fixed broken UiOverlay

OpenRa.DataStructures/float2.cs

@@ -82,5 +82,6 @@ namespace OpenRa
 		public float2 Round() { return new float2((float)Math.Round(X), (float)Math.Round(Y)); }
 
 		public override string ToString() { return string.Format("({0},{1})", X, Y); }
+		public int2 ToInt2() { return new int2((int)X, (int)Y); }
 	}
 }

OpenRa.Game/MainWindow.cs

@@ -95,11 +95,11 @@ namespace OpenRa.Game
                 Button = e.Button,
                 Event = MouseInputEvent.Move,
                 Location = new int2(e.Location)
-            });
-
-			if (game.controller.orderGenerator != null)
-				game.controller.orderGenerator.PrepareOverlay(game, 
-					new int2(e.Location.X / 24, e.Location.Y / 24));
+            });
+
+			if (game.controller.orderGenerator != null)
+				game.controller.orderGenerator.PrepareOverlay(game,
+					((1 / 24f) * (new float2(e.Location) + game.viewport.Location)).ToInt2());
 		}
 
         protected override void OnMouseUp(MouseEventArgs e)

OpenRa.Game/UiOverlay.cs

@@ -49,7 +49,7 @@ namespace OpenRa.Game
 			for (int i = 0; i < width; i++)
 				for (int j = 0; j < height; j++)
 					spriteRenderer.DrawSprite(passableAt(position.X + i, position.Y + j) ? buildOk : buildBlocked,
-						24 * (position + new int2(i, j)) + game.viewport.Location, 0);
+						24 * (position + new int2(i, j)), 0);
 
 			spriteRenderer.Flush();
 		}