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puzzles/filling.c
Jacob Nevins 682ea218de Fix some border drawing issues. 
[originally from svn r7347]
2007-02-28 22:22:30 +00:00

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/* -*- tab-width: 8; indent-tabs-mode: t -*-
* filling.c: An implementation of the Nikoli game fillomino.
* Copyright (C) 2007 Jonas Kölker. See LICENSE for the license.
*/
/* TODO:
*
* - use a typedef instead of int for numbers on the board
* + replace int with something else (signed char?)
* - the type should be signed (I use -board[i] temporarily)
* - problems are small (<= 9?): type can be char?
*
* - make a somewhat more clever solver
*
* - make the solver do recursion/backtracking.
* + This is for user-submitted puzzles, not for puzzle
* generation (on the other hand, never say never).
*
* - prove that only w=h=2 needs a special case
*
* - solo-like pencil marks?
*
* - speed up generation of puzzles of size >= 11x11
*
* - Allow square contents > 9?
* + I could use letters for digits (solo does this), but
* letters don't have numeric significance (normal people hate
* base36), which is relevant here (much more than in solo).
* + How much information is needed to solve? Does one need to
* know the algorithm by which the largest number is set?
*
* - eliminate puzzle instances with done chunks (1's in particular)?
* + that's what the qsort call is all about.
* + the 1's don't bother me that much.
* + but this takes a LONG time (not always possible)?
* - this may be affected by solver (lack of) quality.
* - weed them out by construction instead of post-cons check
* + but that interleaves make_board and new_game_desc: you
* have to alternate between changing the board and
* changing the hint set (instead of just creating the
* board once, then changing the hint set once -> done).
*
* - use binary search when discovering the minimal sovable point
* + profile to show a need (but when the solver gets slower...)
* + avg 0.1s per 9x9, which _is_ human-patience noticable.
*/
#include <assert.h>
#include <ctype.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "puzzles.h"
struct game_params {
int w, h;
};
struct shared_state {
struct game_params params;
int *clues;
int refcnt;
};
struct game_state {
int *board;
struct shared_state *shared;
int completed, cheated;
};
static const struct game_params defaults[3] = {{5, 5}, {7, 7}, {9, 9}};
static game_params *default_params(void)
{
game_params *ret = snew(game_params);
*ret = defaults[1]; /* struct copy */
return ret;
}
static int game_fetch_preset(int i, char **name, game_params **params)
{
char buf[64];
if (i < 0 || i >= lenof(defaults)) return FALSE;
*params = snew(game_params);
**params = defaults[i]; /* struct copy */
sprintf(buf, "%dx%d", defaults[i].w, defaults[i].h);
*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; /* struct 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') ret->h = atoi(++string);
}
static char *encode_params(game_params *params, int full)
{
char buf[64];
sprintf(buf, "%dx%d", params->w, params->h);
return dupstr(buf);
}
static config_item *game_configure(game_params *params)
{
config_item *ret;
char buf[64];
ret = snewn(3, 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 = NULL;
ret[2].type = C_END;
ret[2].sval = NULL;
ret[2].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);
return ret;
}
static char *validate_params(game_params *params, int full)
{
if (params->w < 1) return "Width must be at least one";
if (params->h < 1) return "Height must be at least one";
return NULL;
}
/*****************************************************************************
* STRINGIFICATION OF GAME STATE *
*****************************************************************************/
#define EMPTY 0
/* Example of plaintext rendering:
* +---+---+---+---+---+---+---+
* | 6 | | | 2 | | | 2 |
* +---+---+---+---+---+---+---+
* | | 3 | | 6 | | 3 | |
* +---+---+---+---+---+---+---+
* | 3 | | | | | | 1 |
* +---+---+---+---+---+---+---+
* | | 2 | 3 | | 4 | 2 | |
* +---+---+---+---+---+---+---+
* | 2 | | | | | | 3 |
* +---+---+---+---+---+---+---+
* | | 5 | | 1 | | 4 | |
* +---+---+---+---+---+---+---+
* | 4 | | | 3 | | | 3 |
* +---+---+---+---+---+---+---+
*
* This puzzle instance is taken from the nikoli website
* Encoded (unsolved and solved), the strings are these:
* 7x7:6002002030603030000010230420200000305010404003003
* 7x7:6662232336663232331311235422255544325413434443313
*/
static char *board_to_string(int *board, int w, int h) {
const int sz = w * h;
const int chw = (4*w + 2); /* +2 for trailing '+' and '\n' */
const int chh = (2*h + 1); /* +1: n fence segments, n+1 posts */
const int chlen = chw * chh;
char *repr = snewn(chlen + 1, char);
int i;
assert(board);
/* build the first line ("^(\+---){n}\+$") */
for (i = 0; i < w; ++i) {
repr[4*i + 0] = '+';
repr[4*i + 1] = '-';
repr[4*i + 2] = '-';
repr[4*i + 3] = '-';
}
repr[4*i + 0] = '+';
repr[4*i + 1] = '\n';
/* ... and copy it onto the odd-numbered lines */
for (i = 0; i < h; ++i) memcpy(repr + (2*i + 2) * chw, repr, chw);
/* build the second line ("^(\|\t){n}\|$") */
for (i = 0; i < w; ++i) {
repr[chw + 4*i + 0] = '|';
repr[chw + 4*i + 1] = ' ';
repr[chw + 4*i + 2] = ' ';
repr[chw + 4*i + 3] = ' ';
}
repr[chw + 4*i + 0] = '|';
repr[chw + 4*i + 1] = '\n';
/* ... and copy it onto the even-numbered lines */
for (i = 1; i < h; ++i) memcpy(repr + (2*i + 1) * chw, repr + chw, chw);
/* fill in the numbers */
for (i = 0; i < sz; ++i) {
const int x = i % w;
const int y = i / w;
if (board[i] == EMPTY) continue;
repr[chw*(2*y + 1) + (4*x + 2)] = board[i] + '0';
}
repr[chlen] = '\0';
return repr;
}
static char *game_text_format(game_state *state)
{
const int w = state->shared->params.w;
const int h = state->shared->params.h;
return board_to_string(state->board, w, h);
}
/*****************************************************************************
* GAME GENERATION AND SOLVER *
*****************************************************************************/
static const int dx[4] = {-1, 1, 0, 0};
static const int dy[4] = {0, 0, -1, 1};
/*
static void print_board(int *board, int w, int h) {
char *repr = board_to_string(board, w, h);
fputs(repr, stdout);
free(repr);
}
*/
#define SENTINEL sz
/* determines whether a board (in dsf form) is valid. If possible,
* return a conflicting pair in *a and *b and a non-*b neighbour of *a
* in *c. If not possible, leave them unmodified. */
static void
validate_board(int *dsf, int w, int h, int *sq, int *a, int *b, int *c) {
const int sz = w * h;
int i;
assert(*a == SENTINEL);
assert(*b == SENTINEL);
assert(*c == SENTINEL);
for (i = 0; i < sz && *a == sz; ++i) {
const int aa = dsf_canonify(dsf, sq[i]);
int cc = sz;
int j;
for (j = 0; j < 4; ++j) {
const int x = (sq[i] % w) + dx[j];
const int y = (sq[i] / w) + dy[j];
int bb;
if (x < 0 || x >= w || y < 0 || y >= h) continue;
bb = dsf_canonify(dsf, w*y + x);
if (aa == bb) continue;
else if (dsf_size(dsf, aa) == dsf_size(dsf, bb)) {
*a = aa;
*b = bb;
*c = cc;
} else if (cc == sz) *c = cc = bb;
}
}
}
static game_state *new_game(midend *, game_params *, char *);
static void free_game(game_state *);
/* generate a random valid board; uses validate_board. */
static void make_board(int *board, int w, int h, random_state *rs) {
int *dsf;
const unsigned int sz = w * h;
/* w=h=2 is a special case which requires a number > max(w, h) */
/* TODO prove that this is the case ONLY for w=h=2. */
const int maxsize = min(max(max(w, h), 3), 9);
/* Note that if 1 in {w, h} then it's impossible to have a region
* of size > w*h, so the special case only affects w=h=2. */
int nboards = 0;
int i;
assert(w >= 1);
assert(h >= 1);
assert(board);
dsf = snew_dsf(sz); /* implicit dsf_init */
/* I abuse the board variable: when generating the puzzle, it
* contains a shuffled list of numbers {0, ..., nsq-1}. */
for (i = 0; i < sz; ++i) board[i] = i;
while (1) {
++nboards;
shuffle(board, sz, sizeof (int), rs);
/* while the board can in principle be fixed */
while (1) {
int a = SENTINEL;
int b = SENTINEL;
int c = SENTINEL;
validate_board(dsf, w, h, board, &a, &b, &c);
if (a == SENTINEL /* meaning the board is valid */) {
int i;
for (i = 0; i < sz; ++i) board[i] = dsf_size(dsf, i);
sfree(dsf);
/* printf("returning board number %d\n", nboards); */
return;
} else {
/* try to repair the invalid board */
a = dsf_canonify(dsf, a);
assert(a != dsf_canonify(dsf, b));
if (c != sz) assert(a != dsf_canonify(dsf, c));
dsf_merge(dsf, a, c == sz? b: c);
/* if repair impossible; make a new board */
if (dsf_size(dsf, a) > maxsize) break;
}
}
dsf_init(dsf, sz); /* re-init the dsf */
}
assert(FALSE); /* unreachable */
}
static int rhofree(int *hop, int start) {
int turtle = start, rabbit = hop[start];
while (rabbit != turtle) { /* find a cycle */
turtle = hop[turtle];
rabbit = hop[hop[rabbit]];
}
do { /* check that start is in the cycle */
rabbit = hop[rabbit];
if (start == rabbit) return 1;
} while (rabbit != turtle);
return 0;
}
static void merge(int *dsf, int *connected, int a, int b) {
int c;
assert(dsf);
assert(connected);
assert(rhofree(connected, a));
assert(rhofree(connected, b));
a = dsf_canonify(dsf, a);
b = dsf_canonify(dsf, b);
if (a == b) return;
dsf_merge(dsf, a, b);
c = connected[a];
connected[a] = connected[b];
connected[b] = c;
assert(rhofree(connected, a));
assert(rhofree(connected, b));
}
static void *memdup(const void *ptr, size_t len, size_t esz) {
void *dup = smalloc(len * esz);
assert(ptr);
memcpy(dup, ptr, len * esz);
return dup;
}
static void expand(int *board, int *connected, int *dsf, int w, int h,
int dst, int src, int *empty, int *learn) {
int j;
assert(board);
assert(connected);
assert(dsf);
assert(empty);
assert(learn);
assert(board[dst] == EMPTY);
assert(board[src] != EMPTY);
board[dst] = board[src];
for (j = 0; j < 4; ++j) {
const int x = (dst % w) + dx[j];
const int y = (dst / w) + dy[j];
const int idx = w*y + x;
if (x < 0 || x >= w || y < 0 || y >= h) continue;
if (board[idx] != board[dst]) continue;
merge(dsf, connected, dst, idx);
}
/* printf("set board[%d] = board[%d], which is %d; size(%d) = %d\n", dst, src, board[src], src, dsf[dsf_canonify(dsf, src)] >> 2); */
--*empty;
*learn = TRUE;
}
static void flood(int *board, int w, int h, int i, int n) {
const int sz = w * h;
int k;
if (board[i] == EMPTY) board[i] = -SENTINEL;
else if (board[i] == n) board[i] = -board[i];
else return;
for (k = 0; k < 4; ++k) {
const int x = (i % w) + dx[k];
const int y = (i / w) + dy[k];
const int idx = w*y + x;
if (x < 0 || x >= w || y < 0 || y >= h) continue;
flood(board, w, h, idx, n);
}
}
static int count_and_clear(int *board, int sz) {
int count = -1;
int i;
for (i = 0; i < sz; ++i) {
if (board[i] >= 0) continue;
++count;
if (board[i] == -SENTINEL) board[i] = EMPTY;
else board[i] = -board[i];
}
return count;
}
static int count(int *board, int w, int h, int i) {
flood(board, w, h, i, board[i]);
return count_and_clear(board, w * h);
}
static int expandsize(const int *board, int *dsf, int w, int h, int i, int n) {
int j;
int nhits = 0;
int hits[4];
int size = 1;
for (j = 0; j < 4; ++j) {
const int x = (i % w) + dx[j];
const int y = (i / w) + dy[j];
const int idx = w*y + x;
int root;
int m;
if (x < 0 || x >= w || y < 0 || y >= h) continue;
if (board[idx] != n) continue;
root = dsf_canonify(dsf, idx);
for (m = 0; m < nhits && root != hits[m]; ++m);
if (m < nhits) continue;
/* printf("\t (%d, %d) contributed %d to size\n", lx, ly, dsf[root] >> 2); */
size += dsf_size(dsf, root);
assert(dsf_size(dsf, root) >= 1);
hits[nhits++] = root;
}
return size;
}
/*
* +---+---+---+---+---+---+---+
* | 6 | | | 2 | | | 2 |
* +---+---+---+---+---+---+---+
* | | 3 | | 6 | | 3 | |
* +---+---+---+---+---+---+---+
* | 3 | | | | | | 1 |
* +---+---+---+---+---+---+---+
* | | 2 | 3 | | 4 | 2 | |
* +---+---+---+---+---+---+---+
* | 2 | | | | | | 3 |
* +---+---+---+---+---+---+---+
* | | 5 | | 1 | | 4 | |
* +---+---+---+---+---+---+---+
* | 4 | | | 3 | | | 3 |
* +---+---+---+---+---+---+---+
*/
/* Solving techniques:
*
* CONNECTED COMPONENT FORCED EXPANSION (too big):
* When a CC can only be expanded in one direction, because all the
* other ones would make the CC too big.
* +---+---+---+---+---+
* | 2 | 2 | | 2 | _ |
* +---+---+---+---+---+
*
* CONNECTED COMPONENT FORCED EXPANSION (too small):
* When a CC must include a particular square, because otherwise there
* would not be enough room to complete it.
* +---+---+
* | 2 | _ |
* +---+---+
*
* DROPPING IN A ONE:
* When an empty square has no neighbouring empty squares and only a 1
* will go into the square (or other CCs would be too big).
* +---+---+---+
* | 2 | 2 | _ |
* +---+---+---+
*
* TODO: generalise DROPPING IN A ONE: find the size of the CC of
* empty squares and a list of all adjacent numbers. See if only one
* number in {1, ..., size} u {all adjacent numbers} is possible.
* Probably this is only effective for a CC size < n for some n (4?)
*
* TODO: backtracking.
*/
#define EXPAND(a, b)\
expand(board, connected, dsf, w, h, a, b, &nempty, &learn)
static int solver(const int *orig, int w, int h, char **solution) {
const int sz = w * h;
int *board = memdup(orig, sz, sizeof (int));
int *dsf = snew_dsf(sz); /* eqv classes: connected components */
int *connected = snewn(sz, int); /* connected[n] := n.next; */
/* cyclic disjoint singly linked lists, same partitioning as dsf.
* The lists lets you iterate over a partition given any member */
int nempty = 0;
int learn;
int i;
for (i = 0; i < sz; i++) connected[i] = i;
for (i = 0; i < sz; ++i) {
int j;
if (board[i] == EMPTY) ++nempty;
else for (j = 0; j < 4; ++j) {
const int x = (i % w) + dx[j];
const int y = (i / w) + dy[j];
const int idx = w*y + x;
if (x < 0 || x >= w || y < 0 || y >= h) continue;
if (board[i] == board[idx]) merge(dsf, connected, i, idx);
}
}
/* puts("trying to solve this:");
print_board(board, w, h); */
/* TODO: refactor this code, it's too long */
do {
int i;
learn = FALSE;
/* for every connected component */
for (i = 0; i < sz; ++i) {
int exp = SENTINEL;
int j;
/* If the component consists of empty squares */
if (board[i] == EMPTY) {
int k;
int one = TRUE;
for (k = 0; k < 4; ++k) {
const int x = (i % w) + dx[k];
const int y = (i / w) + dy[k];
const int idx = w*y + x;
int n;
if (x < 0 || x >= w || y < 0 || y >= h) continue;
if (board[idx] == EMPTY) {
one = FALSE;
continue;
}
if (one &&
(board[idx] == 1 ||
(board[idx] >= expandsize(board, dsf, w, h,
i, board[idx]))))
one = FALSE;
assert(board[i] == EMPTY);
board[i] = -SENTINEL;
n = count(board, w, h, idx);
assert(board[i] == EMPTY);
if (n >= board[idx]) continue;
EXPAND(i, idx);
break;
}
if (k == 4 && one) {
assert(board[i] == EMPTY);
board[i] = 1;
assert(nempty);
--nempty;
learn = TRUE;
}
continue;
}
/* printf("expanding blob of (%d, %d)\n", i % w, i / w); */
j = dsf_canonify(dsf, i);
/* (but only for each connected component) */
if (i != j) continue;
/* (and not if it's already complete) */
if (dsf_size(dsf, j) == board[j]) continue;
/* for each square j _in_ the connected component */
do {
int k;
/* printf(" looking at (%d, %d)\n", j % w, j / w); */
/* for each neighbouring square (idx) */
for (k = 0; k < 4; ++k) {
const int x = (j % w) + dx[k];
const int y = (j / w) + dy[k];
const int idx = w*y + x;
int size;
/* int l;
int nhits = 0;
int hits[4]; */
if (x < 0 || x >= w || y < 0 || y >= h) continue;
if (board[idx] != EMPTY) continue;
if (exp == idx) continue;
/* printf("\ttrying to expand onto (%d, %d)\n", x, y); */
/* find out the would-be size of the new connected
* component if we actually expanded into idx */
/*
size = 1;
for (l = 0; l < 4; ++l) {
const int lx = x + dx[l];
const int ly = y + dy[l];
const int idxl = w*ly + lx;
int root;
int m;
if (lx < 0 || lx >= w || ly < 0 || ly >= h) continue;
if (board[idxl] != board[j]) continue;
root = dsf_canonify(dsf, idxl);
for (m = 0; m < nhits && root != hits[m]; ++m);
if (m != nhits) continue;
// printf("\t (%d, %d) contributed %d to size\n", lx, ly, dsf[root] >> 2);
size += dsf_size(dsf, root);
assert(dsf_size(dsf, root) >= 1);
hits[nhits++] = root;
}
*/
size = expandsize(board, dsf, w, h, idx, board[j]);
/* ... and see if that size is too big, or if we
* have other expansion candidates. Otherwise
* remember the (so far) only candidate. */
/* printf("\tthat would give a size of %d\n", size); */
if (size > board[j]) continue;
/* printf("\tnow knowing %d expansions\n", nexpand + 1); */
if (exp != SENTINEL) goto next_i;
assert(exp != idx);
exp = idx;
}
j = connected[j]; /* next square in the same CC */
assert(board[i] == board[j]);
} while (j != i);
/* end: for each square j _in_ the connected component */
if (exp == SENTINEL) continue;
/* printf("expand b: %d -> %d\n", i, exp); */
EXPAND(exp, i);
next_i:
;
}
/* end: for each connected component */
} while (learn && nempty);
/* puts("best guess:");
print_board(board, w, h); */
if (solution) {
int i;
assert(*solution == NULL);
*solution = snewn(sz + 2, char);
**solution = 's';
for (i = 0; i < sz; ++i) (*solution)[i + 1] = board[i] + '0';
(*solution)[sz + 1] = '\0';
/* We don't need the \0 for execute_move (the only user)
* I'm just being printf-friendly in case I wanna print */
}
sfree(dsf);
sfree(board);
sfree(connected);
return !nempty;
}
static int *make_dsf(int *dsf, int *board, const int w, const int h) {
const int sz = w * h;
int i;
if (!dsf)
dsf = snew_dsf(w * h);
else
dsf_init(dsf, w * h);
for (i = 0; i < sz; ++i) {
int j;
for (j = 0; j < 4; ++j) {
const int x = (i % w) + dx[j];
const int y = (i / w) + dy[j];
const int k = w*y + x;
if (x < 0 || x >= w || y < 0 || y >= h) continue;
if (board[i] == board[k]) dsf_merge(dsf, i, k);
}
}
return dsf;
}
/*
static int filled(int *board, int *randomize, int k, int n) {
int i;
if (board == NULL) return FALSE;
if (randomize == NULL) return FALSE;
if (k > n) return FALSE;
for (i = 0; i < k; ++i) if (board[randomize[i]] == 0) return FALSE;
for (; i < n; ++i) if (board[randomize[i]] != 0) return FALSE;
return TRUE;
}
*/
static int *g_board;
static int compare(const void *pa, const void *pb) {
if (!g_board) return 0;
return g_board[*(const int *)pb] - g_board[*(const int *)pa];
}
static char *new_game_desc(game_params *params, random_state *rs,
char **aux, int interactive)
{
const int w = params->w;
const int h = params->h;
const int sz = w * h;
int *board = snewn(sz, int);
int *randomize = snewn(sz, int);
int *solver_board = snewn(sz, int);
char *game_description = snewn(sz + 1, char);
int i;
for (i = 0; i < sz; ++i) {
board[i] = EMPTY;
randomize[i] = i;
}
make_board(board, w, h, rs);
memcpy(solver_board, board, sz * sizeof (int));
g_board = board;
qsort(randomize, sz, sizeof (int), compare);
/* since more clues only helps and never hurts, one pass will do
* just fine: if we can remove clue n with k clues of index > n,
* we could have removed clue n with >= k clues of index > n.
* So an additional pass wouldn't do anything [use induction]. */
for (i = 0; i < sz; ++i) {
solver_board[randomize[i]] = EMPTY;
if (!solver(solver_board, w, h, NULL))
solver_board[randomize[i]] = board[randomize[i]];
}
for (i = 0; i < sz; ++i) {
assert(solver_board[i] >= 0);
assert(solver_board[i] < 10);
game_description[i] = solver_board[i] + '0';
}
game_description[sz] = '\0';
/*
solver(solver_board, w, h, aux);
print_board(solver_board, w, h);
*/
sfree(randomize);
sfree(solver_board);
sfree(board);
return game_description;
}
static char *validate_desc(game_params *params, char *desc)
{
int i;
const int sz = params->w * params->h;
const char m = '0' + max(max(params->w, params->h), 3);
/* printf("desc = '%s'; sz = %d\n", desc, sz); */
for (i = 0; desc[i] && i < sz; ++i)
if (!isdigit((unsigned char) *desc))
return "non-digit in string";
else if (desc[i] > m)
return "too large digit in string";
if (desc[i]) return "string too long";
else if (i < sz) return "string too short";
return NULL;
}
static game_state *new_game(midend *me, game_params *params, char *desc)
{
game_state *state = snew(game_state);
int sz = params->w * params->h;
int i;
state->cheated = state->completed = FALSE;
state->shared = snew(struct shared_state);
state->shared->refcnt = 1;
state->shared->params = *params; /* struct copy */
state->shared->clues = snewn(sz, int);
for (i = 0; i < sz; ++i) state->shared->clues[i] = desc[i] - '0';
state->board = memdup(state->shared->clues, sz, sizeof (int));
return state;
}
static game_state *dup_game(game_state *state)
{
const int sz = state->shared->params.w * state->shared->params.h;
game_state *ret = snew(game_state);
ret->board = memdup(state->board, sz, sizeof (int));
ret->shared = state->shared;
ret->cheated = state->cheated;
ret->completed = state->completed;
++ret->shared->refcnt;
return ret;
}
static void free_game(game_state *state)
{
assert(state);
sfree(state->board);
if (--state->shared->refcnt == 0) {
sfree(state->shared->clues);
sfree(state->shared);
}
sfree(state);
}
static char *solve_game(game_state *state, game_state *currstate,
char *aux, char **error)
{
if (aux == NULL) {
const int w = state->shared->params.w;
const int h = state->shared->params.h;
if (!solver(state->board, w, h, &aux))
*error = "Sorry, I couldn't find a solution";
}
return aux;
}
/*****************************************************************************
* USER INTERFACE STATE AND ACTION *
*****************************************************************************/
struct game_ui {
int x, y; /* highlighted square, or (-1, -1) if none */
};
static game_ui *new_ui(game_state *state)
{
game_ui *ui = snew(game_ui);
ui->x = ui->y = -1;
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)
{
}
#define PREFERRED_TILE_SIZE 32
#define TILE_SIZE (ds->tilesize)
#define BORDER (TILE_SIZE / 2)
#define BORDER_WIDTH (TILE_SIZE / 32)
struct game_drawstate {
struct game_params params;
int tilesize;
int started;
int *v, *flags;
int *dsf_scratch, *border_scratch;
};
static char *interpret_move(game_state *state, game_ui *ui, game_drawstate *ds,
int x, int y, int button)
{
const int w = state->shared->params.w;
const int h = state->shared->params.h;
const int tx = (x + TILE_SIZE - BORDER) / TILE_SIZE - 1;
const int ty = (y + TILE_SIZE - BORDER) / TILE_SIZE - 1;
assert(ui);
assert(ds);
button &= ~MOD_MASK;
if (tx >= 0 && tx < w && ty >= 0 && ty < h) {
if (button == LEFT_BUTTON) {
if ((tx == ui->x && ty == ui->y) || state->shared->clues[w*ty+tx])
ui->x = ui->y = -1;
else ui->x = tx, ui->y = ty;
return ""; /* redraw */
}
}
assert((ui->x == -1) == (ui->y == -1));
if (ui->x == -1) return NULL;
assert(state->shared->clues[w*ui->y + ui->x] == 0);
switch (button) {
case ' ':
case '\r':
case '\n':
case '\b':
case '\177':
button = 0;
break;
default:
if (!isdigit(button)) return NULL;
button -= '0';
if (button > (w == 2 && h == 2? 3: max(w, h))) return NULL;
}
{
const int i = w*ui->y + ui->x;
char buf[64];
ui->x = ui->y = -1;
if (state->board[i] == button) {
return ""; /* no change - just update ui */
} else {
sprintf(buf, "%d_%d", i, button);
return dupstr(buf);
}
}
}
static game_state *execute_move(game_state *state, char *move)
{
game_state *new_state;
const int sz = state->shared->params.w * state->shared->params.h;
if (*move == 's') {
int i = 0;
new_state = dup_game(state);
for (++move; i < sz; ++i) new_state->board[i] = move[i] - '0';
new_state->cheated = TRUE;
} else {
char *endptr;
const int i = strtol(move, &endptr, 0);
int value;
if (endptr == move) return NULL;
if (*endptr != '_') return NULL;
move = endptr + 1;
value = strtol(move, &endptr, 0);
if (endptr == move) return NULL;
if (*endptr != '\0') return NULL;
if (i < 0 || i >= sz || value < 0 || value > 9) return NULL;
new_state = dup_game(state);
new_state->board[i] = value;
}
/*
* Check for completion.
*/
if (!new_state->completed) {
const int w = new_state->shared->params.w;
const int h = new_state->shared->params.h;
const int sz = w * h;
int *dsf = make_dsf(NULL, new_state->board, w, h);
int i;
for (i = 0; i < sz && new_state->board[i] == dsf_size(dsf, i); ++i);
sfree(dsf);
if (i == sz)
new_state->completed = TRUE;
}
return new_state;
}
/* ----------------------------------------------------------------------
* Drawing routines.
*/
#define FLASH_TIME 0.4F
#define COL_CLUE COL_GRID
enum {
COL_BACKGROUND,
COL_GRID,
COL_HIGHLIGHT,
COL_CORRECT,
COL_ERROR,
COL_USER,
NCOLOURS
};
static void game_compute_size(game_params *params, int tilesize,
int *x, int *y)
{
*x = (params->w + 1) * tilesize;
*y = (params->h + 1) * tilesize;
}
static void game_set_size(drawing *dr, game_drawstate *ds,
game_params *params, int tilesize)
{
ds->tilesize = tilesize;
}
static float *game_colours(frontend *fe, int *ncolours)
{
float *ret = snewn(3 * NCOLOURS, float);
frontend_default_colour(fe, &ret[COL_BACKGROUND * 3]);
ret[COL_GRID * 3 + 0] = 0.0F;
ret[COL_GRID * 3 + 1] = 0.0F;
ret[COL_GRID * 3 + 2] = 0.0F;
ret[COL_HIGHLIGHT * 3 + 0] = 0.85F * ret[COL_BACKGROUND * 3 + 0];
ret[COL_HIGHLIGHT * 3 + 1] = 0.85F * ret[COL_BACKGROUND * 3 + 1];
ret[COL_HIGHLIGHT * 3 + 2] = 0.85F * ret[COL_BACKGROUND * 3 + 2];
ret[COL_CORRECT * 3 + 0] = 0.9F * ret[COL_BACKGROUND * 3 + 0];
ret[COL_CORRECT * 3 + 1] = 0.9F * ret[COL_BACKGROUND * 3 + 1];
ret[COL_CORRECT * 3 + 2] = 0.9F * ret[COL_BACKGROUND * 3 + 2];
ret[COL_ERROR * 3 + 0] = 1.0F;
ret[COL_ERROR * 3 + 1] = 0.85F * ret[COL_BACKGROUND * 3 + 1];
ret[COL_ERROR * 3 + 2] = 0.85F * ret[COL_BACKGROUND * 3 + 2];
ret[COL_USER * 3 + 0] = 0.0F;
ret[COL_USER * 3 + 1] = 0.6F * ret[COL_BACKGROUND * 3 + 1];
ret[COL_USER * 3 + 2] = 0.0F;
*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 = PREFERRED_TILE_SIZE;
ds->started = 0;
ds->params = state->shared->params;
ds->v = snewn(ds->params.w * ds->params.h, int);
ds->flags = snewn(ds->params.w * ds->params.h, int);
for (i = 0; i < ds->params.w * ds->params.h; i++)
ds->v[i] = ds->flags[i] = -1;
ds->border_scratch = snewn(ds->params.w * ds->params.h, int);
ds->dsf_scratch = NULL;
return ds;
}
static void game_free_drawstate(drawing *dr, game_drawstate *ds)
{
sfree(ds->v);
sfree(ds->flags);
sfree(ds->border_scratch);
sfree(ds->dsf_scratch);
sfree(ds);
}
#define BORDER_U 0x001
#define BORDER_D 0x002
#define BORDER_L 0x004
#define BORDER_R 0x008
#define BORDER_UR 0x010
#define BORDER_DR 0x020
#define BORDER_UL 0x040
#define BORDER_DL 0x080
#define CURSOR_BG 0x100
#define CORRECT_BG 0x200
#define ERROR_BG 0x400
#define USER_COL 0x800
static void draw_square(drawing *dr, game_drawstate *ds, int x, int y,
int n, int flags)
{
assert(dr);
assert(ds);
/*
* Clip to the grid square.
*/
clip(dr, BORDER + x*TILE_SIZE, BORDER + y*TILE_SIZE,
TILE_SIZE, TILE_SIZE);
/*
* Clear the square.
*/
draw_rect(dr,
BORDER + x*TILE_SIZE,
BORDER + y*TILE_SIZE,
TILE_SIZE,
TILE_SIZE,
(flags & CURSOR_BG ? COL_HIGHLIGHT :
flags & ERROR_BG ? COL_ERROR :
flags & CORRECT_BG ? COL_CORRECT : COL_BACKGROUND));
/*
* Draw the grid lines.
*/
draw_line(dr, BORDER + x*TILE_SIZE, BORDER + y*TILE_SIZE,
BORDER + (x+1)*TILE_SIZE, BORDER + y*TILE_SIZE, COL_GRID);
draw_line(dr, BORDER + x*TILE_SIZE, BORDER + y*TILE_SIZE,
BORDER + x*TILE_SIZE, BORDER + (y+1)*TILE_SIZE, COL_GRID);
/*
* Draw the number.
*/
if (n) {
char buf[2];
buf[0] = n + '0';
buf[1] = '\0';
draw_text(dr,
(x + 1) * TILE_SIZE,
(y + 1) * TILE_SIZE,
FONT_VARIABLE,
TILE_SIZE / 2,
ALIGN_VCENTRE | ALIGN_HCENTRE,
flags & USER_COL ? COL_USER : COL_CLUE,
buf);
}
/*
* Draw bold lines around the borders.
*/
if (flags & BORDER_L)
draw_rect(dr,
BORDER + x*TILE_SIZE + 1,
BORDER + y*TILE_SIZE + 1,
BORDER_WIDTH,
TILE_SIZE - 1,
COL_GRID);
if (flags & BORDER_U)
draw_rect(dr,
BORDER + x*TILE_SIZE + 1,
BORDER + y*TILE_SIZE + 1,
TILE_SIZE - 1,
BORDER_WIDTH,
COL_GRID);
if (flags & BORDER_R)
draw_rect(dr,
BORDER + (x+1)*TILE_SIZE - BORDER_WIDTH,
BORDER + y*TILE_SIZE + 1,
BORDER_WIDTH,
TILE_SIZE - 1,
COL_GRID);
if (flags & BORDER_D)
draw_rect(dr,
BORDER + x*TILE_SIZE + 1,
BORDER + (y+1)*TILE_SIZE - BORDER_WIDTH,
TILE_SIZE - 1,
BORDER_WIDTH,
COL_GRID);
if (flags & BORDER_UL)
draw_rect(dr,
BORDER + x*TILE_SIZE + 1,
BORDER + y*TILE_SIZE + 1,
BORDER_WIDTH,
BORDER_WIDTH,
COL_GRID);
if (flags & BORDER_UR)
draw_rect(dr,
BORDER + (x+1)*TILE_SIZE - BORDER_WIDTH,
BORDER + y*TILE_SIZE + 1,
BORDER_WIDTH,
BORDER_WIDTH,
COL_GRID);
if (flags & BORDER_DL)
draw_rect(dr,
BORDER + x*TILE_SIZE + 1,
BORDER + (y+1)*TILE_SIZE - BORDER_WIDTH,
BORDER_WIDTH,
BORDER_WIDTH,
COL_GRID);
if (flags & BORDER_DR)
draw_rect(dr,
BORDER + (x+1)*TILE_SIZE - BORDER_WIDTH,
BORDER + (y+1)*TILE_SIZE - BORDER_WIDTH,
BORDER_WIDTH,
BORDER_WIDTH,
COL_GRID);
unclip(dr);
draw_update(dr,
BORDER + x*TILE_SIZE,
BORDER + y*TILE_SIZE,
TILE_SIZE,
TILE_SIZE);
}
static void draw_grid(drawing *dr, game_drawstate *ds, game_state *state,
game_ui *ui, int flashy, int borders, int shading)
{
const int w = state->shared->params.w;
const int h = state->shared->params.h;
int x;
int y;
/*
* Build a dsf for the board in its current state, to use for
* highlights and hints.
*/
ds->dsf_scratch = make_dsf(ds->dsf_scratch, state->board, w, h);
/*
* Work out where we're putting borders between the cells.
*/
for (y = 0; y < w*h; y++)
ds->border_scratch[y] = 0;
for (y = 0; y < h; y++)
for (x = 0; x < w; x++) {
int dx, dy;
int v1, s1, v2, s2;
for (dx = 0; dx <= 1; dx++) {
int border = FALSE;
dy = 1 - dx;
if (x+dx >= w || y+dy >= h)
continue;
v1 = state->board[y*w+x];
v2 = state->board[(y+dy)*w+(x+dx)];
s1 = dsf_size(ds->dsf_scratch, y*w+x);
s2 = dsf_size(ds->dsf_scratch, (y+dy)*w+(x+dx));
/*
* We only ever draw a border between two cells if
* they don't have the same contents.
*/
if (v1 != v2) {
/*
* But in that situation, we don't always draw
* a border. We do if the two cells both
* contain actual numbers...
*/
if (v1 && v2)
border = TRUE;
/*
* ... or if at least one of them is a
* completed or overfull omino.
*/
if (v1 && s1 >= v1)
border = TRUE;
if (v2 && s2 >= v2)
border = TRUE;
}
if (border)
ds->border_scratch[y*w+x] |= (dx ? 1 : 2);
}
}
/*
* Actually do the drawing.
*/
for (y = 0; y < h; ++y)
for (x = 0; x < w; ++x) {
/*
* Determine what we need to draw in this square.
*/
int v = state->board[y*w+x];
int flags = 0;
if (flashy || !shading) {
/* clear all background flags */
} else if (x == ui->x && y == ui->y) {
flags |= CURSOR_BG;
} else if (v) {
int size = dsf_size(ds->dsf_scratch, y*w+x);
if (size == v)
flags |= CORRECT_BG;
else if (size > v)
flags |= ERROR_BG;
}
/*
* Borders at the very edges of the grid are
* independent of the `borders' flag.
*/
if (x == 0)
flags |= BORDER_L;
if (y == 0)
flags |= BORDER_U;
if (x == w-1)
flags |= BORDER_R;
if (y == h-1)
flags |= BORDER_D;
if (borders) {
if (x == 0 || (ds->border_scratch[y*w+(x-1)] & 1))
flags |= BORDER_L;
if (y == 0 || (ds->border_scratch[(y-1)*w+x] & 2))
flags |= BORDER_U;
if (x == w-1 || (ds->border_scratch[y*w+x] & 1))
flags |= BORDER_R;
if (y == h-1 || (ds->border_scratch[y*w+x] & 2))
flags |= BORDER_D;
if (y > 0 && x > 0 && (ds->border_scratch[(y-1)*w+(x-1)]))
flags |= BORDER_UL;
if (y > 0 && x < w-1 &&
((ds->border_scratch[(y-1)*w+x] & 1) ||
(ds->border_scratch[(y-1)*w+(x+1)] & 2)))
flags |= BORDER_UR;
if (y < h-1 && x > 0 &&
((ds->border_scratch[y*w+(x-1)] & 2) ||
(ds->border_scratch[(y+1)*w+(x-1)] & 1)))
flags |= BORDER_DL;
if (y < h-1 && x < w-1 &&
((ds->border_scratch[y*w+(x+1)] & 2) ||
(ds->border_scratch[(y+1)*w+x] & 1)))
flags |= BORDER_DR;
}
if (!state->shared->clues[y*w+x])
flags |= USER_COL;
if (ds->v[y*w+x] != v || ds->flags[y*w+x] != flags) {
draw_square(dr, ds, x, y, v, flags);
ds->v[y*w+x] = v;
ds->flags[y*w+x] = flags;
}
}
}
static void game_redraw(drawing *dr, game_drawstate *ds, game_state *oldstate,
game_state *state, int dir, game_ui *ui,
float animtime, float flashtime)
{
const int w = state->shared->params.w;
const int h = state->shared->params.h;
const int flashy =
flashtime > 0 &&
(flashtime <= FLASH_TIME/3 || flashtime >= FLASH_TIME*2/3);
if (!ds->started) {
/*
* The initial contents of the window are not guaranteed and
* can vary with front ends. To be on the safe side, all games
* should start by drawing a big background-colour rectangle
* covering the whole window.
*/
draw_rect(dr, 0, 0, w*TILE_SIZE + 2*BORDER, h*TILE_SIZE + 2*BORDER,
COL_BACKGROUND);
/*
* Smaller black rectangle which is the main grid.
*/
draw_rect(dr, BORDER - BORDER_WIDTH, BORDER - BORDER_WIDTH,
w*TILE_SIZE + 2*BORDER_WIDTH + 1,
h*TILE_SIZE + 2*BORDER_WIDTH + 1,
COL_GRID);
draw_update(dr, 0, 0, w*TILE_SIZE + 2*BORDER, h*TILE_SIZE + 2*BORDER);
ds->started = TRUE;
}
draw_grid(dr, ds, state, ui, flashy, TRUE, 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)
{
assert(oldstate);
assert(newstate);
assert(newstate->shared);
assert(oldstate->shared == newstate->shared);
if (!oldstate->completed && newstate->completed &&
!oldstate->cheated && !newstate->cheated)
return FLASH_TIME;
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;
/*
* I'll use 6mm squares by default.
*/
game_compute_size(params, 600, &pw, &ph);
*x = pw / 100.0;
*y = ph / 100.0;
}
static void game_print(drawing *dr, game_state *state, int tilesize)
{
const int w = state->shared->params.w;
const int h = state->shared->params.h;
int c, i, borders;
/* Ick: fake up `ds->tilesize' for macro expansion purposes */
game_drawstate *ds = game_new_drawstate(dr, state);
game_set_size(dr, ds, NULL, tilesize);
c = print_mono_colour(dr, 1); assert(c == COL_BACKGROUND);
c = print_mono_colour(dr, 0); assert(c == COL_GRID);
c = print_mono_colour(dr, 1); assert(c == COL_HIGHLIGHT);
c = print_mono_colour(dr, 1); assert(c == COL_CORRECT);
c = print_mono_colour(dr, 1); assert(c == COL_ERROR);
c = print_mono_colour(dr, 0); assert(c == COL_USER);
/*
* Border.
*/
draw_rect(dr, BORDER - BORDER_WIDTH, BORDER - BORDER_WIDTH,
w*TILE_SIZE + 2*BORDER_WIDTH + 1,
h*TILE_SIZE + 2*BORDER_WIDTH + 1,
COL_GRID);
/*
* We'll draw borders between the ominoes iff the grid is not
* pristine. So scan it to see if it is.
*/
borders = FALSE;
for (i = 0; i < w*h; i++)
if (state->board[i] && !state->shared->clues[i])
borders = TRUE;
/*
* Draw grid.
*/
print_line_width(dr, TILE_SIZE / 64);
draw_grid(dr, ds, state, NULL, FALSE, borders, FALSE);
/*
* Clean up.
*/
game_free_drawstate(dr, ds);
}
#ifdef COMBINED
#define thegame filling
#endif
const struct game thegame = {
"Filling", "games.filling", "filling",
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_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_NUMPAD, /* flags */
};
#ifdef STANDALONE_SOLVER /* solver? hah! */
int main(int argc, char **argv) {
while (*++argv) {
game_params *params;
game_state *state;
char *par;
char *desc;
for (par = desc = *argv; *desc != '\0' && *desc != ':'; ++desc);
if (*desc == '\0') {
fprintf(stderr, "bad puzzle id: %s", par);
continue;
}
*desc++ = '\0';
params = snew(game_params);
decode_params(params, par);
state = new_game(NULL, params, desc);
if (solver(state->board, params->w, params->h, NULL))
printf("%s:%s: solvable\n", par, desc);
else
printf("%s:%s: not solvable\n", par, desc);
}
return 0;
}
#endif
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