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-rw-r--r--src/tunnelbridge.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/src/tunnelbridge.h b/src/tunnelbridge.h
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+++ b/src/tunnelbridge.h
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+/* $Id$ */
+
+/** @file tunnelbridge.h Header file for things common for tunnels and bridges */
+
+#ifndef TUNNELBRIDGE_H
+#define TUNNELBRIDGE_H
+
+#include "tile_type.h"
+#include "map_func.h"
+#include "tunnelbridge_map.h"
+
+/**
+ * Calculates the length of a tunnel or a bridge (without end tiles)
+ * @return length of bridge/tunnel middle
+ */
+static inline uint GetTunnelBridgeLength(TileIndex begin, TileIndex end)
+{
+ int x1 = TileX(begin);
+ int y1 = TileY(begin);
+ int x2 = TileX(end);
+ int y2 = TileY(end);
+
+ return abs(x2 + y2 - x1 - y1) - 1;
+}
+
+#endif /* TUNNELBRIDGE_H */