Scale brush content for printing. Adresses ticket #454. Works for ps, but not for pdf output. A qt bug?

git-svn-id: http://svn.osgeo.org/qgis/trunk@9281 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: mhugent

src/core/renderer/qgsgraduatedsymbolrenderer.cpp

@@ -141,17 +141,28 @@ void QgsGraduatedSymbolRenderer::renderFeature( QPainter * p, QgsFeature & f, QI
       QPen pen = theSymbol->pen();
       pen.setWidthF( widthScale * pen.widthF() );
       p->setPen( pen );
-      p->setBrush( theSymbol->brush() );
+
+      if(mVectorType == QGis::Polygon)
+	{
+	  QBrush brush = theSymbol->brush();
+	  scaleBrush(brush, rasterScaleFactor); //scale brush content for printout
+	  p->setBrush(brush);
+	}
     }
     else
     {
       QPen pen = theSymbol->pen();
       pen.setColor( mSelectionColor );
       pen.setWidthF( widthScale * pen.widthF() );
-      QBrush brush = theSymbol->brush();
-      brush.setColor( mSelectionColor );
       p->setPen( pen );
-      p->setBrush( brush );
+
+      if(mVectorType == QGis::Polygon)
+	{
+	  QBrush brush = theSymbol->brush();
+	  scaleBrush(brush, rasterScaleFactor); //scale brush content for printout
+	  brush.setColor( mSelectionColor );
+	  p->setBrush( brush );
+	}
     }
   }
 }

src/core/renderer/qgsrenderer.cpp

@@ -17,7 +17,9 @@
  ***************************************************************************/
 #include "qgsrenderer.h"
 
+#include <QBrush>
 #include <QColor>
+#include <QMatrix>
 #include <QString>
 
 
@@ -48,3 +50,13 @@ bool QgsRenderer::containsPixmap() const
       return false;
   }
 }
+
+void QgsRenderer::scaleBrush(QBrush& b, double rasterScaleFactor) const
+{
+  if(rasterScaleFactor != 1.0)
+    {
+      QMatrix m;
+      m.scale(1.0 / rasterScaleFactor, 1.0 / rasterScaleFactor);
+      b.setMatrix(m);
+    }
+}

src/core/renderer/qgsrenderer.h

@@ -30,6 +30,7 @@ class QColor;
 #include <QList>
 
 class QgsSymbol;
+class QBrush;
 
 typedef QList<int> QgsAttributeList;
 
@@ -93,6 +94,9 @@ class CORE_EXPORT QgsRenderer
 
     /**Layer type*/
     QGis::VectorType mVectorType;
+
+    /**Scales a brush to a given raster scale factor (e.g. for printing)*/
+    void scaleBrush(QBrush& b, double rasterScaleFactor) const;
 };
 
 #endif // QGSRENDERER_H

src/core/renderer/qgssinglesymbolrenderer.cpp

@@ -125,7 +125,13 @@ void QgsSingleSymbolRenderer::renderFeature( QPainter * p, QgsFeature & f, QImag
       QPen pen = mSymbol->pen();
       pen.setWidthF( widthScale * pen.widthF() );
       p->setPen( pen );
-      p->setBrush( mSymbol->brush() );
+
+      if(mVectorType == QGis::Polygon)
+	{
+	  QBrush brush = mSymbol->brush();
+	  scaleBrush(brush, rasterScaleFactor); //scale brush content for printout
+	  p->setBrush(brush);
+	}
     }
     else
     {
@@ -134,10 +140,15 @@ void QgsSingleSymbolRenderer::renderFeature( QPainter * p, QgsFeature & f, QImag
       // We set pen color in case it is an area with no brush (transparent).
       // Previously, this was only done for lines. Why?
       pen.setColor( mSelectionColor );
-      QBrush brush = mSymbol->brush();
-      brush.setColor( mSelectionColor );
       p->setPen( pen );
-      p->setBrush( brush );
+
+      if(mVectorType == QGis::Polygon)
+	{
+	  QBrush brush = mSymbol->brush();
+	  scaleBrush(brush, rasterScaleFactor); //scale brush content for printout
+	  brush.setColor( mSelectionColor );
+	  p->setBrush( brush );
+	}
     }
   }
 }

src/core/renderer/qgsuniquevaluerenderer.cpp

@@ -150,17 +150,26 @@ void QgsUniqueValueRenderer::renderFeature( QPainter* p, QgsFeature& f, QImage*
       QPen pen = symbol->pen();
       pen.setWidthF( widthScale * pen.widthF() );
       p->setPen( pen );
-      p->setBrush( symbol->brush() );
+      if(mVectorType == QGis::Polygon)
+	{
+	  QBrush brush = symbol->brush();
+	  scaleBrush(brush, rasterScaleFactor); //scale brush content for printout
+	  p->setBrush(brush);
+	}
     }
     else
     {
       QPen pen = symbol->pen();
       pen.setWidthF( widthScale * pen.widthF() );
       pen.setColor( mSelectionColor );
-      QBrush brush = symbol->brush();
-      brush.setColor( mSelectionColor );
       p->setPen( pen );
-      p->setBrush( brush );
+      if(mVectorType == QGis::Polygon)
+	{
+	  QBrush brush = symbol->brush();
+	  scaleBrush(brush, rasterScaleFactor); //scale brush content for printout
+	  brush.setColor( mSelectionColor );
+	  p->setBrush( brush );
+	}
     }
   }
 }