- added possibility not to update rubberband when adding point

- improved performance of GRASS digitizing - canvas is updated only once instead of [number of points]-times


git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@5878 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/gui/qgsrubberband.cpp

@@ -65,12 +65,15 @@ void QgsRubberBand::reset(bool isPolygon)
 /*!
   Add a point to the shape being created.
 */
-void QgsRubberBand::addPoint(const QgsPoint & p)
+void QgsRubberBand::addPoint(const QgsPoint & p, bool update /* = true */)
 {
   mPoints[mPoints.size()-1] = p; // Current mouse position becomes added point
   mPoints.push_back(p); // Allocate new point to continue tracking current mouse position
-  updateRect();
-  updateCanvas();
+  if (update)
+  {
+    updateRect();
+    updateCanvas();
+  }
 }
 
 /*!
@@ -132,4 +135,5 @@ void QgsRubberBand::updateRect()
   }
 
   setVisible(mPoints.size() > 1);
-}
+}
+

src/gui/qgsrubberband.h

@@ -33,7 +33,11 @@ class QgsRubberBand: public QgsMapCanvasItem
     void setWidth(int width);
 
     void reset(bool isPolygon = false);
-    void addPoint(const QgsPoint & p);
+
+    //! Add point to rubberband and update canvas
+    //! If adding more points consider using update=false for better performance
+    void addPoint(const QgsPoint & p, bool update = true);
+
     void movePoint(const QgsPoint & p);
     void movePoint(int index, const QgsPoint& p);
 

src/plugins/grass/qgsgrassedit.cpp

@@ -1692,8 +1692,12 @@ void QgsGrassEdit::displayDynamic ( struct line_pnts *Points, double x, double y
 	    point.setX(Points->x[i]);
 	    point.setY(Points->y[i]);
             point = transformLayerToMap ( point );
-            mRubberBandLine->addPoint(point);
+            mRubberBandLine->addPoint(point, false); // false = don't update now
         }
+        // Now add the last point again and force update of rubberband.
+        // This should improve the performance as canvas is updated only once
+        // and not with every added point to rubberband.
+        mRubberBandLine->addPoint(point, true);
     }
 
     mRubberBandIcon->setIconType(type);