRect.adjusted( -pw, -pw, pw, pw );
QPainterPath clippedPath;
clippedPath.setFillRule( path.fillRule() );
const QList<QPolygonF> polygons = path.toSubpathPolygons();
for ( int i = 0; i < polygons.size(); i++ )
{
const QPolygonF p = QwtClipper::clipPolygonF(
clipRect, polygons[i], true );
clippedPath.addPolygon( p );
}
path = clippedPath;
}
if ( d_data->renderTolerance > 0.0 )
{
QwtWeedingCurveFitter fitter( d_data->renderTolerance );
QPainterPath fittedPath;
fittedPath.setFillRule( path.fillRule() );
const QList<QPolygonF> polygons = path.toSubpathPolygons();
for ( int i = 0; i < polygons.size(); i++ )
fittedPath.addPolygon( fitter.fitCurve( polygons[ i ] ) );
path = fittedPath;
}
painter->setPen( d_data->pen );
painter->setBrush( d_data->brush );
painter->drawPath( path );
}
}
/*!
Draw the shape item
\param painter Painter
\param xMap X-Scale Map
\param yMap Y-Scale Map
\param canvasRect Contents rect of the plot canvas
*/
void QwtPlotShapeItem::draw( QPainter *painter,
const QwtScaleMap &xMap, const QwtScaleMap &yMap,
const QRectF &canvasRect ) const
{
if ( d_data->shape.isEmpty() )
return;
if ( d_data->pen.style() == Qt::NoPen
&& d_data->brush.style() == Qt::NoBrush )
{
return;
}
const QRectF cr = QwtScaleMap::invTransform(
xMap, yMap, canvasRect.toRect() );
const QRectF &br = d_data->boundingRect;
if ( ( br.left() > cr.right() ) || ( br.right() < cr.left() )
|| ( br.top() > cr.bottom() ) || ( br.bottom() < cr.top() ) )
{
// outside the visisble area
return;
}
const bool doAlign = QwtPainter::roundingAlignment( painter );
QPainterPath path = qwtTransformPath( xMap, yMap,
d_data->shape, doAlign );
if ( testPaintAttribute( QwtPlotShapeItem::ClipPolygons ) )
{
const qreal pw = QwtPainter::effectivePenWidth( painter->pen() );
const QRectF clipRect = canvasRect.adjusted( -pw, -pw, pw, pw );
QPainterPath clippedPath;
clippedPath.setFillRule( path.fillRule() );
QList<QPolygonF> polygons = path.toSubpathPolygons();
for ( int i = 0; i < polygons.size(); i++ )
{
QwtClipper::clipPolygonF( clipRect, polygons[i], true );
clippedPath.addPolygon( polygons[i] );
}
path = clippedPath;
}
if ( d_data->renderTolerance > 0.0 )
{
QwtWeedingCurveFitter fitter( d_data->renderTolerance );
QPainterPath fittedPath;
fittedPath.setFillRule( path.fillRule() );
const QList<QPolygonF> polygons = path.toSubpathPolygons();
for ( int i = 0; i < polygons.size(); i++ )
fittedPath.addPolygon( fitter.fitCurve( polygons[ i ] ) );
path = fittedPath;
}
painter->setPen( d_data->pen );
painter->setBrush( d_data->brush );
painter->drawPath( path );
}
