rubidium@9724: /* $Id$ */
rubidium@9724: 
rubidium@9724: /** @file tunnelbridge.h Header file for things common for tunnels and bridges */
rubidium@9724: 
rubidium@9724: #ifndef TUNNELBRIDGE_H
rubidium@9724: #define TUNNELBRIDGE_H
rubidium@9724: 
rubidium@9724: #include "tile_type.h"
rubidium@9724: 
rubidium@9724: /**
rubidium@9724:  * Calculates the length of a tunnel or a bridge (without end tiles)
rubidium@9724:  * @return length of bridge/tunnel middle
rubidium@9724:  */
rubidium@9724: static inline uint GetTunnelBridgeLength(TileIndex begin, TileIndex end)
rubidium@9724: {
rubidium@9724: 	int x1 = TileX(begin);
rubidium@9724: 	int y1 = TileY(begin);
rubidium@9724: 	int x2 = TileX(end);
rubidium@9724: 	int y2 = TileY(end);
rubidium@9724: 
rubidium@9724: 	return abs(x2 + y2 - x1 - y1) - 1;
rubidium@9724: }
rubidium@9724: 
rubidium@10249: extern TileIndex _build_tunnel_endtile;
rubidium@10249: 
rubidium@9724: #endif /* TUNNELBRIDGE_H */