15 #define PI 3.141592653589793238462643383279502884197169399
17 #define MATMUL(xr,yr,m,x,y) do { \
18 float rx, ry, xx = (x), yy = (y), *mat = (m); \
19 rx = mat[0] * xx + mat[2] * yy; \
20 ry = mat[1] * xx + mat[3] * yy; \
21 (xr) = rx; (yr) = ry; \
24 /* Direction and other bitfields */
31 /* Corner flags go in the barriers array */
37 /* Rotations: Anticlockwise, Clockwise, Flip, general rotate */
38 #define A(x) ( (((x) & 0x07) << 1) | (((x) & 0x08) >> 3) )
39 #define C(x) ( (((x) & 0x0E) >> 1) | (((x) & 0x01) << 3) )
40 #define F(x) ( (((x) & 0x0C) >> 2) | (((x) & 0x03) << 2) )
41 #define ROT(x, n) ( ((n)&3) == 0 ? (x) : \
42 ((n)&3) == 1 ? A(x) : \
43 ((n)&3) == 2 ? F(x) : C(x) )
45 /* X and Y displacements */
46 #define X(x) ( (x) == R ? +1 : (x) == L ? -1 : 0 )
47 #define Y(x) ( (x) == D ? +1 : (x) == U ? -1 : 0 )
50 #define COUNT(x) ( (((x) & 0x08) >> 3) + (((x) & 0x04) >> 2) + \
51 (((x) & 0x02) >> 1) + ((x) & 0x01) )
55 #define WINDOW_OFFSET 16
57 #define ROTATE_TIME 0.13F
58 #define FLASH_FRAME 0.07F
75 float barrier_probability;
79 int width, height, cx, cy, wrapping, completed, last_rotate_dir;
81 unsigned char *barriers;
84 #define OFFSET(x2,y2,x1,y1,dir,state) \
85 ( (x2) = ((x1) + (state)->width + X((dir))) % (state)->width, \
86 (y2) = ((y1) + (state)->height + Y((dir))) % (state)->height)
88 #define index(state, a, x, y) ( a[(y) * (state)->width + (x)] )
89 #define tile(state, x, y) index(state, (state)->tiles, x, y)
90 #define barrier(state, x, y) index(state, (state)->barriers, x, y)
96 static int xyd_cmp(void *av, void *bv) {
97 struct xyd *a = (struct xyd *)av;
98 struct xyd *b = (struct xyd *)bv;
107 if (a->direction < b->direction)
109 if (a->direction > b->direction)
114 static struct xyd *new_xyd(int x, int y, int direction)
116 struct xyd *xyd = snew(struct xyd);
119 xyd->direction = direction;
123 /* ----------------------------------------------------------------------
124 * Manage game parameters.
126 static game_params *default_params(void)
128 game_params *ret = snew(game_params);
132 ret->wrapping = FALSE;
133 ret->barrier_probability = 0.0;
138 static int game_fetch_preset(int i, char **name, game_params **params)
142 static const struct { int x, y, wrap; } values[] = {
155 if (i < 0 || i >= lenof(values))
158 ret = snew(game_params);
159 ret->width = values[i].x;
160 ret->height = values[i].y;
161 ret->wrapping = values[i].wrap;
162 ret->barrier_probability = 0.0;
164 sprintf(str, "%dx%d%s", ret->width, ret->height,
165 ret->wrapping ? " wrapping" : "");
172 static void free_params(game_params *params)
177 static game_params *dup_params(game_params *params)
179 game_params *ret = snew(game_params);
180 *ret = *params; /* structure copy */
184 static game_params *decode_params(char const *string)
186 game_params *ret = default_params();
187 char const *p = string;
189 ret->width = atoi(p);
190 while (*p && isdigit(*p)) p++;
193 ret->height = atoi(p);
194 while (*p && isdigit(*p)) p++;
195 if ( (ret->wrapping = (*p == 'w')) != 0 )
198 ret->barrier_probability = atof(p+1);
200 ret->height = ret->width;
206 static char *encode_params(game_params *params)
211 len = sprintf(ret, "%dx%d", params->width, params->height);
212 if (params->wrapping)
214 if (params->barrier_probability)
215 len += sprintf(ret+len, "b%g", params->barrier_probability);
216 assert(len < lenof(ret));
222 static config_item *game_configure(game_params *params)
227 ret = snewn(5, config_item);
229 ret[0].name = "Width";
230 ret[0].type = C_STRING;
231 sprintf(buf, "%d", params->width);
232 ret[0].sval = dupstr(buf);
235 ret[1].name = "Height";
236 ret[1].type = C_STRING;
237 sprintf(buf, "%d", params->height);
238 ret[1].sval = dupstr(buf);
241 ret[2].name = "Walls wrap around";
242 ret[2].type = C_BOOLEAN;
244 ret[2].ival = params->wrapping;
246 ret[3].name = "Barrier probability";
247 ret[3].type = C_STRING;
248 sprintf(buf, "%g", params->barrier_probability);
249 ret[3].sval = dupstr(buf);
260 static game_params *custom_params(config_item *cfg)
262 game_params *ret = snew(game_params);
264 ret->width = atoi(cfg[0].sval);
265 ret->height = atoi(cfg[1].sval);
266 ret->wrapping = cfg[2].ival;
267 ret->barrier_probability = (float)atof(cfg[3].sval);
272 static char *validate_params(game_params *params)
274 if (params->width <= 0 && params->height <= 0)
275 return "Width and height must both be greater than zero";
276 if (params->width <= 0)
277 return "Width must be greater than zero";
278 if (params->height <= 0)
279 return "Height must be greater than zero";
280 if (params->width <= 1 && params->height <= 1)
281 return "At least one of width and height must be greater than one";
282 if (params->barrier_probability < 0)
283 return "Barrier probability may not be negative";
284 if (params->barrier_probability > 1)
285 return "Barrier probability may not be greater than 1";
289 /* ----------------------------------------------------------------------
290 * Randomly select a new game seed.
293 static char *new_game_seed(game_params *params, random_state *rs)
296 * The full description of a Net game is far too large to
297 * encode directly in the seed, so by default we'll have to go
298 * for the simple approach of providing a random-number seed.
300 * (This does not restrict me from _later on_ inventing a seed
301 * string syntax which can never be generated by this code -
302 * for example, strings beginning with a letter - allowing me
303 * to type in a precise game, and have new_game detect it and
304 * understand it and do something completely different.)
307 sprintf(buf, "%lu", random_bits(rs, 32));
311 static char *validate_seed(game_params *params, char *seed)
314 * Since any string at all will suffice to seed the RNG, there
315 * is no validation required.
320 /* ----------------------------------------------------------------------
321 * Construct an initial game state, given a seed and parameters.
324 static game_state *new_game(game_params *params, char *seed)
328 tree234 *possibilities, *barriers;
329 int w, h, x, y, nbarriers;
331 assert(params->width > 0 && params->height > 0);
332 assert(params->width > 1 || params->height > 1);
335 * Create a blank game state.
337 state = snew(game_state);
338 w = state->width = params->width;
339 h = state->height = params->height;
340 state->cx = state->width / 2;
341 state->cy = state->height / 2;
342 state->wrapping = params->wrapping;
343 state->last_rotate_dir = 0;
344 state->completed = FALSE;
345 state->tiles = snewn(state->width * state->height, unsigned char);
346 memset(state->tiles, 0, state->width * state->height);
347 state->barriers = snewn(state->width * state->height, unsigned char);
348 memset(state->barriers, 0, state->width * state->height);
351 * Set up border barriers if this is a non-wrapping game.
353 if (!state->wrapping) {
354 for (x = 0; x < state->width; x++) {
355 barrier(state, x, 0) |= U;
356 barrier(state, x, state->height-1) |= D;
358 for (y = 0; y < state->height; y++) {
359 barrier(state, 0, y) |= L;
360 barrier(state, state->width-1, y) |= R;
365 * Seed the internal random number generator.
367 rs = random_init(seed, strlen(seed));
370 * Construct the unshuffled grid.
372 * To do this, we simply start at the centre point, repeatedly
373 * choose a random possibility out of the available ways to
374 * extend a used square into an unused one, and do it. After
375 * extending the third line out of a square, we remove the
376 * fourth from the possibilities list to avoid any full-cross
377 * squares (which would make the game too easy because they
378 * only have one orientation).
380 * The slightly worrying thing is the avoidance of full-cross
381 * squares. Can this cause our unsophisticated construction
382 * algorithm to paint itself into a corner, by getting into a
383 * situation where there are some unreached squares and the
384 * only way to reach any of them is to extend a T-piece into a
387 * Answer: no it can't, and here's a proof.
389 * Any contiguous group of such unreachable squares must be
390 * surrounded on _all_ sides by T-pieces pointing away from the
391 * group. (If not, then there is a square which can be extended
392 * into one of the `unreachable' ones, and so it wasn't
393 * unreachable after all.) In particular, this implies that
394 * each contiguous group of unreachable squares must be
395 * rectangular in shape (any deviation from that yields a
396 * non-T-piece next to an `unreachable' square).
398 * So we have a rectangle of unreachable squares, with T-pieces
399 * forming a solid border around the rectangle. The corners of
400 * that border must be connected (since every tile connects all
401 * the lines arriving in it), and therefore the border must
402 * form a closed loop around the rectangle.
404 * But this can't have happened in the first place, since we
405 * _know_ we've avoided creating closed loops! Hence, no such
406 * situation can ever arise, and the naive grid construction
407 * algorithm will guaranteeably result in a complete grid
408 * containing no unreached squares, no full crosses _and_ no
411 possibilities = newtree234(xyd_cmp);
413 if (state->cx+1 < state->width)
414 add234(possibilities, new_xyd(state->cx, state->cy, R));
415 if (state->cy-1 >= 0)
416 add234(possibilities, new_xyd(state->cx, state->cy, U));
417 if (state->cx-1 >= 0)
418 add234(possibilities, new_xyd(state->cx, state->cy, L));
419 if (state->cy+1 < state->height)
420 add234(possibilities, new_xyd(state->cx, state->cy, D));
422 while (count234(possibilities) > 0) {
425 int x1, y1, d1, x2, y2, d2, d;
428 * Extract a randomly chosen possibility from the list.
430 i = random_upto(rs, count234(possibilities));
431 xyd = delpos234(possibilities, i);
437 OFFSET(x2, y2, x1, y1, d1, state);
440 printf("picked (%d,%d,%c) <-> (%d,%d,%c)\n",
441 x1, y1, "0RU3L567D9abcdef"[d1], x2, y2, "0RU3L567D9abcdef"[d2]);
445 * Make the connection. (We should be moving to an as yet
448 tile(state, x1, y1) |= d1;
449 assert(tile(state, x2, y2) == 0);
450 tile(state, x2, y2) |= d2;
453 * If we have created a T-piece, remove its last
456 if (COUNT(tile(state, x1, y1)) == 3) {
457 struct xyd xyd1, *xydp;
461 xyd1.direction = 0x0F ^ tile(state, x1, y1);
463 xydp = find234(possibilities, &xyd1, NULL);
467 printf("T-piece; removing (%d,%d,%c)\n",
468 xydp->x, xydp->y, "0RU3L567D9abcdef"[xydp->direction]);
470 del234(possibilities, xydp);
476 * Remove all other possibilities that were pointing at the
477 * tile we've just moved into.
479 for (d = 1; d < 0x10; d <<= 1) {
481 struct xyd xyd1, *xydp;
483 OFFSET(x3, y3, x2, y2, d, state);
490 xydp = find234(possibilities, &xyd1, NULL);
494 printf("Loop avoidance; removing (%d,%d,%c)\n",
495 xydp->x, xydp->y, "0RU3L567D9abcdef"[xydp->direction]);
497 del234(possibilities, xydp);
503 * Add new possibilities to the list for moving _out_ of
504 * the tile we have just moved into.
506 for (d = 1; d < 0x10; d <<= 1) {
510 continue; /* we've got this one already */
512 if (!state->wrapping) {
513 if (d == U && y2 == 0)
515 if (d == D && y2 == state->height-1)
517 if (d == L && x2 == 0)
519 if (d == R && x2 == state->width-1)
523 OFFSET(x3, y3, x2, y2, d, state);
525 if (tile(state, x3, y3))
526 continue; /* this would create a loop */
529 printf("New frontier; adding (%d,%d,%c)\n",
530 x2, y2, "0RU3L567D9abcdef"[d]);
532 add234(possibilities, new_xyd(x2, y2, d));
535 /* Having done that, we should have no possibilities remaining. */
536 assert(count234(possibilities) == 0);
537 freetree234(possibilities);
540 * Now compute a list of the possible barrier locations.
542 barriers = newtree234(xyd_cmp);
543 for (y = 0; y < state->height; y++) {
544 for (x = 0; x < state->width; x++) {
546 if (!(tile(state, x, y) & R) &&
547 (state->wrapping || x < state->width-1))
548 add234(barriers, new_xyd(x, y, R));
549 if (!(tile(state, x, y) & D) &&
550 (state->wrapping || y < state->height-1))
551 add234(barriers, new_xyd(x, y, D));
556 * Now shuffle the grid.
558 for (y = 0; y < state->height; y++) {
559 for (x = 0; x < state->width; x++) {
560 int orig = tile(state, x, y);
561 int rot = random_upto(rs, 4);
562 tile(state, x, y) = ROT(orig, rot);
567 * And now choose barrier locations. (We carefully do this
568 * _after_ shuffling, so that changing the barrier rate in the
569 * params while keeping the game seed the same will give the
570 * same shuffled grid and _only_ change the barrier locations.
571 * Also the way we choose barrier locations, by repeatedly
572 * choosing one possibility from the list until we have enough,
573 * is designed to ensure that raising the barrier rate while
574 * keeping the seed the same will provide a superset of the
575 * previous barrier set - i.e. if you ask for 10 barriers, and
576 * then decide that's still too hard and ask for 20, you'll get
577 * the original 10 plus 10 more, rather than getting 20 new
578 * ones and the chance of remembering your first 10.)
580 nbarriers = (int)(params->barrier_probability * count234(barriers));
581 assert(nbarriers >= 0 && nbarriers <= count234(barriers));
583 while (nbarriers > 0) {
586 int x1, y1, d1, x2, y2, d2;
589 * Extract a randomly chosen barrier from the list.
591 i = random_upto(rs, count234(barriers));
592 xyd = delpos234(barriers, i);
601 OFFSET(x2, y2, x1, y1, d1, state);
604 barrier(state, x1, y1) |= d1;
605 barrier(state, x2, y2) |= d2;
611 * Clean up the rest of the barrier list.
616 while ( (xyd = delpos234(barriers, 0)) != NULL)
619 freetree234(barriers);
623 * Set up the barrier corner flags, for drawing barriers
624 * prettily when they meet.
626 for (y = 0; y < state->height; y++) {
627 for (x = 0; x < state->width; x++) {
630 for (dir = 1; dir < 0x10; dir <<= 1) {
632 int x1, y1, x2, y2, x3, y3;
635 if (!(barrier(state, x, y) & dir))
638 if (barrier(state, x, y) & dir2)
641 x1 = x + X(dir), y1 = y + Y(dir);
642 if (x1 >= 0 && x1 < state->width &&
643 y1 >= 0 && y1 < state->height &&
644 (barrier(state, x1, y1) & dir2))
647 x2 = x + X(dir2), y2 = y + Y(dir2);
648 if (x2 >= 0 && x2 < state->width &&
649 y2 >= 0 && y2 < state->height &&
650 (barrier(state, x2, y2) & dir))
654 barrier(state, x, y) |= (dir << 4);
655 if (x1 >= 0 && x1 < state->width &&
656 y1 >= 0 && y1 < state->height)
657 barrier(state, x1, y1) |= (A(dir) << 4);
658 if (x2 >= 0 && x2 < state->width &&
659 y2 >= 0 && y2 < state->height)
660 barrier(state, x2, y2) |= (C(dir) << 4);
661 x3 = x + X(dir) + X(dir2), y3 = y + Y(dir) + Y(dir2);
662 if (x3 >= 0 && x3 < state->width &&
663 y3 >= 0 && y3 < state->height)
664 barrier(state, x3, y3) |= (F(dir) << 4);
675 static game_state *dup_game(game_state *state)
679 ret = snew(game_state);
680 ret->width = state->width;
681 ret->height = state->height;
684 ret->wrapping = state->wrapping;
685 ret->completed = state->completed;
686 ret->last_rotate_dir = state->last_rotate_dir;
687 ret->tiles = snewn(state->width * state->height, unsigned char);
688 memcpy(ret->tiles, state->tiles, state->width * state->height);
689 ret->barriers = snewn(state->width * state->height, unsigned char);
690 memcpy(ret->barriers, state->barriers, state->width * state->height);
695 static void free_game(game_state *state)
698 sfree(state->barriers);
702 /* ----------------------------------------------------------------------
707 * Compute which squares are reachable from the centre square, as a
708 * quick visual aid to determining how close the game is to
709 * completion. This is also a simple way to tell if the game _is_
710 * completed - just call this function and see whether every square
713 static unsigned char *compute_active(game_state *state)
715 unsigned char *active;
719 active = snewn(state->width * state->height, unsigned char);
720 memset(active, 0, state->width * state->height);
723 * We only store (x,y) pairs in todo, but it's easier to reuse
724 * xyd_cmp and just store direction 0 every time.
726 todo = newtree234(xyd_cmp);
727 index(state, active, state->cx, state->cy) = ACTIVE;
728 add234(todo, new_xyd(state->cx, state->cy, 0));
730 while ( (xyd = delpos234(todo, 0)) != NULL) {
731 int x1, y1, d1, x2, y2, d2;
737 for (d1 = 1; d1 < 0x10; d1 <<= 1) {
738 OFFSET(x2, y2, x1, y1, d1, state);
742 * If the next tile in this direction is connected to
743 * us, and there isn't a barrier in the way, and it
744 * isn't already marked active, then mark it active and
745 * add it to the to-examine list.
747 if ((tile(state, x1, y1) & d1) &&
748 (tile(state, x2, y2) & d2) &&
749 !(barrier(state, x1, y1) & d1) &&
750 !index(state, active, x2, y2)) {
751 index(state, active, x2, y2) = ACTIVE;
752 add234(todo, new_xyd(x2, y2, 0));
756 /* Now we expect the todo list to have shrunk to zero size. */
757 assert(count234(todo) == 0);
766 random_state *rs; /* used for jumbling */
769 static game_ui *new_ui(game_state *state)
773 game_ui *ui = snew(game_ui);
774 ui->cur_x = state->width / 2;
775 ui->cur_y = state->height / 2;
776 ui->cur_visible = FALSE;
777 get_random_seed(&seed, &seedsize);
778 ui->rs = random_init(seed, seedsize);
784 static void free_ui(game_ui *ui)
790 /* ----------------------------------------------------------------------
793 static game_state *make_move(game_state *state, game_ui *ui,
794 int x, int y, int button)
796 game_state *ret, *nullret;
801 if (button == LEFT_BUTTON ||
802 button == MIDDLE_BUTTON ||
803 button == RIGHT_BUTTON) {
805 if (ui->cur_visible) {
806 ui->cur_visible = FALSE;
811 * The button must have been clicked on a valid tile.
813 x -= WINDOW_OFFSET + TILE_BORDER;
814 y -= WINDOW_OFFSET + TILE_BORDER;
819 if (tx >= state->width || ty >= state->height)
821 if (x % TILE_SIZE >= TILE_SIZE - TILE_BORDER ||
822 y % TILE_SIZE >= TILE_SIZE - TILE_BORDER)
824 } else if (button == CURSOR_UP || button == CURSOR_DOWN ||
825 button == CURSOR_RIGHT || button == CURSOR_LEFT) {
826 if (button == CURSOR_UP && ui->cur_y > 0)
828 else if (button == CURSOR_DOWN && ui->cur_y < state->height-1)
830 else if (button == CURSOR_LEFT && ui->cur_x > 0)
832 else if (button == CURSOR_RIGHT && ui->cur_x < state->width-1)
835 return nullret; /* no cursor movement */
836 ui->cur_visible = TRUE;
837 return state; /* UI activity has occurred */
838 } else if (button == 'a' || button == 's' || button == 'd' ||
839 button == 'A' || button == 'S' || button == 'D') {
842 if (button == 'a' || button == 'A')
843 button = LEFT_BUTTON;
844 else if (button == 's' || button == 'S')
845 button = MIDDLE_BUTTON;
846 else if (button == 'd' || button == 'D')
847 button = RIGHT_BUTTON;
848 ui->cur_visible = TRUE;
849 } else if (button == 'j' || button == 'J') {
850 /* XXX should we have some mouse control for this? */
851 button = 'J'; /* canonify */
852 tx = ty = -1; /* shut gcc up :( */
857 * The middle button locks or unlocks a tile. (A locked tile
858 * cannot be turned, and is visually marked as being locked.
859 * This is a convenience for the player, so that once they are
860 * sure which way round a tile goes, they can lock it and thus
861 * avoid forgetting later on that they'd already done that one;
862 * and the locking also prevents them turning the tile by
863 * accident. If they change their mind, another middle click
866 if (button == MIDDLE_BUTTON) {
868 ret = dup_game(state);
869 tile(ret, tx, ty) ^= LOCKED;
870 ret->last_rotate_dir = 0;
873 } else if (button == LEFT_BUTTON || button == RIGHT_BUTTON) {
876 * The left and right buttons have no effect if clicked on a
879 if (tile(state, tx, ty) & LOCKED)
883 * Otherwise, turn the tile one way or the other. Left button
884 * turns anticlockwise; right button turns clockwise.
886 ret = dup_game(state);
887 orig = tile(ret, tx, ty);
888 if (button == LEFT_BUTTON) {
889 tile(ret, tx, ty) = A(orig);
890 ret->last_rotate_dir = +1;
892 tile(ret, tx, ty) = C(orig);
893 ret->last_rotate_dir = -1;
896 } else if (button == 'J') {
899 * Jumble all unlocked tiles to random orientations.
902 ret = dup_game(state);
903 for (jy = 0; jy < ret->height; jy++) {
904 for (jx = 0; jx < ret->width; jx++) {
905 if (!(tile(ret, jx, jy) & LOCKED)) {
906 int rot = random_upto(ui->rs, 4);
907 orig = tile(ret, jx, jy);
908 tile(ret, jx, jy) = ROT(orig, rot);
912 ret->last_rotate_dir = 0; /* suppress animation */
917 * Check whether the game has been completed.
920 unsigned char *active = compute_active(ret);
924 for (x1 = 0; x1 < ret->width; x1++)
925 for (y1 = 0; y1 < ret->height; y1++)
926 if (!index(ret, active, x1, y1)) {
928 goto break_label; /* break out of two loops at once */
935 ret->completed = TRUE;
941 /* ----------------------------------------------------------------------
942 * Routines for drawing the game position on the screen.
945 struct game_drawstate {
948 unsigned char *visible;
951 static game_drawstate *game_new_drawstate(game_state *state)
953 game_drawstate *ds = snew(game_drawstate);
956 ds->width = state->width;
957 ds->height = state->height;
958 ds->visible = snewn(state->width * state->height, unsigned char);
959 memset(ds->visible, 0xFF, state->width * state->height);
964 static void game_free_drawstate(game_drawstate *ds)
970 static void game_size(game_params *params, int *x, int *y)
972 *x = WINDOW_OFFSET * 2 + TILE_SIZE * params->width + TILE_BORDER;
973 *y = WINDOW_OFFSET * 2 + TILE_SIZE * params->height + TILE_BORDER;
976 static float *game_colours(frontend *fe, game_state *state, int *ncolours)
980 ret = snewn(NCOLOURS * 3, float);
981 *ncolours = NCOLOURS;
984 * Basic background colour is whatever the front end thinks is
985 * a sensible default.
987 frontend_default_colour(fe, &ret[COL_BACKGROUND * 3]);
992 ret[COL_WIRE * 3 + 0] = 0.0F;
993 ret[COL_WIRE * 3 + 1] = 0.0F;
994 ret[COL_WIRE * 3 + 2] = 0.0F;
997 * Powered wires and powered endpoints are cyan.
999 ret[COL_POWERED * 3 + 0] = 0.0F;
1000 ret[COL_POWERED * 3 + 1] = 1.0F;
1001 ret[COL_POWERED * 3 + 2] = 1.0F;
1006 ret[COL_BARRIER * 3 + 0] = 1.0F;
1007 ret[COL_BARRIER * 3 + 1] = 0.0F;
1008 ret[COL_BARRIER * 3 + 2] = 0.0F;
1011 * Unpowered endpoints are blue.
1013 ret[COL_ENDPOINT * 3 + 0] = 0.0F;
1014 ret[COL_ENDPOINT * 3 + 1] = 0.0F;
1015 ret[COL_ENDPOINT * 3 + 2] = 1.0F;
1018 * Tile borders are a darker grey than the background.
1020 ret[COL_BORDER * 3 + 0] = 0.5F * ret[COL_BACKGROUND * 3 + 0];
1021 ret[COL_BORDER * 3 + 1] = 0.5F * ret[COL_BACKGROUND * 3 + 1];
1022 ret[COL_BORDER * 3 + 2] = 0.5F * ret[COL_BACKGROUND * 3 + 2];
1025 * Locked tiles are a grey in between those two.
1027 ret[COL_LOCKED * 3 + 0] = 0.75F * ret[COL_BACKGROUND * 3 + 0];
1028 ret[COL_LOCKED * 3 + 1] = 0.75F * ret[COL_BACKGROUND * 3 + 1];
1029 ret[COL_LOCKED * 3 + 2] = 0.75F * ret[COL_BACKGROUND * 3 + 2];
1034 static void draw_thick_line(frontend *fe, int x1, int y1, int x2, int y2,
1037 draw_line(fe, x1-1, y1, x2-1, y2, COL_WIRE);
1038 draw_line(fe, x1+1, y1, x2+1, y2, COL_WIRE);
1039 draw_line(fe, x1, y1-1, x2, y2-1, COL_WIRE);
1040 draw_line(fe, x1, y1+1, x2, y2+1, COL_WIRE);
1041 draw_line(fe, x1, y1, x2, y2, colour);
1044 static void draw_rect_coords(frontend *fe, int x1, int y1, int x2, int y2,
1047 int mx = (x1 < x2 ? x1 : x2);
1048 int my = (y1 < y2 ? y1 : y2);
1049 int dx = (x2 + x1 - 2*mx + 1);
1050 int dy = (y2 + y1 - 2*my + 1);
1052 draw_rect(fe, mx, my, dx, dy, colour);
1055 static void draw_barrier_corner(frontend *fe, int x, int y, int dir, int phase)
1057 int bx = WINDOW_OFFSET + TILE_SIZE * x;
1058 int by = WINDOW_OFFSET + TILE_SIZE * y;
1059 int x1, y1, dx, dy, dir2;
1064 dx = X(dir) + X(dir2);
1065 dy = Y(dir) + Y(dir2);
1066 x1 = (dx > 0 ? TILE_SIZE+TILE_BORDER-1 : 0);
1067 y1 = (dy > 0 ? TILE_SIZE+TILE_BORDER-1 : 0);
1070 draw_rect_coords(fe, bx+x1, by+y1,
1071 bx+x1-TILE_BORDER*dx, by+y1-(TILE_BORDER-1)*dy,
1073 draw_rect_coords(fe, bx+x1, by+y1,
1074 bx+x1-(TILE_BORDER-1)*dx, by+y1-TILE_BORDER*dy,
1077 draw_rect_coords(fe, bx+x1, by+y1,
1078 bx+x1-(TILE_BORDER-1)*dx, by+y1-(TILE_BORDER-1)*dy,
1083 static void draw_barrier(frontend *fe, int x, int y, int dir, int phase)
1085 int bx = WINDOW_OFFSET + TILE_SIZE * x;
1086 int by = WINDOW_OFFSET + TILE_SIZE * y;
1089 x1 = (X(dir) > 0 ? TILE_SIZE : X(dir) == 0 ? TILE_BORDER : 0);
1090 y1 = (Y(dir) > 0 ? TILE_SIZE : Y(dir) == 0 ? TILE_BORDER : 0);
1091 w = (X(dir) ? TILE_BORDER : TILE_SIZE - TILE_BORDER);
1092 h = (Y(dir) ? TILE_BORDER : TILE_SIZE - TILE_BORDER);
1095 draw_rect(fe, bx+x1-X(dir), by+y1-Y(dir), w, h, COL_WIRE);
1097 draw_rect(fe, bx+x1, by+y1, w, h, COL_BARRIER);
1101 static void draw_tile(frontend *fe, game_state *state, int x, int y, int tile,
1102 float angle, int cursor)
1104 int bx = WINDOW_OFFSET + TILE_SIZE * x;
1105 int by = WINDOW_OFFSET + TILE_SIZE * y;
1107 float cx, cy, ex, ey, tx, ty;
1108 int dir, col, phase;
1111 * When we draw a single tile, we must draw everything up to
1112 * and including the borders around the tile. This means that
1113 * if the neighbouring tiles have connections to those borders,
1114 * we must draw those connections on the borders themselves.
1116 * This would be terribly fiddly if we ever had to draw a tile
1117 * while its neighbour was in mid-rotate, because we'd have to
1118 * arrange to _know_ that the neighbour was being rotated and
1119 * hence had an anomalous effect on the redraw of this tile.
1120 * Fortunately, the drawing algorithm avoids ever calling us in
1121 * this circumstance: we're either drawing lots of straight
1122 * tiles at game start or after a move is complete, or we're
1123 * repeatedly drawing only the rotating tile. So no problem.
1127 * So. First blank the tile out completely: draw a big
1128 * rectangle in border colour, and a smaller rectangle in
1129 * background colour to fill it in.
1131 draw_rect(fe, bx, by, TILE_SIZE+TILE_BORDER, TILE_SIZE+TILE_BORDER,
1133 draw_rect(fe, bx+TILE_BORDER, by+TILE_BORDER,
1134 TILE_SIZE-TILE_BORDER, TILE_SIZE-TILE_BORDER,
1135 tile & LOCKED ? COL_LOCKED : COL_BACKGROUND);
1138 * Draw an inset outline rectangle as a cursor, in whichever of
1139 * COL_LOCKED and COL_BACKGROUND we aren't currently drawing
1143 draw_line(fe, bx+TILE_SIZE/8, by+TILE_SIZE/8,
1144 bx+TILE_SIZE/8, by+TILE_SIZE-TILE_SIZE/8,
1145 tile & LOCKED ? COL_BACKGROUND : COL_LOCKED);
1146 draw_line(fe, bx+TILE_SIZE/8, by+TILE_SIZE/8,
1147 bx+TILE_SIZE-TILE_SIZE/8, by+TILE_SIZE/8,
1148 tile & LOCKED ? COL_BACKGROUND : COL_LOCKED);
1149 draw_line(fe, bx+TILE_SIZE-TILE_SIZE/8, by+TILE_SIZE/8,
1150 bx+TILE_SIZE-TILE_SIZE/8, by+TILE_SIZE-TILE_SIZE/8,
1151 tile & LOCKED ? COL_BACKGROUND : COL_LOCKED);
1152 draw_line(fe, bx+TILE_SIZE/8, by+TILE_SIZE-TILE_SIZE/8,
1153 bx+TILE_SIZE-TILE_SIZE/8, by+TILE_SIZE-TILE_SIZE/8,
1154 tile & LOCKED ? COL_BACKGROUND : COL_LOCKED);
1158 * Set up the rotation matrix.
1160 matrix[0] = (float)cos(angle * PI / 180.0);
1161 matrix[1] = (float)-sin(angle * PI / 180.0);
1162 matrix[2] = (float)sin(angle * PI / 180.0);
1163 matrix[3] = (float)cos(angle * PI / 180.0);
1168 cx = cy = TILE_BORDER + (TILE_SIZE-TILE_BORDER) / 2.0F - 0.5F;
1169 col = (tile & ACTIVE ? COL_POWERED : COL_WIRE);
1170 for (dir = 1; dir < 0x10; dir <<= 1) {
1172 ex = (TILE_SIZE - TILE_BORDER - 1.0F) / 2.0F * X(dir);
1173 ey = (TILE_SIZE - TILE_BORDER - 1.0F) / 2.0F * Y(dir);
1174 MATMUL(tx, ty, matrix, ex, ey);
1175 draw_thick_line(fe, bx+(int)cx, by+(int)cy,
1176 bx+(int)(cx+tx), by+(int)(cy+ty),
1180 for (dir = 1; dir < 0x10; dir <<= 1) {
1182 ex = (TILE_SIZE - TILE_BORDER - 1.0F) / 2.0F * X(dir);
1183 ey = (TILE_SIZE - TILE_BORDER - 1.0F) / 2.0F * Y(dir);
1184 MATMUL(tx, ty, matrix, ex, ey);
1185 draw_line(fe, bx+(int)cx, by+(int)cy,
1186 bx+(int)(cx+tx), by+(int)(cy+ty), col);
1191 * Draw the box in the middle. We do this in blue if the tile
1192 * is an unpowered endpoint, in cyan if the tile is a powered
1193 * endpoint, in black if the tile is the centrepiece, and
1194 * otherwise not at all.
1197 if (x == state->cx && y == state->cy)
1199 else if (COUNT(tile) == 1) {
1200 col = (tile & ACTIVE ? COL_POWERED : COL_ENDPOINT);
1205 points[0] = +1; points[1] = +1;
1206 points[2] = +1; points[3] = -1;
1207 points[4] = -1; points[5] = -1;
1208 points[6] = -1; points[7] = +1;
1210 for (i = 0; i < 8; i += 2) {
1211 ex = (TILE_SIZE * 0.24F) * points[i];
1212 ey = (TILE_SIZE * 0.24F) * points[i+1];
1213 MATMUL(tx, ty, matrix, ex, ey);
1214 points[i] = bx+(int)(cx+tx);
1215 points[i+1] = by+(int)(cy+ty);
1218 draw_polygon(fe, points, 4, TRUE, col);
1219 draw_polygon(fe, points, 4, FALSE, COL_WIRE);
1223 * Draw the points on the border if other tiles are connected
1226 for (dir = 1; dir < 0x10; dir <<= 1) {
1227 int dx, dy, px, py, lx, ly, vx, vy, ox, oy;
1235 if (ox < 0 || ox >= state->width || oy < 0 || oy >= state->height)
1238 if (!(tile(state, ox, oy) & F(dir)))
1241 px = bx + (int)(dx>0 ? TILE_SIZE + TILE_BORDER - 1 : dx<0 ? 0 : cx);
1242 py = by + (int)(dy>0 ? TILE_SIZE + TILE_BORDER - 1 : dy<0 ? 0 : cy);
1243 lx = dx * (TILE_BORDER-1);
1244 ly = dy * (TILE_BORDER-1);
1248 if (angle == 0.0 && (tile & dir)) {
1250 * If we are fully connected to the other tile, we must
1251 * draw right across the tile border. (We can use our
1252 * own ACTIVE state to determine what colour to do this
1253 * in: if we are fully connected to the other tile then
1254 * the two ACTIVE states will be the same.)
1256 draw_rect_coords(fe, px-vx, py-vy, px+lx+vx, py+ly+vy, COL_WIRE);
1257 draw_rect_coords(fe, px, py, px+lx, py+ly,
1258 (tile & ACTIVE) ? COL_POWERED : COL_WIRE);
1261 * The other tile extends into our border, but isn't
1262 * actually connected to us. Just draw a single black
1265 draw_rect_coords(fe, px, py, px, py, COL_WIRE);
1270 * Draw barrier corners, and then barriers.
1272 for (phase = 0; phase < 2; phase++) {
1273 for (dir = 1; dir < 0x10; dir <<= 1)
1274 if (barrier(state, x, y) & (dir << 4))
1275 draw_barrier_corner(fe, x, y, dir << 4, phase);
1276 for (dir = 1; dir < 0x10; dir <<= 1)
1277 if (barrier(state, x, y) & dir)
1278 draw_barrier(fe, x, y, dir, phase);
1281 draw_update(fe, bx, by, TILE_SIZE+TILE_BORDER, TILE_SIZE+TILE_BORDER);
1284 static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate,
1285 game_state *state, int dir, game_ui *ui, float t, float ft)
1287 int x, y, tx, ty, frame, last_rotate_dir;
1288 unsigned char *active;
1292 * Clear the screen and draw the exterior barrier lines if this
1293 * is our first call.
1301 WINDOW_OFFSET * 2 + TILE_SIZE * state->width + TILE_BORDER,
1302 WINDOW_OFFSET * 2 + TILE_SIZE * state->height + TILE_BORDER,
1304 draw_update(fe, 0, 0,
1305 WINDOW_OFFSET*2 + TILE_SIZE*state->width + TILE_BORDER,
1306 WINDOW_OFFSET*2 + TILE_SIZE*state->height + TILE_BORDER);
1308 for (phase = 0; phase < 2; phase++) {
1310 for (x = 0; x < ds->width; x++) {
1311 if (barrier(state, x, 0) & UL)
1312 draw_barrier_corner(fe, x, -1, LD, phase);
1313 if (barrier(state, x, 0) & RU)
1314 draw_barrier_corner(fe, x, -1, DR, phase);
1315 if (barrier(state, x, 0) & U)
1316 draw_barrier(fe, x, -1, D, phase);
1317 if (barrier(state, x, ds->height-1) & DR)
1318 draw_barrier_corner(fe, x, ds->height, RU, phase);
1319 if (barrier(state, x, ds->height-1) & LD)
1320 draw_barrier_corner(fe, x, ds->height, UL, phase);
1321 if (barrier(state, x, ds->height-1) & D)
1322 draw_barrier(fe, x, ds->height, U, phase);
1325 for (y = 0; y < ds->height; y++) {
1326 if (barrier(state, 0, y) & UL)
1327 draw_barrier_corner(fe, -1, y, RU, phase);
1328 if (barrier(state, 0, y) & LD)
1329 draw_barrier_corner(fe, -1, y, DR, phase);
1330 if (barrier(state, 0, y) & L)
1331 draw_barrier(fe, -1, y, R, phase);
1332 if (barrier(state, ds->width-1, y) & RU)
1333 draw_barrier_corner(fe, ds->width, y, UL, phase);
1334 if (barrier(state, ds->width-1, y) & DR)
1335 draw_barrier_corner(fe, ds->width, y, LD, phase);
1336 if (barrier(state, ds->width-1, y) & R)
1337 draw_barrier(fe, ds->width, y, L, phase);
1343 last_rotate_dir = dir==-1 ? oldstate->last_rotate_dir :
1344 state->last_rotate_dir;
1345 if (oldstate && (t < ROTATE_TIME) && last_rotate_dir) {
1347 * We're animating a single tile rotation. Find the turning tile,
1350 for (x = 0; x < oldstate->width; x++)
1351 for (y = 0; y < oldstate->height; y++)
1352 if ((tile(oldstate, x, y) ^ tile(state, x, y)) & 0xF) {
1354 goto break_label; /* leave both loops at once */
1359 angle = last_rotate_dir * dir * 90.0F * (t / ROTATE_TIME);
1367 * We're animating a completion flash. Find which frame
1370 frame = (int)(ft / FLASH_FRAME);
1374 * Draw any tile which differs from the way it was last drawn.
1376 active = compute_active(state);
1378 for (x = 0; x < ds->width; x++)
1379 for (y = 0; y < ds->height; y++) {
1380 unsigned char c = tile(state, x, y) | index(state, active, x, y);
1383 * In a completion flash, we adjust the LOCKED bit
1384 * depending on our distance from the centre point and
1388 int xdist, ydist, dist;
1389 xdist = (x < state->cx ? state->cx - x : x - state->cx);
1390 ydist = (y < state->cy ? state->cy - y : y - state->cy);
1391 dist = (xdist > ydist ? xdist : ydist);
1393 if (frame >= dist && frame < dist+4) {
1394 int lock = (frame - dist) & 1;
1395 lock = lock ? LOCKED : 0;
1396 c = (c &~ LOCKED) | lock;
1400 if (index(state, ds->visible, x, y) != c ||
1401 index(state, ds->visible, x, y) == 0xFF ||
1402 (x == tx && y == ty) ||
1403 (ui->cur_visible && x == ui->cur_x && y == ui->cur_y)) {
1404 draw_tile(fe, state, x, y, c,
1405 (x == tx && y == ty ? angle : 0.0F),
1406 (ui->cur_visible && x == ui->cur_x && y == ui->cur_y));
1407 if ((x == tx && y == ty) ||
1408 (ui->cur_visible && x == ui->cur_x && y == ui->cur_y))
1409 index(state, ds->visible, x, y) = 0xFF;
1411 index(state, ds->visible, x, y) = c;
1416 * Update the status bar.
1419 char statusbuf[256];
1422 n = state->width * state->height;
1423 for (i = a = 0; i < n; i++)
1427 sprintf(statusbuf, "%sActive: %d/%d",
1428 (state->completed ? "COMPLETED! " : ""), a, n);
1430 status_bar(fe, statusbuf);
1436 static float game_anim_length(game_state *oldstate,
1437 game_state *newstate, int dir)
1439 int x, y, last_rotate_dir;
1442 * Don't animate if last_rotate_dir is zero.
1444 last_rotate_dir = dir==-1 ? oldstate->last_rotate_dir :
1445 newstate->last_rotate_dir;
1446 if (last_rotate_dir) {
1449 * If there's a tile which has been rotated, allow time to
1450 * animate its rotation.
1452 for (x = 0; x < oldstate->width; x++)
1453 for (y = 0; y < oldstate->height; y++)
1454 if ((tile(oldstate, x, y) ^ tile(newstate, x, y)) & 0xF) {
1463 static float game_flash_length(game_state *oldstate,
1464 game_state *newstate, int dir)
1467 * If the game has just been completed, we display a completion
1470 if (!oldstate->completed && newstate->completed) {
1473 if (size < newstate->cx+1)
1474 size = newstate->cx+1;
1475 if (size < newstate->cy+1)
1476 size = newstate->cy+1;
1477 if (size < newstate->width - newstate->cx)
1478 size = newstate->width - newstate->cx;
1479 if (size < newstate->height - newstate->cy)
1480 size = newstate->height - newstate->cy;
1481 return FLASH_FRAME * (size+4);
1487 static int game_wants_statusbar(void)
1496 const struct game thegame = {
1497 "Net", "games.net", TRUE,
1518 game_free_drawstate,
1522 game_wants_statusbar,