Use size scale also for line symbols to modify line width.

Developed for Faunalia (http://www.faunalia.it) with funding from Regione Toscana - Sistema Informativo per la Gestione del Territorio e dell' Ambiente [RT-SIGTA].
For the project: "Sviluppo di prodotti software GIS open-source basati sui prodotti QuantumGIS e Postgis (CIG 037728516E)"


git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@13947 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/core/symbology-ng/qgslinesymbollayerv2.cpp

@@ -102,6 +102,13 @@ void QgsSimpleLineSymbolLayerV2::renderPolyline( const QPolygonF& points, QgsSym
     return;
   }
 
+  if ( context.renderHints() & QgsSymbolV2::DataDefinedSizeScale )
+  {
+    double scaledWidth = context.outputLineWidth( mWidth );
+    mPen.setWidthF( scaledWidth );
+    mSelPen.setWidthF( scaledWidth );
+  }
+
   p->setPen( context.selected() ? mSelPen : mPen );
   if ( mOffset == 0 )
   {
@@ -250,8 +257,12 @@ void QgsMarkerLineSymbolLayerV2::startRender( QgsSymbolV2RenderContext& context
   mMarker->setOutputUnit( context.outputUnit() );
 
   // if being rotated, it gets initialized with every line segment
+  int hints = 0;
   if ( mRotateMarker )
-    mMarker->setRenderHints( QgsSymbolV2::DataDefinedRotation );
+    hints |= QgsSymbolV2::DataDefinedRotation;
+  if ( context.renderHints() & QgsSymbolV2::DataDefinedSizeScale )
+    hints |= QgsSymbolV2::DataDefinedSizeScale;
+  mMarker->setRenderHints( hints );
 
   mMarker->startRender( context.renderContext() );
 }