add polar coordinate calculation

[hexagon] / hexagon.h

diff --git a/hexagon.h b/hexagon.h
index 6768a62275e23436e4ce8b29cc35c1cbbdcbd8ba..9578bdd055611a58ad3f25f9f755050a1d9a65c4 100644 (file)
--- a/hexagon.h
+++ b/hexagon.h
@@ -76,6 +76,13 @@ double HL_center_x(int cantor);
 double HL_center_y(int cantor);
 int HL_hexcenter(int cantor, double *x, double *y);
 
+/* find a point based on a unit hex, given angle and distance from center,
+ * where a distance of 1 is on the hex side.  probably not useful
+ * for points outside the hex, that is, distance should almost certainly
+ * be less than or equal to 1.0
+ */
+double HL_polar(double angle, double distance, double *x, double *y);
+
 /* how far is it on the hex grid */
 int HL_distance(int from_cantor, int to_cantor);
 
@@ -109,6 +116,10 @@ struct HL_hex {
        int x,y; /* hmm.  would be nice to be able to just point to a generic */
 };
 
+struct hl_point {
+       double x, y;
+};
+
 /*
  * Pathfinding
  */
@@ -129,7 +140,6 @@ struct HL_astar {
        double (*heuristic)(int,int);
        int (*neighbor)(int,int);
        int nodes, allocated;
-       struct HL_astar_hex *sets;
        struct HL_astar_hex *open;
        struct HL_astar_hex *closed;
        struct HL_astar_hex *from, *to;
@@ -143,6 +153,7 @@ struct HL_astar *HL_astar_clear(struct HL_astar *s);
 struct HL_astar *HL_astar_init(struct HL_astar *s);
 void HL_vertices(int cantor, double *vc);
 
+extern double HL_vertexv[12];
 extern double HL_fand[16];
 extern float HL_fanf[16];
 extern double HL_hfand[16]; /* horizontal grids */