diff -r 9646f7e37c31 -r be51ea0adc29 src/ai/api/ai_tile.hpp
--- a/src/ai/api/ai_tile.hpp	Tue Mar 25 12:09:42 2008 +0000
+++ b/src/ai/api/ai_tile.hpp	Tue Mar 25 12:12:45 2008 +0000
@@ -59,6 +59,17 @@
 	static bool IsBuildable(TileIndex tile);
 
 	/**
+	 	 * Check if this tile is buildable in a rectangle around a tile, with the entry in the list as top-left.
+	 * @note Road and rail are considered buildable.
+	 * @param tile the tile to check on.
+	 * @param width the width of the rectangle.
+	 * @param height the height of the rectangle.
+	 * @pre AIMap::IsValidTile(tile).
+	 * @return true if it is buildable, false if not.
+	 */
+	static bool IsBuildableRectangle(TileIndex tile, uint width, uint height);
+
+	/**
 	 * Check if a tile is water.
 	 * @param tile the tile to check on.
 	 * @pre AIMap::IsValidTile(tile).
@@ -112,6 +123,22 @@
 	static int32 GetCargoProduction(TileIndex tile, CargoID cargo_type, uint width, uint height, uint radius);
 
 	/**
+	 * Get the manhattan distance from the tile to the tile.
+	 * @param tile_from The tile to get the distance to.
+	 * @param tile_to The tile to get the distance to.
+	 * @return The distance between the two tiles.
+	 */
+	static int32 GetDistanceManhattanToTile(TileIndex tile_from, TileIndex tile_to);
+
+	/**
+	 * Get the square distance from the tile to the tile.
+	 * @param tile_from The tile to get the distance to.
+	 * @param tile_to The tile to get the distance to.
+	 * @return The distance between the two tiles.
+	 */
+	static int32 GetDistanceSquareToTile(TileIndex tile_from, TileIndex tile_to);
+
+	/**
 	 * Raise the given corners of the tile. The corners can be combined,
 	 *  for example: SLOPE_N | SLOPE_W (= SLOPE_NW)
 	 * @param tile the tile to raise.