X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?a=blobdiff_plain;f=net.c;h=349b13dfb216edfde678f50cf8d701c4ead2e91e;hb=3ce69e84cad15844282d691fa03e711c5353c05e;hp=5037c9b2ec83df3e41af839123d52f4d22ee25c7;hpb=0066cdd62aea5bde96903682e7fbdadfd5fd08d9;p=sgt-puzzles.git diff --git a/net.c b/net.c index 5037c9b..349b13d 100644 --- a/net.c +++ b/net.c @@ -12,7 +12,20 @@ #include "puzzles.h" #include "tree234.h" -#define PI 3.141592653589793238462643383279502884197169399 +/* + * The standard user interface for Net simply has left- and + * right-button mouse clicks in a square rotate it one way or the + * other. We also provide, by #ifdef, a separate interface based on + * rotational dragging motions. I initially developed this for the + * Mac on the basis that it might work better than the click + * interface with only one mouse button available, but in fact + * found it to be quite strange and unintuitive. Apparently it + * works better on stylus-driven platforms such as Palm and + * PocketPC, though, so we enable it by default there. + */ +#ifdef STYLUS_BASED +#define USE_DRAGGING +#endif #define MATMUL(xr,yr,m,x,y) do { \ float rx, ry, xx = (x), yy = (y), *mat = (m); \ @@ -28,11 +41,11 @@ #define D 0x08 #define LOCKED 0x10 #define ACTIVE 0x20 -/* Corner flags go in the barriers array */ -#define RU 0x10 -#define UL 0x20 -#define LD 0x40 -#define DR 0x80 +#define RLOOP (R << 6) +#define ULOOP (U << 6) +#define LLOOP (L << 6) +#define DLOOP (D << 6) +#define LOOP(dir) ((dir) << 6) /* Rotations: Anticlockwise, Clockwise, Flip, general rotate */ #define A(x) ( (((x) & 0x07) << 1) | (((x) & 0x08) >> 3) ) @@ -50,13 +63,25 @@ #define COUNT(x) ( (((x) & 0x08) >> 3) + (((x) & 0x04) >> 2) + \ (((x) & 0x02) >> 1) + ((x) & 0x01) ) -#define TILE_SIZE 32 +#define PREFERRED_TILE_SIZE 32 +#define TILE_SIZE (ds->tilesize) #define TILE_BORDER 1 +#ifdef SMALL_SCREEN +#define WINDOW_OFFSET 4 +#else #define WINDOW_OFFSET 16 +#endif #define ROTATE_TIME 0.13F #define FLASH_FRAME 0.07F +/* Transform physical coords to game coords using game_drawstate ds */ +#define GX(x) (((x) + ds->org_x) % ds->width) +#define GY(y) (((y) + ds->org_y) % ds->height) +/* ...and game coords to physical coords */ +#define RX(x) (((x) + ds->width - ds->org_x) % ds->width) +#define RY(y) (((y) + ds->height - ds->org_y) % ds->height) + enum { COL_BACKGROUND, COL_LOCKED, @@ -65,6 +90,7 @@ enum { COL_ENDPOINT, COL_POWERED, COL_BARRIER, + COL_LOOP, NCOLOURS }; @@ -76,15 +102,10 @@ struct game_params { float barrier_probability; }; -struct game_aux_info { - int width, height; - unsigned char *tiles; -}; - struct game_state { - int width, height, cx, cy, wrapping, completed; + int width, height, wrapping, completed; int last_rotate_x, last_rotate_y, last_rotate_dir; - int used_solve, just_used_solve; + int used_solve; unsigned char *tiles; unsigned char *barriers; }; @@ -120,7 +141,7 @@ static int xyd_cmp(const void *av, const void *bv) { if (a->direction > b->direction) return +1; return 0; -}; +} static int xyd_cmp_nc(void *av, void *bv) { return xyd_cmp(av, bv); } @@ -149,32 +170,33 @@ static game_params *default_params(void) return ret; } +static const struct game_params net_presets[] = { + {5, 5, FALSE, TRUE, 0.0}, + {7, 7, FALSE, TRUE, 0.0}, + {9, 9, FALSE, TRUE, 0.0}, + {11, 11, FALSE, TRUE, 0.0}, +#ifndef SMALL_SCREEN + {13, 11, FALSE, TRUE, 0.0}, +#endif + {5, 5, TRUE, TRUE, 0.0}, + {7, 7, TRUE, TRUE, 0.0}, + {9, 9, TRUE, TRUE, 0.0}, + {11, 11, TRUE, TRUE, 0.0}, +#ifndef SMALL_SCREEN + {13, 11, TRUE, TRUE, 0.0}, +#endif +}; + static int game_fetch_preset(int i, char **name, game_params **params) { game_params *ret; char str[80]; - static const struct { int x, y, wrap; } values[] = { - {5, 5, FALSE}, - {7, 7, FALSE}, - {9, 9, FALSE}, - {11, 11, FALSE}, - {13, 11, FALSE}, - {5, 5, TRUE}, - {7, 7, TRUE}, - {9, 9, TRUE}, - {11, 11, TRUE}, - {13, 11, TRUE}, - }; - - if (i < 0 || i >= lenof(values)) + + if (i < 0 || i >= lenof(net_presets)) return FALSE; ret = snew(game_params); - ret->width = values[i].x; - ret->height = values[i].y; - ret->wrapping = values[i].wrap; - ret->unique = TRUE; - ret->barrier_probability = 0.0; + *ret = net_presets[i]; sprintf(str, "%dx%d%s", ret->width, ret->height, ret->wrapping ? " wrapping" : ""); @@ -189,7 +211,7 @@ static void free_params(game_params *params) sfree(params); } -static game_params *dup_params(game_params *params) +static game_params *dup_params(const game_params *params) { game_params *ret = snew(game_params); *ret = *params; /* structure copy */ @@ -216,7 +238,7 @@ static void decode_params(game_params *ret, char const *string) ret->wrapping = TRUE; } else if (*p == 'b') { p++; - ret->barrier_probability = atof(p); + ret->barrier_probability = (float)atof(p); while (*p && (*p == '.' || isdigit((unsigned char)*p))) p++; } else if (*p == 'a') { p++; @@ -226,7 +248,7 @@ static void decode_params(game_params *ret, char const *string) } } -static char *encode_params(game_params *params, int full) +static char *encode_params(const game_params *params, int full) { char ret[400]; int len; @@ -244,7 +266,7 @@ static char *encode_params(game_params *params, int full) return dupstr(ret); } -static config_item *game_configure(game_params *params) +static config_item *game_configure(const game_params *params) { config_item *ret; char buf[80]; @@ -287,7 +309,7 @@ static config_item *game_configure(game_params *params) return ret; } -static game_params *custom_params(config_item *cfg) +static game_params *custom_params(const config_item *cfg) { game_params *ret = snew(game_params); @@ -300,20 +322,65 @@ static game_params *custom_params(config_item *cfg) return ret; } -static char *validate_params(game_params *params) +static char *validate_params(const game_params *params, int full) { - if (params->width <= 0 && params->height <= 0) + if (params->width <= 0 || params->height <= 0) return "Width and height must both be greater than zero"; - if (params->width <= 0) - return "Width must be greater than zero"; - if (params->height <= 0) - return "Height must be greater than zero"; if (params->width <= 1 && params->height <= 1) return "At least one of width and height must be greater than one"; if (params->barrier_probability < 0) return "Barrier probability may not be negative"; if (params->barrier_probability > 1) return "Barrier probability may not be greater than 1"; + + /* + * Specifying either grid dimension as 2 in a wrapping puzzle + * makes it actually impossible to ensure a unique puzzle + * solution. + * + * Proof: + * + * Without loss of generality, let us assume the puzzle _width_ + * is 2, so we can conveniently discuss rows without having to + * say `rows/columns' all the time. (The height may be 2 as + * well, but that doesn't matter.) + * + * In each row, there are two edges between tiles: the inner + * edge (running down the centre of the grid) and the outer + * edge (the identified left and right edges of the grid). + * + * Lemma: In any valid 2xn puzzle there must be at least one + * row in which _exactly one_ of the inner edge and outer edge + * is connected. + * + * Proof: No row can have _both_ inner and outer edges + * connected, because this would yield a loop. So the only + * other way to falsify the lemma is for every row to have + * _neither_ the inner nor outer edge connected. But this + * means there is no connection at all between the left and + * right columns of the puzzle, so there are two disjoint + * subgraphs, which is also disallowed. [] + * + * Given such a row, it is always possible to make the + * disconnected edge connected and the connected edge + * disconnected without changing the state of any other edge. + * (This is easily seen by case analysis on the various tiles: + * left-pointing and right-pointing endpoints can be exchanged, + * likewise T-pieces, and a corner piece can select its + * horizontal connectivity independently of its vertical.) This + * yields a distinct valid solution. + * + * Thus, for _every_ row in which exactly one of the inner and + * outer edge is connected, there are two valid states for that + * row, and hence the total number of solutions of the puzzle + * is at least 2^(number of such rows), and in particular is at + * least 2 since there must be at least one such row. [] + */ + if (full && params->unique && params->wrapping && + (params->width == 2 || params->height == 2)) + return "No wrapping puzzle with a width or height of 2 can have" + " a unique solution"; + return NULL; } @@ -344,29 +411,6 @@ static char *validate_params(game_params *params) * avoidance is required. */ -static int dsf_canonify(int *dsf, int val) -{ - int v2 = val; - - while (dsf[val] != val) - val = dsf[val]; - - while (v2 != val) { - int tmp = dsf[v2]; - dsf[v2] = val; - v2 = tmp; - } - - return val; -} - -static void dsf_merge(int *dsf, int v1, int v2) -{ - v1 = dsf_canonify(dsf, v1); - v2 = dsf_canonify(dsf, v2); - dsf[v2] = v1; -} - struct todo { unsigned char *marked; int *buffer; @@ -506,9 +550,7 @@ static int net_solver(int w, int h, unsigned char *tiles, * classes) by finding the representative of each tile and * setting equivalence[one]=the_other. */ - equivalence = snewn(w * h, int); - for (i = 0; i < w*h; i++) - equivalence[i] = i; /* initially all distinct */ + equivalence = snew_dsf(w * h); /* * On a non-wrapping grid, we instantly know that all the edges @@ -694,7 +736,6 @@ static int net_solver(int w, int h, unsigned char *tiles, assert(j > 0); /* we can't lose _all_ possibilities! */ if (j < i) { - int a, o; done_something = TRUE; /* @@ -703,12 +744,16 @@ static int net_solver(int w, int h, unsigned char *tiles, */ while (j < 4) tilestate[(y*w+x) * 4 + j++] = 255; + } - /* - * Now go through them again and see if we've - * deduced anything new about any edges. - */ + /* + * Now go through the tile orientations again and see + * if we've deduced anything new about any edges. + */ + { + int a, o; a = 0xF; o = 0; + for (i = 0; i < 4 && tilestate[(y*w+x) * 4 + i] != 255; i++) { a &= tilestate[(y*w+x) * 4 + i]; o |= tilestate[(y*w+x) * 4 + i]; @@ -879,14 +924,7 @@ static void perturb(int w, int h, unsigned char *tiles, int wrapping, perim2 = snewn(nperim, struct xyd); memcpy(perim2, perimeter, nperim * sizeof(struct xyd)); /* Shuffle the perimeter, so as to search it without directional bias. */ - for (i = nperim; --i ;) { - int j = random_upto(rs, i+1); - struct xyd t; - - t = perim2[j]; - perim2[j] = perim2[i]; - perim2[i] = t; - } + shuffle(perim2, nperim, sizeof(*perim2), rs); for (i = 0; i < nperim; i++) { int x2, y2; @@ -916,9 +954,12 @@ static void perturb(int w, int h, unsigned char *tiles, int wrapping, break; } + sfree(perim2); - if (i == nperim) + if (i == nperim) { + sfree(perimeter); return; /* nothing we can do! */ + } /* * Now we've constructed a new link, we need to find the entire @@ -1091,8 +1132,12 @@ static void perturb(int w, int h, unsigned char *tiles, int wrapping, sfree(perimeter); } -static char *new_game_desc(game_params *params, random_state *rs, - game_aux_info **aux) +static int *compute_loops_inner(int w, int h, int wrapping, + const unsigned char *tiles, + const unsigned char *barriers); + +static char *new_game_desc(const game_params *params, random_state *rs, + char **aux, int interactive) { tree234 *possibilities, *barriertree; int w, h, x, y, cx, cy, nbarriers; @@ -1183,7 +1228,7 @@ static char *new_game_desc(game_params *params, random_state *rs, OFFSET(x2, y2, x1, y1, d1, params); d2 = F(d1); -#ifdef DEBUG +#ifdef GENERATION_DIAGNOSTICS printf("picked (%d,%d,%c) <-> (%d,%d,%c)\n", x1, y1, "0RU3L567D9abcdef"[d1], x2, y2, "0RU3L567D9abcdef"[d2]); #endif @@ -1210,7 +1255,7 @@ static char *new_game_desc(game_params *params, random_state *rs, xydp = find234(possibilities, &xyd1, NULL); if (xydp) { -#ifdef DEBUG +#ifdef GENERATION_DIAGNOSTICS printf("T-piece; removing (%d,%d,%c)\n", xydp->x, xydp->y, "0RU3L567D9abcdef"[xydp->direction]); #endif @@ -1237,7 +1282,7 @@ static char *new_game_desc(game_params *params, random_state *rs, xydp = find234(possibilities, &xyd1, NULL); if (xydp) { -#ifdef DEBUG +#ifdef GENERATION_DIAGNOSTICS printf("Loop avoidance; removing (%d,%d,%c)\n", xydp->x, xydp->y, "0RU3L567D9abcdef"[xydp->direction]); #endif @@ -1272,7 +1317,7 @@ static char *new_game_desc(game_params *params, random_state *rs, if (index(params, tiles, x3, y3)) continue; /* this would create a loop */ -#ifdef DEBUG +#ifdef GENERATION_DIAGNOSTICS printf("New frontier; adding (%d,%d,%c)\n", x2, y2, "0RU3L567D9abcdef"[d]); #endif @@ -1354,29 +1399,114 @@ static char *new_game_desc(game_params *params, random_state *rs, } /* - * Save the unshuffled grid in an aux_info. + * Save the unshuffled grid in aux. */ { - game_aux_info *solution; + char *solution; + int i; - solution = snew(game_aux_info); - solution->width = w; - solution->height = h; - solution->tiles = snewn(w * h, unsigned char); - memcpy(solution->tiles, tiles, w * h); + solution = snewn(w * h + 1, char); + for (i = 0; i < w * h; i++) + solution[i] = "0123456789abcdef"[tiles[i] & 0xF]; + solution[w*h] = '\0'; *aux = solution; } /* * Now shuffle the grid. + * + * In order to avoid accidentally generating an already-solved + * grid, we will reshuffle as necessary to ensure that at least + * one edge has a mismatched connection. + * + * This can always be done, since validate_params() enforces a + * grid area of at least 2 and our generator never creates + * either type of rotationally invariant tile (cross and + * blank). Hence there must be at least one edge separating + * distinct tiles, and it must be possible to find orientations + * of those tiles such that one tile is trying to connect + * through that edge and the other is not. + * + * (We could be more subtle, and allow the shuffle to generate + * a grid in which all tiles match up locally and the only + * criterion preventing the grid from being already solved is + * connectedness. However, that would take more effort, and + * it's easier to simply make sure every grid is _obviously_ + * not solved.) + * + * We also require that our shuffle produces no loops in the + * initial grid state, because it's a bit rude to light up a 'HEY, + * YOU DID SOMETHING WRONG!' indicator when the user hasn't even + * had a chance to do _anything_ yet. This also is possible just + * by retrying the whole shuffle on failure, because it's clear + * that at least one non-solved shuffle with no loops must exist. + * (Proof: take the _solved_ state of the puzzle, and rotate one + * endpoint.) */ - for (y = 0; y < h; y++) { - for (x = 0; x < w; x++) { - int orig = index(params, tiles, x, y); - int rot = random_upto(rs, 4); - index(params, tiles, x, y) = ROT(orig, rot); - } + while (1) { + int mismatches, prev_loopsquares, this_loopsquares, i; + int *loops; + + shuffle: + for (y = 0; y < h; y++) { + for (x = 0; x < w; x++) { + int orig = index(params, tiles, x, y); + int rot = random_upto(rs, 4); + index(params, tiles, x, y) = ROT(orig, rot); + } + } + + /* + * Check for loops, and try to fix them by reshuffling just + * the squares involved. + */ + prev_loopsquares = w*h+1; + while (1) { + loops = compute_loops_inner(w, h, params->wrapping, tiles, NULL); + this_loopsquares = 0; + for (i = 0; i < w*h; i++) { + if (loops[i]) { + int orig = tiles[i]; + int rot = random_upto(rs, 4); + tiles[i] = ROT(orig, rot); + this_loopsquares++; + } + } + sfree(loops); + if (this_loopsquares > prev_loopsquares) { + /* + * We're increasing rather than reducing the number of + * loops. Give up and go back to the full shuffle. + */ + goto shuffle; + } + if (this_loopsquares == 0) + break; + prev_loopsquares = this_loopsquares; + } + + mismatches = 0; + /* + * I can't even be bothered to check for mismatches across + * a wrapping edge, so I'm just going to enforce that there + * must be a mismatch across a non-wrapping edge, which is + * still always possible. + */ + for (y = 0; y < h; y++) for (x = 0; x < w; x++) { + if (x+1 < w && ((ROT(index(params, tiles, x, y), 2) ^ + index(params, tiles, x+1, y)) & L)) + mismatches++; + if (y+1 < h && ((ROT(index(params, tiles, x, y), 2) ^ + index(params, tiles, x, y+1)) & U)) + mismatches++; + } + + if (mismatches == 0) + continue; + + /* OK. */ + break; } /* @@ -1468,13 +1598,7 @@ static char *new_game_desc(game_params *params, random_state *rs, return desc; } -static void game_free_aux_info(game_aux_info *aux) -{ - sfree(aux->tiles); - sfree(aux); -} - -static char *validate_desc(game_params *params, char *desc) +static char *validate_desc(const game_params *params, const char *desc) { int w = params->width, h = params->height; int i; @@ -1504,7 +1628,8 @@ static char *validate_desc(game_params *params, char *desc) * Construct an initial game state, given a description and parameters. */ -static game_state *new_game(game_params *params, char *desc) +static game_state *new_game(midend *me, const game_params *params, + const char *desc) { game_state *state; int w, h, x, y; @@ -1518,11 +1643,9 @@ static game_state *new_game(game_params *params, char *desc) state = snew(game_state); w = state->width = params->width; h = state->height = params->height; - state->cx = state->width / 2; - state->cy = state->height / 2; state->wrapping = params->wrapping; state->last_rotate_dir = state->last_rotate_x = state->last_rotate_y = 0; - state->completed = state->used_solve = state->just_used_solve = FALSE; + state->completed = state->used_solve = FALSE; state->tiles = snewn(state->width * state->height, unsigned char); memset(state->tiles, 0, state->width * state->height); state->barriers = snewn(state->width * state->height, unsigned char); @@ -1571,72 +1694,37 @@ static game_state *new_game(game_params *params, char *desc) barrier(state, 0, y) |= L; barrier(state, state->width-1, y) |= R; } - } - - /* - * Set up the barrier corner flags, for drawing barriers - * prettily when they meet. - */ - for (y = 0; y < state->height; y++) { - for (x = 0; x < state->width; x++) { - int dir; - - for (dir = 1; dir < 0x10; dir <<= 1) { - int dir2 = A(dir); - int x1, y1, x2, y2, x3, y3; - int corner = FALSE; - - if (!(barrier(state, x, y) & dir)) - continue; - - if (barrier(state, x, y) & dir2) - corner = TRUE; - - x1 = x + X(dir), y1 = y + Y(dir); - if (x1 >= 0 && x1 < state->width && - y1 >= 0 && y1 < state->height && - (barrier(state, x1, y1) & dir2)) - corner = TRUE; - - x2 = x + X(dir2), y2 = y + Y(dir2); - if (x2 >= 0 && x2 < state->width && - y2 >= 0 && y2 < state->height && - (barrier(state, x2, y2) & dir)) - corner = TRUE; - - if (corner) { - barrier(state, x, y) |= (dir << 4); - if (x1 >= 0 && x1 < state->width && - y1 >= 0 && y1 < state->height) - barrier(state, x1, y1) |= (A(dir) << 4); - if (x2 >= 0 && x2 < state->width && - y2 >= 0 && y2 < state->height) - barrier(state, x2, y2) |= (C(dir) << 4); - x3 = x + X(dir) + X(dir2), y3 = y + Y(dir) + Y(dir2); - if (x3 >= 0 && x3 < state->width && - y3 >= 0 && y3 < state->height) - barrier(state, x3, y3) |= (F(dir) << 4); - } - } - } + } else { + /* + * We check whether this is de-facto a non-wrapping game + * despite the parameters, in case we were passed the + * description of a non-wrapping game. This is so that we + * can change some aspects of the UI behaviour. + */ + state->wrapping = FALSE; + for (x = 0; x < state->width; x++) + if (!(barrier(state, x, 0) & U) || + !(barrier(state, x, state->height-1) & D)) + state->wrapping = TRUE; + for (y = 0; y < state->height; y++) + if (!(barrier(state, 0, y) & L) || + !(barrier(state, state->width-1, y) & R)) + state->wrapping = TRUE; } return state; } -static game_state *dup_game(game_state *state) +static game_state *dup_game(const game_state *state) { game_state *ret; ret = snew(game_state); ret->width = state->width; ret->height = state->height; - ret->cx = state->cx; - ret->cy = state->cy; ret->wrapping = state->wrapping; ret->completed = state->completed; ret->used_solve = state->used_solve; - ret->just_used_solve = state->just_used_solve; ret->last_rotate_dir = state->last_rotate_dir; ret->last_rotate_x = state->last_rotate_x; ret->last_rotate_y = state->last_rotate_y; @@ -1655,32 +1743,107 @@ static void free_game(game_state *state) sfree(state); } -static game_state *solve_game(game_state *state, game_aux_info *aux, - char **error) +static char *solve_game(const game_state *state, const game_state *currstate, + const char *aux, char **error) { - game_state *ret; + unsigned char *tiles; + char *ret; + int retlen, retsize; + int i; + + tiles = snewn(state->width * state->height, unsigned char); if (!aux) { /* * Run the internal solver on the provided grid. This might * not yield a complete solution. */ - ret = dup_game(state); - net_solver(ret->width, ret->height, ret->tiles, - ret->barriers, ret->wrapping); + memcpy(tiles, state->tiles, state->width * state->height); + net_solver(state->width, state->height, tiles, + state->barriers, state->wrapping); } else { - assert(aux->width == state->width); - assert(aux->height == state->height); - ret = dup_game(state); - memcpy(ret->tiles, aux->tiles, ret->width * ret->height); - ret->used_solve = ret->just_used_solve = TRUE; - ret->completed = TRUE; + for (i = 0; i < state->width * state->height; i++) { + int c = aux[i]; + + if (c >= '0' && c <= '9') + tiles[i] = c - '0'; + else if (c >= 'a' && c <= 'f') + tiles[i] = c - 'a' + 10; + else if (c >= 'A' && c <= 'F') + tiles[i] = c - 'A' + 10; + + tiles[i] |= LOCKED; + } } + /* + * Now construct a string which can be passed to execute_move() + * to transform the current grid into the solved one. + */ + retsize = 256; + ret = snewn(retsize, char); + retlen = 0; + ret[retlen++] = 'S'; + + for (i = 0; i < state->width * state->height; i++) { + int from = currstate->tiles[i], to = tiles[i]; + int ft = from & (R|L|U|D), tt = to & (R|L|U|D); + int x = i % state->width, y = i / state->width; + int chr = '\0'; + char buf[80], *p = buf; + + if (from == to) + continue; /* nothing needs doing at all */ + + /* + * To transform this tile into the desired tile: first + * unlock the tile if it's locked, then rotate it if + * necessary, then lock it if necessary. + */ + if (from & LOCKED) + p += sprintf(p, ";L%d,%d", x, y); + + if (tt == A(ft)) + chr = 'A'; + else if (tt == C(ft)) + chr = 'C'; + else if (tt == F(ft)) + chr = 'F'; + else { + assert(tt == ft); + chr = '\0'; + } + if (chr) + p += sprintf(p, ";%c%d,%d", chr, x, y); + + if (to & LOCKED) + p += sprintf(p, ";L%d,%d", x, y); + + if (p > buf) { + if (retlen + (p - buf) >= retsize) { + retsize = retlen + (p - buf) + 512; + ret = sresize(ret, retsize, char); + } + memcpy(ret+retlen, buf, p - buf); + retlen += p - buf; + } + } + + assert(retlen < retsize); + ret[retlen] = '\0'; + ret = sresize(ret, retlen+1, char); + + sfree(tiles); + return ret; } -static char *game_text_format(game_state *state) +static int game_can_format_as_text_now(const game_params *params) +{ + return TRUE; +} + +static char *game_text_format(const game_state *state) { return NULL; } @@ -1696,7 +1859,7 @@ static char *game_text_format(game_state *state) * completed - just call this function and see whether every square * is marked active. */ -static unsigned char *compute_active(game_state *state) +static unsigned char *compute_active(const game_state *state, int cx, int cy) { unsigned char *active; tree234 *todo; @@ -1710,8 +1873,8 @@ static unsigned char *compute_active(game_state *state) * xyd_cmp and just store direction 0 every time. */ todo = newtree234(xyd_cmp_nc); - index(state, active, state->cx, state->cy) = ACTIVE; - add234(todo, new_xyd(state->cx, state->cy, 0)); + index(state, active, cx, cy) = ACTIVE; + add234(todo, new_xyd(cx, cy, 0)); while ( (xyd = delpos234(todo, 0)) != NULL) { int x1, y1, d1, x2, y2, d2; @@ -1746,22 +1909,109 @@ static unsigned char *compute_active(game_state *state) return active; } +struct net_neighbour_ctx { + int w, h; + const unsigned char *tiles, *barriers; + int i, n, neighbours[4]; +}; +static int net_neighbour(int vertex, void *vctx) +{ + struct net_neighbour_ctx *ctx = (struct net_neighbour_ctx *)vctx; + + if (vertex >= 0) { + int x = vertex % ctx->w, y = vertex / ctx->w; + int tile, dir, x1, y1, v1; + + ctx->i = ctx->n = 0; + + tile = ctx->tiles[vertex]; + if (ctx->barriers) + tile &= ~ctx->barriers[vertex]; + + for (dir = 1; dir < 0x10; dir <<= 1) { + if (!(tile & dir)) + continue; + OFFSETWH(x1, y1, x, y, dir, ctx->w, ctx->h); + v1 = y1 * ctx->w + x1; + if (ctx->tiles[v1] & F(dir)) + ctx->neighbours[ctx->n++] = v1; + } + } + + if (ctx->i < ctx->n) + return ctx->neighbours[ctx->i++]; + else + return -1; +} + +static int *compute_loops_inner(int w, int h, int wrapping, + const unsigned char *tiles, + const unsigned char *barriers) +{ + struct net_neighbour_ctx ctx; + struct findloopstate *fls; + int *loops; + int x, y; + + fls = findloop_new_state(w*h); + ctx.w = w; + ctx.h = h; + ctx.tiles = tiles; + ctx.barriers = barriers; + findloop_run(fls, w*h, net_neighbour, &ctx); + + loops = snewn(w*h, int); + + for (y = 0; y < h; y++) { + for (x = 0; x < w; x++) { + int x1, y1, dir; + int flags = 0; + + for (dir = 1; dir < 0x10; dir <<= 1) { + if ((tiles[y*w+x] & dir) && + !(barriers && (barriers[y*w+x] & dir))) { + OFFSETWH(x1, y1, x, y, dir, w, h); + if ((tiles[y1*w+x1] & F(dir)) && + findloop_is_loop_edge(fls, y*w+x, y1*w+x1)) + flags |= LOOP(dir); + } + } + loops[y*w+x] = flags; + } + } + + findloop_free_state(fls); + return loops; +} + +static int *compute_loops(const game_state *state) +{ + return compute_loops_inner(state->width, state->height, state->wrapping, + state->tiles, state->barriers); +} + struct game_ui { + int org_x, org_y; /* origin */ + int cx, cy; /* source tile (game coordinates) */ int cur_x, cur_y; int cur_visible; random_state *rs; /* used for jumbling */ +#ifdef USE_DRAGGING + int dragtilex, dragtiley, dragstartx, dragstarty, dragged; +#endif }; -static game_ui *new_ui(game_state *state) +static game_ui *new_ui(const game_state *state) { void *seed; int seedsize; game_ui *ui = snew(game_ui); - ui->cur_x = state->width / 2; - ui->cur_y = state->height / 2; + ui->org_x = ui->org_y = 0; + ui->cur_x = ui->cx = state->width / 2; + ui->cur_y = ui->cy = state->height / 2; ui->cur_visible = FALSE; get_random_seed(&seed, &seedsize); - ui->rs = random_init(seed, seedsize); + ui->rs = random_new(seed, seedsize); sfree(seed); return ui; @@ -1773,24 +2023,68 @@ static void free_ui(game_ui *ui) sfree(ui); } +static char *encode_ui(const game_ui *ui) +{ + char buf[120]; + /* + * We preserve the origin and centre-point coordinates over a + * serialise. + */ + sprintf(buf, "O%d,%d;C%d,%d", ui->org_x, ui->org_y, ui->cx, ui->cy); + return dupstr(buf); +} + +static void decode_ui(game_ui *ui, const char *encoding) +{ + sscanf(encoding, "O%d,%d;C%d,%d", + &ui->org_x, &ui->org_y, &ui->cx, &ui->cy); +} + +static void game_changed_state(game_ui *ui, const game_state *oldstate, + const game_state *newstate) +{ +} + +struct game_drawstate { + int started; + int width, height; + int org_x, org_y; + int tilesize; + int *visible; +}; + /* ---------------------------------------------------------------------- * Process a move. */ -static game_state *make_move(game_state *state, game_ui *ui, - int x, int y, int button) +static char *interpret_move(const game_state *state, game_ui *ui, + const game_drawstate *ds, + int x, int y, int button) { - game_state *ret, *nullret; - int tx, ty, orig; - + char *nullret; + int tx = -1, ty = -1, dir = 0; + int shift = button & MOD_SHFT, ctrl = button & MOD_CTRL; + enum { + NONE, ROTATE_LEFT, ROTATE_180, ROTATE_RIGHT, TOGGLE_LOCK, JUMBLE, + MOVE_ORIGIN, MOVE_SOURCE, MOVE_ORIGIN_AND_SOURCE, MOVE_CURSOR + } action; + + button &= ~MOD_MASK; nullret = NULL; + action = NONE; if (button == LEFT_BUTTON || button == MIDDLE_BUTTON || +#ifdef USE_DRAGGING + button == LEFT_DRAG || + button == LEFT_RELEASE || + button == RIGHT_DRAG || + button == RIGHT_RELEASE || +#endif button == RIGHT_BUTTON) { if (ui->cur_visible) { ui->cur_visible = FALSE; - nullret = state; + nullret = ""; } /* @@ -1804,38 +2098,149 @@ static game_state *make_move(game_state *state, game_ui *ui, ty = y / TILE_SIZE; if (tx >= state->width || ty >= state->height) return nullret; + /* Transform from physical to game coords */ + tx = (tx + ui->org_x) % state->width; + ty = (ty + ui->org_y) % state->height; if (x % TILE_SIZE >= TILE_SIZE - TILE_BORDER || y % TILE_SIZE >= TILE_SIZE - TILE_BORDER) return nullret; - } else if (button == CURSOR_UP || button == CURSOR_DOWN || - button == CURSOR_RIGHT || button == CURSOR_LEFT) { - if (button == CURSOR_UP && ui->cur_y > 0) - ui->cur_y--; - else if (button == CURSOR_DOWN && ui->cur_y < state->height-1) - ui->cur_y++; - else if (button == CURSOR_LEFT && ui->cur_x > 0) - ui->cur_x--; - else if (button == CURSOR_RIGHT && ui->cur_x < state->width-1) - ui->cur_x++; - else - return nullret; /* no cursor movement */ - ui->cur_visible = TRUE; - return state; /* UI activity has occurred */ + +#ifdef USE_DRAGGING + + if (button == MIDDLE_BUTTON +#ifdef STYLUS_BASED + || button == RIGHT_BUTTON /* with a stylus, `right-click' locks */ +#endif + ) { + /* + * Middle button never drags: it only toggles the lock. + */ + action = TOGGLE_LOCK; + } else if (button == LEFT_BUTTON +#ifndef STYLUS_BASED + || button == RIGHT_BUTTON /* (see above) */ +#endif + ) { + /* + * Otherwise, we note down the start point for a drag. + */ + ui->dragtilex = tx; + ui->dragtiley = ty; + ui->dragstartx = x % TILE_SIZE; + ui->dragstarty = y % TILE_SIZE; + ui->dragged = FALSE; + return nullret; /* no actual action */ + } else if (button == LEFT_DRAG +#ifndef STYLUS_BASED + || button == RIGHT_DRAG +#endif + ) { + /* + * Find the new drag point and see if it necessitates a + * rotation. + */ + int x0,y0, xA,yA, xC,yC, xF,yF; + int mx, my; + int d0, dA, dC, dF, dmin; + + tx = ui->dragtilex; + ty = ui->dragtiley; + + mx = x - (ui->dragtilex * TILE_SIZE); + my = y - (ui->dragtiley * TILE_SIZE); + + x0 = ui->dragstartx; + y0 = ui->dragstarty; + xA = ui->dragstarty; + yA = TILE_SIZE-1 - ui->dragstartx; + xF = TILE_SIZE-1 - ui->dragstartx; + yF = TILE_SIZE-1 - ui->dragstarty; + xC = TILE_SIZE-1 - ui->dragstarty; + yC = ui->dragstartx; + + d0 = (mx-x0)*(mx-x0) + (my-y0)*(my-y0); + dA = (mx-xA)*(mx-xA) + (my-yA)*(my-yA); + dF = (mx-xF)*(mx-xF) + (my-yF)*(my-yF); + dC = (mx-xC)*(mx-xC) + (my-yC)*(my-yC); + + dmin = min(min(d0,dA),min(dF,dC)); + + if (d0 == dmin) { + return nullret; + } else if (dF == dmin) { + action = ROTATE_180; + ui->dragstartx = xF; + ui->dragstarty = yF; + ui->dragged = TRUE; + } else if (dA == dmin) { + action = ROTATE_LEFT; + ui->dragstartx = xA; + ui->dragstarty = yA; + ui->dragged = TRUE; + } else /* dC == dmin */ { + action = ROTATE_RIGHT; + ui->dragstartx = xC; + ui->dragstarty = yC; + ui->dragged = TRUE; + } + } else if (button == LEFT_RELEASE +#ifndef STYLUS_BASED + || button == RIGHT_RELEASE +#endif + ) { + if (!ui->dragged) { + /* + * There was a click but no perceptible drag: + * revert to single-click behaviour. + */ + tx = ui->dragtilex; + ty = ui->dragtiley; + + if (button == LEFT_RELEASE) + action = ROTATE_LEFT; + else + action = ROTATE_RIGHT; + } else + return nullret; /* no action */ + } + +#else /* USE_DRAGGING */ + + action = (button == LEFT_BUTTON ? ROTATE_LEFT : + button == RIGHT_BUTTON ? ROTATE_RIGHT : TOGGLE_LOCK); + +#endif /* USE_DRAGGING */ + + } else if (IS_CURSOR_MOVE(button)) { + switch (button) { + case CURSOR_UP: dir = U; break; + case CURSOR_DOWN: dir = D; break; + case CURSOR_LEFT: dir = L; break; + case CURSOR_RIGHT: dir = R; break; + default: return nullret; + } + if (shift && ctrl) action = MOVE_ORIGIN_AND_SOURCE; + else if (shift) action = MOVE_ORIGIN; + else if (ctrl) action = MOVE_SOURCE; + else action = MOVE_CURSOR; } else if (button == 'a' || button == 's' || button == 'd' || - button == 'A' || button == 'S' || button == 'D') { + button == 'A' || button == 'S' || button == 'D' || + button == 'f' || button == 'F' || + IS_CURSOR_SELECT(button)) { tx = ui->cur_x; ty = ui->cur_y; - if (button == 'a' || button == 'A') - button = LEFT_BUTTON; - else if (button == 's' || button == 'S') - button = MIDDLE_BUTTON; + if (button == 'a' || button == 'A' || button == CURSOR_SELECT) + action = ROTATE_LEFT; + else if (button == 's' || button == 'S' || button == CURSOR_SELECT2) + action = TOGGLE_LOCK; else if (button == 'd' || button == 'D') - button = RIGHT_BUTTON; + action = ROTATE_RIGHT; + else if (button == 'f' || button == 'F') + action = ROTATE_180; ui->cur_visible = TRUE; } else if (button == 'j' || button == 'J') { /* XXX should we have some mouse control for this? */ - button = 'J'; /* canonify */ - tx = ty = -1; /* shut gcc up :( */ + action = JUMBLE; } else return nullret; @@ -1849,15 +2254,13 @@ static game_state *make_move(game_state *state, game_ui *ui, * accident. If they change their mind, another middle click * unlocks it.) */ - if (button == MIDDLE_BUTTON) { - - ret = dup_game(state); - ret->just_used_solve = FALSE; - tile(ret, tx, ty) ^= LOCKED; - ret->last_rotate_dir = ret->last_rotate_x = ret->last_rotate_y = 0; - return ret; - - } else if (button == LEFT_BUTTON || button == RIGHT_BUTTON) { + if (action == TOGGLE_LOCK) { + char buf[80]; + sprintf(buf, "L%d,%d", tx, ty); + return dupstr(buf); + } else if (action == ROTATE_LEFT || action == ROTATE_RIGHT || + action == ROTATE_180) { + char buf[80]; /* * The left and right buttons have no effect if clicked on a @@ -1870,46 +2273,129 @@ static game_state *make_move(game_state *state, game_ui *ui, * Otherwise, turn the tile one way or the other. Left button * turns anticlockwise; right button turns clockwise. */ - ret = dup_game(state); - ret->just_used_solve = FALSE; - orig = tile(ret, tx, ty); - if (button == LEFT_BUTTON) { - tile(ret, tx, ty) = A(orig); - ret->last_rotate_dir = +1; - } else { - tile(ret, tx, ty) = C(orig); - ret->last_rotate_dir = -1; - } - ret->last_rotate_x = tx; - ret->last_rotate_y = ty; - - } else if (button == 'J') { - + sprintf(buf, "%c%d,%d", (int)(action == ROTATE_LEFT ? 'A' : + action == ROTATE_RIGHT ? 'C' : 'F'), tx, ty); + return dupstr(buf); + } else if (action == JUMBLE) { /* * Jumble all unlocked tiles to random orientations. */ - int jx, jy; - ret = dup_game(state); - ret->just_used_solve = FALSE; - for (jy = 0; jy < ret->height; jy++) { - for (jx = 0; jx < ret->width; jx++) { - if (!(tile(ret, jx, jy) & LOCKED)) { + + int jx, jy, maxlen; + char *ret, *p; + + /* + * Maximum string length assumes no int can be converted to + * decimal and take more than 11 digits! + */ + maxlen = state->width * state->height * 25 + 3; + + ret = snewn(maxlen, char); + p = ret; + *p++ = 'J'; + + for (jy = 0; jy < state->height; jy++) { + for (jx = 0; jx < state->width; jx++) { + if (!(tile(state, jx, jy) & LOCKED)) { int rot = random_upto(ui->rs, 4); - orig = tile(ret, jx, jy); - tile(ret, jx, jy) = ROT(orig, rot); + if (rot) { + p += sprintf(p, ";%c%d,%d", "AFC"[rot-1], jx, jy); + } } } } - ret->last_rotate_dir = 0; /* suppress animation */ - ret->last_rotate_x = ret->last_rotate_y = 0; + *p++ = '\0'; + assert(p - ret < maxlen); + ret = sresize(ret, p - ret, char); + + return ret; + } else if (action == MOVE_ORIGIN || action == MOVE_SOURCE || + action == MOVE_ORIGIN_AND_SOURCE || action == MOVE_CURSOR) { + assert(dir != 0); + if (action == MOVE_ORIGIN || action == MOVE_ORIGIN_AND_SOURCE) { + if (state->wrapping) { + OFFSET(ui->org_x, ui->org_y, ui->org_x, ui->org_y, dir, state); + } else return nullret; /* disallowed for non-wrapping grids */ + } + if (action == MOVE_SOURCE || action == MOVE_ORIGIN_AND_SOURCE) { + OFFSET(ui->cx, ui->cy, ui->cx, ui->cy, dir, state); + } + if (action == MOVE_CURSOR) { + OFFSET(ui->cur_x, ui->cur_y, ui->cur_x, ui->cur_y, dir, state); + ui->cur_visible = TRUE; + } + return ""; + } else { + return NULL; + } +} - } else assert(0); +static game_state *execute_move(const game_state *from, const char *move) +{ + game_state *ret; + int tx = -1, ty = -1, n, noanim, orig; + + ret = dup_game(from); + + if (move[0] == 'J' || move[0] == 'S') { + if (move[0] == 'S') + ret->used_solve = TRUE; + + move++; + if (*move == ';') + move++; + noanim = TRUE; + } else + noanim = FALSE; + + ret->last_rotate_dir = 0; /* suppress animation */ + ret->last_rotate_x = ret->last_rotate_y = 0; + + while (*move) { + if ((move[0] == 'A' || move[0] == 'C' || + move[0] == 'F' || move[0] == 'L') && + sscanf(move+1, "%d,%d%n", &tx, &ty, &n) >= 2 && + tx >= 0 && tx < from->width && ty >= 0 && ty < from->height) { + orig = tile(ret, tx, ty); + if (move[0] == 'A') { + tile(ret, tx, ty) = A(orig); + if (!noanim) + ret->last_rotate_dir = +1; + } else if (move[0] == 'F') { + tile(ret, tx, ty) = F(orig); + if (!noanim) + ret->last_rotate_dir = +2; /* + for sake of argument */ + } else if (move[0] == 'C') { + tile(ret, tx, ty) = C(orig); + if (!noanim) + ret->last_rotate_dir = -1; + } else { + assert(move[0] == 'L'); + tile(ret, tx, ty) ^= LOCKED; + } + + move += 1 + n; + if (*move == ';') move++; + } else { + free_game(ret); + return NULL; + } + } + if (!noanim) { + if (tx == -1 || ty == -1) { free_game(ret); return NULL; } + ret->last_rotate_x = tx; + ret->last_rotate_y = ty; + } /* * Check whether the game has been completed. + * + * For this purpose it doesn't matter where the source square + * is, because we can start from anywhere and correctly + * determine whether the game is completed. */ { - unsigned char *active = compute_active(ret); + unsigned char *active = compute_active(ret, 0, 0); int x1, y1; int complete = TRUE; @@ -1930,42 +2416,48 @@ static game_state *make_move(game_state *state, game_ui *ui, return ret; } + /* ---------------------------------------------------------------------- * Routines for drawing the game position on the screen. */ -struct game_drawstate { - int started; - int width, height; - unsigned char *visible; -}; - -static game_drawstate *game_new_drawstate(game_state *state) +static game_drawstate *game_new_drawstate(drawing *dr, const game_state *state) { game_drawstate *ds = snew(game_drawstate); + int i; ds->started = FALSE; ds->width = state->width; ds->height = state->height; - ds->visible = snewn(state->width * state->height, unsigned char); - memset(ds->visible, 0xFF, state->width * state->height); + ds->org_x = ds->org_y = -1; + ds->visible = snewn(state->width * state->height, int); + ds->tilesize = 0; /* undecided yet */ + for (i = 0; i < state->width * state->height; i++) + ds->visible[i] = -1; return ds; } -static void game_free_drawstate(game_drawstate *ds) +static void game_free_drawstate(drawing *dr, game_drawstate *ds) { sfree(ds->visible); sfree(ds); } -static void game_size(game_params *params, int *x, int *y) +static void game_compute_size(const game_params *params, int tilesize, + int *x, int *y) { - *x = WINDOW_OFFSET * 2 + TILE_SIZE * params->width + TILE_BORDER; - *y = WINDOW_OFFSET * 2 + TILE_SIZE * params->height + TILE_BORDER; + *x = WINDOW_OFFSET * 2 + tilesize * params->width + TILE_BORDER; + *y = WINDOW_OFFSET * 2 + tilesize * params->height + TILE_BORDER; } -static float *game_colours(frontend *fe, game_state *state, int *ncolours) +static void game_set_size(drawing *dr, game_drawstate *ds, + const game_params *params, int tilesize) +{ + ds->tilesize = tilesize; +} + +static float *game_colours(frontend *fe, int *ncolours) { float *ret; @@ -1999,6 +2491,13 @@ static float *game_colours(frontend *fe, game_state *state, int *ncolours) ret[COL_BARRIER * 3 + 1] = 0.0F; ret[COL_BARRIER * 3 + 2] = 0.0F; + /* + * Highlighted loops are red as well. + */ + ret[COL_LOOP * 3 + 0] = 1.0F; + ret[COL_LOOP * 3 + 1] = 0.0F; + ret[COL_LOOP * 3 + 2] = 0.0F; + /* * Unpowered endpoints are blue. */ @@ -2023,17 +2522,17 @@ static float *game_colours(frontend *fe, game_state *state, int *ncolours) return ret; } -static void draw_thick_line(frontend *fe, int x1, int y1, int x2, int y2, - int colour) +static void draw_filled_line(drawing *dr, int x1, int y1, int x2, int y2, + int colour) { - draw_line(fe, x1-1, y1, x2-1, y2, COL_WIRE); - draw_line(fe, x1+1, y1, x2+1, y2, COL_WIRE); - draw_line(fe, x1, y1-1, x2, y2-1, COL_WIRE); - draw_line(fe, x1, y1+1, x2, y2+1, COL_WIRE); - draw_line(fe, x1, y1, x2, y2, colour); + draw_line(dr, x1-1, y1, x2-1, y2, COL_WIRE); + draw_line(dr, x1+1, y1, x2+1, y2, COL_WIRE); + draw_line(dr, x1, y1-1, x2, y2-1, COL_WIRE); + draw_line(dr, x1, y1+1, x2, y2+1, COL_WIRE); + draw_line(dr, x1, y1, x2, y2, colour); } -static void draw_rect_coords(frontend *fe, int x1, int y1, int x2, int y2, +static void draw_rect_coords(drawing *dr, int x1, int y1, int x2, int y2, int colour) { int mx = (x1 < x2 ? x1 : x2); @@ -2041,38 +2540,38 @@ static void draw_rect_coords(frontend *fe, int x1, int y1, int x2, int y2, int dx = (x2 + x1 - 2*mx + 1); int dy = (y2 + y1 - 2*my + 1); - draw_rect(fe, mx, my, dx, dy, colour); + draw_rect(dr, mx, my, dx, dy, colour); } -static void draw_barrier_corner(frontend *fe, int x, int y, int dir, int phase) +/* + * draw_barrier_corner() and draw_barrier() are passed physical coords + */ +static void draw_barrier_corner(drawing *dr, game_drawstate *ds, + int x, int y, int dx, int dy, int phase) { int bx = WINDOW_OFFSET + TILE_SIZE * x; int by = WINDOW_OFFSET + TILE_SIZE * y; - int x1, y1, dx, dy, dir2; + int x1, y1; - dir >>= 4; - - dir2 = A(dir); - dx = X(dir) + X(dir2); - dy = Y(dir) + Y(dir2); x1 = (dx > 0 ? TILE_SIZE+TILE_BORDER-1 : 0); y1 = (dy > 0 ? TILE_SIZE+TILE_BORDER-1 : 0); if (phase == 0) { - draw_rect_coords(fe, bx+x1, by+y1, + draw_rect_coords(dr, bx+x1+dx, by+y1, bx+x1-TILE_BORDER*dx, by+y1-(TILE_BORDER-1)*dy, COL_WIRE); - draw_rect_coords(fe, bx+x1, by+y1, + draw_rect_coords(dr, bx+x1, by+y1+dy, bx+x1-(TILE_BORDER-1)*dx, by+y1-TILE_BORDER*dy, COL_WIRE); } else { - draw_rect_coords(fe, bx+x1, by+y1, + draw_rect_coords(dr, bx+x1, by+y1, bx+x1-(TILE_BORDER-1)*dx, by+y1-(TILE_BORDER-1)*dy, COL_BARRIER); } } -static void draw_barrier(frontend *fe, int x, int y, int dir, int phase) +static void draw_barrier(drawing *dr, game_drawstate *ds, + int x, int y, int dir, int phase) { int bx = WINDOW_OFFSET + TILE_SIZE * x; int by = WINDOW_OFFSET + TILE_SIZE * y; @@ -2084,14 +2583,17 @@ static void draw_barrier(frontend *fe, int x, int y, int dir, int phase) h = (Y(dir) ? TILE_BORDER : TILE_SIZE - TILE_BORDER); if (phase == 0) { - draw_rect(fe, bx+x1-X(dir), by+y1-Y(dir), w, h, COL_WIRE); + draw_rect(dr, bx+x1-X(dir), by+y1-Y(dir), w, h, COL_WIRE); } else { - draw_rect(fe, bx+x1, by+y1, w, h, COL_BARRIER); + draw_rect(dr, bx+x1, by+y1, w, h, COL_BARRIER); } } -static void draw_tile(frontend *fe, game_state *state, int x, int y, int tile, - float angle, int cursor) +/* + * draw_tile() is passed physical coordinates + */ +static void draw_tile(drawing *dr, const game_state *state, game_drawstate *ds, + int x, int y, int tile, int src, float angle, int cursor) { int bx = WINDOW_OFFSET + TILE_SIZE * x; int by = WINDOW_OFFSET + TILE_SIZE * y; @@ -2104,25 +2606,18 @@ static void draw_tile(frontend *fe, game_state *state, int x, int y, int tile, * and including the borders around the tile. This means that * if the neighbouring tiles have connections to those borders, * we must draw those connections on the borders themselves. - * - * This would be terribly fiddly if we ever had to draw a tile - * while its neighbour was in mid-rotate, because we'd have to - * arrange to _know_ that the neighbour was being rotated and - * hence had an anomalous effect on the redraw of this tile. - * Fortunately, the drawing algorithm avoids ever calling us in - * this circumstance: we're either drawing lots of straight - * tiles at game start or after a move is complete, or we're - * repeatedly drawing only the rotating tile. So no problem. */ + clip(dr, bx, by, TILE_SIZE+TILE_BORDER, TILE_SIZE+TILE_BORDER); + /* * So. First blank the tile out completely: draw a big * rectangle in border colour, and a smaller rectangle in * background colour to fill it in. */ - draw_rect(fe, bx, by, TILE_SIZE+TILE_BORDER, TILE_SIZE+TILE_BORDER, + draw_rect(dr, bx, by, TILE_SIZE+TILE_BORDER, TILE_SIZE+TILE_BORDER, COL_BORDER); - draw_rect(fe, bx+TILE_BORDER, by+TILE_BORDER, + draw_rect(dr, bx+TILE_BORDER, by+TILE_BORDER, TILE_SIZE-TILE_BORDER, TILE_SIZE-TILE_BORDER, tile & LOCKED ? COL_LOCKED : COL_BACKGROUND); @@ -2132,16 +2627,16 @@ static void draw_tile(frontend *fe, game_state *state, int x, int y, int tile, * in. */ if (cursor) { - draw_line(fe, bx+TILE_SIZE/8, by+TILE_SIZE/8, + draw_line(dr, bx+TILE_SIZE/8, by+TILE_SIZE/8, bx+TILE_SIZE/8, by+TILE_SIZE-TILE_SIZE/8, tile & LOCKED ? COL_BACKGROUND : COL_LOCKED); - draw_line(fe, bx+TILE_SIZE/8, by+TILE_SIZE/8, + draw_line(dr, bx+TILE_SIZE/8, by+TILE_SIZE/8, bx+TILE_SIZE-TILE_SIZE/8, by+TILE_SIZE/8, tile & LOCKED ? COL_BACKGROUND : COL_LOCKED); - draw_line(fe, bx+TILE_SIZE-TILE_SIZE/8, by+TILE_SIZE/8, + draw_line(dr, bx+TILE_SIZE-TILE_SIZE/8, by+TILE_SIZE/8, bx+TILE_SIZE-TILE_SIZE/8, by+TILE_SIZE-TILE_SIZE/8, tile & LOCKED ? COL_BACKGROUND : COL_LOCKED); - draw_line(fe, bx+TILE_SIZE/8, by+TILE_SIZE-TILE_SIZE/8, + draw_line(dr, bx+TILE_SIZE/8, by+TILE_SIZE-TILE_SIZE/8, bx+TILE_SIZE-TILE_SIZE/8, by+TILE_SIZE-TILE_SIZE/8, tile & LOCKED ? COL_BACKGROUND : COL_LOCKED); } @@ -2164,9 +2659,9 @@ static void draw_tile(frontend *fe, game_state *state, int x, int y, int tile, ex = (TILE_SIZE - TILE_BORDER - 1.0F) / 2.0F * X(dir); ey = (TILE_SIZE - TILE_BORDER - 1.0F) / 2.0F * Y(dir); MATMUL(tx, ty, matrix, ex, ey); - draw_thick_line(fe, bx+(int)cx, by+(int)cy, - bx+(int)(cx+tx), by+(int)(cy+ty), - COL_WIRE); + draw_filled_line(dr, bx+(int)cx, by+(int)cy, + bx+(int)(cx+tx), by+(int)(cy+ty), + COL_WIRE); } } for (dir = 1; dir < 0x10; dir <<= 1) { @@ -2174,10 +2669,15 @@ static void draw_tile(frontend *fe, game_state *state, int x, int y, int tile, ex = (TILE_SIZE - TILE_BORDER - 1.0F) / 2.0F * X(dir); ey = (TILE_SIZE - TILE_BORDER - 1.0F) / 2.0F * Y(dir); MATMUL(tx, ty, matrix, ex, ey); - draw_line(fe, bx+(int)cx, by+(int)cy, - bx+(int)(cx+tx), by+(int)(cy+ty), col); + draw_line(dr, bx+(int)cx, by+(int)cy, + bx+(int)(cx+tx), by+(int)(cy+ty), + (tile & LOOP(dir)) ? COL_LOOP : col); } } + /* If we've drawn any loop-highlighted arms, make sure the centre + * point is loop-coloured rather than a later arm overwriting it. */ + if (tile & (RLOOP | ULOOP | LLOOP | DLOOP)) + draw_rect(dr, bx+(int)cx, by+(int)cy, 1, 1, COL_LOOP); /* * Draw the box in the middle. We do this in blue if the tile @@ -2186,7 +2686,7 @@ static void draw_tile(frontend *fe, game_state *state, int x, int y, int tile, * otherwise not at all. */ col = -1; - if (x == state->cx && y == state->cy) + if (src) col = COL_WIRE; else if (COUNT(tile) == 1) { col = (tile & ACTIVE ? COL_POWERED : COL_ENDPOINT); @@ -2207,8 +2707,7 @@ static void draw_tile(frontend *fe, game_state *state, int x, int y, int tile, points[i+1] = by+(int)(cy+ty); } - draw_polygon(fe, points, 4, TRUE, col); - draw_polygon(fe, points, 4, FALSE, COL_WIRE); + draw_polygon(dr, points, 4, col, COL_WIRE); } /* @@ -2227,7 +2726,7 @@ static void draw_tile(frontend *fe, game_state *state, int x, int y, int tile, if (ox < 0 || ox >= state->width || oy < 0 || oy >= state->height) continue; - if (!(tile(state, ox, oy) & F(dir))) + if (!(tile(state, GX(ox), GY(oy)) & F(dir))) continue; px = bx + (int)(dx>0 ? TILE_SIZE + TILE_BORDER - 1 : dx<0 ? 0 : cx); @@ -2245,16 +2744,18 @@ static void draw_tile(frontend *fe, game_state *state, int x, int y, int tile, * in: if we are fully connected to the other tile then * the two ACTIVE states will be the same.) */ - draw_rect_coords(fe, px-vx, py-vy, px+lx+vx, py+ly+vy, COL_WIRE); - draw_rect_coords(fe, px, py, px+lx, py+ly, - (tile & ACTIVE) ? COL_POWERED : COL_WIRE); + draw_rect_coords(dr, px-vx, py-vy, px+lx+vx, py+ly+vy, COL_WIRE); + draw_rect_coords(dr, px, py, px+lx, py+ly, + ((tile & LOOP(dir)) ? COL_LOOP : + (tile & ACTIVE) ? COL_POWERED : + COL_WIRE)); } else { /* * The other tile extends into our border, but isn't * actually connected to us. Just draw a single black * dot. */ - draw_rect_coords(fe, px, py, px, py, COL_WIRE); + draw_rect_coords(dr, px, py, px, py, COL_WIRE); } } @@ -2262,71 +2763,128 @@ static void draw_tile(frontend *fe, game_state *state, int x, int y, int tile, * Draw barrier corners, and then barriers. */ for (phase = 0; phase < 2; phase++) { + for (dir = 1; dir < 0x10; dir <<= 1) { + int x1, y1, corner = FALSE; + /* + * If at least one barrier terminates at the corner + * between dir and A(dir), draw a barrier corner. + */ + if (barrier(state, GX(x), GY(y)) & (dir | A(dir))) { + corner = TRUE; + } else { + /* + * Only count barriers terminating at this corner + * if they're physically next to the corner. (That + * is, if they've wrapped round from the far side + * of the screen, they don't count.) + */ + x1 = x + X(dir); + y1 = y + Y(dir); + if (x1 >= 0 && x1 < state->width && + y1 >= 0 && y1 < state->height && + (barrier(state, GX(x1), GY(y1)) & A(dir))) { + corner = TRUE; + } else { + x1 = x + X(A(dir)); + y1 = y + Y(A(dir)); + if (x1 >= 0 && x1 < state->width && + y1 >= 0 && y1 < state->height && + (barrier(state, GX(x1), GY(y1)) & dir)) + corner = TRUE; + } + } + + if (corner) { + /* + * At least one barrier terminates here. Draw a + * corner. + */ + draw_barrier_corner(dr, ds, x, y, + X(dir)+X(A(dir)), Y(dir)+Y(A(dir)), + phase); + } + } + for (dir = 1; dir < 0x10; dir <<= 1) - if (barrier(state, x, y) & (dir << 4)) - draw_barrier_corner(fe, x, y, dir << 4, phase); - for (dir = 1; dir < 0x10; dir <<= 1) - if (barrier(state, x, y) & dir) - draw_barrier(fe, x, y, dir, phase); + if (barrier(state, GX(x), GY(y)) & dir) + draw_barrier(dr, ds, x, y, dir, phase); } - draw_update(fe, bx, by, TILE_SIZE+TILE_BORDER, TILE_SIZE+TILE_BORDER); + unclip(dr); + + draw_update(dr, bx, by, TILE_SIZE+TILE_BORDER, TILE_SIZE+TILE_BORDER); } -static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate, - game_state *state, int dir, game_ui *ui, float t, float ft) +static void game_redraw(drawing *dr, game_drawstate *ds, + const game_state *oldstate, const game_state *state, + int dir, const game_ui *ui, + float t, float ft) { - int x, y, tx, ty, frame, last_rotate_dir; + int x, y, tx, ty, frame, last_rotate_dir, moved_origin = FALSE; unsigned char *active; + int *loops; float angle = 0.0; /* - * Clear the screen and draw the exterior barrier lines if this - * is our first call. + * Clear the screen, and draw the exterior barrier lines, if + * this is our first call or if the origin has changed. */ - if (!ds->started) { + if (!ds->started || ui->org_x != ds->org_x || ui->org_y != ds->org_y) { int phase; ds->started = TRUE; - draw_rect(fe, 0, 0, + draw_rect(dr, 0, 0, WINDOW_OFFSET * 2 + TILE_SIZE * state->width + TILE_BORDER, WINDOW_OFFSET * 2 + TILE_SIZE * state->height + TILE_BORDER, COL_BACKGROUND); - draw_update(fe, 0, 0, + + ds->org_x = ui->org_x; + ds->org_y = ui->org_y; + moved_origin = TRUE; + + draw_update(dr, 0, 0, WINDOW_OFFSET*2 + TILE_SIZE*state->width + TILE_BORDER, WINDOW_OFFSET*2 + TILE_SIZE*state->height + TILE_BORDER); for (phase = 0; phase < 2; phase++) { for (x = 0; x < ds->width; x++) { - if (barrier(state, x, 0) & UL) - draw_barrier_corner(fe, x, -1, LD, phase); - if (barrier(state, x, 0) & RU) - draw_barrier_corner(fe, x, -1, DR, phase); - if (barrier(state, x, 0) & U) - draw_barrier(fe, x, -1, D, phase); - if (barrier(state, x, ds->height-1) & DR) - draw_barrier_corner(fe, x, ds->height, RU, phase); - if (barrier(state, x, ds->height-1) & LD) - draw_barrier_corner(fe, x, ds->height, UL, phase); - if (barrier(state, x, ds->height-1) & D) - draw_barrier(fe, x, ds->height, U, phase); + if (x+1 < ds->width) { + if (barrier(state, GX(x), GY(0)) & R) + draw_barrier_corner(dr, ds, x, -1, +1, +1, phase); + if (barrier(state, GX(x), GY(ds->height-1)) & R) + draw_barrier_corner(dr, ds, x, ds->height, +1, -1, phase); + } + if (barrier(state, GX(x), GY(0)) & U) { + draw_barrier_corner(dr, ds, x, -1, -1, +1, phase); + draw_barrier_corner(dr, ds, x, -1, +1, +1, phase); + draw_barrier(dr, ds, x, -1, D, phase); + } + if (barrier(state, GX(x), GY(ds->height-1)) & D) { + draw_barrier_corner(dr, ds, x, ds->height, -1, -1, phase); + draw_barrier_corner(dr, ds, x, ds->height, +1, -1, phase); + draw_barrier(dr, ds, x, ds->height, U, phase); + } } for (y = 0; y < ds->height; y++) { - if (barrier(state, 0, y) & UL) - draw_barrier_corner(fe, -1, y, RU, phase); - if (barrier(state, 0, y) & LD) - draw_barrier_corner(fe, -1, y, DR, phase); - if (barrier(state, 0, y) & L) - draw_barrier(fe, -1, y, R, phase); - if (barrier(state, ds->width-1, y) & RU) - draw_barrier_corner(fe, ds->width, y, UL, phase); - if (barrier(state, ds->width-1, y) & DR) - draw_barrier_corner(fe, ds->width, y, LD, phase); - if (barrier(state, ds->width-1, y) & R) - draw_barrier(fe, ds->width, y, L, phase); + if (y+1 < ds->height) { + if (barrier(state, GX(0), GY(y)) & D) + draw_barrier_corner(dr, ds, -1, y, +1, +1, phase); + if (barrier(state, GX(ds->width-1), GY(y)) & D) + draw_barrier_corner(dr, ds, ds->width, y, -1, +1, phase); + } + if (barrier(state, GX(0), GY(y)) & L) { + draw_barrier_corner(dr, ds, -1, y, +1, -1, phase); + draw_barrier_corner(dr, ds, -1, y, +1, +1, phase); + draw_barrier(dr, ds, -1, y, R, phase); + } + if (barrier(state, GX(ds->width-1), GY(y)) & R) { + draw_barrier_corner(dr, ds, ds->width, y, -1, -1, phase); + draw_barrier_corner(dr, ds, ds->width, y, -1, +1, phase); + draw_barrier(dr, ds, ds->width, y, L, phase); + } } } } @@ -2357,11 +2915,18 @@ static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate, /* * Draw any tile which differs from the way it was last drawn. */ - active = compute_active(state); + active = compute_active(state, ui->cx, ui->cy); + loops = compute_loops(state); for (x = 0; x < ds->width; x++) for (y = 0; y < ds->height; y++) { - unsigned char c = tile(state, x, y) | index(state, active, x, y); + int c = tile(state, GX(x), GY(y)) | + index(state, active, GX(x), GY(y)) | + index(state, loops, GX(x), GY(y)); + int is_src = GX(x) == ui->cx && GY(y) == ui->cy; + int is_anim = GX(x) == tx && GY(y) == ty; + int is_cursor = ui->cur_visible && + GX(x) == ui->cur_x && GY(y) == ui->cur_y; /* * In a completion flash, we adjust the LOCKED bit @@ -2369,9 +2934,10 @@ static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate, * the frame number. */ if (frame >= 0) { + int rcx = RX(ui->cx), rcy = RY(ui->cy); int xdist, ydist, dist; - xdist = (x < state->cx ? state->cx - x : x - state->cx); - ydist = (y < state->cy ? state->cy - y : y - state->cy); + xdist = (x < rcx ? rcx - x : x - rcx); + ydist = (y < rcy ? rcy - y : y - rcy); dist = (xdist > ydist ? xdist : ydist); if (frame >= dist && frame < dist+4) { @@ -2381,16 +2947,14 @@ static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate, } } - if (index(state, ds->visible, x, y) != c || - index(state, ds->visible, x, y) == 0xFF || - (x == tx && y == ty) || - (ui->cur_visible && x == ui->cur_x && y == ui->cur_y)) { - draw_tile(fe, state, x, y, c, - (x == tx && y == ty ? angle : 0.0F), - (ui->cur_visible && x == ui->cur_x && y == ui->cur_y)); - if ((x == tx && y == ty) || - (ui->cur_visible && x == ui->cur_x && y == ui->cur_y)) - index(state, ds->visible, x, y) = 0xFF; + if (moved_origin || + index(state, ds->visible, x, y) != c || + index(state, ds->visible, x, y) == -1 || + is_src || is_anim || is_cursor) { + draw_tile(dr, state, ds, x, y, c, + is_src, (is_anim ? angle : 0.0F), is_cursor); + if (is_src || is_anim || is_cursor) + index(state, ds->visible, x, y) = -1; else index(state, ds->visible, x, y) = c; } @@ -2415,24 +2979,18 @@ static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate, (state->used_solve ? "Auto-solved. " : state->completed ? "COMPLETED! " : ""), a, n2); - status_bar(fe, statusbuf); + status_bar(dr, statusbuf); } sfree(active); + sfree(loops); } -static float game_anim_length(game_state *oldstate, - game_state *newstate, int dir) +static float game_anim_length(const game_state *oldstate, + const game_state *newstate, int dir, game_ui *ui) { int last_rotate_dir; - /* - * Don't animate an auto-solve move. - */ - if ((dir > 0 && newstate->just_used_solve) || - (dir < 0 && oldstate->just_used_solve)) - return 0.0F; - /* * Don't animate if last_rotate_dir is zero. */ @@ -2444,8 +3002,8 @@ static float game_anim_length(game_state *oldstate, return 0.0F; } -static float game_flash_length(game_state *oldstate, - game_state *newstate, int dir) +static float game_flash_length(const game_state *oldstate, + const game_state *newstate, int dir, game_ui *ui) { /* * If the game has just been completed, we display a completion @@ -2453,33 +3011,168 @@ static float game_flash_length(game_state *oldstate, */ if (!oldstate->completed && newstate->completed && !oldstate->used_solve && !newstate->used_solve) { - int size; - size = 0; - if (size < newstate->cx+1) - size = newstate->cx+1; - if (size < newstate->cy+1) - size = newstate->cy+1; - if (size < newstate->width - newstate->cx) - size = newstate->width - newstate->cx; - if (size < newstate->height - newstate->cy) - size = newstate->height - newstate->cy; + int size = 0; + if (size < newstate->width) + size = newstate->width; + if (size < newstate->height) + size = newstate->height; return FLASH_FRAME * (size+4); } return 0.0F; } -static int game_wants_statusbar(void) +static int game_status(const game_state *state) +{ + return state->completed ? +1 : 0; +} + +static int game_timing_state(const game_state *state, game_ui *ui) { return TRUE; } +static void game_print_size(const game_params *params, float *x, float *y) +{ + int pw, ph; + + /* + * I'll use 8mm squares by default. + */ + game_compute_size(params, 800, &pw, &ph); + *x = pw / 100.0F; + *y = ph / 100.0F; +} + +static void draw_diagram(drawing *dr, game_drawstate *ds, int x, int y, + int topleft, int v, int drawlines, int ink) +{ + int tx, ty, cx, cy, r, br, k, thick; + + tx = WINDOW_OFFSET + TILE_SIZE * x; + ty = WINDOW_OFFSET + TILE_SIZE * y; + + /* + * Find our centre point. + */ + if (topleft) { + cx = tx + (v & L ? TILE_SIZE / 4 : TILE_SIZE / 6); + cy = ty + (v & U ? TILE_SIZE / 4 : TILE_SIZE / 6); + r = TILE_SIZE / 8; + br = TILE_SIZE / 32; + } else { + cx = tx + TILE_SIZE / 2; + cy = ty + TILE_SIZE / 2; + r = TILE_SIZE / 2; + br = TILE_SIZE / 8; + } + thick = r / 20; + + /* + * Draw the square block if we have an endpoint. + */ + if (v == 1 || v == 2 || v == 4 || v == 8) + draw_rect(dr, cx - br, cy - br, br*2, br*2, ink); + + /* + * Draw each radial line. + */ + if (drawlines) { + for (k = 1; k < 16; k *= 2) + if (v & k) { + int x1 = min(cx, cx + (r-thick) * X(k)); + int x2 = max(cx, cx + (r-thick) * X(k)); + int y1 = min(cy, cy + (r-thick) * Y(k)); + int y2 = max(cy, cy + (r-thick) * Y(k)); + draw_rect(dr, x1 - thick, y1 - thick, + (x2 - x1) + 2*thick, (y2 - y1) + 2*thick, ink); + } + } +} + +static void game_print(drawing *dr, const game_state *state, int tilesize) +{ + int w = state->width, h = state->height; + int ink = print_mono_colour(dr, 0); + int x, y; + + /* Ick: fake up `ds->tilesize' for macro expansion purposes */ + game_drawstate ads, *ds = &ads; + game_set_size(dr, ds, NULL, tilesize); + + /* + * Border. + */ + print_line_width(dr, TILE_SIZE / (state->wrapping ? 128 : 12)); + draw_rect_outline(dr, WINDOW_OFFSET, WINDOW_OFFSET, + TILE_SIZE * w, TILE_SIZE * h, ink); + + /* + * Grid. + */ + print_line_width(dr, TILE_SIZE / 128); + for (x = 1; x < w; x++) + draw_line(dr, WINDOW_OFFSET + TILE_SIZE * x, WINDOW_OFFSET, + WINDOW_OFFSET + TILE_SIZE * x, WINDOW_OFFSET + TILE_SIZE * h, + ink); + for (y = 1; y < h; y++) + draw_line(dr, WINDOW_OFFSET, WINDOW_OFFSET + TILE_SIZE * y, + WINDOW_OFFSET + TILE_SIZE * w, WINDOW_OFFSET + TILE_SIZE * y, + ink); + + /* + * Barriers. + */ + for (y = 0; y <= h; y++) + for (x = 0; x <= w; x++) { + int b = barrier(state, x % w, y % h); + if (x < w && (b & U)) + draw_rect(dr, WINDOW_OFFSET + TILE_SIZE * x - TILE_SIZE/24, + WINDOW_OFFSET + TILE_SIZE * y - TILE_SIZE/24, + TILE_SIZE + TILE_SIZE/24 * 2, TILE_SIZE/24 * 2, ink); + if (y < h && (b & L)) + draw_rect(dr, WINDOW_OFFSET + TILE_SIZE * x - TILE_SIZE/24, + WINDOW_OFFSET + TILE_SIZE * y - TILE_SIZE/24, + TILE_SIZE/24 * 2, TILE_SIZE + TILE_SIZE/24 * 2, ink); + } + + /* + * Grid contents. + */ + for (y = 0; y < h; y++) + for (x = 0; x < w; x++) { + int vx, v = tile(state, x, y); + int locked = v & LOCKED; + + v &= 0xF; + + /* + * Rotate into a standard orientation for the top left + * corner diagram. + */ + vx = v; + while (vx != 0 && vx != 15 && vx != 1 && vx != 9 && vx != 13 && + vx != 5) + vx = A(vx); + + /* + * Draw the top left corner diagram. + */ + draw_diagram(dr, ds, x, y, TRUE, vx, TRUE, ink); + + /* + * Draw the real solution diagram, if we're doing so. + */ + draw_diagram(dr, ds, x, y, FALSE, v, locked, ink); + } +} + #ifdef COMBINED #define thegame net #endif const struct game thegame = { - "Net", "games.net", + "Net", "games.net", "net", default_params, game_fetch_preset, decode_params, @@ -2489,22 +3182,29 @@ const struct game thegame = { TRUE, game_configure, custom_params, validate_params, new_game_desc, - game_free_aux_info, validate_desc, new_game, dup_game, free_game, TRUE, solve_game, - FALSE, game_text_format, + FALSE, game_can_format_as_text_now, game_text_format, new_ui, free_ui, - make_move, - game_size, + encode_ui, + decode_ui, + game_changed_state, + interpret_move, + execute_move, + PREFERRED_TILE_SIZE, game_compute_size, game_set_size, game_colours, game_new_drawstate, game_free_drawstate, game_redraw, game_anim_length, game_flash_length, - game_wants_statusbar, + game_status, + TRUE, FALSE, game_print_size, game_print, + TRUE, /* wants_statusbar */ + FALSE, game_timing_state, + 0, /* flags */ };