X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/puzzles/blobdiff_plain/4e0bfa1907aaa46547eb9beff74a31c415814bab..b725220b2f16c89753a2e3bcf793d4822fe3b35c:/unfinished/slide.c

diff --git a/unfinished/slide.c b/unfinished/slide.c
index 8a954a3..634c5de 100644
--- a/unfinished/slide.c
+++ b/unfinished/slide.c
@@ -5,9 +5,6 @@
 /*
  * TODO:
  * 
- *  - The dragging semantics are still subtly wrong in complex
- *    cases.
- * 
  *  - Improve the generator.
  *     * actually, we seem to be mostly sensible already now. I
  * 	 want more choice over the type of main block and location
@@ -654,7 +651,7 @@ static void generate_board(int w, int h, int *rtx, int *rty, int *minmoves,
     int *list, nlist, pos;
     int tx, ty;
     int i, j;
-    int moves;
+    int moves = 0;                     /* placate optimiser */
 
     /*
      * Set up a board and fill it with singletons, except for a
@@ -824,6 +821,9 @@ static void generate_board(int w, int h, int *rtx, int *rty, int *minmoves,
 	}
     }
 
+    sfree(dsf);
+    sfree(list);
+    sfree(tried_merge);
     sfree(board2);
 
     *rtx = tx;
@@ -1169,6 +1169,11 @@ static char *solve_game(game_state *state, game_state *currstate,
     return ret;
 }
 
+static int game_can_format_as_text_now(game_params *params)
+{
+    return TRUE;
+}
+
 static char *game_text_format(game_state *state)
 {
     return board_text_format(state->w, state->h, state->board,
@@ -1345,17 +1350,36 @@ static char *interpret_move(game_state *state, game_ui *ui, game_drawstate *ds,
 	 */
 	return "";
     } else if (button == LEFT_DRAG && ui->dragging) {
+	int dist, distlimit, dx, dy, s, px, py;
+
 	tx = FROMCOORD(x);
 	ty = FROMCOORD(y);
 
 	tx -= ui->drag_offset_x;
 	ty -= ui->drag_offset_y;
-	if (tx < 0 || tx >= w || ty < 0 || ty >= h ||
-	    !ui->reachable[ty*w+tx])
-	    return NULL;	       /* this drag has no effect */
 
-	ui->drag_currpos = ty*w+tx;
-	return "";
+	/*
+	 * Now search outwards from (tx,ty), in order of Manhattan
+	 * distance, until we find a reachable square.
+	 */
+	distlimit = w+tx;
+	distlimit = max(distlimit, h+ty);
+	distlimit = max(distlimit, tx);
+	distlimit = max(distlimit, ty);
+	for (dist = 0; dist <= distlimit; dist++) {
+	    for (dx = -dist; dx <= dist; dx++)
+		for (s = -1; s <= +1; s += 2) {
+		    dy = s * (dist - abs(dx));
+		    px = tx + dx;
+		    py = ty + dy;
+		    if (px >= 0 && px < w && py >= 0 && py < h &&
+			ui->reachable[py*w+px]) {
+			ui->drag_currpos = py*w+px;
+			return "";
+		    }
+		}
+	}
+	return NULL;		       /* give up - this drag has no effect */
     } else if (button == LEFT_RELEASE && ui->dragging) {
 	char data[256], *str;
 
@@ -1576,7 +1600,8 @@ static void game_compute_size(game_params *params, int tilesize,
 			      int *x, int *y)
 {
     /* fool the macros */
-    struct dummy { int tilesize; } dummy = { tilesize }, *ds = &dummy;
+    struct dummy { int tilesize; } dummy, *ds = &dummy;
+    dummy.tilesize = tilesize;
 
     *x = params->w * TILESIZE + 2*BORDER;
     *y = params->h * TILESIZE + 2*BORDER;
@@ -2282,7 +2307,7 @@ static void game_print(drawing *dr, game_state *state, int tilesize)
 }
 
 #ifdef COMBINED
-#define thegame nullgame
+#define thegame slide
 #endif
 
 const struct game thegame = {
@@ -2301,7 +2326,7 @@ const struct game thegame = {
     dup_game,
     free_game,
     TRUE, solve_game,
-    TRUE, game_text_format,
+    TRUE, game_can_format_as_text_now, game_text_format,
     new_ui,
     free_ui,
     encode_ui,