2 * sixteen.c: `16-puzzle', a sliding-tiles jigsaw which differs
3 * from the 15-puzzle in that you toroidally rotate a row or column
15 const char *const game_name
= "Sixteen";
16 const int game_can_configure
= TRUE
;
19 #define BORDER TILE_SIZE /* big border to fill with arrows */
20 #define HIGHLIGHT_WIDTH (TILE_SIZE / 20)
21 #define COORD(x) ( (x) * TILE_SIZE + BORDER )
22 #define FROMCOORD(x) ( ((x) - BORDER + 2*TILE_SIZE) / TILE_SIZE - 2 )
24 #define ANIM_TIME 0.1F
25 #define FLASH_FRAME 0.1F
27 #define X(state, i) ( (i) % (state)->w )
28 #define Y(state, i) ( (i) / (state)->w )
29 #define C(state, x, y) ( (y) * (state)->w + (x) )
48 int last_movement_sense
;
51 game_params
*default_params(void)
53 game_params
*ret
= snew(game_params
);
60 int game_fetch_preset(int i
, char **name
, game_params
**params
)
67 case 0: w
= 3, h
= 3; break;
68 case 1: w
= 4, h
= 3; break;
69 case 2: w
= 4, h
= 4; break;
70 case 3: w
= 5, h
= 4; break;
71 case 4: w
= 5, h
= 5; break;
72 default: return FALSE
;
75 sprintf(buf
, "%dx%d", w
, h
);
77 *params
= ret
= snew(game_params
);
83 void free_params(game_params
*params
)
88 game_params
*dup_params(game_params
*params
)
90 game_params
*ret
= snew(game_params
);
91 *ret
= *params
; /* structure copy */
95 config_item
*game_configure(game_params
*params
)
100 ret
= snewn(3, config_item
);
102 ret
[0].name
= "Width";
103 ret
[0].type
= C_STRING
;
104 sprintf(buf
, "%d", params
->w
);
105 ret
[0].sval
= dupstr(buf
);
108 ret
[1].name
= "Height";
109 ret
[1].type
= C_STRING
;
110 sprintf(buf
, "%d", params
->h
);
111 ret
[1].sval
= dupstr(buf
);
122 game_params
*custom_params(config_item
*cfg
)
124 game_params
*ret
= snew(game_params
);
126 ret
->w
= atoi(cfg
[0].sval
);
127 ret
->h
= atoi(cfg
[1].sval
);
132 char *validate_params(game_params
*params
)
134 if (params
->w
< 2 && params
->h
< 2)
135 return "Width and height must both be at least two";
140 int perm_parity(int *perm
, int n
)
146 for (i
= 0; i
< n
-1; i
++)
147 for (j
= i
+1; j
< n
; j
++)
148 if (perm
[i
] > perm
[j
])
154 char *new_game_seed(game_params
*params
)
162 n
= params
->w
* params
->h
;
164 tiles
= snewn(n
, int);
165 used
= snewn(n
, int);
167 for (i
= 0; i
< n
; i
++) {
173 * If both dimensions are odd, there is a parity constraint.
175 if (params
->w
& params
->h
& 1)
181 * Place everything except (possibly) the last two tiles.
183 for (x
= 0, i
= n
; i
> stop
; i
--) {
184 int k
= i
> 1 ?
rand_upto(i
) : 0;
187 for (j
= 0; j
< n
; j
++)
188 if (!used
[j
] && (k
-- == 0))
191 assert(j
< n
&& !used
[j
]);
194 while (tiles
[x
] >= 0)
202 * Find the last two locations, and the last two pieces.
204 while (tiles
[x
] >= 0)
209 while (tiles
[x
] >= 0)
214 for (i
= 0; i
< n
; i
++)
218 for (i
= p1
+1; i
< n
; i
++)
224 * Try the last two tiles one way round. If that fails, swap
229 if (perm_parity(tiles
, n
) != 0) {
232 assert(perm_parity(tiles
, n
) == 0);
237 * Now construct the game seed, by describing the tile array as
238 * a simple sequence of comma-separated integers.
242 for (i
= 0; i
< n
; i
++) {
246 k
= sprintf(buf
, "%d,", tiles
[i
]+1);
248 ret
= sresize(ret
, retlen
+ k
+ 1, char);
249 strcpy(ret
+ retlen
, buf
);
252 ret
[retlen
-1] = '\0'; /* delete last comma */
261 char *validate_seed(game_params
*params
, char *seed
)
267 area
= params
->w
* params
->h
;
271 used
= snewn(area
, int);
272 for (i
= 0; i
< area
; i
++)
275 for (i
= 0; i
< area
; i
++) {
279 if (*p
< '0' || *p
> '9') {
280 err
= "Not enough numbers in string";
283 while (*p
>= '0' && *p
<= '9')
285 if (i
< area
-1 && *p
!= ',') {
286 err
= "Expected comma after number";
289 else if (i
== area
-1 && *p
) {
290 err
= "Excess junk at end of string";
294 if (n
< 1 || n
> area
) {
295 err
= "Number out of range";
299 err
= "Number used twice";
304 if (*p
) p
++; /* eat comma */
312 game_state
*new_game(game_params
*params
, char *seed
)
314 game_state
*state
= snew(game_state
);
318 state
->w
= params
->w
;
319 state
->h
= params
->h
;
320 state
->n
= params
->w
* params
->h
;
321 state
->tiles
= snewn(state
->n
, int);
325 for (i
= 0; i
< state
->n
; i
++) {
327 state
->tiles
[i
] = atoi(p
);
328 while (*p
&& *p
!= ',')
330 if (*p
) p
++; /* eat comma */
334 state
->completed
= state
->movecount
= 0;
335 state
->last_movement_sense
= 0;
340 game_state
*dup_game(game_state
*state
)
342 game_state
*ret
= snew(game_state
);
347 ret
->tiles
= snewn(state
->w
* state
->h
, int);
348 memcpy(ret
->tiles
, state
->tiles
, state
->w
* state
->h
* sizeof(int));
349 ret
->completed
= state
->completed
;
350 ret
->movecount
= state
->movecount
;
351 ret
->last_movement_sense
= state
->last_movement_sense
;
356 void free_game(game_state
*state
)
361 game_state
*make_move(game_state
*from
, int x
, int y
, int button
)
364 int dx
, dy
, tx
, ty
, n
;
367 if (button
!= LEFT_BUTTON
)
372 if (cx
== -1 && cy
>= 0 && cy
< from
->h
)
373 n
= from
->w
, dx
= +1, dy
= 0;
374 else if (cx
== from
->w
&& cy
>= 0 && cy
< from
->h
)
375 n
= from
->w
, dx
= -1, dy
= 0;
376 else if (cy
== -1 && cx
>= 0 && cx
< from
->w
)
377 n
= from
->h
, dy
= +1, dx
= 0;
378 else if (cy
== from
->h
&& cx
>= 0 && cx
< from
->w
)
379 n
= from
->h
, dy
= -1, dx
= 0;
381 return NULL
; /* invalid click location */
383 ret
= dup_game(from
);
388 tx
= (cx
+ dx
+ from
->w
) % from
->w
;
389 ty
= (cy
+ dy
+ from
->h
) % from
->h
;
390 ret
->tiles
[C(ret
, cx
, cy
)] = from
->tiles
[C(from
, tx
, ty
)];
395 ret
->last_movement_sense
= -(dx
+dy
);
398 * See if the game has been completed.
400 if (!ret
->completed
) {
401 ret
->completed
= ret
->movecount
;
402 for (n
= 0; n
< ret
->n
; n
++)
403 if (ret
->tiles
[n
] != n
+1)
404 ret
->completed
= FALSE
;
410 /* ----------------------------------------------------------------------
414 struct game_drawstate
{
420 void game_size(game_params
*params
, int *x
, int *y
)
422 *x
= TILE_SIZE
* params
->w
+ 2 * BORDER
;
423 *y
= TILE_SIZE
* params
->h
+ 2 * BORDER
;
426 float *game_colours(frontend
*fe
, game_state
*state
, int *ncolours
)
428 float *ret
= snewn(3 * NCOLOURS
, float);
432 frontend_default_colour(fe
, &ret
[COL_BACKGROUND
* 3]);
435 * Drop the background colour so that the highlight is
436 * noticeably brighter than it while still being under 1.
438 max
= ret
[COL_BACKGROUND
*3];
439 for (i
= 1; i
< 3; i
++)
440 if (ret
[COL_BACKGROUND
*3+i
] > max
)
441 max
= ret
[COL_BACKGROUND
*3+i
];
442 if (max
* 1.2F
> 1.0F
) {
443 for (i
= 0; i
< 3; i
++)
444 ret
[COL_BACKGROUND
*3+i
] /= (max
* 1.2F
);
447 for (i
= 0; i
< 3; i
++) {
448 ret
[COL_HIGHLIGHT
* 3 + i
] = ret
[COL_BACKGROUND
* 3 + i
] * 1.2F
;
449 ret
[COL_LOWLIGHT
* 3 + i
] = ret
[COL_BACKGROUND
* 3 + i
] * 0.8F
;
450 ret
[COL_TEXT
* 3 + i
] = 0.0;
453 *ncolours
= NCOLOURS
;
457 game_drawstate
*game_new_drawstate(game_state
*state
)
459 struct game_drawstate
*ds
= snew(struct game_drawstate
);
465 ds
->bgcolour
= COL_BACKGROUND
;
466 ds
->tiles
= snewn(ds
->w
*ds
->h
, int);
467 for (i
= 0; i
< ds
->w
*ds
->h
; i
++)
473 void game_free_drawstate(game_drawstate
*ds
)
479 static void draw_tile(frontend
*fe
, game_state
*state
, int x
, int y
,
480 int tile
, int flash_colour
)
483 draw_rect(fe
, x
, y
, TILE_SIZE
, TILE_SIZE
,
489 coords
[0] = x
+ TILE_SIZE
- 1;
490 coords
[1] = y
+ TILE_SIZE
- 1;
491 coords
[2] = x
+ TILE_SIZE
- 1;
494 coords
[5] = y
+ TILE_SIZE
- 1;
495 draw_polygon(fe
, coords
, 3, TRUE
, COL_LOWLIGHT
);
496 draw_polygon(fe
, coords
, 3, FALSE
, COL_LOWLIGHT
);
500 draw_polygon(fe
, coords
, 3, TRUE
, COL_HIGHLIGHT
);
501 draw_polygon(fe
, coords
, 3, FALSE
, COL_HIGHLIGHT
);
503 draw_rect(fe
, x
+ HIGHLIGHT_WIDTH
, y
+ HIGHLIGHT_WIDTH
,
504 TILE_SIZE
- 2*HIGHLIGHT_WIDTH
, TILE_SIZE
- 2*HIGHLIGHT_WIDTH
,
507 sprintf(str
, "%d", tile
);
508 draw_text(fe
, x
+ TILE_SIZE
/2, y
+ TILE_SIZE
/2,
509 FONT_VARIABLE
, TILE_SIZE
/3, ALIGN_VCENTRE
| ALIGN_HCENTRE
,
512 draw_update(fe
, x
, y
, TILE_SIZE
, TILE_SIZE
);
515 static void draw_arrow(frontend
*fe
, int x
, int y
, int xdx
, int xdy
)
518 int ydy
= -xdx
, ydx
= xdy
;
520 #define POINT(n, xx, yy) ( \
521 coords[2*(n)+0] = x + (xx)*xdx + (yy)*ydx, \
522 coords[2*(n)+1] = y + (xx)*xdy + (yy)*ydy)
524 POINT(0, TILE_SIZE
/ 2, 3 * TILE_SIZE
/ 4); /* top of arrow */
525 POINT(1, 3 * TILE_SIZE
/ 4, TILE_SIZE
/ 2); /* right corner */
526 POINT(2, 5 * TILE_SIZE
/ 8, TILE_SIZE
/ 2); /* right concave */
527 POINT(3, 5 * TILE_SIZE
/ 8, TILE_SIZE
/ 4); /* bottom right */
528 POINT(4, 3 * TILE_SIZE
/ 8, TILE_SIZE
/ 4); /* bottom left */
529 POINT(5, 3 * TILE_SIZE
/ 8, TILE_SIZE
/ 2); /* left concave */
530 POINT(6, TILE_SIZE
/ 4, TILE_SIZE
/ 2); /* left corner */
532 draw_polygon(fe
, coords
, 7, TRUE
, COL_LOWLIGHT
);
533 draw_polygon(fe
, coords
, 7, FALSE
, COL_TEXT
);
536 void game_redraw(frontend
*fe
, game_drawstate
*ds
, game_state
*oldstate
,
537 game_state
*state
, float animtime
, float flashtime
)
539 int i
, pass
, bgcolour
;
542 int frame
= (int)(flashtime
/ FLASH_FRAME
);
543 bgcolour
= (frame
% 2 ? COL_LOWLIGHT
: COL_HIGHLIGHT
);
545 bgcolour
= COL_BACKGROUND
;
551 TILE_SIZE
* state
->w
+ 2 * BORDER
,
552 TILE_SIZE
* state
->h
+ 2 * BORDER
, COL_BACKGROUND
);
553 draw_update(fe
, 0, 0,
554 TILE_SIZE
* state
->w
+ 2 * BORDER
,
555 TILE_SIZE
* state
->h
+ 2 * BORDER
);
558 * Recessed area containing the whole puzzle.
560 coords
[0] = COORD(state
->w
) + HIGHLIGHT_WIDTH
- 1;
561 coords
[1] = COORD(state
->h
) + HIGHLIGHT_WIDTH
- 1;
562 coords
[2] = COORD(state
->w
) + HIGHLIGHT_WIDTH
- 1;
563 coords
[3] = COORD(0) - HIGHLIGHT_WIDTH
;
564 coords
[4] = COORD(0) - HIGHLIGHT_WIDTH
;
565 coords
[5] = COORD(state
->h
) + HIGHLIGHT_WIDTH
- 1;
566 draw_polygon(fe
, coords
, 3, TRUE
, COL_HIGHLIGHT
);
567 draw_polygon(fe
, coords
, 3, FALSE
, COL_HIGHLIGHT
);
569 coords
[1] = COORD(0) - HIGHLIGHT_WIDTH
;
570 coords
[0] = COORD(0) - HIGHLIGHT_WIDTH
;
571 draw_polygon(fe
, coords
, 3, TRUE
, COL_LOWLIGHT
);
572 draw_polygon(fe
, coords
, 3, FALSE
, COL_LOWLIGHT
);
575 * Arrows for making moves.
577 for (i
= 0; i
< state
->w
; i
++) {
578 draw_arrow(fe
, COORD(i
), COORD(0), +1, 0);
579 draw_arrow(fe
, COORD(i
+1), COORD(state
->h
), -1, 0);
581 for (i
= 0; i
< state
->h
; i
++) {
582 draw_arrow(fe
, COORD(state
->w
), COORD(i
), 0, +1);
583 draw_arrow(fe
, COORD(0), COORD(i
+1), 0, -1);
590 * Now draw each tile. We do this in two passes to make
594 clip(fe
, COORD(0), COORD(0), TILE_SIZE
*state
->w
, TILE_SIZE
*state
->h
);
596 for (pass
= 0; pass
< 2; pass
++) {
597 for (i
= 0; i
< state
->n
; i
++) {
600 * Figure out what should be displayed at this
601 * location. It's either a simple tile, or it's a
602 * transition between two tiles (in which case we say
603 * -1 because it must always be drawn).
606 if (oldstate
&& oldstate
->tiles
[i
] != state
->tiles
[i
])
613 if (ds
->bgcolour
!= bgcolour
|| /* always redraw when flashing */
614 ds
->tiles
[i
] != t
|| ds
->tiles
[i
] == -1 || t
== -1) {
618 * Figure out what to _actually_ draw, and where to
622 int x0
, y0
, x1
, y1
, dx
, dy
;
626 * On the first pass, just blank the tile.
629 x
= COORD(X(state
, i
));
630 y
= COORD(Y(state
, i
));
639 * FIXME: must be prepared to draw a double
640 * tile in some situations.
644 * Find the coordinates of this tile in the old and
647 x1
= COORD(X(state
, i
));
648 y1
= COORD(Y(state
, i
));
649 for (j
= 0; j
< oldstate
->n
; j
++)
650 if (oldstate
->tiles
[j
] == state
->tiles
[i
])
652 assert(j
< oldstate
->n
);
653 x0
= COORD(X(state
, j
));
654 y0
= COORD(Y(state
, j
));
658 dx
!= TILE_SIZE
* state
->last_movement_sense
) {
659 dx
= (dx
< 0 ? dx
+ TILE_SIZE
* state
->w
:
660 dx
- TILE_SIZE
* state
->w
);
661 assert(abs(dx
) == TILE_SIZE
);
665 dy
!= TILE_SIZE
* state
->last_movement_sense
) {
666 dy
= (dy
< 0 ? dy
+ TILE_SIZE
* state
->h
:
667 dy
- TILE_SIZE
* state
->h
);
668 assert(abs(dy
) == TILE_SIZE
);
671 c
= (animtime
/ ANIM_TIME
);
672 if (c
< 0.0F
) c
= 0.0F
;
673 if (c
> 1.0F
) c
= 1.0F
;
675 x
= x0
+ (int)(c
* dx
);
676 y
= y0
+ (int)(c
* dy
);
677 x2
= x1
- dx
+ (int)(c
* dx
);
678 y2
= y1
- dy
+ (int)(c
* dy
);
684 x
= COORD(X(state
, i
));
685 y
= COORD(Y(state
, i
));
689 draw_tile(fe
, state
, x
, y
, t
, bgcolour
);
690 if (x2
!= -1 || y2
!= -1)
691 draw_tile(fe
, state
, x2
, y2
, t
, bgcolour
);
699 ds
->bgcolour
= bgcolour
;
702 * Update the status bar.
708 * Don't show the new status until we're also showing the
709 * new _state_ - after the game animation is complete.
714 sprintf(statusbuf
, "%sMoves: %d",
715 (state
->completed ?
"COMPLETED! " : ""),
716 (state
->completed ? state
->completed
: state
->movecount
));
718 status_bar(fe
, statusbuf
);
722 float game_anim_length(game_state
*oldstate
, game_state
*newstate
)
727 float game_flash_length(game_state
*oldstate
, game_state
*newstate
)
729 if (!oldstate
->completed
&& newstate
->completed
)
730 return 2 * FLASH_FRAME
;
735 int game_wants_statusbar(void)