Grid offset is recomputed only when settings are changed.

common/gal/graphics_abstraction_layer.cpp

@@ -134,9 +134,6 @@ void GAL::DrawGrid()
     // Draw the grid
     // For the drawing the start points, end points and increments have
     // to be calculated in world coordinates
-    gridOffset = VECTOR2D( (long) gridOrigin.x % (long) gridSize.x,
-                           (long) gridOrigin.y % (long) gridSize.y );
-
     VECTOR2D worldStartPoint = screenWorldMatrix * VECTOR2D( 0.0, 0.0 );
     VECTOR2D worldEndPoint   = screenWorldMatrix * VECTOR2D( screenSize );
 

include/gal/graphics_abstraction_layer.h

@@ -631,6 +631,9 @@ public:
     inline void SetGridOrigin( const VECTOR2D& aGridOrigin )
     {
         gridOrigin = aGridOrigin;
+
+        gridOffset = VECTOR2D( (long) gridOrigin.x % (long) gridSize.x,
+                               (long) gridOrigin.y % (long) gridSize.y );
     }
 
     /**
@@ -661,6 +664,9 @@ public:
     inline void SetGridSize( const VECTOR2D& aGridSize )
     {
         gridSize = aGridSize;
+
+        gridOffset = VECTOR2D( (long) gridOrigin.x % (long) gridSize.x,
+                               (long) gridOrigin.y % (long) gridSize.y );
     }
 
     /**