X-Git-Url: https://pd.if.org/git/?p=hexagon;a=blobdiff_plain;f=hexagon.h;h=a2d4f2f98a8e18306a3352bd32ab3af7b1708d18;hp=50665d058f87c05faaa42e11838688892485d86c;hb=HEAD;hpb=8ca2b8a06b00066a20f744a61c9bcdd65949a344

diff --git a/hexagon.h b/hexagon.h
index 50665d0..a2d4f2f 100644
--- a/hexagon.h
+++ b/hexagon.h
@@ -1,6 +1,24 @@
 #ifndef HEXLIB_H_
 #define HEXLIB_H_ 1
 
+struct HL_hex {
+	int x, y;
+};
+
+struct HL_isohex {
+	int i,j,k;
+};
+
+struct HL_point {
+	double x, y;
+};
+
+struct HL_hex HL_hex_xy(int x, int y);
+
+int HL_hex_cmp(struct HL_hex const *a, struct HL_hex const *b);
+
+int HL_hex_eq(struct HL_hex const *a, struct HL_hex const *b); 
+
 /*
  * this library implements a generic library for hexgrids for games.
  * it avoids display issues, other than some general provisions
@@ -25,7 +43,8 @@
  * on a hex boundary, the result will depend on how the machine
  * does the floating point math, but should be consistent.
  */
-int HL_hexbin(double width, double x, double y, int *i, int *j);
+struct HL_hex HL_hexbin(double width, double x, double y);
+struct HL_hex HL_bin(double x, double y);
 
 /* generate the cantor mapping of a hexes x,y coordinate.
  * See http://en.wikipedia.org/wiki/Cantor_pairing_function.
@@ -44,24 +63,10 @@ int HL_hexbin(double width, double x, double y, int *i, int *j);
  * is independent of the size of the grid.
  */
 
-/* Cartesian functions */
+/* Cantor encoding/decoding functions */
+int HL_cantor(struct HL_hex h);
 int HL_cantor_xy(int x, int y);
-int HL_cantor_xyp(int *xy);
-int HL_cantor_x(int cantor);
-int HL_cantor_y(int cantor);
-
-/* Isometric functions */
-int HL_cantor_ijk(int i, int j, int k);
-int HL_cantor_ijkp(int *ijk);
-int HL_cantor_i(int cantor);
-int HL_cantor_k(int cantor);
-int HL_cantor_j(int cantor);
-
-int HL_cantor_bin(double x, double y);
-
-/* A general decode function */
-int HL_cantor_decode(int can, int *x, int *y, int *i, int *j, int *k);
-int HL_cantor_arrays(int can, int *xy, int *ijk);
+struct HL_hex HL_uncantor(int cantor);
 
 /*
  * layout assistance functions
@@ -72,20 +77,23 @@ int HL_cantor_arrays(int can, int *xy, int *ijk);
  *
  * Similarly for HL_center_y() and HL_hexcenter()
  */
-double HL_center_x(int cantor);
-double HL_center_y(int cantor);
-int HL_hexcenter(int cantor, double *x, double *y);
+struct HL_point HL_hexcenter(struct HL_hex hex);
 
-/* how far is it on the hex grid */
-int HL_distance(int from_cantor, int to_cantor);
+/* 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
+ */
+struct HL_point HL_polar(double angle, double distance, double *d);
 
-/* returns 0 for <0 or >5 */
-int HL_adjacent_hex(int start, int dir);
+/* how far is it on the hex grid */
+int HL_distance(struct HL_hex from, struct HL_hex to);
 
 /* module direction */
-int HL_adjhex(int start, int dir);
-int HL_hexes_at_range(int hex, int range, int *list, int size);
-int HL_hexes_within_range(int hex, int range, int *list, int size);
+struct HL_hex HL_adjhex(struct HL_hex, int dir);
+int HL_adjhexp(struct HL_hex, int dir, struct HL_hex *adj);
+int HL_hexes_at_range(struct HL_hex, int range, struct HL_hex *list, int size);
+int HL_hexes_within_range(struct HL_hex, int range, struct HL_hex *list, int size);
 
 typedef double (*HL_costfunc)(int start, int finish);
 
@@ -103,18 +111,14 @@ int HL_map_max_dimension(void);
 /*
  * Plotting support
  */
-void HL_trianglefan(int cantor, double *);
-
-struct HL_hex {
-	int x,y; /* hmm.  would be nice to be able to just point to a generic */
-};
+void HL_trianglefan(struct HL_hex hex, double *);
 
 /*
  * Pathfinding
  */
 
 struct HL_astar_hex {
-	int hex;
+	struct HL_hex hex;
 	double f, g, h;
 	struct HL_astar_hex *parent;
 	int	open;
@@ -123,13 +127,12 @@ struct HL_astar_hex {
 };
 
 struct HL_astar {
-	int start, goal;
+	struct HL_hex start, goal;
 	int pathlen;
-	double (*metric)(int,int);
-	double (*heuristic)(int,int);
-	int (*neighbor)(int,int);
+	double (*metric)(struct HL_hex,struct HL_hex);
+	double (*heuristic)(struct HL_hex,struct HL_hex);
+	int (*neighbor)(struct HL_hex,int dir, struct HL_hex *n);
 	int nodes, allocated;
-	struct HL_astar_hex *sets;
 	struct HL_astar_hex *open;
 	struct HL_astar_hex *closed;
 	struct HL_astar_hex *from, *to;
@@ -141,5 +144,13 @@ int HL_findpath(struct HL_astar *s, int loops);
 void HL_astar_free(struct HL_astar *s);
 struct HL_astar *HL_astar_clear(struct HL_astar *s);
 struct HL_astar *HL_astar_init(struct HL_astar *s);
+void HL_vertices(struct HL_hex hex, double *vc);
+
+extern double HL_vertexv[12];
+extern double HL_fand[16];
+extern float HL_fanf[16];
+extern double HL_hfand[16]; /* horizontal grids */
+extern float HL_hfanf[16]; /* horizontal grids */
+extern double HL_square;
 
 #endif