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-rw-r--r--src/map/path.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/src/map/path.h b/src/map/path.h
index 138845dc4..83992b546 100644
--- a/src/map/path.h
+++ b/src/map/path.h
@@ -13,4 +13,16 @@ bool path_search(struct walkpath_data *wpd,int m,int x0,int y0,int x1,int y1,int
// tries to find a shootable path
bool path_search_long(struct shootpath_data *spd,int m,int x0,int y0,int x1,int y1,cell_t cell);
+
+// distance related functions
+int check_distance(int dx, int dy, int distance);
+#define check_distance_bl(bl1, bl2, distance) check_distance((bl1)->x - (bl2)->x, (bl1)->y - (bl2)->y, distance)
+#define check_distance_blxy(bl, x1, y1, distance) check_distance((bl)->x-(x1), (bl)->y-(y1), distance)
+#define check_distance_xy(x0, y0, x1, y1, distance) check_distance((x0)-(x1), (y0)-(y1), distance)
+
+unsigned int distance(int dx, int dy);
+#define distance_bl(bl1, bl2) distance((bl1)->x - (bl2)->x, (bl1)->y - (bl2)->y)
+#define distance_blxy(bl, x1, y1) distance((bl)->x-(x1), (bl)->y-(y1))
+#define distance_xy(x0, y0, x1, y1) distance((x0)-(x1), (y0)-(y1))
+
#endif /* _PATH_H_ */