void QgsVectorLayerDiagramProvider::drawLabel( QgsRenderContext& context, pal::LabelPosition* label ) const
{
#if 1 // XXX strk
// features are pre-rotated but not scaled/translated,
// so we only disable rotation here. Ideally, they'd be
// also pre-scaled/translated, as suggested here:
// http://hub.qgis.org/issues/11856
QgsMapToPixel xform = context.mapToPixel();
xform.setMapRotation( 0, 0, 0 );
#else
const QgsMapToPixel& xform = context.mapToPixel();
#endif
QgsDiagramLabelFeature* dlf = dynamic_cast<QgsDiagramLabelFeature*>( label->getFeaturePart()->feature() );
QgsFeature feature;
feature.setFields( mFields );
feature.setValid( true );
feature.setFeatureId( label->getFeaturePart()->featureId() );
feature.setAttributes( dlf->attributes() );
//calculate top-left point for diagram
//first, calculate the centroid of the label (accounts for PAL creating
//rotated labels when we do not want to draw the diagrams rotated)
double centerX = 0;
double centerY = 0;
for ( int i = 0; i < 4; ++i )
{
centerX += label->getX( i );
centerY += label->getY( i );
}
QgsPoint outPt( centerX / 4.0, centerY / 4.0 );
//then, calculate the top left point for the diagram with this center position
QgsPoint centerPt = xform.transform( outPt.x() - label->getWidth() / 2,
outPt.y() - label->getHeight() / 2 );
mSettings.getRenderer()->renderDiagram( feature, context, centerPt.toQPointF() );
//insert into label search tree to manipulate position interactively
mEngine->results()->mLabelSearchTree->insertLabel( label, label->getFeaturePart()->featureId(), mLayerId, QString(), QFont(), true, false );
}
