Added option to disable mm units in maprenderer (e.g. for third party apps). Not yet exposed to GUI because of feature freeze

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@9283 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: mhugent

src/core/qgsmaprenderer.cpp

@@ -50,6 +50,8 @@ QgsMapRenderer::QgsMapRenderer()
 
   mProjectionsEnabled = FALSE;
   mDestCRS = new QgsCoordinateReferenceSystem( GEOEPSG_ID, QgsCoordinateReferenceSystem::EPSG ); //WGS 84
+
+  mOutputUnits = QgsMapRenderer::MM;
 }
 
 QgsMapRenderer::~QgsMapRenderer()
@@ -238,7 +240,11 @@ void QgsMapRenderer::render( QPainter* painter )
   //use the specified dpi and not those from the paint device
   //because sometimes QPainter units are in a local coord sys (e.g. in case of QGraphicsScene)
   double sceneDpi = mScaleCalculator->dpi();
-  double scaleFactor = sceneDpi / 25.4; //units should always be mm
+  double scaleFactor = 1.0;
+  if(mOutputUnits == QgsMapRenderer::MM)
+    {
+      scaleFactor = sceneDpi / 25.4;
+    }
   double rasterScaleFactor = ( thePaintDevice->logicalDpiX() + thePaintDevice->logicalDpiY() ) / 2.0 / sceneDpi;
   mRenderContext.setScaleFactor( scaleFactor );
   mRenderContext.setRasterScaleFactor( rasterScaleFactor );

src/core/qgsmaprenderer.h

@@ -44,6 +44,14 @@ class CORE_EXPORT QgsMapRenderer : public QObject
 
   public:
 
+  /**Output units for pen width and point marker width/height*/
+  enum OUTPUT_UNITS
+    {
+      MM,
+      PIXEL
+      //MAP_UNITS probably supported in future versions
+    };
+
     //! constructor
     QgsMapRenderer();
 
@@ -112,6 +120,10 @@ class CORE_EXPORT QgsMapRenderer : public QObject
     //! returns CRS ID of destination spatial reference system
     const QgsCoordinateReferenceSystem& destinationSrs();
 
+    void setOutputUnits(OUTPUT_UNITS u){mOutputUnits = u;}
+
+    OUTPUT_UNITS outputUnits() const {return mOutputUnits;}
+
     //! returns current extent of layer set
     QgsRect fullExtent();
 
@@ -205,6 +217,9 @@ class CORE_EXPORT QgsMapRenderer : public QObject
 
     //!Encapsulates context of rendering
     QgsRenderContext mRenderContext;
+
+    //!Output units
+    OUTPUT_UNITS mOutputUnits;
 };
 
 #endif