X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;ds=sidebyside;f=src%2Fserver%2Fmap.c;h=d4265f37a6e3ce4daa2881ecf03ff7932d8264b4;hb=bc7f716bd4845e9660d904cad7b9f7d813e22541;hp=d98a61f28813730e33388fe48f42b7ec3ff7391b;hpb=58486c337a7b1f04311801d902fed41ed3f67315;p=plomrogue

diff --git a/src/server/map.c b/src/server/map.c
index d98a61f..d4265f3 100644
--- a/src/server/map.c
+++ b/src/server/map.c
@@ -1,17 +1,25 @@
 /* src/server/map.c */
 
 #include "map.h"
-#include <stdint.h> /* uint8_t, uint16_t, uint32_t, UINT16_MAX */
+#include <stdint.h> /* uint8_t, int8_t, uint16_t, uint32_t, (U)INT*_(MIN|MAX) */
 #include <stdlib.h> /* free() */
+#include <string.h> /* strchr() */
 #include "../common/rexit.h" /* exit_err() */
 #include "../common/try_malloc.h" /* try_malloc() */
-#include "../common/yx_uint8.h" /* struct yx_uint8 */
+#include "../common/yx_uint8.h" /* yx_uint8 */
 #include "rrand.h" /* rrand() */
-#include "yx_uint8.h" /* mv_yx_in_dir_wrap() */
 #include "world.h" /* global world */
 
 
 
+/* Helper to mv_yx_in_dir_legal(). Move "yx" into hex direction "d". */
+static void mv_yx_in_dir(char d, struct yx_uint8 * yx);
+
+/* Helper to mv_yx_in_dir_legal(). Move "yx" into hex direction "d", do wrapping
+ * logic, return 1 if "yx" ends outside of the original wrap space, else 0.
+ */
+static uint8_t mv_yx_in_dir_wrap(char d, struct yx_uint8 * yx);
+
 /* Call this too often with "init" of 0 and the game exits with an error message
  * about reaching an iteration limit. An "init" of 1 sets the iteration counter
  * to 0. Iteration limit is currently 256 * UINT16_MAX.
@@ -32,6 +40,77 @@ static void make_trees();
 
 
 
+static void mv_yx_in_dir(char d, struct yx_uint8 * yx)
+{
+    if      (d == 'e')
+    {
+        yx->x = yx->x + (yx->y % 2);
+        yx->y--;
+    }
+    else if (d == 'd')
+    {
+        yx->x++;
+    }
+    else if (d == 'c')
+    {
+        yx->x = yx->x + (yx->y % 2);
+        yx->y++;
+    }
+    else if (d == 'x')
+    {
+        yx->x = yx->x - !(yx->y % 2);
+        yx->y++;
+    }
+    else if (d == 's')
+    {
+        yx->x--;
+    }
+    else if (d == 'w')
+    {
+        yx->x = yx->x - !(yx->y % 2);
+        yx->y--;
+    }
+}
+
+
+
+static uint8_t mv_yx_in_dir_wrap(char d, struct yx_uint8 * yx)
+{
+    static int8_t wrap_west_east   = 0;
+    static int8_t wrap_north_south = 0;
+    char * err = "Too much wrapping in mv_yx_in_dir_wrap().";
+    exit_err(INT8_MIN == wrap_west_east || INT8_MIN == wrap_north_south, err);
+    exit_err(INT8_MAX == wrap_west_east || INT8_MAX == wrap_north_south, err);
+    if (!yx)
+    {
+        wrap_west_east = wrap_north_south = 0;
+        return 0;
+    }
+    struct yx_uint8 original;
+    original.y = yx->y;
+    original.x = yx->x;
+    mv_yx_in_dir(d, yx);
+    if      (strchr("edc", d) && yx->x < original.x)
+    {
+        wrap_west_east++;
+    }
+    else if (strchr("xsw", d) && yx->x > original.x)
+    {
+        wrap_west_east--;
+    }
+    if      (strchr("we", d) && yx->y > original.y)
+    {
+        wrap_north_south--;
+    }
+    else if (strchr("xc", d) && yx->y < original.y)
+    {
+        wrap_north_south++;
+    }
+    return (wrap_west_east != 0) + (wrap_north_south != 0);
+}
+
+
+
 static uint8_t iter_limit(uint8_t init)
 {
     static uint32_t i = 0;
@@ -154,8 +233,8 @@ extern void remake_map()
 
 extern uint8_t mv_yx_in_dir_legal(char dir, struct yx_uint8 * yx)
 {
-    uint8_t wraptest = mv_yx_in_dir_wrap(dir, yx, 0);
-    if (!wraptest && yx->x < world.map.length && yx->y < world.map.length)
+    uint8_t wraptest = mv_yx_in_dir_wrap(dir, yx);
+    if (yx && !wraptest && yx->x < world.map.length && yx->y < world.map.length)
     {
         return 1;
     }