X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=src%2Fserver%2Fmap.c;h=4cce02ae3c5cd08831f96f0d0bb49b5f0224959d;hb=ac7521c1d40b86cd7d33cef590353692542fa0a4;hp=ae907d2327363fef50919575440a27a6a094a702;hpb=f6615d3be438bbca4997c38c546c0d8724da80d4;p=plomrogue

diff --git a/src/server/map.c b/src/server/map.c
index ae907d2..4cce02a 100644
--- a/src/server/map.c
+++ b/src/server/map.c
@@ -1,17 +1,24 @@
-/* src/server/map.c */
+/* src/server/map.c
+ *
+ * This file is part of PlomRogue. PlomRogue is licensed under the GPL version 3
+ * or any later version. For details on its copyright, license, and warranties,
+ * see the file NOTICE in the root directory of the PlomRogue source package.
+ */
 
 #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 "../common/rexit.h" /* exit_err() */
 #include "../common/try_malloc.h" /* try_malloc() */
 #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);
+
 /* 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 +39,40 @@ 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 iter_limit(uint8_t init)
 {
     static uint32_t i = 0;
@@ -154,8 +195,36 @@ 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)
+    static int8_t wrap_west_east   = 0;
+    static int8_t wrap_north_south = 0;
+    if (!yx)
+    {
+        wrap_west_east = wrap_north_south = 0;
+        return 0;
+    }
+    char * err = "Too much wrapping in mv_yx_in_dir_legal().";
+    exit_err(   INT8_MIN == wrap_west_east || INT8_MIN == wrap_north_south
+             || INT8_MAX == wrap_west_east || INT8_MAX == wrap_north_south,err);
+    struct yx_uint8 original = *yx;
+    mv_yx_in_dir(dir, yx);
+    if      (('e' == dir || 'd' == dir || 'c' == dir) && yx->x < original.x)
+    {
+        wrap_west_east++;
+    }
+    else if (('x' == dir || 's' == dir || 'w' == dir) && yx->x > original.x)
+    {
+        wrap_west_east--;
+    }
+    if      (('w' == dir || 'e' == dir)               && yx->y > original.y)
+    {
+        wrap_north_south--;
+    }
+    else if (('x' == dir || 'c' == dir)               && yx->y < original.y)
+    {
+        wrap_north_south++;
+    }
+    if (   !wrap_west_east && !wrap_north_south
+        && yx->x < world.map.length && yx->y < world.map.length)
     {
         return 1;
     }