QgsRenderContext QgsRenderContext::fromMapSettings( const QgsMapSettings &mapSettings )
{
QgsRenderContext ctx;
ctx.setMapToPixel( mapSettings.mapToPixel() );
ctx.setExtent( mapSettings.visibleExtent() );
ctx.setFlag( DrawEditingInfo, mapSettings.testFlag( QgsMapSettings::DrawEditingInfo ) );
ctx.setFlag( ForceVectorOutput, mapSettings.testFlag( QgsMapSettings::ForceVectorOutput ) );
ctx.setFlag( UseAdvancedEffects, mapSettings.testFlag( QgsMapSettings::UseAdvancedEffects ) );
ctx.setFlag( UseRenderingOptimization, mapSettings.testFlag( QgsMapSettings::UseRenderingOptimization ) );
ctx.setCoordinateTransform( QgsCoordinateTransform() );
ctx.setSelectionColor( mapSettings.selectionColor() );
ctx.setFlag( DrawSelection, mapSettings.testFlag( QgsMapSettings::DrawSelection ) );
ctx.setFlag( DrawSymbolBounds, mapSettings.testFlag( QgsMapSettings::DrawSymbolBounds ) );
ctx.setFlag( RenderMapTile, mapSettings.testFlag( QgsMapSettings::RenderMapTile ) );
ctx.setFlag( Antialiasing, mapSettings.testFlag( QgsMapSettings::Antialiasing ) );
ctx.setFlag( RenderPartialOutput, mapSettings.testFlag( QgsMapSettings::RenderPartialOutput ) );
ctx.setScaleFactor( mapSettings.outputDpi() / 25.4 ); // = pixels per mm
ctx.setRendererScale( mapSettings.scale() );
ctx.setExpressionContext( mapSettings.expressionContext() );
ctx.setSegmentationTolerance( mapSettings.segmentationTolerance() );
ctx.setSegmentationToleranceType( mapSettings.segmentationToleranceType() );
ctx.mDistanceArea.setSourceCrs( mapSettings.destinationCrs() );
ctx.mDistanceArea.setEllipsoid( mapSettings.ellipsoid() );
//this flag is only for stopping during the current rendering progress,
//so must be false at every new render operation
ctx.setRenderingStopped( false );
return ctx;
}
