--- /dev/null
+/*
+ * signpost.c: implementation of the janko game 'arrow path'
+ *
+ * Remaining troublesome games:
+ *
+ * 4x4#438520052525454
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <ctype.h>
+#include <math.h>
+
+#include "puzzles.h"
+
+#define PREFERRED_TILE_SIZE 48
+#define TILE_SIZE (ds->tilesize)
+#define BLITTER_SIZE TILE_SIZE
+#define BORDER (TILE_SIZE / 2)
+
+#define COORD(x) ( (x) * TILE_SIZE + BORDER )
+#define FROMCOORD(x) ( ((x) - BORDER + TILE_SIZE) / TILE_SIZE - 1 )
+
+#define INGRID(s,x,y) ((x) >= 0 && (x) < (s)->w && (y) >= 0 && (y) < (s)->h)
+
+#define FLASH_SPIN 0.7F
+
+#define NBACKGROUNDS 16
+
+enum {
+ COL_BACKGROUND, COL_HIGHLIGHT, COL_LOWLIGHT,
+ COL_GRID, COL_CURSOR, COL_ERROR, COL_DRAG_ORIGIN,
+ COL_ARROW, COL_ARROW_BG_DIM,
+ COL_NUMBER, COL_NUMBER_SET, COL_NUMBER_SET_MID,
+ COL_B0, /* background colours */
+ COL_M0 = COL_B0 + 1*NBACKGROUNDS, /* mid arrow colours */
+ COL_D0 = COL_B0 + 2*NBACKGROUNDS, /* dim arrow colours */
+ COL_X0 = COL_B0 + 3*NBACKGROUNDS, /* dim arrow colours */
+ NCOLOURS = COL_B0 + 4*NBACKGROUNDS
+};
+
+struct game_params {
+ int w, h;
+ int force_corner_start;
+};
+
+enum { DIR_N = 0, DIR_NE, DIR_E, DIR_SE, DIR_S, DIR_SW, DIR_W, DIR_NW, DIR_MAX };
+static const char *dirstrings[8] = { "N ", "NE", "E ", "SE", "S ", "SW", "W ", "NW" };
+
+static const int dxs[DIR_MAX] = { 0, 1, 1, 1, 0, -1, -1, -1 };
+static const int dys[DIR_MAX] = { -1, -1, 0, 1, 1, 1, 0, -1 };
+
+#define DIR_OPPOSITE(d) ((d+4)%8)
+
+struct game_state {
+ int w, h, n;
+ int completed, used_solve, impossible;
+ int *dirs; /* direction enums, size n */
+ int *nums; /* numbers, size n */
+ unsigned int *flags; /* flags, size n */
+ int *next, *prev; /* links to other cell indexes, size n (-1 absent) */
+ int *dsf; /* connects regions with a dsf. */
+ int *numsi; /* for each number, which index is it in? (-1 absent) */
+};
+
+#define FLAG_IMMUTABLE 1
+#define FLAG_ERROR 2
+
+/* --- Generally useful functions --- */
+
+#define ISREALNUM(state, num) ((num) > 0 && (num) <= (state)->n)
+
+static int whichdir(int fromx, int fromy, int tox, int toy)
+{
+ int i, dx, dy;
+
+ dx = tox - fromx;
+ dy = toy - fromy;
+
+ if (dx && dy && abs(dx) != abs(dy)) return -1;
+
+ if (dx) dx = dx / abs(dx); /* limit to (-1, 0, 1) */
+ if (dy) dy = dy / abs(dy); /* ditto */
+
+ for (i = 0; i < DIR_MAX; i++) {
+ if (dx == dxs[i] && dy == dys[i]) return i;
+ }
+ return -1;
+}
+
+static int whichdiri(game_state *state, int fromi, int toi)
+{
+ int w = state->w;
+ return whichdir(fromi%w, fromi/w, toi%w, toi/w);
+}
+
+static int ispointing(game_state *state, int fromx, int fromy, int tox, int toy)
+{
+ int w = state->w, dir = state->dirs[fromy*w+fromx];
+
+ /* (by convention) squares do not point to themselves. */
+ if (fromx == tox && fromy == toy) return 0;
+
+ /* the final number points to nothing. */
+ if (state->nums[fromy*w + fromx] == state->n) return 0;
+
+ while (1) {
+ if (!INGRID(state, fromx, fromy)) return 0;
+ if (fromx == tox && fromy == toy) return 1;
+ fromx += dxs[dir]; fromy += dys[dir];
+ }
+ return 0; /* not reached */
+}
+
+static int ispointingi(game_state *state, int fromi, int toi)
+{
+ int w = state->w;
+ return ispointing(state, fromi%w, fromi/w, toi%w, toi/w);
+}
+
+/* Taking the number 'num', work out the gap between it and the next
+ * available number up or down (depending on d). Return 1 if the region
+ * at (x,y) will fit in that gap, or 0 otherwise. */
+static int move_couldfit(game_state *state, int num, int d, int x, int y)
+{
+ int n, gap, i = y*state->w+x, sz;
+
+ assert(d != 0);
+ /* The 'gap' is the number of missing numbers in the grid between
+ * our number and the next one in the sequence (up or down), or
+ * the end of the sequence (if we happen not to have 1/n present) */
+ for (n = num + d, gap = 0;
+ ISREALNUM(state, n) && state->numsi[n] == -1;
+ n += d, gap++) ; /* empty loop */
+
+ if (gap == 0) {
+ /* no gap, so the only allowable move is that that directly
+ * links the two numbers. */
+ n = state->nums[i];
+ return (n == num+d) ? 0 : 1;
+ }
+ if (state->prev[i] == -1 && state->next[i] == -1)
+ return 1; /* single unconnected square, always OK */
+
+ sz = dsf_size(state->dsf, i);
+ return (sz > gap) ? 0 : 1;
+}
+
+static int isvalidmove(game_state *state, int clever,
+ int fromx, int fromy, int tox, int toy)
+{
+ int w = state->w, from = fromy*w+fromx, to = toy*w+tox;
+ int nfrom, nto;
+
+ if (!INGRID(state, fromx, fromy) || !INGRID(state, tox, toy))
+ return 0;
+
+ /* can only move where we point */
+ if (!ispointing(state, fromx, fromy, tox, toy))
+ return 0;
+
+ nfrom = state->nums[from]; nto = state->nums[to];
+
+ /* can't move _from_ the final number, or _to_ the 1. */
+ if (nfrom == state->n || nto == 1)
+ return 0;
+
+ /* can't create a new connection between cells in the same region
+ * as that would create a loop. */
+ if (dsf_canonify(state->dsf, from) == dsf_canonify(state->dsf, to))
+ return 0;
+
+ /* if both cells are actual numbers, can't drag if we're not
+ * one digit apart. */
+ if (ISREALNUM(state, nfrom) && ISREALNUM(state, nto)) {
+ if (nfrom != nto-1)
+ return 0;
+ } else if (clever && ISREALNUM(state, nfrom)) {
+ if (!move_couldfit(state, nfrom, +1, tox, toy))
+ return 0;
+ } else if (clever && ISREALNUM(state, nto)) {
+ if (!move_couldfit(state, nto, -1, fromx, fromy))
+ return 0;
+ }
+
+ return 1;
+}
+
+static void makelink(game_state *state, int from, int to)
+{
+ if (state->next[from] != -1)
+ state->prev[state->next[from]] = -1;
+ state->next[from] = to;
+
+ if (state->prev[to] != -1)
+ state->next[state->prev[to]] = -1;
+ state->prev[to] = from;
+}
+
+static int game_can_format_as_text_now(game_params *params)
+{
+ if (params->w * params->h >= 100) return 0;
+ return 1;
+}
+
+static char *game_text_format(game_state *state)
+{
+ int len = state->h * 2 * (4*state->w + 1) + state->h + 2;
+ int x, y, i, num, n, set;
+ char *ret, *p;
+
+ p = ret = snewn(len, char);
+
+ for (y = 0; y < state->h; y++) {
+ for (x = 0; x < state->h; x++) {
+ i = y*state->w+x;
+ *p++ = dirstrings[state->dirs[i]][0];
+ *p++ = dirstrings[state->dirs[i]][1];
+ *p++ = (state->flags[i] & FLAG_IMMUTABLE) ? 'I' : ' ';
+ *p++ = ' ';
+ }
+ *p++ = '\n';
+ for (x = 0; x < state->h; x++) {
+ i = y*state->w+x;
+ num = state->nums[i];
+ if (num == 0) {
+ *p++ = ' ';
+ *p++ = ' ';
+ *p++ = ' ';
+ } else {
+ n = num % (state->n+1);
+ set = num / (state->n+1);
+
+ assert(n <= 99); /* two digits only! */
+
+ if (set != 0)
+ *p++ = set+'a'-1;
+
+ *p++ = (n >= 10) ? ('0' + (n/10)) : ' ';
+ *p++ = '0' + (n%10);
+
+ if (set == 0)
+ *p++ = ' ';
+ }
+ *p++ = ' ';
+ }
+ *p++ = '\n';
+ *p++ = '\n';
+ }
+ *p++ = '\0';
+
+ return ret;
+}
+
+static void debug_state(const char *desc, game_state *state)
+{
+#ifdef DEBUGGING
+ char *dbg;
+ if (state->n >= 100) {
+ debug(("[ no game_text_format for this size ]"));
+ return;
+ }
+ dbg = game_text_format(state);
+ debug(("%s\n%s", desc, dbg));
+ sfree(dbg);
+#endif
+}
+
+
+static void strip_nums(game_state *state) {
+ int i;
+ for (i = 0; i < state->n; i++) {
+ if (!(state->flags[i] & FLAG_IMMUTABLE))
+ state->nums[i] = 0;
+ }
+ memset(state->next, -1, state->n*sizeof(int));
+ memset(state->prev, -1, state->n*sizeof(int));
+ memset(state->numsi, -1, (state->n+1)*sizeof(int));
+ dsf_init(state->dsf, state->n);
+}
+
+static int check_nums(game_state *orig, game_state *copy, int only_immutable)
+{
+ int i, ret = 1;
+ assert(copy->n == orig->n);
+ for (i = 0; i < copy->n; i++) {
+ if (only_immutable && !copy->flags[i] & FLAG_IMMUTABLE) continue;
+ assert(copy->nums[i] >= 0);
+ assert(copy->nums[i] <= copy->n);
+ if (copy->nums[i] != orig->nums[i]) {
+ debug(("check_nums: (%d,%d) copy=%d, orig=%d.",
+ i%orig->w, i/orig->w, copy->nums[i], orig->nums[i]));
+ ret = 0;
+ }
+ }
+ return ret;
+}
+
+/* --- Game parameter/presets functions --- */
+
+static game_params *default_params(void)
+{
+ game_params *ret = snew(game_params);
+ ret->w = ret->h = 4;
+ ret->force_corner_start = 1;
+
+ return ret;
+}
+
+static const struct game_params signpost_presets[] = {
+ { 4, 4, 1 },
+ { 4, 4, 0 },
+ { 5, 5, 1 },
+ { 5, 5, 0 },
+ { 6, 6, 1 },
+ { 7, 7, 1 }
+};
+
+static int game_fetch_preset(int i, char **name, game_params **params)
+{
+ game_params *ret;
+ char buf[80];
+
+ if (i < 0 || i >= lenof(signpost_presets))
+ return FALSE;
+
+ ret = default_params();
+ *ret = signpost_presets[i];
+ *params = ret;
+
+ sprintf(buf, "%dx%d%s", ret->w, ret->h,
+ ret->force_corner_start ? "" : ", free ends");
+ *name = dupstr(buf);
+
+ return TRUE;
+}
+
+static void free_params(game_params *params)
+{
+ sfree(params);
+}
+
+static game_params *dup_params(game_params *params)
+{
+ game_params *ret = snew(game_params);
+ *ret = *params; /* structure copy */
+ return ret;
+}
+
+static void decode_params(game_params *ret, char const *string)
+{
+ ret->w = ret->h = atoi(string);
+ while (*string && isdigit((unsigned char)*string)) string++;
+ if (*string == 'x') {
+ string++;
+ ret->h = atoi(string);
+ while (*string && isdigit((unsigned char)*string)) string++;
+ }
+ ret->force_corner_start = 0;
+ if (*string == 'c') {
+ string++;
+ ret->force_corner_start = 1;
+ }
+
+}
+
+static char *encode_params(game_params *params, int full)
+{
+ char data[256];
+
+ if (full)
+ sprintf(data, "%dx%d%s", params->w, params->h,
+ params->force_corner_start ? "c" : "");
+ else
+ sprintf(data, "%dx%d", params->w, params->h);
+
+ return dupstr(data);
+}
+
+static config_item *game_configure(game_params *params)
+{
+ config_item *ret;
+ char buf[80];
+
+ ret = snewn(4, config_item);
+
+ ret[0].name = "Width";
+ ret[0].type = C_STRING;
+ sprintf(buf, "%d", params->w);
+ ret[0].sval = dupstr(buf);
+ ret[0].ival = 0;
+
+ ret[1].name = "Height";
+ ret[1].type = C_STRING;
+ sprintf(buf, "%d", params->h);
+ ret[1].sval = dupstr(buf);
+ ret[1].ival = 0;
+
+ ret[2].name = "Start and end in corners";
+ ret[2].type = C_BOOLEAN;
+ ret[2].sval = NULL;
+ ret[2].ival = params->force_corner_start;
+
+ ret[3].name = NULL;
+ ret[3].type = C_END;
+ ret[3].sval = NULL;
+ ret[3].ival = 0;
+
+ return ret;
+}
+
+static game_params *custom_params(config_item *cfg)
+{
+ game_params *ret = snew(game_params);
+
+ ret->w = atoi(cfg[0].sval);
+ ret->h = atoi(cfg[1].sval);
+ ret->force_corner_start = cfg[2].ival;
+
+ return ret;
+}
+
+static char *validate_params(game_params *params, int full)
+{
+ if (params->w < 2 || params->h < 2)
+ return "Width and height must both be at least two";
+
+ return NULL;
+}
+
+/* --- Game description string generation and unpicking --- */
+
+static void blank_game_into(game_state *state)
+{
+ memset(state->dirs, 0, state->n*sizeof(int));
+ memset(state->nums, 0, state->n*sizeof(int));
+ memset(state->flags, 0, state->n*sizeof(unsigned int));
+ memset(state->next, -1, state->n*sizeof(int));
+ memset(state->prev, -1, state->n*sizeof(int));
+ memset(state->numsi, -1, (state->n+1)*sizeof(int));
+}
+
+static game_state *blank_game(int w, int h)
+{
+ game_state *state = snew(game_state);
+
+ memset(state, 0, sizeof(game_state));
+ state->w = w;
+ state->h = h;
+ state->n = w*h;
+
+ state->dirs = snewn(state->n, int);
+ state->nums = snewn(state->n, int);
+ state->flags = snewn(state->n, unsigned int);
+ state->next = snewn(state->n, int);
+ state->prev = snewn(state->n, int);
+ state->dsf = snew_dsf(state->n);
+ state->numsi = snewn(state->n+1, int);
+
+ blank_game_into(state);
+
+ return state;
+}
+
+static void dup_game_to(game_state *to, game_state *from)
+{
+ to->completed = from->completed;
+ to->used_solve = from->used_solve;
+ to->impossible = from->impossible;
+
+ memcpy(to->dirs, from->dirs, to->n*sizeof(int));
+ memcpy(to->flags, from->flags, to->n*sizeof(unsigned int));
+ memcpy(to->nums, from->nums, to->n*sizeof(int));
+
+ memcpy(to->next, from->next, to->n*sizeof(int));
+ memcpy(to->prev, from->prev, to->n*sizeof(int));
+
+ memcpy(to->dsf, from->dsf, to->n*sizeof(int));
+ memcpy(to->numsi, from->numsi, (to->n+1)*sizeof(int));
+}
+
+static game_state *dup_game(game_state *state)
+{
+ game_state *ret = blank_game(state->w, state->h);
+ dup_game_to(ret, state);
+ return ret;
+}
+
+static void free_game(game_state *state)
+{
+ sfree(state->dirs);
+ sfree(state->nums);
+ sfree(state->flags);
+ sfree(state->next);
+ sfree(state->prev);
+ sfree(state->dsf);
+ sfree(state->numsi);
+ sfree(state);
+}
+
+static void unpick_desc(game_params *params, char *desc,
+ game_state **sout, char **mout)
+{
+ game_state *state = blank_game(params->w, params->h);
+ char *msg = NULL, c;
+ int num = 0, i = 0;
+
+ while (*desc) {
+ if (i >= state->n) {
+ msg = "Game description longer than expected";
+ goto done;
+ }
+
+ c = *desc;
+ if (isdigit(c)) {
+ num = (num*10) + (int)(c-'0');
+ if (num > state->n) {
+ msg = "Number too large";
+ goto done;
+ }
+ } else if ((c-'a') >= 0 && (c-'a') < DIR_MAX) {
+ state->nums[i] = num;
+ state->flags[i] = num ? FLAG_IMMUTABLE : 0;
+ num = 0;
+
+ state->dirs[i] = c - 'a';
+ i++;
+ } else if (!*desc) {
+ msg = "Game description shorter than expected";
+ goto done;
+ } else {
+ msg = "Game description contains unexpected characters";
+ goto done;
+ }
+ desc++;
+ }
+ if (i < state->n) {
+ msg = "Game description shorter than expected";
+ goto done;
+ }
+
+done:
+ if (msg) { /* sth went wrong. */
+ if (mout) *mout = msg;
+ free_game(state);
+ } else {
+ if (mout) *mout = NULL;
+ if (sout) *sout = state;
+ else free_game(state);
+ }
+}
+
+static char *generate_desc(game_state *state, int issolve)
+{
+ char *ret, buf[80];
+ int retlen, i, k;
+
+ ret = NULL; retlen = 0;
+ if (issolve) {
+ ret = sresize(ret, 2, char);
+ ret[0] = 'S'; ret[1] = '\0';
+ retlen += 1;
+ }
+ for (i = 0; i < state->n; i++) {
+ if (state->nums[i])
+ k = sprintf(buf, "%d%c", state->nums[i], (int)(state->dirs[i]+'a'));
+ else
+ k = sprintf(buf, "%c", (int)(state->dirs[i]+'a'));
+ ret = sresize(ret, retlen + k + 1, char);
+ strcpy(ret + retlen, buf);
+ retlen += k;
+ }
+ return ret;
+}
+
+/* --- Game generation --- */
+
+/* Fills in preallocated arrays ai (indices) and ad (directions)
+ * showing all non-numbered cells adjacent to index i, returns length */
+/* This function has been somewhat optimised... */
+static int cell_adj(game_state *state, int i, int *ai, int *ad)
+{
+ int n = 0, a, x, y, sx, sy, dx, dy, newi;
+ int w = state->w, h = state->h;
+
+ sx = i % w; sy = i / w;
+
+ for (a = 0; a < DIR_MAX; a++) {
+ x = sx; y = sy;
+ dx = dxs[a]; dy = dys[a];
+ while (1) {
+ x += dx; y += dy;
+ if (x < 0 || y < 0 || x >= w || y >= h) break;
+
+ newi = y*w + x;
+ if (state->nums[newi] == 0) {
+ ai[n] = newi;
+ ad[n] = a;
+ n++;
+ }
+ }
+ }
+ return n;
+}
+
+static int new_game_fill(game_state *state, random_state *rs,
+ int headi, int taili)
+{
+ int nfilled, an, ret = 0, j;
+ int *aidx, *adir;
+
+ aidx = snewn(state->n, int);
+ adir = snewn(state->n, int);
+
+ debug(("new_game_fill: headi=%d, taili=%d.", headi, taili));
+
+ memset(state->nums, 0, state->n*sizeof(int));
+
+ state->nums[headi] = 1;
+ state->nums[taili] = state->n;
+
+ state->dirs[taili] = 0;
+ nfilled = 2;
+
+ while (nfilled < state->n) {
+ /* Try and expand _from_ headi; keep going if there's only one
+ * place to go to. */
+ an = cell_adj(state, headi, aidx, adir);
+ do {
+ if (an == 0) goto done;
+ j = random_upto(rs, an);
+ state->dirs[headi] = adir[j];
+ state->nums[aidx[j]] = state->nums[headi] + 1;
+ nfilled++;
+ headi = aidx[j];
+ an = cell_adj(state, headi, aidx, adir);
+ } while (an == 1);
+
+ /* Try and expand _to_ taili; keep going if there's only one
+ * place to go to. */
+ an = cell_adj(state, taili, aidx, adir);
+ do {
+ if (an == 0) goto done;
+ j = random_upto(rs, an);
+ state->dirs[aidx[j]] = DIR_OPPOSITE(adir[j]);
+ state->nums[aidx[j]] = state->nums[taili] - 1;
+ nfilled++;
+ taili = aidx[j];
+ an = cell_adj(state, taili, aidx, adir);
+ } while (an == 1);
+ }
+ /* If we get here we have headi and taili set but unconnected
+ * by direction: we need to set headi's direction so as to point
+ * at taili. */
+ state->dirs[headi] = whichdiri(state, headi, taili);
+
+ /* it could happen that our last two weren't in line; if that's the
+ * case, we have to start again. */
+ if (state->dirs[headi] != -1) ret = 1;
+
+done:
+ sfree(aidx);
+ sfree(adir);
+ return ret;
+}
+
+/* Better generator: with the 'generate, sprinkle numbers, solve,
+ * repeat' algorithm we're _never_ generating anything greater than
+ * 6x6, and spending all of our time in new_game_fill (and very little
+ * in solve_state).
+ *
+ * So, new generator steps:
+ * generate the grid, at random (same as now). Numbers 1 and N get
+ immutable flag immediately.
+ * squirrel that away for the solved state.
+ *
+ * (solve:) Try and solve it.
+ * If we solved it, we're done:
+ * generate the description from current immutable numbers,
+ * free stuff that needs freeing,
+ * return description + solved state.
+ * If we didn't solve it:
+ * count #tiles in state we've made deductions about.
+ * while (1):
+ * randomise a scratch array.
+ * for each index in scratch (in turn):
+ * if the cell isn't empty, continue (through scratch array)
+ * set number + immutable in state.
+ * try and solve state.
+ * if we've solved it, we're done.
+ * otherwise, count #tiles. If it's more than we had before:
+ * good, break from this loop and re-randomise.
+ * otherwise (number didn't help):
+ * remove number and try next in scratch array.
+ * if we've got to the end of the scratch array, no luck:
+ free everything we need to, and go back to regenerate the grid.
+ */
+
+static int solve_state(game_state *state);
+
+static void debug_desc(const char *what, game_state *state)
+{
+#if DEBUGGING
+ {
+ char *desc = generate_desc(state, 0);
+ debug(("%s game state: %dx%d:%s", what, state->w, state->h, desc));
+ sfree(desc);
+ }
+#endif
+}
+
+/* Expects a fully-numbered game_state on input, and makes sure
+ * FLAG_IMMUTABLE is only set on those numbers we need to solve
+ * (as for a real new-game); returns 1 if it managed
+ * this (such that it could solve it), or 0 if not. */
+static int new_game_strip(game_state *state, random_state *rs)
+{
+ int *scratch, i, j, ret = 1;
+ game_state *copy = dup_game(state);
+
+ debug(("new_game_strip."));
+
+ strip_nums(copy);
+ debug_desc("Stripped", copy);
+
+ if (solve_state(copy) > 0) {
+ debug(("new_game_strip: soluble immediately after strip."));
+ free_game(copy);
+ return 1;
+ }
+
+ scratch = snewn(state->n, int);
+ for (i = 0; i < state->n; i++) scratch[i] = i;
+ shuffle(scratch, state->n, sizeof(int), rs);
+
+ /* This is scungy. It might just be quick enough.
+ * It goes through, adding set numbers in empty squares
+ * until either we run out of empty squares (in the one
+ * we're half-solving) or else we solve it properly.
+ * NB that we run the entire solver each time, which
+ * strips the grid beforehand; we will save time if we
+ * avoid that. */
+ for (i = 0; i < state->n; i++) {
+ j = scratch[i];
+ if (copy->nums[j] > 0 && copy->nums[j] <= state->n)
+ continue; /* already solved to a real number here. */
+ assert(state->nums[j] <= state->n);
+ debug(("new_game_strip: testing add IMMUTABLE number %d at square (%d,%d).",
+ state->nums[j], j%state->w, j/state->w));
+ copy->nums[j] = state->nums[j];
+ copy->flags[j] |= FLAG_IMMUTABLE;
+ state->flags[j] |= FLAG_IMMUTABLE;
+ debug_state("Copy of state: ", copy);
+ if (solve_state(copy) > 0) goto solved;
+ assert(check_nums(state, copy, 1));
+ }
+ ret = 0;
+ goto done;
+
+solved:
+ debug(("new_game_strip: now solved."));
+ /* Since we added basically at random, try now to remove numbers
+ * and see if we can still solve it; if we can (still), really
+ * remove the number. Make sure we don't remove the anchor numbers
+ * 1 and N. */
+ for (i = 0; i < state->n; i++) {
+ j = scratch[i];
+ if ((state->flags[j] & FLAG_IMMUTABLE) &&
+ (state->nums[j] != 1 && state->nums[j] != state->n)) {
+ debug(("new_game_strip: testing remove IMMUTABLE number %d at square (%d,%d).",
+ state->nums[j], j%state->w, j/state->w));
+ state->flags[j] &= ~FLAG_IMMUTABLE;
+ dup_game_to(copy, state);
+ strip_nums(copy);
+ if (solve_state(copy) > 0) {
+ assert(check_nums(state, copy, 0));
+ debug(("new_game_strip: OK, removing number"));
+ } else {
+ assert(state->nums[j] <= state->n);
+ debug(("new_game_strip: cannot solve, putting IMMUTABLE back."));
+ copy->nums[j] = state->nums[j];
+ state->flags[j] |= FLAG_IMMUTABLE;
+ }
+ }
+ }
+
+done:
+ debug(("new_game_strip: %ssuccessful.", ret ? "" : "not "));
+ sfree(scratch);
+ free_game(copy);
+ return ret;
+}
+
+static char *new_game_desc(game_params *params, random_state *rs,
+ char **aux, int interactive)
+{
+ game_state *state = blank_game(params->w, params->h);
+ char *ret;
+ int headi, taili;
+
+generate:
+ blank_game_into(state);
+
+ /* keep trying until we fill successfully. */
+ do {
+ if (params->force_corner_start) {
+ headi = 0;
+ taili = state->n-1;
+ } else {
+ do {
+ headi = random_upto(rs, state->n);
+ taili = random_upto(rs, state->n);
+ } while (headi == taili);
+ }
+ } while (!new_game_fill(state, rs, headi, taili));
+
+ debug_state("Filled game:", state);
+
+ assert(state->nums[headi] <= state->n);
+ assert(state->nums[taili] <= state->n);
+
+ state->flags[headi] |= FLAG_IMMUTABLE;
+ state->flags[taili] |= FLAG_IMMUTABLE;
+
+ /* This will have filled in directions and _all_ numbers.
+ * Store the game definition for this, as the solved-state. */
+ if (!new_game_strip(state, rs)) {
+ goto generate;
+ }
+ strip_nums(state);
+ {
+ game_state *tosolve = dup_game(state);
+ assert(solve_state(tosolve) > 0);
+ free_game(tosolve);
+ }
+ ret = generate_desc(state, 0);
+ free_game(state);
+ return ret;
+}
+
+static char *validate_desc(game_params *params, char *desc)
+{
+ char *ret = NULL;
+
+ unpick_desc(params, desc, NULL, &ret);
+ return ret;
+}
+
+/* --- Linked-list and numbers array --- */
+
+/* Assuming numbers are always up-to-date, there are only four possibilities
+ * for regions changing:
+ *
+ * 1) two differently-coloured regions being combined (the resulting colouring
+ * should be based on the larger of the two regions)
+ * 2) a numbered region having a single number added to the start (the
+ * region's colour will remain, and the numbers will shift by 1)
+ * 3) a numbered region having a single number added to the end (the
+ * region's colour and numbering remains as-is)
+ * 4) two unnumbered squares being joined (will pick the smallest unused set
+ * of colours to use for the new region).
+ *
+ * There should never be any complications with regions containing 3 colours
+ * being combined, since two of those colours should have been merged on a
+ * previous move.
+ */
+
+/* New algorithm for working out numbering:
+ *
+ * At start, only remove numbers from cells with neither prev nor next.
+ * Search for all cells with !prev && next (head of chain); for each one:
+ * Search the group for a 'real' number: if we find one the num. for
+ the head of the chain is trivial.
+ * Otherwise, if we _don't_ have a number already:
+ * If head->next has a number, that number is the one we should use
+ * Otherwise pick the smallest unused colour set.
+ * and if we _do_ have a number already:
+ * Work out the size of this group (the dsf must already have been set up)
+ * Start enumerating through the group counting squares that have the
+ same colouring as us
+ * If we reach a square with a different colour, work out which set is
+ bigger (ncol1 vs ncol2 == sz-ncol1), and use that colour
+ * If we reached a square with no colour (or the end of the group, which
+ would be weird under the circumstances) just keep the existing colour.
+ */
+
+#define COLOUR(a) ((a) / (state->n+1))
+#define START(c) ((c) * (state->n+1))
+
+static int lowest_start(game_state *state, int *scratch)
+{
+ int i, c;
+
+ /* Fill in 'scratch' array with the currently-used colours... */
+ memset(scratch, 0, state->n * sizeof(int));
+ for (i = 0; i < state->n; i++) {
+ if (state->nums[i] != 0)
+ scratch[COLOUR(state->nums[i])] = 1;
+ }
+ /* ... and return the first one that was unused. */
+ for (c = 1; c < state->n; c++) { /* NB start at 1 */
+ if (scratch[c] == 0)
+ return START(c);
+ }
+ assert(!"shouldn't get here");
+ return -1; /* suyb */
+}
+
+static int used_colour(game_state *state, int i, int start)
+{
+ int j;
+ for (j = 0; j < i; j++) {
+ if (state->nums[j] == start)
+ return 1;
+ }
+ return 0;
+}
+
+static int head_number(game_state *state, int i, int *scratch)
+{
+ int off = 0, start = -1, ss, j = i, c, n, sz;
+ const char *why = NULL;
+
+ assert(state->prev[i] == -1 && state->next[i] != -1);
+
+ /* Search through this chain looking for real numbers, checking that
+ * they match up (if there are more than one). */
+ while (j != -1) {
+ if (state->flags[j] & FLAG_IMMUTABLE) {
+ ss = state->nums[j] - off;
+ if (start == -1) {
+ start = ss;
+ why = "contains cell with immutable number";
+ } else if (start != ss) {
+ debug(("head_number: chain with non-sequential numbers."));
+ state->impossible = 1;
+ }
+ }
+ off++;
+ j = state->next[j];
+ assert(j != i); /* we have created a loop, obviously wrong */
+ }
+ if (start != -1) goto found;
+
+ if (state->nums[i] == 0) {
+ if (state->nums[state->next[i]] != 0) {
+ /* make sure we start at a 0 offset. */
+ start = START(COLOUR(state->nums[state->next[i]]));
+ why = "adding blank cell to head of numbered region";
+ } else {
+ start = lowest_start(state, scratch);
+ why = "lowest available colour group";
+ }
+ } else {
+ c = COLOUR(state->nums[i]);
+ n = 1;
+ sz = dsf_size(state->dsf, i);
+ j = i;
+ while (state->next[j] != -1) {
+ j = state->next[j];
+ if (state->nums[j] == 0) {
+ start = START(c);
+ why = "adding blank cell to end of numbered region";
+ break;
+ }
+ if (COLOUR(state->nums[j]) == c)
+ n++;
+ else {
+ int start_alternate = START(COLOUR(state->nums[j]));
+ if (n < (sz - n) && !used_colour(state, i, start_alternate)) {
+ start = start_alternate;
+ why = "joining two coloured regions, swapping to larger colour";
+ } else {
+ start = START(c);
+ why = "joining two coloured regions, taking largest";
+ }
+ break;
+ }
+ }
+ /* If we got here then we may have split a region into
+ * two; make sure we don't assign a colour we've already used. */
+ if (start == -1) {
+ start = (c == 0) ? lowest_start(state, scratch) : START(c);
+ why = "got to end of coloured region";
+ }
+ if (used_colour(state, i, start)) {
+ start = lowest_start(state, scratch);
+ why = "split region in two, lowest available colour group";
+ }
+ }
+
+found:
+ assert(start != -1 && why != NULL);
+ debug(("Chain at (%d,%d) numbered at %d: %s.",
+ i%state->w, i/state->w, start, why));
+ return start;
+}
+
+#if 0
+static void debug_numbers(game_state *state)
+{
+ int i, w=state->w;
+
+ for (i = 0; i < state->n; i++) {
+ debug(("(%d,%d) --> (%d,%d) --> (%d,%d)",
+ state->prev[i]==-1 ? -1 : state->prev[i]%w,
+ state->prev[i]==-1 ? -1 : state->prev[i]/w,
+ i%w, i/w,
+ state->next[i]==-1 ? -1 : state->next[i]%w,
+ state->next[i]==-1 ? -1 : state->next[i]/w));
+ }
+ w = w+1;
+}
+#endif
+
+static void connect_numbers(game_state *state)
+{
+ int i, di, dni;
+
+ dsf_init(state->dsf, state->n);
+ for (i = 0; i < state->n; i++) {
+ if (state->next[i] != -1) {
+ assert(state->prev[state->next[i]] == i);
+ di = dsf_canonify(state->dsf, i);
+ dni = dsf_canonify(state->dsf, state->next[i]);
+ if (di == dni) {
+ debug(("connect_numbers: chain forms a loop."));
+ state->impossible = 1;
+ }
+ dsf_merge(state->dsf, di, dni);
+ }
+ }
+}
+
+static void update_numbers(game_state *state)
+{
+ int i, j, nnum;
+ int *scratch = snewn(state->n, int);
+
+ for (i = 0; i < state->n; i++) {
+ assert(state->nums[i] >= 0);
+ state->numsi[i] = -1;
+ }
+
+ for (i = 0; i < state->n; i++) {
+ if (state->flags[i] & FLAG_IMMUTABLE) {
+ assert(state->nums[i] >= 0);
+ assert(state->nums[i] <= state->n);
+ state->numsi[state->nums[i]] = i;
+ }
+ else if (state->prev[i] == -1 && state->next[i] == -1)
+ state->nums[i] = 0;
+ }
+ connect_numbers(state);
+
+ for (i = 0; i < state->n; i++) {
+ /* Look for a cell that is the start of a chain
+ * (has a next but no prev). */
+ if (state->prev[i] != -1 || state->next[i] == -1) continue;
+
+ nnum = head_number(state, i, scratch);
+ j = i;
+ while (j != -1) {
+ if (nnum > 0 && nnum <= state->n)
+ state->numsi[nnum] = j;
+ state->nums[j] = nnum++;
+ j = state->next[j];
+ assert(j != i); /* loop?! */
+ }
+ }
+ /*debug_numbers(state);*/
+ sfree(scratch);
+}
+
+static int check_completion(game_state *state, int mark_errors)
+{
+ int n, j, k, error = 0, complete;
+
+ /* NB This only marks errors that are possible to perpetrate with
+ * the current UI in interpret_move. Things like forming loops in
+ * linked sections and having numbers not add up should be forbidden
+ * by the code elsewhere, so we don't bother marking those (because
+ * it would add lots of tricky drawing code for very little gain). */
+ if (mark_errors) {
+ for (j = 0; j < state->n; j++)
+ state->flags[j] &= ~FLAG_ERROR;
+ }
+
+ /* Search for repeated numbers. */
+ for (j = 0; j < state->n; j++) {
+ if (state->nums[j] > 0 && state->nums[j] <= state->n) {
+ for (k = j+1; k < state->n; k++) {
+ if (state->nums[k] == state->nums[j]) {
+ if (mark_errors) {
+ state->flags[j] |= FLAG_ERROR;
+ state->flags[k] |= FLAG_ERROR;
+ }
+ error = 1;
+ }
+ }
+ }
+ }
+
+ /* Search and mark numbers n not pointing to n+1; if any numbers
+ * are missing we know we've not completed. */
+ complete = 1;
+ for (n = 1; n < state->n; n++) {
+ if (state->numsi[n] == -1 || state->numsi[n+1] == -1)
+ complete = 0;
+ else if (!ispointingi(state, state->numsi[n], state->numsi[n+1])) {
+ if (mark_errors) {
+ state->flags[state->numsi[n]] |= FLAG_ERROR;
+ state->flags[state->numsi[n+1]] |= FLAG_ERROR;
+ }
+ error = 1;
+ } else {
+ /* make sure the link is explicitly made here; for instance, this
+ * is nice if the user drags from 2 out (making 3) and a 4 is also
+ * visible; this ensures that the link from 3 to 4 is also made. */
+ if (mark_errors)
+ makelink(state, state->numsi[n], state->numsi[n+1]);
+ }
+ }
+
+ if (error) return 0;
+ return complete;
+}
+static game_state *new_game(midend *me, game_params *params, char *desc)
+{
+ game_state *state = NULL;
+
+ unpick_desc(params, desc, &state, NULL);
+ if (!state) assert(!"new_game failed to unpick");
+
+ update_numbers(state);
+ check_completion(state, 1); /* update any auto-links */
+
+ return state;
+}
+
+/* --- Solver --- */
+
+/* If a tile has a single tile it can link _to_, or there's only a single
+ * location that can link to a given tile, fill that link in. */
+static int solve_single(game_state *state, game_state *copy, int *from)
+{
+ int i, j, sx, sy, x, y, d, poss, w=state->w, nlinks = 0;
+
+ /* The from array is a list of 'which square can link _to_ us';
+ * we start off with from as '-1' (meaning 'not found'); if we find
+ * something that can link to us it is set to that index, and then if
+ * we find another we set it to -2. */
+
+ memset(from, -1, state->n*sizeof(int));
+
+ /* poss is 'can I link to anything' with the same meanings. */
+
+ for (i = 0; i < state->n; i++) {
+ if (state->next[i] != -1) continue;
+ if (state->nums[i] == state->n) continue; /* no next from last no. */
+
+ d = state->dirs[i];
+ poss = -1;
+ sx = x = i%w; sy = y = i/w;
+ while (1) {
+ x += dxs[d]; y += dys[d];
+ if (!INGRID(state, x, y)) break;
+ if (!isvalidmove(state, 1, sx, sy, x, y)) continue;
+
+ /* can't link to somewhere with a back-link we would have to
+ * break (the solver just doesn't work like this). */
+ j = y*w+x;
+ if (state->prev[j] != -1) continue;
+
+ if (state->nums[i] > 0 && state->nums[j] > 0 &&
+ state->nums[i] <= state->n && state->nums[j] <= state->n &&
+ state->nums[j] == state->nums[i]+1) {
+ debug(("Solver: forcing link through existing consecutive numbers."));
+ poss = j;
+ from[j] = i;
+ break;
+ }
+
+ /* if there's been a valid move already, we have to move on;
+ * we can't make any deductions here. */
+ poss = (poss == -1) ? j : -2;
+
+ /* Modify the from array as described above (which is enumerating
+ * what points to 'j' in a similar way). */
+ from[j] = (from[j] == -1) ? i : -2;
+ }
+ if (poss == -2) {
+ /*debug(("Solver: (%d,%d) has multiple possible next squares.", sx, sy));*/
+ ;
+ } else if (poss == -1) {
+ debug(("Solver: nowhere possible for (%d,%d) to link to.", sx, sy));
+ copy->impossible = 1;
+ return -1;
+ } else {
+ debug(("Solver: linking (%d,%d) to only possible next (%d,%d).",
+ sx, sy, poss%w, poss/w));
+ makelink(copy, i, poss);
+ nlinks++;
+ }
+ }
+
+ for (i = 0; i < state->n; i++) {
+ if (state->prev[i] != -1) continue;
+ if (state->nums[i] == 1) continue; /* no prev from 1st no. */
+
+ x = i%w; y = i/w;
+ if (from[i] == -1) {
+ debug(("Solver: nowhere possible to link to (%d,%d)", x, y));
+ copy->impossible = 1;
+ return -1;
+ } else if (from[i] == -2) {
+ /*debug(("Solver: (%d,%d) has multiple possible prev squares.", x, y));*/
+ ;
+ } else {
+ debug(("Solver: linking only possible prev (%d,%d) to (%d,%d).",
+ from[i]%w, from[i]/w, x, y));
+ makelink(copy, from[i], i);
+ nlinks++;
+ }
+ }
+
+ return nlinks;
+}
+
+/* Returns 1 if we managed to solve it, 0 otherwise. */
+static int solve_state(game_state *state)
+{
+ game_state *copy = dup_game(state);
+ int *scratch = snewn(state->n, int), ret;
+
+ debug_state("Before solver: ", state);
+
+ while (1) {
+ update_numbers(state);
+
+ if (solve_single(state, copy, scratch)) {
+ dup_game_to(state, copy);
+ if (state->impossible) break; else continue;
+ }
+ break;
+ }
+ free_game(copy);
+ sfree(scratch);
+
+ update_numbers(state);
+ ret = state->impossible ? -1 : check_completion(state, 0);
+ debug(("Solver finished: %s",
+ ret < 0 ? "impossible" : ret > 0 ? "solved" : "not solved"));
+ debug_state("After solver: ", state);
+ return ret;
+}
+
+static char *solve_game(game_state *state, game_state *currstate,
+ char *aux, char **error)
+{
+ game_state *tosolve;
+ char *ret = NULL;
+ int result;
+
+ tosolve = dup_game(currstate);
+ result = solve_state(tosolve);
+ if (result > 0)
+ ret = generate_desc(tosolve, 1);
+ free_game(tosolve);
+ if (ret) return ret;
+
+ tosolve = dup_game(state);
+ result = solve_state(tosolve);
+ if (result < 0)
+ *error = "Puzzle is impossible.";
+ else if (result == 0)
+ *error = "Unable to solve puzzle.";
+ else
+ ret = generate_desc(tosolve, 1);
+
+ free_game(tosolve);
+
+ return ret;
+}
+
+/* --- UI and move routines. --- */
+
+
+struct game_ui {
+ int cx, cy, cshow;
+
+ int dragging, drag_is_from;
+ int sx, sy; /* grid coords of start cell */
+ int dx, dy; /* pixel coords of drag posn */
+};
+
+static game_ui *new_ui(game_state *state)
+{
+ game_ui *ui = snew(game_ui);
+
+ /* NB: if this is ever changed to as to require more than a structure
+ * copy to clone, there's code that needs fixing in game_redraw too. */
+
+ ui->cx = ui->cy = ui->cshow = 0;
+
+ ui->dragging = 0;
+ ui->sx = ui->sy = ui->dx = ui->dy = 0;
+
+ return ui;
+}
+
+static void free_ui(game_ui *ui)
+{
+ sfree(ui);
+}
+
+static char *encode_ui(game_ui *ui)
+{
+ return NULL;
+}
+
+static void decode_ui(game_ui *ui, char *encoding)
+{
+}
+
+static void game_changed_state(game_ui *ui, game_state *oldstate,
+ game_state *newstate)
+{
+ if (!oldstate->completed && newstate->completed)
+ ui->cshow = ui->dragging = 0;
+}
+
+struct game_drawstate {
+ int tilesize, started, solved;
+ int w, h, n;
+ int *nums, *dirp;
+ unsigned int *f;
+ double angle_offset;
+
+ int dragging, dx, dy;
+ blitter *dragb;
+};
+
+static char *interpret_move(game_state *state, game_ui *ui, game_drawstate *ds,
+ int mx, int my, int button)
+{
+ int x = FROMCOORD(mx), y = FROMCOORD(my), w = state->w;
+ char buf[80];
+
+ if (IS_CURSOR_MOVE(button)) {
+ move_cursor(button, &ui->cx, &ui->cy, state->w, state->h, 0);
+ ui->cshow = 1;
+ if (ui->dragging) {
+ ui->dx = COORD(ui->cx) + TILE_SIZE/2;
+ ui->dy = COORD(ui->cy) + TILE_SIZE/2;
+ }
+ return "";
+ } else if (IS_CURSOR_SELECT(button)) {
+ if (!ui->cshow)
+ ui->cshow = 1;
+ else if (ui->dragging) {
+ ui->dragging = FALSE;
+ if (ui->sx == ui->cx && ui->sy == ui->cy) return "";
+ if (ui->drag_is_from) {
+ if (!isvalidmove(state, 0, ui->sx, ui->sy, ui->cx, ui->cy)) return "";
+ sprintf(buf, "L%d,%d-%d,%d", ui->sx, ui->sy, ui->cx, ui->cy);
+ } else {
+ if (!isvalidmove(state, 0, ui->cx, ui->cy, ui->sx, ui->sy)) return "";
+ sprintf(buf, "L%d,%d-%d,%d", ui->cx, ui->cy, ui->sx, ui->sy);
+ }
+ return dupstr(buf);
+ } else {
+ ui->dragging = TRUE;
+ ui->sx = ui->cx;
+ ui->sy = ui->cy;
+ ui->dx = COORD(ui->cx) + TILE_SIZE/2;
+ ui->dy = COORD(ui->cy) + TILE_SIZE/2;
+ ui->drag_is_from = (button == CURSOR_SELECT) ? 1 : 0;
+ }
+ return "";
+ }
+ if (IS_MOUSE_DOWN(button)) {
+ if (ui->cshow) {
+ ui->cshow = ui->dragging = 0;
+ }
+ assert(!ui->dragging);
+ if (!INGRID(state, x, y)) return NULL;
+
+ if (button == LEFT_BUTTON) {
+ /* disallow dragging from the final number. */
+ if (state->nums[y*w+x] == state->n) return NULL;
+ } else if (button == RIGHT_BUTTON) {
+ /* disallow dragging to the first number. */
+ if (state->nums[y*w+x] == 1) return NULL;
+ }
+
+ ui->dragging = TRUE;
+ ui->drag_is_from = (button == LEFT_BUTTON) ? 1 : 0;
+ ui->sx = x;
+ ui->sy = y;
+ ui->dx = mx;
+ ui->dy = my;
+ ui->cshow = 0;
+ return "";
+ } else if (IS_MOUSE_DRAG(button) && ui->dragging) {
+ ui->dx = mx;
+ ui->dy = my;
+ return "";
+ } else if (IS_MOUSE_RELEASE(button) && ui->dragging) {
+ ui->dragging = FALSE;
+ if (ui->sx == x && ui->sy == y) return ""; /* single click */
+
+ if (!INGRID(state, x, y)) {
+ int si = ui->sy*w+ui->sx;
+ if (state->prev[si] == -1 && state->next[si] == -1)
+ return "";
+ sprintf(buf, "%c%d,%d",
+ ui->drag_is_from ? 'C' : 'X', ui->sx, ui->sy);
+ return dupstr(buf);
+ }
+
+ if (ui->drag_is_from) {
+ if (!isvalidmove(state, 0, ui->sx, ui->sy, x, y)) return "";
+ sprintf(buf, "L%d,%d-%d,%d", ui->sx, ui->sy, x, y);
+ } else {
+ if (!isvalidmove(state, 0, x, y, ui->sx, ui->sy)) return "";
+ sprintf(buf, "L%d,%d-%d,%d", x, y, ui->sx, ui->sy);
+ }
+ return dupstr(buf);
+ } /* else if (button == 'H' || button == 'h')
+ return dupstr("H"); */
+ else if ((button == 'x' || button == 'X') && ui->cshow) {
+ int si = ui->cy*w + ui->cx;
+ if (state->prev[si] == -1 && state->next[si] == -1)
+ return "";
+ sprintf(buf, "%c%d,%d",
+ (button == 'x') ? 'C' : 'X', ui->cx, ui->cy);
+ return dupstr(buf);
+ }
+
+ return NULL;
+}
+
+static void unlink_cell(game_state *state, int si)
+{
+ debug(("Unlinking (%d,%d).", si%state->w, si/state->w));
+ if (state->prev[si] != -1) {
+ debug((" ... removing prev link from (%d,%d).",
+ state->prev[si]%state->w, state->prev[si]/state->w));
+ state->next[state->prev[si]] = -1;
+ state->prev[si] = -1;
+ }
+ if (state->next[si] != -1) {
+ debug((" ... removing next link to (%d,%d).",
+ state->next[si]%state->w, state->next[si]/state->w));
+ state->prev[state->next[si]] = -1;
+ state->next[si] = -1;
+ }
+}
+
+static game_state *execute_move(game_state *state, char *move)
+{
+ game_state *ret = NULL;
+ int sx, sy, ex, ey, si, ei, w = state->w;
+ char c;
+
+ debug(("move: %s", move));
+
+ if (move[0] == 'S') {
+ game_params p;
+ game_state *tmp;
+ char *valid;
+ int i;
+
+ p.w = state->w; p.h = state->h;
+ valid = validate_desc(&p, move+1);
+ if (valid) {
+ debug(("execute_move: move not valid: %s", valid));
+ return NULL;
+ }
+ ret = dup_game(state);
+ tmp = new_game(NULL, &p, move+1);
+ for (i = 0; i < state->n; i++) {
+ ret->prev[i] = tmp->prev[i];
+ ret->next[i] = tmp->next[i];
+ }
+ free_game(tmp);
+ ret->used_solve = 1;
+ } else if (sscanf(move, "L%d,%d-%d,%d", &sx, &sy, &ex, &ey) == 4) {
+ if (!isvalidmove(state, 0, sx, sy, ex, ey)) return NULL;
+
+ ret = dup_game(state);
+
+ si = sy*w+sx; ei = ey*w+ex;
+ makelink(ret, si, ei);
+ } else if (sscanf(move, "%c%d,%d", &c, &sx, &sy) == 3) {
+ if (c != 'C' && c != 'X') return NULL;
+ if (!INGRID(state, sx, sy)) return NULL;
+ si = sy*w+sx;
+ if (state->prev[si] == -1 && state->next[si] == -1)
+ return NULL;
+
+ ret = dup_game(state);
+
+ if (c == 'C') {
+ /* Unlink the single cell we dragged from the board. */
+ unlink_cell(ret, si);
+ } else {
+ int i, set, sset = state->nums[si] / (state->n+1);
+ for (i = 0; i < state->n; i++) {
+ /* Unlink all cells in the same set as the one we dragged
+ * from the board. */
+
+ if (state->nums[i] == 0) continue;
+ set = state->nums[i] / (state->n+1);
+ if (set != sset) continue;
+
+ unlink_cell(ret, i);
+ }
+ }
+ } else if (strcmp(move, "H") == 0) {
+ ret = dup_game(state);
+ solve_state(ret);
+ }
+ if (ret) {
+ update_numbers(ret);
+ if (check_completion(ret, 1)) ret->completed = 1;
+ }
+
+ return ret;
+}
+
+/* ----------------------------------------------------------------------
+ * Drawing routines.
+ */
+
+static void game_compute_size(game_params *params, int tilesize,
+ int *x, int *y)
+{
+ /* Ick: fake up `ds->tilesize' for macro expansion purposes */
+ struct { int tilesize, order; } ads, *ds = &ads;
+ ads.tilesize = tilesize;
+
+ *x = TILE_SIZE * params->w + 2 * BORDER;
+ *y = TILE_SIZE * params->h + 2 * BORDER;
+}
+
+static void game_set_size(drawing *dr, game_drawstate *ds,
+ game_params *params, int tilesize)
+{
+ ds->tilesize = tilesize;
+ assert(TILE_SIZE > 0);
+
+ assert(!ds->dragb);
+ ds->dragb = blitter_new(dr, BLITTER_SIZE, BLITTER_SIZE);
+}
+
+/* Colours chosen from the webby palette to work as a background to black text,
+ * W then some plausible approximation to pastelly ROYGBIV; we then interpolate
+ * between consecutive pairs to give another 8 (and then the drawing routine
+ * will reuse backgrounds). */
+static const unsigned long bgcols[8] = {
+ 0xffffff, /* white */
+ 0xffa07a, /* lightsalmon */
+ 0x98fb98, /* green */
+ 0x7fffd4, /* aquamarine */
+ 0x9370db, /* medium purple */
+ 0xffa500, /* orange */
+ 0x87cefa, /* lightskyblue */
+ 0xffff00, /* yellow */
+};
+
+static float *game_colours(frontend *fe, int *ncolours)
+{
+ float *ret = snewn(3 * NCOLOURS, float);
+ int c, i;
+
+ game_mkhighlight(fe, ret, COL_BACKGROUND, COL_HIGHLIGHT, COL_LOWLIGHT);
+
+ for (i = 0; i < 3; i++) {
+ ret[COL_NUMBER * 3 + i] = 0.0F;
+ ret[COL_ARROW * 3 + i] = 0.0F;
+ ret[COL_CURSOR * 3 + i] = ret[COL_BACKGROUND * 3 + i] / 2.0F;
+ ret[COL_GRID * 3 + i] = ret[COL_BACKGROUND * 3 + i] / 1.3F;
+ }
+ ret[COL_NUMBER_SET * 3 + 0] = 0.0F;
+ ret[COL_NUMBER_SET * 3 + 1] = 0.0F;
+ ret[COL_NUMBER_SET * 3 + 2] = 0.9F;
+
+ ret[COL_ERROR * 3 + 0] = 1.0F;
+ ret[COL_ERROR * 3 + 1] = 0.0F;
+ ret[COL_ERROR * 3 + 2] = 0.0F;
+
+ ret[COL_DRAG_ORIGIN * 3 + 0] = 0.2F;
+ ret[COL_DRAG_ORIGIN * 3 + 1] = 1.0F;
+ ret[COL_DRAG_ORIGIN * 3 + 2] = 0.2F;
+
+ for (c = 0; c < 8; c++) {
+ ret[(COL_B0 + c) * 3 + 0] = (float)((bgcols[c] & 0xff0000) >> 16) / 256.0F;
+ ret[(COL_B0 + c) * 3 + 1] = (float)((bgcols[c] & 0xff00) >> 8) / 256.0F;
+ ret[(COL_B0 + c) * 3 + 2] = (float)((bgcols[c] & 0xff)) / 256.0F;
+ }
+ for (c = 0; c < 8; c++) {
+ for (i = 0; i < 3; i++) {
+ ret[(COL_B0 + 8 + c) * 3 + i] =
+ (ret[(COL_B0 + c) * 3 + i] + ret[(COL_B0 + c + 1) * 3 + i]) / 2.0F;
+ }
+ }
+
+#define average(r,a,b,w) do { \
+ for (i = 0; i < 3; i++) \
+ ret[(r)*3+i] = ret[(a)*3+i] + w * (ret[(b)*3+i] - ret[(a)*3+i]); \
+} while (0)
+ average(COL_ARROW_BG_DIM, COL_BACKGROUND, COL_ARROW, 0.1F);
+ average(COL_NUMBER_SET_MID, COL_B0, COL_NUMBER_SET, 0.3F);
+ for (c = 0; c < NBACKGROUNDS; c++) {
+ /* I assume here that COL_ARROW and COL_NUMBER are the same.
+ * Otherwise I'd need two sets of COL_M*. */
+ average(COL_M0 + c, COL_B0 + c, COL_NUMBER, 0.3F);
+ average(COL_D0 + c, COL_B0 + c, COL_NUMBER, 0.1F);
+ average(COL_X0 + c, COL_BACKGROUND, COL_B0 + c, 0.5F);
+ }
+
+ *ncolours = NCOLOURS;
+ return ret;
+}
+
+static game_drawstate *game_new_drawstate(drawing *dr, game_state *state)
+{
+ struct game_drawstate *ds = snew(struct game_drawstate);
+ int i;
+
+ ds->tilesize = ds->started = ds->solved = 0;
+ ds->w = state->w;
+ ds->h = state->h;
+ ds->n = state->n;
+
+ ds->nums = snewn(state->n, int);
+ ds->dirp = snewn(state->n, int);
+ ds->f = snewn(state->n, unsigned int);
+ for (i = 0; i < state->n; i++) {
+ ds->nums[i] = 0;
+ ds->dirp[i] = -1;
+ ds->f[i] = 0;
+ }
+
+ ds->angle_offset = 0.0F;
+
+ ds->dragging = ds->dx = ds->dy = 0;
+ ds->dragb = NULL;
+
+ return ds;
+}
+
+static void game_free_drawstate(drawing *dr, game_drawstate *ds)
+{
+ sfree(ds->nums);
+ sfree(ds->dirp);
+ sfree(ds->f);
+ if (ds->dragb) blitter_free(dr, ds->dragb);
+
+ sfree(ds);
+}
+
+/* cx, cy are top-left corner. sz is the 'radius' of the arrow.
+ * ang is in radians, clockwise from 0 == straight up. */
+static void draw_arrow(drawing *dr, int cx, int cy, int sz, double ang,
+ int cfill, int cout)
+{
+ int coords[14];
+ int xdx, ydx, xdy, ydy, xdx3, xdy3;
+ double s = sin(ang), c = cos(ang);
+
+ xdx3 = (int)(sz * (c/3 + 1) + 0.5) - sz;
+ xdy3 = (int)(sz * (s/3 + 1) + 0.5) - sz;
+ xdx = (int)(sz * (c + 1) + 0.5) - sz;
+ xdy = (int)(sz * (s + 1) + 0.5) - sz;
+ ydx = -xdy;
+ ydy = xdx;
+
+
+ coords[2*0 + 0] = cx - ydx;
+ coords[2*0 + 1] = cy - ydy;
+ coords[2*1 + 0] = cx + xdx;
+ coords[2*1 + 1] = cy + xdy;
+ coords[2*2 + 0] = cx + xdx3;
+ coords[2*2 + 1] = cy + xdy3;
+ coords[2*3 + 0] = cx + xdx3 + ydx;
+ coords[2*3 + 1] = cy + xdy3 + ydy;
+ coords[2*4 + 0] = cx - xdx3 + ydx;
+ coords[2*4 + 1] = cy - xdy3 + ydy;
+ coords[2*5 + 0] = cx - xdx3;
+ coords[2*5 + 1] = cy - xdy3;
+ coords[2*6 + 0] = cx - xdx;
+ coords[2*6 + 1] = cy - xdy;
+
+ draw_polygon(dr, coords, 7, cfill, cout);
+}
+
+static void draw_arrow_dir(drawing *dr, int cx, int cy, int sz, int dir,
+ int cfill, int cout, double angle_offset)
+{
+ double ang = 2.0 * PI * (double)dir / 8.0 + angle_offset;
+ draw_arrow(dr, cx, cy, sz, ang, cfill, cout);
+}
+
+/* cx, cy are centre coordinates.. */
+static void draw_star(drawing *dr, int cx, int cy, int rad, int npoints,
+ int cfill, int cout, double angle_offset)
+{
+ int *coords, n;
+ double a, r;
+
+ assert(npoints > 0);
+
+ coords = snewn(npoints * 2 * 2, int);
+
+ for (n = 0; n < npoints * 2; n++) {
+ a = 2.0 * PI * ((double)n / ((double)npoints * 2.0)) + angle_offset;
+ r = (n % 2) ? (double)rad/2.0 : (double)rad;
+
+ /* We're rotating the point at (0, -r) by a degrees */
+ coords[2*n+0] = cx + (int)( r * sin(a));
+ coords[2*n+1] = cy + (int)(-r * cos(a));
+ }
+ draw_polygon(dr, coords, npoints*2, cfill, cout);
+ sfree(coords);
+}
+
+static int num2col(game_drawstate *ds, int num)
+{
+ int set = num / (ds->n+1);
+
+ if (num <= 0) return COL_BACKGROUND;
+ return COL_B0 + (set % 16);
+}
+
+#define ARROW_HALFSZ (7 * TILE_SIZE / 32)
+
+#define F_CUR 0x001 /* Cursor on this tile. */
+#define F_DRAG_SRC 0x002 /* Tile is source of a drag. */
+#define F_ERROR 0x004 /* Tile marked in error. */
+#define F_IMMUTABLE 0x008 /* Tile (number) is immutable. */
+#define F_ARROW_POINT 0x010 /* Tile points to other tile */
+#define F_ARROW_INPOINT 0x020 /* Other tile points in here. */
+#define F_DIM 0x040 /* Tile is dim */
+
+static void tile_redraw(drawing *dr, game_drawstate *ds, int tx, int ty,
+ int dir, int dirp, int num, unsigned int f,
+ double angle_offset, int print_ink)
+{
+ int cb = TILE_SIZE / 16, textsz;
+ char buf[20];
+ int arrowcol, sarrowcol, setcol, textcol;
+ int n = num % (ds->n+1), set = num / (ds->n+1);
+ int acx, acy, asz;
+
+ /* Calculate colours. */
+
+ if (print_ink >= 0) {
+ /*
+ * We're printing, so just do everything in black.
+ */
+ arrowcol = textcol = print_ink;
+ setcol = sarrowcol = -1; /* placate optimiser */
+ } else {
+
+ setcol = num2col(ds, num);
+
+#define dim(fg,bg) ( \
+ (bg)==COL_BACKGROUND ? COL_ARROW_BG_DIM : \
+ (bg) + COL_D0 - COL_B0 \
+ )
+
+#define mid(fg,bg) ( \
+ (fg)==COL_NUMBER_SET ? COL_NUMBER_SET_MID : \
+ (bg) + COL_M0 - COL_B0 \
+ )
+
+#define dimbg(bg) ( \
+ (bg)==COL_BACKGROUND ? COL_BACKGROUND : \
+ (bg) + COL_X0 - COL_B0 \
+ )
+
+ if (f & F_DRAG_SRC) arrowcol = COL_DRAG_ORIGIN;
+ else if (f & F_DIM) arrowcol = dim(COL_ARROW, setcol);
+ else if (f & F_ARROW_POINT) arrowcol = mid(COL_ARROW, setcol);
+ else arrowcol = COL_ARROW;
+
+ if (f & (F_ERROR)) textcol = COL_ERROR;
+ else {
+ if (f & F_IMMUTABLE) textcol = COL_NUMBER_SET;
+ else textcol = COL_NUMBER;
+
+ if (f & F_DIM) textcol = dim(textcol, setcol);
+ else if (((f & F_ARROW_POINT) || num==ds->n) &&
+ ((f & F_ARROW_INPOINT) || num==1))
+ textcol = mid(textcol, setcol);
+ }
+
+ if (f & F_DIM) sarrowcol = dim(COL_ARROW, setcol);
+ else sarrowcol = COL_ARROW;
+ }
+
+ /* Clear tile background */
+
+ if (print_ink < 0) {
+ draw_rect(dr, tx, ty, TILE_SIZE, TILE_SIZE,
+ (f & F_DIM) ? dimbg(setcol) : setcol);
+ }
+
+ /* Draw large (outwards-pointing) arrow. */
+
+ asz = ARROW_HALFSZ; /* 'radius' of arrow/star. */
+ acx = tx+TILE_SIZE/2+asz; /* centre x */
+ acy = ty+TILE_SIZE/2+asz; /* centre y */
+
+ if (num == ds->n && (f & F_IMMUTABLE))
+ draw_star(dr, acx, acy, asz, 5, arrowcol, arrowcol, angle_offset);
+ else
+ draw_arrow_dir(dr, acx, acy, asz, dir, arrowcol, arrowcol, angle_offset);
+ if (print_ink < 0 && (f & F_CUR))
+ draw_rect_corners(dr, acx, acy, asz+1, COL_CURSOR);
+
+ /* Draw dot iff this tile requires a predecessor and doesn't have one. */
+
+ if (print_ink < 0) {
+ acx = tx+TILE_SIZE/2-asz;
+ acy = ty+TILE_SIZE/2+asz;
+
+ if (!(f & F_ARROW_INPOINT) && num != 1) {
+ draw_circle(dr, acx, acy, asz / 4, sarrowcol, sarrowcol);
+ }
+ }
+
+ /* Draw text (number or set). */
+
+ if (num != 0) {
+ assert(num > 0);
+ if (set == 0) {
+ sprintf(buf, "%d", n);
+ } else {
+ if (n == 0)
+ sprintf(buf, "%c", (int)(set+'a'-1));
+ else
+ sprintf(buf, "%c+%d", (int)(set+'a'-1), n);
+ }
+ textsz = min(2*asz, (TILE_SIZE - 2 * cb) / (int)strlen(buf));
+ draw_text(dr, tx + cb, ty + TILE_SIZE/4, FONT_VARIABLE, textsz,
+ ALIGN_VCENTRE | ALIGN_HLEFT, textcol, buf);
+ }
+
+ if (print_ink < 0) {
+ draw_rect_outline(dr, tx, ty, TILE_SIZE, TILE_SIZE, COL_GRID);
+ draw_update(dr, tx, ty, TILE_SIZE, TILE_SIZE);
+ }
+}
+
+static void draw_drag_indicator(drawing *dr, game_drawstate *ds,
+ game_state *state, game_ui *ui, int validdrag)
+{
+ int dir, w = ds->w, acol = COL_ARROW;
+ int fx = FROMCOORD(ui->dx), fy = FROMCOORD(ui->dy);
+ double ang;
+
+ if (validdrag) {
+ /* If we could move here, lock the arrow to the appropriate direction. */
+ dir = ui->drag_is_from ? state->dirs[ui->sy*w+ui->sx] : state->dirs[fy*w+fx];
+
+ ang = (2.0 * PI * dir) / 8.0; /* similar to calculation in draw_arrow_dir. */
+ } else {
+ /* Draw an arrow pointing away from/towards the origin cell. */
+ int ox = COORD(ui->sx) + TILE_SIZE/2, oy = COORD(ui->sy) + TILE_SIZE/2;
+ double tana, offset;
+ double xdiff = fabs(ox - ui->dx), ydiff = fabs(oy - ui->dy);
+
+ if (xdiff == 0) {
+ ang = (oy > ui->dy) ? 0.0F : PI;
+ } else if (ydiff == 0) {
+ ang = (ox > ui->dx) ? 3.0F*PI/2.0F : PI/2.0F;
+ } else {
+ if (ui->dx > ox && ui->dy < oy) {
+ tana = xdiff / ydiff;
+ offset = 0.0F;
+ } else if (ui->dx > ox && ui->dy > oy) {
+ tana = ydiff / xdiff;
+ offset = PI/2.0F;
+ } else if (ui->dx < ox && ui->dy > oy) {
+ tana = xdiff / ydiff;
+ offset = PI;
+ } else {
+ tana = ydiff / xdiff;
+ offset = 3.0F * PI / 2.0F;
+ }
+ ang = atan(tana) + offset;
+ }
+
+ if (!ui->drag_is_from) ang += PI; /* point to origin, not away from. */
+
+ }
+ draw_arrow(dr, ui->dx, ui->dy, ARROW_HALFSZ, ang, acol, acol);
+}
+
+static void game_redraw(drawing *dr, game_drawstate *ds, game_state *oldstate,
+ game_state *state, int dir, game_ui *ui,
+ float animtime, float flashtime)
+{
+ int x, y, i, w = ds->w, dirp, force = 0;
+ unsigned int f;
+ double angle_offset = 0.0;
+ game_state *postdrop = NULL;
+
+ if (flashtime > 0.0F)
+ angle_offset = 2.0 * PI * (flashtime / FLASH_SPIN);
+ if (angle_offset != ds->angle_offset) {
+ ds->angle_offset = angle_offset;
+ force = 1;
+ }
+
+ if (ds->dragging) {
+ assert(ds->dragb);
+ blitter_load(dr, ds->dragb, ds->dx, ds->dy);
+ draw_update(dr, ds->dx, ds->dy, BLITTER_SIZE, BLITTER_SIZE);
+ ds->dragging = FALSE;
+ }
+
+ /* If an in-progress drag would make a valid move if finished, we
+ * reflect that move in the board display. We let interpret_move do
+ * most of the heavy lifting for us: we have to copy the game_ui so
+ * as not to stomp on the real UI's drag state. */
+ if (ui->dragging) {
+ game_ui uicopy = *ui;
+ char *movestr = interpret_move(state, &uicopy, ds, ui->dx, ui->dy, LEFT_RELEASE);
+
+ if (movestr != NULL && strcmp(movestr, "") != 0) {
+ postdrop = execute_move(state, movestr);
+ sfree(movestr);
+
+ state = postdrop;
+ }
+ }
+
+ if (!ds->started) {
+ int aw = TILE_SIZE * state->w;
+ int ah = TILE_SIZE * state->h;
+ draw_rect(dr, 0, 0, aw + 2 * BORDER, ah + 2 * BORDER, COL_BACKGROUND);
+ draw_rect_outline(dr, BORDER - 1, BORDER - 1, aw + 2, ah + 2, COL_GRID);
+ draw_update(dr, 0, 0, aw + 2 * BORDER, ah + 2 * BORDER);
+ }
+ for (x = 0; x < state->w; x++) {
+ for (y = 0; y < state->h; y++) {
+ i = y*w + x;
+ f = 0;
+ dirp = -1;
+
+ if (ui->cshow && x == ui->cx && y == ui->cy)
+ f |= F_CUR;
+
+ if (ui->dragging) {
+ if (x == ui->sx && y == ui->sy)
+ f |= F_DRAG_SRC;
+ else if (ui->drag_is_from) {
+ if (!ispointing(state, ui->sx, ui->sy, x, y))
+ f |= F_DIM;
+ } else {
+ if (!ispointing(state, x, y, ui->sx, ui->sy))
+ f |= F_DIM;
+ }
+ }
+
+ if (state->impossible ||
+ state->nums[i] < 0 || state->flags[i] & FLAG_ERROR)
+ f |= F_ERROR;
+ if (state->flags[i] & FLAG_IMMUTABLE)
+ f |= F_IMMUTABLE;
+
+ if (state->next[i] != -1)
+ f |= F_ARROW_POINT;
+
+ if (state->prev[i] != -1) {
+ /* Currently the direction here is from our square _back_
+ * to its previous. We could change this to give the opposite
+ * sense to the direction. */
+ f |= F_ARROW_INPOINT;
+ dirp = whichdir(x, y, state->prev[i]%w, state->prev[i]/w);
+ }
+
+ if (state->nums[i] != ds->nums[i] ||
+ f != ds->f[i] || dirp != ds->dirp[i] ||
+ force || !ds->started) {
+ tile_redraw(dr, ds,
+ BORDER + x * TILE_SIZE,
+ BORDER + y * TILE_SIZE,
+ state->dirs[i], dirp, state->nums[i], f,
+ angle_offset, -1);
+ ds->nums[i] = state->nums[i];
+ ds->f[i] = f;
+ ds->dirp[i] = dirp;
+ }
+ }
+ }
+ if (ui->dragging) {
+ ds->dragging = TRUE;
+ ds->dx = ui->dx - BLITTER_SIZE/2;
+ ds->dy = ui->dy - BLITTER_SIZE/2;
+ blitter_save(dr, ds->dragb, ds->dx, ds->dy);
+
+ draw_drag_indicator(dr, ds, state, ui, postdrop ? 1 : 0);
+ }
+ if (postdrop) free_game(postdrop);
+ if (!ds->started) ds->started = TRUE;
+}
+
+static float game_anim_length(game_state *oldstate, game_state *newstate,
+ int dir, game_ui *ui)
+{
+ return 0.0F;
+}
+
+static float game_flash_length(game_state *oldstate, game_state *newstate,
+ int dir, game_ui *ui)
+{
+ if (!oldstate->completed &&
+ newstate->completed && !newstate->used_solve)
+ return FLASH_SPIN;
+ else
+ return 0.0F;
+}
+
+static int game_timing_state(game_state *state, game_ui *ui)
+{
+ return TRUE;
+}
+
+static void game_print_size(game_params *params, float *x, float *y)
+{
+ int pw, ph;
+
+ game_compute_size(params, 1300, &pw, &ph);
+ *x = pw / 100.0F;
+ *y = ph / 100.0F;
+}
+
+static void game_print(drawing *dr, game_state *state, int tilesize)
+{
+ int ink = print_mono_colour(dr, 0);
+ int x, y;
+
+ /* Fake up just enough of a drawstate */
+ game_drawstate ads, *ds = &ads;
+ ds->tilesize = tilesize;
+ ds->n = state->n;
+
+ /*
+ * Border and grid.
+ */
+ print_line_width(dr, TILE_SIZE / 40);
+ for (x = 1; x < state->w; x++)
+ draw_line(dr, COORD(x), COORD(0), COORD(x), COORD(state->h), ink);
+ for (y = 1; y < state->h; y++)
+ draw_line(dr, COORD(0), COORD(y), COORD(state->w), COORD(y), ink);
+ print_line_width(dr, 2*TILE_SIZE / 40);
+ draw_rect_outline(dr, COORD(0), COORD(0), TILE_SIZE*state->w,
+ TILE_SIZE*state->h, ink);
+
+ /*
+ * Arrows and numbers.
+ */
+ print_line_width(dr, 0);
+ for (y = 0; y < state->h; y++)
+ for (x = 0; x < state->w; x++)
+ tile_redraw(dr, ds, COORD(x), COORD(y), state->dirs[y*state->w+x],
+ 0, state->nums[y*state->w+x], 0, 0.0, ink);
+}
+
+#ifdef COMBINED
+#define thegame signpost
+#endif
+
+const struct game thegame = {
+ "Signpost", "games.signpost", "signpost",
+ default_params,
+ game_fetch_preset,
+ decode_params,
+ encode_params,
+ free_params,
+ dup_params,
+ TRUE, game_configure, custom_params,
+ validate_params,
+ new_game_desc,
+ validate_desc,
+ new_game,
+ dup_game,
+ free_game,
+ TRUE, solve_game,
+ TRUE, game_can_format_as_text_now, game_text_format,
+ new_ui,
+ free_ui,
+ 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,
+ TRUE, FALSE, game_print_size, game_print,
+ FALSE, /* wants_statusbar */
+ FALSE, game_timing_state,
+ REQUIRE_RBUTTON | REQUIRE_NUMPAD, /* flags */
+};
+
+#ifdef STANDALONE_SOLVER
+
+#include <time.h>
+#include <stdarg.h>
+
+const char *quis = NULL;
+int verbose = 0;
+
+void usage(FILE *out) {
+ fprintf(out, "usage: %s [--stdin] [--soak] [--seed SEED] <params>|<game id>\n", quis);
+}
+
+static void cycle_seed(char **seedstr, random_state *rs)
+{
+ char newseed[16];
+ int j;
+
+ newseed[15] = '\0';
+ newseed[0] = '1' + (char)random_upto(rs, 9);
+ for (j = 1; j < 15; j++)
+ newseed[j] = '0' + (char)random_upto(rs, 10);
+ sfree(*seedstr);
+ *seedstr = dupstr(newseed);
+}
+
+static void start_soak(game_params *p, char *seedstr)
+{
+ time_t tt_start, tt_now, tt_last;
+ char *desc, *aux;
+ random_state *rs;
+ long n = 0, nnums = 0, i;
+ game_state *state;
+
+ tt_start = tt_now = time(NULL);
+ printf("Soak-generating a %dx%d grid.\n", p->w, p->h);
+
+ while (1) {
+ rs = random_new(seedstr, strlen(seedstr));
+ desc = thegame.new_desc(p, rs, &aux, 0);
+
+ state = thegame.new_game(NULL, p, desc);
+ for (i = 0; i < state->n; i++) {
+ if (state->flags[i] & FLAG_IMMUTABLE)
+ nnums++;
+ }
+ thegame.free_game(state);
+
+ sfree(desc);
+ cycle_seed(&seedstr, rs);
+ random_free(rs);
+
+ n++;
+ tt_last = time(NULL);
+ if (tt_last > tt_now) {
+ tt_now = tt_last;
+ printf("%ld total, %3.1f/s, %3.1f nums/grid (%3.1f%%).\n",
+ n,
+ (double)n / ((double)tt_now - tt_start),
+ (double)nnums / (double)n,
+ ((double)nnums * 100.0) / ((double)n * (double)p->w * (double)p->h) );
+ }
+ }
+}
+
+static void process_desc(char *id)
+{
+ char *desc, *err, *solvestr;
+ game_params *p;
+ game_state *s;
+
+ printf("%s\n ", id);
+
+ desc = strchr(id, ':');
+ if (!desc) {
+ fprintf(stderr, "%s: expecting game description.", quis);
+ exit(1);
+ }
+
+ *desc++ = '\0';
+
+ p = thegame.default_params();
+ thegame.decode_params(p, id);
+ err = thegame.validate_params(p, 1);
+ if (err) {
+ fprintf(stderr, "%s: %s", quis, err);
+ thegame.free_params(p);
+ return;
+ }
+
+ err = thegame.validate_desc(p, desc);
+ if (err) {
+ fprintf(stderr, "%s: %s\nDescription: %s\n", quis, err, desc);
+ thegame.free_params(p);
+ return;
+ }
+
+ s = thegame.new_game(NULL, p, desc);
+
+ solvestr = thegame.solve(s, s, NULL, &err);
+ if (!solvestr)
+ fprintf(stderr, "%s\n", err);
+ else
+ printf("Puzzle is soluble.\n");
+
+ thegame.free_game(s);
+ thegame.free_params(p);
+}
+
+int main(int argc, const char *argv[])
+{
+ char *id = NULL, *desc, *err, *aux = NULL;
+ int soak = 0, verbose = 0, stdin_desc = 0, n = 1, i;
+ char *seedstr = NULL, newseed[16];
+
+ setvbuf(stdout, NULL, _IONBF, 0);
+
+ quis = argv[0];
+ while (--argc > 0) {
+ char *p = (char*)(*++argv);
+ if (!strcmp(p, "-v") || !strcmp(p, "--verbose"))
+ verbose = 1;
+ else if (!strcmp(p, "--stdin"))
+ stdin_desc = 1;
+ else if (!strcmp(p, "-e") || !strcmp(p, "--seed")) {
+ seedstr = dupstr(*++argv);
+ argc--;
+ } else if (!strcmp(p, "-n") || !strcmp(p, "--number")) {
+ n = atoi(*++argv);
+ argc--;
+ } else if (!strcmp(p, "-s") || !strcmp(p, "--soak")) {
+ soak = 1;
+ } else if (*p == '-') {
+ fprintf(stderr, "%s: unrecognised option `%s'\n", argv[0], p);
+ usage(stderr);
+ exit(1);
+ } else {
+ id = p;
+ }
+ }
+
+ sprintf(newseed, "%lu", time(NULL));
+ seedstr = dupstr(newseed);
+
+ if (id || !stdin_desc) {
+ if (id && strchr(id, ':')) {
+ /* Parameters and description passed on cmd-line:
+ * try and solve it. */
+ process_desc(id);
+ } else {
+ /* No description passed on cmd-line: decode parameters
+ * (with optional seed too) */
+
+ game_params *p = thegame.default_params();
+
+ if (id) {
+ char *cmdseed = strchr(id, '#');
+ if (cmdseed) {
+ *cmdseed++ = '\0';
+ sfree(seedstr);
+ seedstr = dupstr(cmdseed);
+ }
+
+ thegame.decode_params(p, id);
+ }
+
+ err = thegame.validate_params(p, 1);
+ if (err) {
+ fprintf(stderr, "%s: %s", quis, err);
+ thegame.free_params(p);
+ exit(1);
+ }
+
+ /* We have a set of valid parameters; either soak with it
+ * or generate a single game description and print to stdout. */
+ if (soak)
+ start_soak(p, seedstr);
+ else {
+ char *pstring = thegame.encode_params(p, 0);
+
+ for (i = 0; i < n; i++) {
+ random_state *rs = random_new(seedstr, strlen(seedstr));
+
+ if (verbose) printf("%s#%s\n", pstring, seedstr);
+ desc = thegame.new_desc(p, rs, &aux, 0);
+ printf("%s:%s\n", pstring, desc);
+ sfree(desc);
+
+ cycle_seed(&seedstr, rs);
+
+ random_free(rs);
+ }
+
+ sfree(pstring);
+ }
+ thegame.free_params(p);
+ }
+ }
+
+ if (stdin_desc) {
+ char buf[4096];
+
+ while (fgets(buf, sizeof(buf), stdin)) {
+ buf[strcspn(buf, "\r\n")] = '\0';
+ process_desc(buf);
+ }
+ }
+ sfree(seedstr);
+
+ return 0;
+}
+
+#endif
+
+
+/* vim: set shiftwidth=4 tabstop=8: */
~ian / sgt-puzzles.git / commitdiff