Added a help file, mostly thanks to Jacob.

[sgt/puzzles] / sixteen.c

diff --git a/sixteen.c b/sixteen.c
index 5b7b98e..1e865c2 100644 (file)
--- a/sixteen.c
+++ b/sixteen.c
@@ -14,6 +14,7 @@
 #include "puzzles.h"
 
 const char *const game_name = "Sixteen";
+const char *const game_winhelp_topic = "games.sixteen";
 const int game_can_configure = TRUE;
 
 #define TILE_SIZE 48
@@ -397,7 +398,7 @@ game_state *make_move(game_state *from, game_ui *ui, int x, int y, int button)
     int dx, dy, tx, ty, n;
     game_state *ret;
 
-    if (button != LEFT_BUTTON)
+    if (button != LEFT_BUTTON && button != RIGHT_BUTTON)
         return NULL;
 
     cx = FROMCOORD(x);
@@ -413,6 +414,13 @@ game_state *make_move(game_state *from, game_ui *ui, int x, int y, int button)
     else
         return NULL;                   /* invalid click location */
 
+    /* reverse direction if right hand button is pressed */
+    if (button == RIGHT_BUTTON)
+    {
+        dx = -dx; if (dx) cx = from->w - 1 - cx;
+        dy = -dy; if (dy) cy = from->h - 1 - cy;
+    }
+
     ret = dup_game(from);
 
     do {