(svn r21019) -Add: Use center of industry to focus on in the industry gui.

src/industry_gui.cpp

@@ -673,7 +673,7 @@ public:
 
 		this->InitNested(desc, window_number);
 		NWidgetViewport *nvp = this->GetWidget<NWidgetViewport>(IVW_VIEWPORT);
-		nvp->InitializeViewport(this, Industry::Get(window_number)->location.tile + TileDiffXY(1, 1), ZOOM_LVL_INDUSTRY);
+		nvp->InitializeViewport(this, Industry::Get(window_number)->location.GetCenterTile(), ZOOM_LVL_INDUSTRY);
 
 		this->InvalidateData();
 	}
@@ -900,9 +900,9 @@ public:
 			case IVW_GOTO: {
 				Industry *i = Industry::Get(this->window_number);
 				if (_ctrl_pressed) {
-					ShowExtraViewPortWindow(i->location.tile + TileDiffXY(1, 1));
+					ShowExtraViewPortWindow(i->location.GetCenterTile());
 				} else {
-					ScrollMainWindowToTile(i->location.tile + TileDiffXY(1, 1));
+					ScrollMainWindowToTile(i->location.GetCenterTile());
 				}
 				break;
 			}

src/tilearea_type.h

@@ -12,7 +12,7 @@
 #ifndef TILEAREA_TYPE_H
 #define TILEAREA_TYPE_H
 
-#include "tile_type.h"
+#include "map_func.h"
 
 /** Represents the covered area of e.g. a rail station */
 struct TileArea {
@@ -49,6 +49,15 @@ struct TileArea {
 	bool Intersects(const TileArea &ta) const;
 
 	void ClampToMap();
+
+	/**
+	 * Get the center tile.
+	 * @return The tile at the center, or just north of it.
+	 */
+	TileIndex GetCenterTile() const
+	{
+		return TILE_ADDXY(this->tile, this->w / 2, this->h / 2);
+	}
 };
 
 #endif /* TILEAREA_TYPE_H */