| 1 | /* |
| 2 | * fifteen.c: standard 15-puzzle. |
| 3 | */ |
| 4 | |
| 5 | #include <stdio.h> |
| 6 | #include <stdlib.h> |
| 7 | #include <string.h> |
| 8 | #include <assert.h> |
| 9 | #include <ctype.h> |
| 10 | #include <math.h> |
| 11 | |
| 12 | #include "puzzles.h" |
| 13 | |
| 14 | #define TILE_SIZE 48 |
| 15 | #define BORDER (TILE_SIZE / 2) |
| 16 | #define HIGHLIGHT_WIDTH (TILE_SIZE / 20) |
| 17 | #define COORD(x) ( (x) * TILE_SIZE + BORDER ) |
| 18 | #define FROMCOORD(x) ( ((x) - BORDER + TILE_SIZE) / TILE_SIZE - 1 ) |
| 19 | |
| 20 | #define ANIM_TIME 0.13F |
| 21 | #define FLASH_FRAME 0.13F |
| 22 | |
| 23 | #define X(state, i) ( (i) % (state)->w ) |
| 24 | #define Y(state, i) ( (i) / (state)->w ) |
| 25 | #define C(state, x, y) ( (y) * (state)->w + (x) ) |
| 26 | |
| 27 | enum { |
| 28 | COL_BACKGROUND, |
| 29 | COL_TEXT, |
| 30 | COL_HIGHLIGHT, |
| 31 | COL_LOWLIGHT, |
| 32 | NCOLOURS |
| 33 | }; |
| 34 | |
| 35 | struct game_params { |
| 36 | int w, h; |
| 37 | }; |
| 38 | |
| 39 | struct game_state { |
| 40 | int w, h, n; |
| 41 | int *tiles; |
| 42 | int gap_pos; |
| 43 | int completed; |
| 44 | int movecount; |
| 45 | }; |
| 46 | |
| 47 | static game_params *default_params(void) |
| 48 | { |
| 49 | game_params *ret = snew(game_params); |
| 50 | |
| 51 | ret->w = ret->h = 4; |
| 52 | |
| 53 | return ret; |
| 54 | } |
| 55 | |
| 56 | static int game_fetch_preset(int i, char **name, game_params **params) |
| 57 | { |
| 58 | return FALSE; |
| 59 | } |
| 60 | |
| 61 | static void free_params(game_params *params) |
| 62 | { |
| 63 | sfree(params); |
| 64 | } |
| 65 | |
| 66 | static game_params *dup_params(game_params *params) |
| 67 | { |
| 68 | game_params *ret = snew(game_params); |
| 69 | *ret = *params; /* structure copy */ |
| 70 | return ret; |
| 71 | } |
| 72 | |
| 73 | static game_params *decode_params(char const *string) |
| 74 | { |
| 75 | game_params *ret = default_params(); |
| 76 | |
| 77 | ret->w = ret->h = atoi(string); |
| 78 | while (*string && isdigit(*string)) string++; |
| 79 | if (*string == 'x') { |
| 80 | string++; |
| 81 | ret->h = atoi(string); |
| 82 | } |
| 83 | |
| 84 | return ret; |
| 85 | } |
| 86 | |
| 87 | static char *encode_params(game_params *params) |
| 88 | { |
| 89 | char data[256]; |
| 90 | |
| 91 | sprintf(data, "%dx%d", params->w, params->h); |
| 92 | |
| 93 | return dupstr(data); |
| 94 | } |
| 95 | |
| 96 | static config_item *game_configure(game_params *params) |
| 97 | { |
| 98 | config_item *ret; |
| 99 | char buf[80]; |
| 100 | |
| 101 | ret = snewn(3, config_item); |
| 102 | |
| 103 | ret[0].name = "Width"; |
| 104 | ret[0].type = C_STRING; |
| 105 | sprintf(buf, "%d", params->w); |
| 106 | ret[0].sval = dupstr(buf); |
| 107 | ret[0].ival = 0; |
| 108 | |
| 109 | ret[1].name = "Height"; |
| 110 | ret[1].type = C_STRING; |
| 111 | sprintf(buf, "%d", params->h); |
| 112 | ret[1].sval = dupstr(buf); |
| 113 | ret[1].ival = 0; |
| 114 | |
| 115 | ret[2].name = NULL; |
| 116 | ret[2].type = C_END; |
| 117 | ret[2].sval = NULL; |
| 118 | ret[2].ival = 0; |
| 119 | |
| 120 | return ret; |
| 121 | } |
| 122 | |
| 123 | static game_params *custom_params(config_item *cfg) |
| 124 | { |
| 125 | game_params *ret = snew(game_params); |
| 126 | |
| 127 | ret->w = atoi(cfg[0].sval); |
| 128 | ret->h = atoi(cfg[1].sval); |
| 129 | |
| 130 | return ret; |
| 131 | } |
| 132 | |
| 133 | static char *validate_params(game_params *params) |
| 134 | { |
| 135 | if (params->w < 2 && params->h < 2) |
| 136 | return "Width and height must both be at least two"; |
| 137 | |
| 138 | return NULL; |
| 139 | } |
| 140 | |
| 141 | static int perm_parity(int *perm, int n) |
| 142 | { |
| 143 | int i, j, ret; |
| 144 | |
| 145 | ret = 0; |
| 146 | |
| 147 | for (i = 0; i < n-1; i++) |
| 148 | for (j = i+1; j < n; j++) |
| 149 | if (perm[i] > perm[j]) |
| 150 | ret = !ret; |
| 151 | |
| 152 | return ret; |
| 153 | } |
| 154 | |
| 155 | static char *new_game_seed(game_params *params, random_state *rs) |
| 156 | { |
| 157 | int gap, n, i, x; |
| 158 | int x1, x2, p1, p2, parity; |
| 159 | int *tiles, *used; |
| 160 | char *ret; |
| 161 | int retlen; |
| 162 | |
| 163 | n = params->w * params->h; |
| 164 | |
| 165 | tiles = snewn(n, int); |
| 166 | used = snewn(n, int); |
| 167 | |
| 168 | for (i = 0; i < n; i++) { |
| 169 | tiles[i] = -1; |
| 170 | used[i] = FALSE; |
| 171 | } |
| 172 | |
| 173 | gap = random_upto(rs, n); |
| 174 | tiles[gap] = 0; |
| 175 | used[0] = TRUE; |
| 176 | |
| 177 | /* |
| 178 | * Place everything else except the last two tiles. |
| 179 | */ |
| 180 | for (x = 0, i = n-1; i > 2; i--) { |
| 181 | int k = random_upto(rs, i); |
| 182 | int j; |
| 183 | |
| 184 | for (j = 0; j < n; j++) |
| 185 | if (!used[j] && (k-- == 0)) |
| 186 | break; |
| 187 | |
| 188 | assert(j < n && !used[j]); |
| 189 | used[j] = TRUE; |
| 190 | |
| 191 | while (tiles[x] >= 0) |
| 192 | x++; |
| 193 | assert(x < n); |
| 194 | tiles[x] = j; |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * Find the last two locations, and the last two pieces. |
| 199 | */ |
| 200 | while (tiles[x] >= 0) |
| 201 | x++; |
| 202 | assert(x < n); |
| 203 | x1 = x; |
| 204 | x++; |
| 205 | while (tiles[x] >= 0) |
| 206 | x++; |
| 207 | assert(x < n); |
| 208 | x2 = x; |
| 209 | |
| 210 | for (i = 0; i < n; i++) |
| 211 | if (!used[i]) |
| 212 | break; |
| 213 | p1 = i; |
| 214 | for (i = p1+1; i < n; i++) |
| 215 | if (!used[i]) |
| 216 | break; |
| 217 | p2 = i; |
| 218 | |
| 219 | /* |
| 220 | * Determine the required parity of the overall permutation. |
| 221 | * This is the XOR of: |
| 222 | * |
| 223 | * - The chessboard parity ((x^y)&1) of the gap square. The |
| 224 | * bottom right counts as even. |
| 225 | * |
| 226 | * - The parity of n. (The target permutation is 1,...,n-1,0 |
| 227 | * rather than 0,...,n-1; this is a cyclic permutation of |
| 228 | * the starting point and hence is odd iff n is even.) |
| 229 | */ |
| 230 | parity = ((X(params, gap) - (params->w-1)) ^ |
| 231 | (Y(params, gap) - (params->h-1)) ^ |
| 232 | (n+1)) & 1; |
| 233 | |
| 234 | /* |
| 235 | * Try the last two tiles one way round. If that fails, swap |
| 236 | * them. |
| 237 | */ |
| 238 | tiles[x1] = p1; |
| 239 | tiles[x2] = p2; |
| 240 | if (perm_parity(tiles, n) != parity) { |
| 241 | tiles[x1] = p2; |
| 242 | tiles[x2] = p1; |
| 243 | assert(perm_parity(tiles, n) == parity); |
| 244 | } |
| 245 | |
| 246 | /* |
| 247 | * Now construct the game seed, by describing the tile array as |
| 248 | * a simple sequence of comma-separated integers. |
| 249 | */ |
| 250 | ret = NULL; |
| 251 | retlen = 0; |
| 252 | for (i = 0; i < n; i++) { |
| 253 | char buf[80]; |
| 254 | int k; |
| 255 | |
| 256 | k = sprintf(buf, "%d,", tiles[i]); |
| 257 | |
| 258 | ret = sresize(ret, retlen + k + 1, char); |
| 259 | strcpy(ret + retlen, buf); |
| 260 | retlen += k; |
| 261 | } |
| 262 | ret[retlen-1] = '\0'; /* delete last comma */ |
| 263 | |
| 264 | sfree(tiles); |
| 265 | sfree(used); |
| 266 | |
| 267 | return ret; |
| 268 | } |
| 269 | |
| 270 | static char *validate_seed(game_params *params, char *seed) |
| 271 | { |
| 272 | char *p, *err; |
| 273 | int i, area; |
| 274 | int *used; |
| 275 | |
| 276 | area = params->w * params->h; |
| 277 | p = seed; |
| 278 | err = NULL; |
| 279 | |
| 280 | used = snewn(area, int); |
| 281 | for (i = 0; i < area; i++) |
| 282 | used[i] = FALSE; |
| 283 | |
| 284 | for (i = 0; i < area; i++) { |
| 285 | char *q = p; |
| 286 | int n; |
| 287 | |
| 288 | if (*p < '0' || *p > '9') { |
| 289 | err = "Not enough numbers in string"; |
| 290 | goto leave; |
| 291 | } |
| 292 | while (*p >= '0' && *p <= '9') |
| 293 | p++; |
| 294 | if (i < area-1 && *p != ',') { |
| 295 | err = "Expected comma after number"; |
| 296 | goto leave; |
| 297 | } |
| 298 | else if (i == area-1 && *p) { |
| 299 | err = "Excess junk at end of string"; |
| 300 | goto leave; |
| 301 | } |
| 302 | n = atoi(q); |
| 303 | if (n < 0 || n >= area) { |
| 304 | err = "Number out of range"; |
| 305 | goto leave; |
| 306 | } |
| 307 | if (used[n]) { |
| 308 | err = "Number used twice"; |
| 309 | goto leave; |
| 310 | } |
| 311 | used[n] = TRUE; |
| 312 | |
| 313 | if (*p) p++; /* eat comma */ |
| 314 | } |
| 315 | |
| 316 | leave: |
| 317 | sfree(used); |
| 318 | return err; |
| 319 | } |
| 320 | |
| 321 | static game_state *new_game(game_params *params, char *seed) |
| 322 | { |
| 323 | game_state *state = snew(game_state); |
| 324 | int i; |
| 325 | char *p; |
| 326 | |
| 327 | state->w = params->w; |
| 328 | state->h = params->h; |
| 329 | state->n = params->w * params->h; |
| 330 | state->tiles = snewn(state->n, int); |
| 331 | |
| 332 | state->gap_pos = 0; |
| 333 | p = seed; |
| 334 | i = 0; |
| 335 | for (i = 0; i < state->n; i++) { |
| 336 | assert(*p); |
| 337 | state->tiles[i] = atoi(p); |
| 338 | if (state->tiles[i] == 0) |
| 339 | state->gap_pos = i; |
| 340 | while (*p && *p != ',') |
| 341 | p++; |
| 342 | if (*p) p++; /* eat comma */ |
| 343 | } |
| 344 | assert(!*p); |
| 345 | assert(state->tiles[state->gap_pos] == 0); |
| 346 | |
| 347 | state->completed = state->movecount = 0; |
| 348 | |
| 349 | return state; |
| 350 | } |
| 351 | |
| 352 | static game_state *dup_game(game_state *state) |
| 353 | { |
| 354 | game_state *ret = snew(game_state); |
| 355 | |
| 356 | ret->w = state->w; |
| 357 | ret->h = state->h; |
| 358 | ret->n = state->n; |
| 359 | ret->tiles = snewn(state->w * state->h, int); |
| 360 | memcpy(ret->tiles, state->tiles, state->w * state->h * sizeof(int)); |
| 361 | ret->gap_pos = state->gap_pos; |
| 362 | ret->completed = state->completed; |
| 363 | ret->movecount = state->movecount; |
| 364 | |
| 365 | return ret; |
| 366 | } |
| 367 | |
| 368 | static void free_game(game_state *state) |
| 369 | { |
| 370 | sfree(state); |
| 371 | } |
| 372 | |
| 373 | static game_ui *new_ui(game_state *state) |
| 374 | { |
| 375 | return NULL; |
| 376 | } |
| 377 | |
| 378 | static void free_ui(game_ui *ui) |
| 379 | { |
| 380 | } |
| 381 | |
| 382 | static game_state *make_move(game_state *from, game_ui *ui, |
| 383 | int x, int y, int button) |
| 384 | { |
| 385 | int gx, gy, dx, dy, ux, uy, up, p; |
| 386 | game_state *ret; |
| 387 | |
| 388 | gx = X(from, from->gap_pos); |
| 389 | gy = Y(from, from->gap_pos); |
| 390 | |
| 391 | if (button == CURSOR_RIGHT && gx > 0) |
| 392 | dx = gx - 1, dy = gy; |
| 393 | else if (button == CURSOR_LEFT && gx < from->w-1) |
| 394 | dx = gx + 1, dy = gy; |
| 395 | else if (button == CURSOR_DOWN && gy > 0) |
| 396 | dy = gy - 1, dx = gx; |
| 397 | else if (button == CURSOR_UP && gy < from->h-1) |
| 398 | dy = gy + 1, dx = gx; |
| 399 | else if (button == LEFT_BUTTON) { |
| 400 | dx = FROMCOORD(x); |
| 401 | dy = FROMCOORD(y); |
| 402 | if (dx < 0 || dx >= from->w || dy < 0 || dy >= from->h) |
| 403 | return NULL; /* out of bounds */ |
| 404 | /* |
| 405 | * Any click location should be equal to the gap location |
| 406 | * in _precisely_ one coordinate. |
| 407 | */ |
| 408 | if ((dx == gx && dy == gy) || (dx != gx && dy != gy)) |
| 409 | return NULL; |
| 410 | } else |
| 411 | return NULL; /* no move */ |
| 412 | |
| 413 | /* |
| 414 | * Find the unit displacement from the original gap |
| 415 | * position towards this one. |
| 416 | */ |
| 417 | ux = (dx < gx ? -1 : dx > gx ? +1 : 0); |
| 418 | uy = (dy < gy ? -1 : dy > gy ? +1 : 0); |
| 419 | up = C(from, ux, uy); |
| 420 | |
| 421 | ret = dup_game(from); |
| 422 | |
| 423 | ret->gap_pos = C(from, dx, dy); |
| 424 | assert(ret->gap_pos >= 0 && ret->gap_pos < ret->n); |
| 425 | |
| 426 | ret->tiles[ret->gap_pos] = 0; |
| 427 | |
| 428 | for (p = from->gap_pos; p != ret->gap_pos; p += up) { |
| 429 | assert(p >= 0 && p < from->n); |
| 430 | ret->tiles[p] = from->tiles[p + up]; |
| 431 | ret->movecount++; |
| 432 | } |
| 433 | |
| 434 | /* |
| 435 | * See if the game has been completed. |
| 436 | */ |
| 437 | if (!ret->completed) { |
| 438 | ret->completed = ret->movecount; |
| 439 | for (p = 0; p < ret->n; p++) |
| 440 | if (ret->tiles[p] != (p < ret->n-1 ? p+1 : 0)) |
| 441 | ret->completed = 0; |
| 442 | } |
| 443 | |
| 444 | return ret; |
| 445 | } |
| 446 | |
| 447 | /* ---------------------------------------------------------------------- |
| 448 | * Drawing routines. |
| 449 | */ |
| 450 | |
| 451 | struct game_drawstate { |
| 452 | int started; |
| 453 | int w, h, bgcolour; |
| 454 | int *tiles; |
| 455 | }; |
| 456 | |
| 457 | static void game_size(game_params *params, int *x, int *y) |
| 458 | { |
| 459 | *x = TILE_SIZE * params->w + 2 * BORDER; |
| 460 | *y = TILE_SIZE * params->h + 2 * BORDER; |
| 461 | } |
| 462 | |
| 463 | static float *game_colours(frontend *fe, game_state *state, int *ncolours) |
| 464 | { |
| 465 | float *ret = snewn(3 * NCOLOURS, float); |
| 466 | int i; |
| 467 | float max; |
| 468 | |
| 469 | frontend_default_colour(fe, &ret[COL_BACKGROUND * 3]); |
| 470 | |
| 471 | /* |
| 472 | * Drop the background colour so that the highlight is |
| 473 | * noticeably brighter than it while still being under 1. |
| 474 | */ |
| 475 | max = ret[COL_BACKGROUND*3]; |
| 476 | for (i = 1; i < 3; i++) |
| 477 | if (ret[COL_BACKGROUND*3+i] > max) |
| 478 | max = ret[COL_BACKGROUND*3+i]; |
| 479 | if (max * 1.2F > 1.0F) { |
| 480 | for (i = 0; i < 3; i++) |
| 481 | ret[COL_BACKGROUND*3+i] /= (max * 1.2F); |
| 482 | } |
| 483 | |
| 484 | for (i = 0; i < 3; i++) { |
| 485 | ret[COL_HIGHLIGHT * 3 + i] = ret[COL_BACKGROUND * 3 + i] * 1.2F; |
| 486 | ret[COL_LOWLIGHT * 3 + i] = ret[COL_BACKGROUND * 3 + i] * 0.8F; |
| 487 | ret[COL_TEXT * 3 + i] = 0.0; |
| 488 | } |
| 489 | |
| 490 | *ncolours = NCOLOURS; |
| 491 | return ret; |
| 492 | } |
| 493 | |
| 494 | static game_drawstate *game_new_drawstate(game_state *state) |
| 495 | { |
| 496 | struct game_drawstate *ds = snew(struct game_drawstate); |
| 497 | int i; |
| 498 | |
| 499 | ds->started = FALSE; |
| 500 | ds->w = state->w; |
| 501 | ds->h = state->h; |
| 502 | ds->bgcolour = COL_BACKGROUND; |
| 503 | ds->tiles = snewn(ds->w*ds->h, int); |
| 504 | for (i = 0; i < ds->w*ds->h; i++) |
| 505 | ds->tiles[i] = -1; |
| 506 | |
| 507 | return ds; |
| 508 | } |
| 509 | |
| 510 | static void game_free_drawstate(game_drawstate *ds) |
| 511 | { |
| 512 | sfree(ds->tiles); |
| 513 | sfree(ds); |
| 514 | } |
| 515 | |
| 516 | static void draw_tile(frontend *fe, game_state *state, int x, int y, |
| 517 | int tile, int flash_colour) |
| 518 | { |
| 519 | if (tile == 0) { |
| 520 | draw_rect(fe, x, y, TILE_SIZE, TILE_SIZE, |
| 521 | flash_colour); |
| 522 | } else { |
| 523 | int coords[6]; |
| 524 | char str[40]; |
| 525 | |
| 526 | coords[0] = x + TILE_SIZE - 1; |
| 527 | coords[1] = y + TILE_SIZE - 1; |
| 528 | coords[2] = x + TILE_SIZE - 1; |
| 529 | coords[3] = y; |
| 530 | coords[4] = x; |
| 531 | coords[5] = y + TILE_SIZE - 1; |
| 532 | draw_polygon(fe, coords, 3, TRUE, COL_LOWLIGHT); |
| 533 | draw_polygon(fe, coords, 3, FALSE, COL_LOWLIGHT); |
| 534 | |
| 535 | coords[0] = x; |
| 536 | coords[1] = y; |
| 537 | draw_polygon(fe, coords, 3, TRUE, COL_HIGHLIGHT); |
| 538 | draw_polygon(fe, coords, 3, FALSE, COL_HIGHLIGHT); |
| 539 | |
| 540 | draw_rect(fe, x + HIGHLIGHT_WIDTH, y + HIGHLIGHT_WIDTH, |
| 541 | TILE_SIZE - 2*HIGHLIGHT_WIDTH, TILE_SIZE - 2*HIGHLIGHT_WIDTH, |
| 542 | flash_colour); |
| 543 | |
| 544 | sprintf(str, "%d", tile); |
| 545 | draw_text(fe, x + TILE_SIZE/2, y + TILE_SIZE/2, |
| 546 | FONT_VARIABLE, TILE_SIZE/3, ALIGN_VCENTRE | ALIGN_HCENTRE, |
| 547 | COL_TEXT, str); |
| 548 | } |
| 549 | draw_update(fe, x, y, TILE_SIZE, TILE_SIZE); |
| 550 | } |
| 551 | |
| 552 | static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate, |
| 553 | game_state *state, int dir, game_ui *ui, |
| 554 | float animtime, float flashtime) |
| 555 | { |
| 556 | int i, pass, bgcolour; |
| 557 | |
| 558 | if (flashtime > 0) { |
| 559 | int frame = (int)(flashtime / FLASH_FRAME); |
| 560 | bgcolour = (frame % 2 ? COL_LOWLIGHT : COL_HIGHLIGHT); |
| 561 | } else |
| 562 | bgcolour = COL_BACKGROUND; |
| 563 | |
| 564 | if (!ds->started) { |
| 565 | int coords[6]; |
| 566 | |
| 567 | draw_rect(fe, 0, 0, |
| 568 | TILE_SIZE * state->w + 2 * BORDER, |
| 569 | TILE_SIZE * state->h + 2 * BORDER, COL_BACKGROUND); |
| 570 | draw_update(fe, 0, 0, |
| 571 | TILE_SIZE * state->w + 2 * BORDER, |
| 572 | TILE_SIZE * state->h + 2 * BORDER); |
| 573 | |
| 574 | /* |
| 575 | * Recessed area containing the whole puzzle. |
| 576 | */ |
| 577 | coords[0] = COORD(state->w) + HIGHLIGHT_WIDTH - 1; |
| 578 | coords[1] = COORD(state->h) + HIGHLIGHT_WIDTH - 1; |
| 579 | coords[2] = COORD(state->w) + HIGHLIGHT_WIDTH - 1; |
| 580 | coords[3] = COORD(0) - HIGHLIGHT_WIDTH; |
| 581 | coords[4] = COORD(0) - HIGHLIGHT_WIDTH; |
| 582 | coords[5] = COORD(state->h) + HIGHLIGHT_WIDTH - 1; |
| 583 | draw_polygon(fe, coords, 3, TRUE, COL_HIGHLIGHT); |
| 584 | draw_polygon(fe, coords, 3, FALSE, COL_HIGHLIGHT); |
| 585 | |
| 586 | coords[1] = COORD(0) - HIGHLIGHT_WIDTH; |
| 587 | coords[0] = COORD(0) - HIGHLIGHT_WIDTH; |
| 588 | draw_polygon(fe, coords, 3, TRUE, COL_LOWLIGHT); |
| 589 | draw_polygon(fe, coords, 3, FALSE, COL_LOWLIGHT); |
| 590 | |
| 591 | ds->started = TRUE; |
| 592 | } |
| 593 | |
| 594 | /* |
| 595 | * Now draw each tile. We do this in two passes to make |
| 596 | * animation easy. |
| 597 | */ |
| 598 | for (pass = 0; pass < 2; pass++) { |
| 599 | for (i = 0; i < state->n; i++) { |
| 600 | int t, t0; |
| 601 | /* |
| 602 | * Figure out what should be displayed at this |
| 603 | * location. It's either a simple tile, or it's a |
| 604 | * transition between two tiles (in which case we say |
| 605 | * -1 because it must always be drawn). |
| 606 | */ |
| 607 | |
| 608 | if (oldstate && oldstate->tiles[i] != state->tiles[i]) |
| 609 | t = -1; |
| 610 | else |
| 611 | t = state->tiles[i]; |
| 612 | |
| 613 | t0 = t; |
| 614 | |
| 615 | if (ds->bgcolour != bgcolour || /* always redraw when flashing */ |
| 616 | ds->tiles[i] != t || ds->tiles[i] == -1 || t == -1) { |
| 617 | int x, y; |
| 618 | |
| 619 | /* |
| 620 | * Figure out what to _actually_ draw, and where to |
| 621 | * draw it. |
| 622 | */ |
| 623 | if (t == -1) { |
| 624 | int x0, y0, x1, y1; |
| 625 | int j; |
| 626 | |
| 627 | /* |
| 628 | * On the first pass, just blank the tile. |
| 629 | */ |
| 630 | if (pass == 0) { |
| 631 | x = COORD(X(state, i)); |
| 632 | y = COORD(Y(state, i)); |
| 633 | t = 0; |
| 634 | } else { |
| 635 | float c; |
| 636 | |
| 637 | t = state->tiles[i]; |
| 638 | |
| 639 | /* |
| 640 | * Don't bother moving the gap; just don't |
| 641 | * draw it. |
| 642 | */ |
| 643 | if (t == 0) |
| 644 | continue; |
| 645 | |
| 646 | /* |
| 647 | * Find the coordinates of this tile in the old and |
| 648 | * new states. |
| 649 | */ |
| 650 | x1 = COORD(X(state, i)); |
| 651 | y1 = COORD(Y(state, i)); |
| 652 | for (j = 0; j < oldstate->n; j++) |
| 653 | if (oldstate->tiles[j] == state->tiles[i]) |
| 654 | break; |
| 655 | assert(j < oldstate->n); |
| 656 | x0 = COORD(X(state, j)); |
| 657 | y0 = COORD(Y(state, j)); |
| 658 | |
| 659 | c = (animtime / ANIM_TIME); |
| 660 | if (c < 0.0F) c = 0.0F; |
| 661 | if (c > 1.0F) c = 1.0F; |
| 662 | |
| 663 | x = x0 + (int)(c * (x1 - x0)); |
| 664 | y = y0 + (int)(c * (y1 - y0)); |
| 665 | } |
| 666 | |
| 667 | } else { |
| 668 | if (pass == 0) |
| 669 | continue; |
| 670 | x = COORD(X(state, i)); |
| 671 | y = COORD(Y(state, i)); |
| 672 | } |
| 673 | |
| 674 | draw_tile(fe, state, x, y, t, bgcolour); |
| 675 | } |
| 676 | ds->tiles[i] = t0; |
| 677 | } |
| 678 | } |
| 679 | ds->bgcolour = bgcolour; |
| 680 | |
| 681 | /* |
| 682 | * Update the status bar. |
| 683 | */ |
| 684 | { |
| 685 | char statusbuf[256]; |
| 686 | |
| 687 | /* |
| 688 | * Don't show the new status until we're also showing the |
| 689 | * new _state_ - after the game animation is complete. |
| 690 | */ |
| 691 | if (oldstate) |
| 692 | state = oldstate; |
| 693 | |
| 694 | sprintf(statusbuf, "%sMoves: %d", |
| 695 | (state->completed ? "COMPLETED! " : ""), |
| 696 | (state->completed ? state->completed : state->movecount)); |
| 697 | |
| 698 | status_bar(fe, statusbuf); |
| 699 | } |
| 700 | } |
| 701 | |
| 702 | static float game_anim_length(game_state *oldstate, |
| 703 | game_state *newstate, int dir) |
| 704 | { |
| 705 | return ANIM_TIME; |
| 706 | } |
| 707 | |
| 708 | static float game_flash_length(game_state *oldstate, |
| 709 | game_state *newstate, int dir) |
| 710 | { |
| 711 | if (!oldstate->completed && newstate->completed) |
| 712 | return 2 * FLASH_FRAME; |
| 713 | else |
| 714 | return 0.0F; |
| 715 | } |
| 716 | |
| 717 | static int game_wants_statusbar(void) |
| 718 | { |
| 719 | return TRUE; |
| 720 | } |
| 721 | |
| 722 | #ifdef COMBINED |
| 723 | #define thegame fifteen |
| 724 | #endif |
| 725 | |
| 726 | const struct game thegame = { |
| 727 | "Fifteen", "games.fifteen", TRUE, |
| 728 | default_params, |
| 729 | game_fetch_preset, |
| 730 | decode_params, |
| 731 | encode_params, |
| 732 | free_params, |
| 733 | dup_params, |
| 734 | game_configure, |
| 735 | custom_params, |
| 736 | validate_params, |
| 737 | new_game_seed, |
| 738 | validate_seed, |
| 739 | new_game, |
| 740 | dup_game, |
| 741 | free_game, |
| 742 | new_ui, |
| 743 | free_ui, |
| 744 | make_move, |
| 745 | game_size, |
| 746 | game_colours, |
| 747 | game_new_drawstate, |
| 748 | game_free_drawstate, |
| 749 | game_redraw, |
| 750 | game_anim_length, |
| 751 | game_flash_length, |
| 752 | game_wants_statusbar, |
| 753 | }; |