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puzzles/singles.c
Ben Harris 5ec86c03a8 move_cursor(): handle visible flag; return useful value 
This adds an extra parameter to move_cursor() that's an optional pointer
to a bool indicating whether the cursor is visible.  This allows for
centralising the common idiom of having the keyboard cursor become
visible when a cursor key is pressed.  Consistently with the vast
majority of existing puzzles, the cursor moves even if it was invisible
before, and becomes visible even if it can't move.

The function now also returns one of the special constants that can be
returned by interpret_move(), so that the caller can correctly return
MOVE_UI_UPDATE or MOVE_NO_EFFECT without needing to carefully check for
changes itself.

Callers are updated only to the extent that they all pass NULL as the
new argument.  Most of them could now be substantially simplified.
2023-08-09 11:44:25 +01:00

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/*
* singles.c: implementation of Hitori ('let me alone') from Nikoli.
*
* Make single-get able to fetch a specific puzzle ID from menneske.no?
*
* www.menneske.no solving methods:
*
* Done:
* SC: if you circle a cell, any cells in same row/col with same no --> black
* -- solver_op_circle
* SB: if you make a cell black, any cells around it --> white
* -- solver_op_blacken
* ST: 3 identical cells in row, centre is white and outer two black.
* SP: 2 identical cells with single-cell gap, middle cell is white.
* -- solver_singlesep (both ST and SP)
* PI: if you have a pair of same number in row/col, any other
* cells of same number must be black.
* -- solve_doubles
* CC: if you have a black on edge one cell away from corner, cell
* on edge diag. adjacent must be white.
* CE: if you have 2 black cells of triangle on edge, third cell must
* be white.
* QM: if you have 3 black cells of diagonal square in middle, fourth
* cell must be white.
* -- solve_allblackbutone (CC, CE, and QM).
* QC: a corner with 4 identical numbers (or 2 and 2) must have the
* corner cell (and cell diagonal to that) black.
* TC: a corner with 3 identical numbers (with the L either way)
* must have the apex of L black, and other two white.
* DC: a corner with 2 identical numbers in domino can set a white
* cell along wall.
* -- solve_corners (QC, TC, DC)
* IP: pair with one-offset-pair force whites by offset pair
* -- solve_offsetpair
* MC: any cells diag. adjacent to black cells that would split board
* into separate white regions must be white.
* -- solve_removesplits
*
* Still to do:
*
* TEP: 3 pairs of dominos parallel to side, can mark 4 white cells
* alongside.
* DEP: 2 pairs of dominos parallel to side, can mark 2 white cells.
* FI: if you have two sets of double-cells packed together, singles
* in that row/col must be white (qv. PI)
* QuM: four identical cells (or 2 and 2) in middle of grid only have
* two possible solutions each.
* FDE: doubles one row/column away from edge can force a white cell.
* FDM: doubles in centre (next to bits of diag. square) can force a white cell.
* MP: two pairs with same number between force number to black.
* CnC: if circling a cell leads to impossible board, cell is black.
* MC: if we have two possiblilities, can we force a white circle?
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>
#ifdef NO_TGMATH_H
# include <math.h>
#else
# include <tgmath.h>
#endif
#include "puzzles.h"
#include "latin.h"
#ifdef STANDALONE_SOLVER
static bool verbose = false;
#endif
#define PREFERRED_TILE_SIZE 32
#define TILE_SIZE (ds->tilesize)
#define BORDER (TILE_SIZE / 2)
#define CRAD ((TILE_SIZE / 2) - 1)
#define TEXTSZ ((14*CRAD/10) - 1) /* 2 * sqrt(2) of CRAD */
#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_TIME 0.7F
enum {
COL_BACKGROUND, COL_UNUSED1, COL_LOWLIGHT,
COL_BLACK, COL_WHITE, COL_BLACKNUM, COL_GRID,
COL_CURSOR, COL_ERROR,
NCOLOURS
};
struct game_params {
int w, h, diff;
};
#define F_BLACK 0x1
#define F_CIRCLE 0x2
#define F_ERROR 0x4
#define F_SCRATCH 0x8
struct game_state {
int w, h, n, o; /* n = w*h; o = max(w, h) */
bool completed, used_solve, impossible;
int *nums; /* size w*h */
unsigned int *flags; /* size w*h */
};
/* top, right, bottom, left */
static const int dxs[4] = { 0, 1, 0, -1 };
static const int dys[4] = { -1, 0, 1, 0 };
/* --- Game parameters and preset functions --- */
#define DIFFLIST(A) \
A(EASY,Easy,e) \
A(TRICKY,Tricky,k)
#define ENUM(upper,title,lower) DIFF_ ## upper,
#define TITLE(upper,title,lower) #title,
#define ENCODE(upper,title,lower) #lower
#define CONFIG(upper,title,lower) ":" #title
enum { DIFFLIST(ENUM) DIFF_MAX, DIFF_ANY };
static char const *const singles_diffnames[] = { DIFFLIST(TITLE) };
static char const singles_diffchars[] = DIFFLIST(ENCODE);
#define DIFFCOUNT lenof(singles_diffchars)
#define DIFFCONFIG DIFFLIST(CONFIG)
static game_params *default_params(void)
{
game_params *ret = snew(game_params);
ret->w = ret->h = 5;
ret->diff = DIFF_EASY;
return ret;
}
static const struct game_params singles_presets[] = {
{ 5, 5, DIFF_EASY },
{ 5, 5, DIFF_TRICKY },
{ 6, 6, DIFF_EASY },
{ 6, 6, DIFF_TRICKY },
{ 8, 8, DIFF_EASY },
{ 8, 8, DIFF_TRICKY },
{ 10, 10, DIFF_EASY },
{ 10, 10, DIFF_TRICKY },
{ 12, 12, DIFF_EASY },
{ 12, 12, DIFF_TRICKY }
};
static bool game_fetch_preset(int i, char **name, game_params **params)
{
game_params *ret;
char buf[80];
if (i < 0 || i >= lenof(singles_presets))
return false;
ret = default_params();
*ret = singles_presets[i];
*params = ret;
sprintf(buf, "%dx%d %s", ret->w, ret->h, singles_diffnames[ret->diff]);
*name = dupstr(buf);
return true;
}
static void free_params(game_params *params)
{
sfree(params);
}
static game_params *dup_params(const 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)
{
char const *p = string;
int i;
ret->w = ret->h = atoi(p);
while (*p && isdigit((unsigned char)*p)) p++;
if (*p == 'x') {
p++;
ret->h = atoi(p);
while (*p && isdigit((unsigned char)*p)) p++;
}
if (*p == 'd') {
ret->diff = DIFF_MAX; /* which is invalid */
p++;
for (i = 0; i < DIFFCOUNT; i++) {
if (*p == singles_diffchars[i])
ret->diff = i;
}
p++;
}
}
static char *encode_params(const game_params *params, bool full)
{
char data[256];
if (full)
sprintf(data, "%dx%dd%c", params->w, params->h, singles_diffchars[params->diff]);
else
sprintf(data, "%dx%d", params->w, params->h);
return dupstr(data);
}
static config_item *game_configure(const 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].u.string.sval = dupstr(buf);
ret[1].name = "Height";
ret[1].type = C_STRING;
sprintf(buf, "%d", params->h);
ret[1].u.string.sval = dupstr(buf);
ret[2].name = "Difficulty";
ret[2].type = C_CHOICES;
ret[2].u.choices.choicenames = DIFFCONFIG;
ret[2].u.choices.selected = params->diff;
ret[3].name = NULL;
ret[3].type = C_END;
return ret;
}
static game_params *custom_params(const config_item *cfg)
{
game_params *ret = snew(game_params);
ret->w = atoi(cfg[0].u.string.sval);
ret->h = atoi(cfg[1].u.string.sval);
ret->diff = cfg[2].u.choices.selected;
return ret;
}
static const char *validate_params(const game_params *params, bool full)
{
if (params->w < 2 || params->h < 2)
return "Width and neight must be at least two";
if (params->w > 10+26+26 || params->h > 10+26+26)
return "Puzzle is too large";
if (full) {
if (params->diff < 0 || params->diff >= DIFF_MAX)
return "Unknown difficulty rating";
}
return NULL;
}
/* --- Game description string generation and unpicking --- */
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->o = max(w,h);
state->completed = false;
state->used_solve = false;
state->impossible = false;
state->nums = snewn(state->n, int);
state->flags = snewn(state->n, unsigned int);
memset(state->nums, 0, state->n*sizeof(int));
memset(state->flags, 0, state->n*sizeof(unsigned int));
return state;
}
static game_state *dup_game(const game_state *state)
{
game_state *ret = blank_game(state->w, state->h);
ret->completed = state->completed;
ret->used_solve = state->used_solve;
ret->impossible = state->impossible;
memcpy(ret->nums, state->nums, state->n*sizeof(int));
memcpy(ret->flags, state->flags, state->n*sizeof(unsigned int));
return ret;
}
static void free_game(game_state *state)
{
sfree(state->nums);
sfree(state->flags);
sfree(state);
}
static char n2c(int num) {
if (num < 10)
return '0' + num;
else if (num < 10+26)
return 'a' + num - 10;
else
return 'A' + num - 10 - 26;
return '?';
}
static int c2n(char c) {
if (isdigit((unsigned char)c))
return (int)(c - '0');
else if (c >= 'a' && c <= 'z')
return (int)(c - 'a' + 10);
else if (c >= 'A' && c <= 'Z')
return (int)(c - 'A' + 10 + 26);
return -1;
}
static void unpick_desc(const game_params *params, const char *desc,
game_state **sout, const char **mout)
{
game_state *state = blank_game(params->w, params->h);
const char *msg = NULL;
int num = 0, i = 0;
if (strlen(desc) != state->n) {
msg = "Game description is wrong length";
goto done;
}
for (i = 0; i < state->n; i++) {
num = c2n(desc[i]);
if (num <= 0 || num > state->o) {
msg = "Game description contains unexpected characters";
goto done;
}
state->nums[i] = num;
}
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, bool issolve)
{
char *ret = snewn(state->n+1+(issolve?1:0), char);
int i, p=0;
if (issolve)
ret[p++] = 'S';
for (i = 0; i < state->n; i++)
ret[p++] = n2c(state->nums[i]);
ret[p] = '\0';
return ret;
}
/* --- Useful game functions (completion, etc.) --- */
static bool game_can_format_as_text_now(const game_params *params)
{
return true;
}
static char *game_text_format(const game_state *state)
{
int len, x, y, i;
char *ret, *p;
len = (state->w)*2; /* one row ... */
len = len * (state->h*2); /* ... h rows, including gaps ... */
len += 1; /* ... final NL */
p = ret = snewn(len, char);
for (y = 0; y < state->h; y++) {
for (x = 0; x < state->w; x++) {
i = y*state->w + x;
if (x > 0) *p++ = ' ';
*p++ = (state->flags[i] & F_BLACK) ? '*' : n2c(state->nums[i]);
}
*p++ = '\n';
for (x = 0; x < state->w; x++) {
i = y*state->w + x;
if (x > 0) *p++ = ' ';
*p++ = (state->flags[i] & F_CIRCLE) ? '~' : ' ';
}
*p++ = '\n';
}
*p++ = '\0';
assert(p - ret == len);
return ret;
}
static void debug_state(const char *desc, game_state *state) {
char *dbg = game_text_format(state);
debug(("%s:\n%s", desc, dbg));
sfree(dbg);
}
static void connect_if_same(game_state *state, DSF *dsf, int i1, int i2)
{
int c1, c2;
if ((state->flags[i1] & F_BLACK) != (state->flags[i2] & F_BLACK))
return;
c1 = dsf_canonify(dsf, i1);
c2 = dsf_canonify(dsf, i2);
dsf_merge(dsf, c1, c2);
}
static void connect_dsf(game_state *state, DSF *dsf)
{
int x, y, i;
/* Construct a dsf array for connected blocks; connections
* tracked to right and down. */
dsf_reinit(dsf);
for (x = 0; x < state->w; x++) {
for (y = 0; y < state->h; y++) {
i = y*state->w + x;
if (x < state->w-1)
connect_if_same(state, dsf, i, i+1); /* right */
if (y < state->h-1)
connect_if_same(state, dsf, i, i+state->w); /* down */
}
}
}
#define CC_MARK_ERRORS 1
#define CC_MUST_FILL 2
static int check_rowcol(game_state *state, int starti, int di, int sz, unsigned flags)
{
int nerr = 0, n, m, i, j;
/* if any circled numbers have identical non-circled numbers on
* same row/column, error (non-circled)
* if any circled numbers in same column are same number, highlight them.
* if any rows/columns have >1 of same number, not complete. */
for (n = 0, i = starti; n < sz; n++, i += di) {
if (state->flags[i] & F_BLACK) continue;
for (m = n+1, j = i+di; m < sz; m++, j += di) {
if (state->flags[j] & F_BLACK) continue;
if (state->nums[i] != state->nums[j]) continue;
nerr++; /* ok, we have two numbers the same in a row. */
if (!(flags & CC_MARK_ERRORS)) continue;
/* If we have two circles in the same row around
* two identical numbers, they are _both_ wrong. */
if ((state->flags[i] & F_CIRCLE) &&
(state->flags[j] & F_CIRCLE)) {
state->flags[i] |= F_ERROR;
state->flags[j] |= F_ERROR;
}
/* Otherwise, if we have a circle, any other identical
* numbers in that row are obviously wrong. We don't
* highlight this, however, since it makes the process
* of solving the puzzle too easy (you circle a number
* and it promptly tells you which numbers to blacken! */
#if 0
else if (state->flags[i] & F_CIRCLE)
state->flags[j] |= F_ERROR;
else if (state->flags[j] & F_CIRCLE)
state->flags[i] |= F_ERROR;
#endif
}
}
return nerr;
}
static bool check_complete(game_state *state, unsigned flags)
{
DSF *dsf = dsf_new(state->n);
int x, y, i, error = 0, nwhite, w = state->w, h = state->h;
if (flags & CC_MARK_ERRORS) {
for (i = 0; i < state->n; i++)
state->flags[i] &= ~F_ERROR;
}
connect_dsf(state, dsf);
/* If we're the solver we need the grid all to be definitively
* black or definitively white (i.e. circled) otherwise the solver
* has found an ambiguous grid. */
if (flags & CC_MUST_FILL) {
for (i = 0; i < state->n; i++) {
if (!(state->flags[i] & F_BLACK) && !(state->flags[i] & F_CIRCLE))
error += 1;
}
}
/* Mark any black squares in groups of >1 as errors.
* Count number of white squares. */
nwhite = 0;
for (i = 0; i < state->n; i++) {
if (state->flags[i] & F_BLACK) {
if (dsf_size(dsf, i) > 1) {
error += 1;
if (flags & CC_MARK_ERRORS)
state->flags[i] |= F_ERROR;
}
} else
nwhite += 1;
}
/* Check attributes of white squares, row- and column-wise. */
for (x = 0; x < w; x++) /* check cols from (x,0) */
error += check_rowcol(state, x, w, h, flags);
for (y = 0; y < h; y++) /* check rows from (0,y) */
error += check_rowcol(state, y*w, 1, w, flags);
/* If there's more than one white region, pick the largest one to
* be the canonical one (arbitrarily tie-breaking towards lower
* array indices), and mark all the others as erroneous. */
{
int largest = 0, canonical = -1;
for (i = 0; i < state->n; i++)
if (!(state->flags[i] & F_BLACK)) {
int size = dsf_size(dsf, i);
if (largest < size) {
largest = size;
canonical = i;
}
}
if (largest < nwhite) {
for (i = 0; i < state->n; i++)
if (!(state->flags[i] & F_BLACK) &&
dsf_canonify(dsf, i) != canonical) {
error += 1;
if (flags & CC_MARK_ERRORS)
state->flags[i] |= F_ERROR;
}
}
}
dsf_free(dsf);
return !(error > 0);
}
static char *game_state_diff(const game_state *src, const game_state *dst,
bool issolve)
{
char *ret = NULL, buf[80], c;
int retlen = 0, x, y, i, k;
unsigned int fmask = F_BLACK | F_CIRCLE;
assert(src->n == dst->n);
if (issolve) {
ret = sresize(ret, 3, char);
ret[0] = 'S'; ret[1] = ';'; ret[2] = '\0';
retlen += 2;
}
for (x = 0; x < dst->w; x++) {
for (y = 0; y < dst->h; y++) {
i = y*dst->w + x;
if ((src->flags[i] & fmask) != (dst->flags[i] & fmask)) {
assert((dst->flags[i] & fmask) != fmask);
if (dst->flags[i] & F_BLACK)
c = 'B';
else if (dst->flags[i] & F_CIRCLE)
c = 'C';
else
c = 'E';
k = sprintf(buf, "%c%d,%d;", (int)c, x, y);
ret = sresize(ret, retlen + k + 1, char);
strcpy(ret + retlen, buf);
retlen += k;
}
}
}
return ret;
}
/* --- Solver --- */
enum { BLACK, CIRCLE };
struct solver_op {
int x, y, op; /* op one of BLACK or CIRCLE. */
const char *desc; /* must be non-malloced. */
};
struct solver_state {
struct solver_op *ops;
int n_ops, n_alloc;
int *scratch;
};
static struct solver_state *solver_state_new(game_state *state)
{
struct solver_state *ss = snew(struct solver_state);
ss->ops = NULL;
ss->n_ops = ss->n_alloc = 0;
ss->scratch = snewn(state->n, int);
return ss;
}
static void solver_state_free(struct solver_state *ss)
{
sfree(ss->scratch);
if (ss->ops) sfree(ss->ops);
sfree(ss);
}
static void solver_op_add(struct solver_state *ss, int x, int y, int op, const char *desc)
{
struct solver_op *sop;
if (ss->n_alloc < ss->n_ops + 1) {
ss->n_alloc = (ss->n_alloc + 1) * 2;
ss->ops = sresize(ss->ops, ss->n_alloc, struct solver_op);
}
sop = &(ss->ops[ss->n_ops++]);
sop->x = x; sop->y = y; sop->op = op; sop->desc = desc;
debug(("added solver op %s ('%s') at (%d,%d)\n",
op == BLACK ? "BLACK" : "CIRCLE", desc, x, y));
}
static void solver_op_circle(game_state *state, struct solver_state *ss,
int x, int y)
{
int i = y*state->w + x;
if (!INGRID(state, x, y)) return;
if (state->flags[i] & F_BLACK) {
debug(("... solver wants to add auto-circle on black (%d,%d)\n", x, y));
state->impossible = true;
return;
}
/* Only add circle op if it's not already circled. */
if (!(state->flags[i] & F_CIRCLE)) {
solver_op_add(ss, x, y, CIRCLE, "SB - adjacent to black square");
}
}
static void solver_op_blacken(game_state *state, struct solver_state *ss,
int x, int y, int num)
{
int i = y*state->w + x;
if (!INGRID(state, x, y)) return;
if (state->nums[i] != num) return;
if (state->flags[i] & F_CIRCLE) {
debug(("... solver wants to add auto-black on circled(%d,%d)\n", x, y));
state->impossible = true;
return;
}
/* Only add black op if it's not already black. */
if (!(state->flags[i] & F_BLACK)) {
solver_op_add(ss, x, y, BLACK, "SC - number on same row/col as circled");
}
}
static int solver_ops_do(game_state *state, struct solver_state *ss)
{
int next_op = 0, i, x, y, n_ops = 0;
struct solver_op op;
/* Care here: solver_op_* may call solver_op_add which may extend the
* ss->n_ops. */
while (next_op < ss->n_ops) {
op = ss->ops[next_op++]; /* copy this away, it may get reallocated. */
i = op.y*state->w + op.x;
if (op.op == BLACK) {
if (state->flags[i] & F_CIRCLE) {
debug(("Solver wants to blacken circled square (%d,%d)!\n", op.x, op.y));
state->impossible = true;
return n_ops;
}
if (!(state->flags[i] & F_BLACK)) {
debug(("... solver adding black at (%d,%d): %s\n", op.x, op.y, op.desc));
#ifdef STANDALONE_SOLVER
if (verbose)
printf("Adding black at (%d,%d): %s\n", op.x, op.y, op.desc);
#endif
state->flags[i] |= F_BLACK;
/*debug_state("State after adding black", state);*/
n_ops++;
solver_op_circle(state, ss, op.x-1, op.y);
solver_op_circle(state, ss, op.x+1, op.y);
solver_op_circle(state, ss, op.x, op.y-1);
solver_op_circle(state, ss, op.x, op.y+1);
}
} else {
if (state->flags[i] & F_BLACK) {
debug(("Solver wants to circle blackened square (%d,%d)!\n", op.x, op.y));
state->impossible = true;
return n_ops;
}
if (!(state->flags[i] & F_CIRCLE)) {
debug(("... solver adding circle at (%d,%d): %s\n", op.x, op.y, op.desc));
#ifdef STANDALONE_SOLVER
if (verbose)
printf("Adding circle at (%d,%d): %s\n", op.x, op.y, op.desc);
#endif
state->flags[i] |= F_CIRCLE;
/*debug_state("State after adding circle", state);*/
n_ops++;
for (x = 0; x < state->w; x++) {
if (x != op.x)
solver_op_blacken(state, ss, x, op.y, state->nums[i]);
}
for (y = 0; y < state->h; y++) {
if (y != op.y)
solver_op_blacken(state, ss, op.x, y, state->nums[i]);
}
}
}
}
ss->n_ops = 0;
return n_ops;
}
/* If the grid has two identical numbers with one cell between them, the inner
* cell _must_ be white (and thus circled); (at least) one of the two must be
* black (since they're in the same column or row) and thus the middle cell is
* next to a black cell. */
static int solve_singlesep(game_state *state, struct solver_state *ss)
{
int x, y, i, ir, irr, id, idd, n_ops = ss->n_ops;
for (x = 0; x < state->w; x++) {
for (y = 0; y < state->h; y++) {
i = y*state->w + x;
/* Cell two to our right? */
ir = i + 1; irr = ir + 1;
if (x < (state->w-2) &&
state->nums[i] == state->nums[irr] &&
!(state->flags[ir] & F_CIRCLE)) {
solver_op_add(ss, x+1, y, CIRCLE, "SP/ST - between identical nums");
}
/* Cell two below us? */
id = i + state->w; idd = id + state->w;
if (y < (state->h-2) &&
state->nums[i] == state->nums[idd] &&
!(state->flags[id] & F_CIRCLE)) {
solver_op_add(ss, x, y+1, CIRCLE, "SP/ST - between identical nums");
}
}
}
return ss->n_ops - n_ops;
}
/* If we have two identical numbers next to each other (in a row or column),
* any other identical numbers in that column must be black. */
static int solve_doubles(game_state *state, struct solver_state *ss)
{
int x, y, i, ii, n_ops = ss->n_ops, xy;
for (y = 0, i = 0; y < state->h; y++) {
for (x = 0; x < state->w; x++, i++) {
assert(i == y*state->w+x);
if (state->flags[i] & F_BLACK) continue;
ii = i+1; /* check cell to our right. */
if (x < (state->w-1) &&
!(state->flags[ii] & F_BLACK) &&
state->nums[i] == state->nums[ii]) {
for (xy = 0; xy < state->w; xy++) {
if (xy == x || xy == (x+1)) continue;
if (state->nums[y*state->w + xy] == state->nums[i] &&
!(state->flags[y*state->w + xy] & F_BLACK))
solver_op_add(ss, xy, y, BLACK, "PI - same row as pair");
}
}
ii = i+state->w; /* check cell below us */
if (y < (state->h-1) &&
!(state->flags[ii] & F_BLACK) &&
state->nums[i] == state->nums[ii]) {
for (xy = 0; xy < state->h; xy++) {
if (xy == y || xy == (y+1)) continue;
if (state->nums[xy*state->w + x] == state->nums[i] &&
!(state->flags[xy*state->w + x] & F_BLACK))
solver_op_add(ss, x, xy, BLACK, "PI - same col as pair");
}
}
}
}
return ss->n_ops - n_ops;
}
/* If a white square has all-but-one possible adjacent squares black, the
* one square left over must be white. */
static int solve_allblackbutone(game_state *state, struct solver_state *ss)
{
int x, y, i, n_ops = ss->n_ops, xd, yd, id, ifree;
int dis[4], d;
dis[0] = -state->w;
dis[1] = 1;
dis[2] = state->w;
dis[3] = -1;
for (y = 0, i = 0; y < state->h; y++) {
for (x = 0; x < state->w; x++, i++) {
assert(i == y*state->w+x);
if (state->flags[i] & F_BLACK) continue;
ifree = -1;
for (d = 0; d < 4; d++) {
xd = x + dxs[d]; yd = y + dys[d]; id = i + dis[d];
if (!INGRID(state, xd, yd)) continue;
if (state->flags[id] & F_CIRCLE)
goto skip; /* this cell already has a way out */
if (!(state->flags[id] & F_BLACK)) {
if (ifree != -1)
goto skip; /* this cell has >1 white cell around it. */
ifree = id;
}
}
if (ifree != -1)
solver_op_add(ss, ifree%state->w, ifree/state->w, CIRCLE,
"CC/CE/QM: white cell with single non-black around it");
else {
debug(("White cell with no escape at (%d,%d)\n", x, y));
state->impossible = true;
return 0;
}
skip: ;
}
}
return ss->n_ops - n_ops;
}
/* If we have 4 numbers the same in a 2x2 corner, the far corner and the
* diagonally-adjacent square must both be black.
* If we have 3 numbers the same in a 2x2 corner, the apex of the L
* thus formed must be black.
* If we have 2 numbers the same in a 2x2 corner, the non-same cell
* one away from the corner must be white. */
static void solve_corner(game_state *state, struct solver_state *ss,
int x, int y, int dx, int dy)
{
int is[4], ns[4], xx, yy, w = state->w;
for (yy = 0; yy < 2; yy++) {
for (xx = 0; xx < 2; xx++) {
is[yy*2+xx] = (y + dy*yy) * w + (x + dx*xx);
ns[yy*2+xx] = state->nums[is[yy*2+xx]];
}
} /* order is now (corner, side 1, side 2, inner) */
if (ns[0] == ns[1] && ns[0] == ns[2] && ns[0] == ns[3]) {
solver_op_add(ss, is[0]%w, is[0]/w, BLACK, "QC: corner with 4 matching");
solver_op_add(ss, is[3]%w, is[3]/w, BLACK, "QC: corner with 4 matching");
} else if (ns[0] == ns[1] && ns[0] == ns[2]) {
/* corner and 2 sides: apex is corner. */
solver_op_add(ss, is[0]%w, is[0]/w, BLACK, "TC: corner apex from 3 matching");
} else if (ns[1] == ns[2] && ns[1] == ns[3]) {
/* side, side, fourth: apex is fourth. */
solver_op_add(ss, is[3]%w, is[3]/w, BLACK, "TC: inside apex from 3 matching");
} else if (ns[0] == ns[1] || ns[1] == ns[3]) {
/* either way here we match the non-identical side. */
solver_op_add(ss, is[2]%w, is[2]/w, CIRCLE, "DC: corner with 2 matching");
} else if (ns[0] == ns[2] || ns[2] == ns[3]) {
/* ditto */
solver_op_add(ss, is[1]%w, is[1]/w, CIRCLE, "DC: corner with 2 matching");
}
}
static int solve_corners(game_state *state, struct solver_state *ss)
{
int n_ops = ss->n_ops;
solve_corner(state, ss, 0, 0, 1, 1);
solve_corner(state, ss, state->w-1, 0, -1, 1);
solve_corner(state, ss, state->w-1, state->h-1, -1, -1);
solve_corner(state, ss, 0, state->h-1, 1, -1);
return ss->n_ops - n_ops;
}
/* If you have the following situation:
* ...
* ...x A x x y A x...
* ...x B x x B y x...
* ...
* then both squares marked 'y' must be white. One of the left-most A or B must
* be white (since two side-by-side black cells are disallowed), which means
* that the corresponding right-most A or B must be black (since you can't
* have two of the same number on one line); thus, the adjacent squares
* to that right-most A or B must be white, which include the two marked 'y'
* in either case.
* Obviously this works in any row or column. It also works if A == B.
* It doesn't work for the degenerate case:
* ...x A A x x
* ...x B y x x
* where the square marked 'y' isn't necessarily white (consider the left-most A
* is black).
*
* */
static void solve_offsetpair_pair(game_state *state, struct solver_state *ss,
int x1, int y1, int x2, int y2)
{
int ox, oy, w = state->w, ax, ay, an, d, dx[2], dy[2], dn, xd, yd;
if (x1 == x2) { /* same column */
ox = 1; oy = 0;
} else {
assert(y1 == y2);
ox = 0; oy = 1;
}
/* We try adjacent to (x1,y1) and the two diag. adjacent to (x2, y2).
* We expect to be called twice, once each way around. */
ax = x1+ox; ay = y1+oy;
assert(INGRID(state, ax, ay));
an = state->nums[ay*w + ax];
dx[0] = x2 + ox + oy; dx[1] = x2 + ox - oy;
dy[0] = y2 + oy + ox; dy[1] = y2 + oy - ox;
for (d = 0; d < 2; d++) {
if (INGRID(state, dx[d], dy[d]) && (dx[d] != ax || dy[d] != ay)) {
/* The 'dx != ax || dy != ay' removes the degenerate case,
* mentioned above. */
dn = state->nums[dy[d]*w + dx[d]];
if (an == dn) {
/* We have a match; so (WLOG) the 'A' marked above are at
* (x1,y1) and (x2,y2), and the 'B' are at (ax,ay) and (dx,dy). */
debug(("Found offset-pair: %d at (%d,%d) and (%d,%d)\n",
state->nums[y1*w + x1], x1, y1, x2, y2));
debug((" and: %d at (%d,%d) and (%d,%d)\n",
an, ax, ay, dx[d], dy[d]));
xd = dx[d] - x2; yd = dy[d] - y2;
solver_op_add(ss, x2 + xd, y2, CIRCLE, "IP: next to offset-pair");
solver_op_add(ss, x2, y2 + yd, CIRCLE, "IP: next to offset-pair");
}
}
}
}
static int solve_offsetpair(game_state *state, struct solver_state *ss)
{
int n_ops = ss->n_ops, x, xx, y, yy, n1, n2;
for (x = 0; x < state->w-1; x++) {
for (y = 0; y < state->h; y++) {
n1 = state->nums[y*state->w + x];
for (yy = y+1; yy < state->h; yy++) {
n2 = state->nums[yy*state->w + x];
if (n1 == n2) {
solve_offsetpair_pair(state, ss, x, y, x, yy);
solve_offsetpair_pair(state, ss, x, yy, x, y);
}
}
}
}
for (y = 0; y < state->h-1; y++) {
for (x = 0; x < state->w; x++) {
n1 = state->nums[y*state->w + x];
for (xx = x+1; xx < state->w; xx++) {
n2 = state->nums[y*state->w + xx];
if (n1 == n2) {
solve_offsetpair_pair(state, ss, x, y, xx, y);
solve_offsetpair_pair(state, ss, xx, y, x, y);
}
}
}
}
return ss->n_ops - n_ops;
}
static bool solve_hassinglewhiteregion(
game_state *state, struct solver_state *ss)
{
int i, j, nwhite = 0, lwhite = -1, szwhite, start, end, next, a, d, x, y;
for (i = 0; i < state->n; i++) {
if (!(state->flags[i] & F_BLACK)) {
nwhite++;
lwhite = i;
}
state->flags[i] &= ~F_SCRATCH;
}
if (lwhite == -1) {
debug(("solve_hassinglewhite: no white squares found!\n"));
state->impossible = true;
return false;
}
/* We don't use connect_dsf here; it's too slow, and there's a quicker
* algorithm if all we want is the size of one region. */
/* Having written this, this algorithm is only about 5% faster than
* using a dsf. */
memset(ss->scratch, -1, state->n * sizeof(int));
ss->scratch[0] = lwhite;
state->flags[lwhite] |= F_SCRATCH;
start = 0; end = next = 1;
while (start < end) {
for (a = start; a < end; a++) {
i = ss->scratch[a]; assert(i != -1);
for (d = 0; d < 4; d++) {
x = (i % state->w) + dxs[d];
y = (i / state->w) + dys[d];
j = y*state->w + x;
if (!INGRID(state, x, y)) continue;
if (state->flags[j] & (F_BLACK | F_SCRATCH)) continue;
ss->scratch[next++] = j;
state->flags[j] |= F_SCRATCH;
}
}
start = end; end = next;
}
szwhite = next;
return (szwhite == nwhite);
}
static void solve_removesplits_check(game_state *state, struct solver_state *ss,
int x, int y)
{
int i = y*state->w + x;
bool issingle;
if (!INGRID(state, x, y)) return;
if ((state->flags[i] & F_CIRCLE) || (state->flags[i] & F_BLACK))
return;
/* If putting a black square at (x,y) would make the white region
* non-contiguous, it must be circled. */
state->flags[i] |= F_BLACK;
issingle = solve_hassinglewhiteregion(state, ss);
state->flags[i] &= ~F_BLACK;
if (!issingle)
solver_op_add(ss, x, y, CIRCLE, "MC: black square here would split white region");
}
/* For all black squares, search in squares diagonally adjacent to see if
* we can rule out putting a black square there (because it would make the
* white region non-contiguous). */
/* This function is likely to be somewhat slow. */
static int solve_removesplits(game_state *state, struct solver_state *ss)
{
int i, x, y, n_ops = ss->n_ops;
if (!solve_hassinglewhiteregion(state, ss)) {
debug(("solve_removesplits: white region is not contiguous at start!\n"));
state->impossible = true;
return 0;
}
for (i = 0; i < state->n; i++) {
if (!(state->flags[i] & F_BLACK)) continue;
x = i%state->w; y = i/state->w;
solve_removesplits_check(state, ss, x-1, y-1);
solve_removesplits_check(state, ss, x+1, y-1);
solve_removesplits_check(state, ss, x+1, y+1);
solve_removesplits_check(state, ss, x-1, y+1);
}
return ss->n_ops - n_ops;
}
/*
* This function performs a solver step that isn't implicit in the rules
* of the game and is thus treated somewhat differently.
*
* It marks cells whose number does not exist elsewhere in its row/column
* with circles. As it happens the game generator here does mean that this
* is always correct, but it's a solving method that people should not have
* to rely upon (except in the hidden 'sneaky' difficulty setting) and so
* all grids at 'tricky' and above are checked to make sure that the grid
* is no easier if this solving step is performed beforehand.
*
* Calling with ss=NULL just returns the number of sneaky deductions that
* would have been made.
*/
static int solve_sneaky(game_state *state, struct solver_state *ss)
{
int i, ii, x, xx, y, yy, nunique = 0;
/* Clear SCRATCH flags. */
for (i = 0; i < state->n; i++) state->flags[i] &= ~F_SCRATCH;
for (x = 0; x < state->w; x++) {
for (y = 0; y < state->h; y++) {
i = y*state->w + x;
/* Check for duplicate numbers on our row, mark (both) if so */
for (xx = x; xx < state->w; xx++) {
ii = y*state->w + xx;
if (i == ii) continue;
if (state->nums[i] == state->nums[ii]) {
state->flags[i] |= F_SCRATCH;
state->flags[ii] |= F_SCRATCH;
}
}
/* Check for duplicate numbers on our col, mark (both) if so */
for (yy = y; yy < state->h; yy++) {
ii = yy*state->w + x;
if (i == ii) continue;
if (state->nums[i] == state->nums[ii]) {
state->flags[i] |= F_SCRATCH;
state->flags[ii] |= F_SCRATCH;
}
}
}
}
/* Any cell with no marking has no duplicates on its row or column:
* set its CIRCLE. */
for (i = 0; i < state->n; i++) {
if (!(state->flags[i] & F_SCRATCH)) {
if (ss) solver_op_add(ss, i%state->w, i/state->w, CIRCLE,
"SNEAKY: only one of its number in row and col");
nunique += 1;
} else
state->flags[i] &= ~F_SCRATCH;
}
return nunique;
}
static int solve_specific(game_state *state, int diff, bool sneaky)
{
struct solver_state *ss = solver_state_new(state);
if (sneaky) solve_sneaky(state, ss);
/* Some solver operations we only have to perform once --
* they're only based on the numbers available, and not black
* squares or circles which may be added later. */
solve_singlesep(state, ss); /* never sets impossible */
solve_doubles(state, ss); /* ditto */
solve_corners(state, ss); /* ditto */
if (diff >= DIFF_TRICKY)
solve_offsetpair(state, ss); /* ditto */
while (1) {
if (ss->n_ops > 0) solver_ops_do(state, ss);
if (state->impossible) break;
if (solve_allblackbutone(state, ss) > 0) continue;
if (state->impossible) break;
if (diff >= DIFF_TRICKY) {
if (solve_removesplits(state, ss) > 0) continue;
if (state->impossible) break;
}
break;
}
solver_state_free(ss);
return state->impossible ? -1 : check_complete(state, CC_MUST_FILL);
}
static char *solve_game(const game_state *state, const game_state *currstate,
const char *aux, const char **error)
{
game_state *solved = dup_game(currstate);
char *move = NULL;
if (solve_specific(solved, DIFF_ANY, false) > 0) goto solved;
free_game(solved);
solved = dup_game(state);
if (solve_specific(solved, DIFF_ANY, false) > 0) goto solved;
free_game(solved);
*error = "Unable to solve puzzle.";
return NULL;
solved:
move = game_state_diff(currstate, solved, true);
free_game(solved);
return move;
}
/* --- Game generation --- */
/* A correctly completed Hitori board is essentially a latin square
* (no duplicated numbers in any row or column) with black squares
* added such that no black square touches another, and the white
* squares make a contiguous region.
*
* So we can generate it by:
* constructing a latin square
* adding black squares at random (minding the constraints)
* altering the numbers under the new black squares such that
the solver gets a headstart working out where they are.
*/
static bool new_game_is_good(const game_params *params,
game_state *state, game_state *tosolve)
{
int sret, sret_easy = 0;
memcpy(tosolve->nums, state->nums, state->n * sizeof(int));
memset(tosolve->flags, 0, state->n * sizeof(unsigned int));
tosolve->completed = false;
tosolve->impossible = false;
/*
* We try and solve it twice, once at our requested difficulty level
* (ensuring it's soluble at all) and once at the level below (if
* it exists), which we hope to fail: if you can also solve it at
* the level below then it's too easy and we have to try again.
*
* With this puzzle in particular there's an extra finesse, which is
* that we check that the generated puzzle isn't too easy _with
* an extra solver step first_, which is the 'sneaky' mode of deductions
* (asserting that any number which fulfils the latin-square rules
* on its row/column must be white). This is an artefact of the
* generation process and not implicit in the rules, so we don't want
* people to be able to use it to make the puzzle easier.
*/
assert(params->diff < DIFF_MAX);
sret = solve_specific(tosolve, params->diff, false);
if (params->diff > DIFF_EASY) {
memset(tosolve->flags, 0, state->n * sizeof(unsigned int));
tosolve->completed = false;
tosolve->impossible = false;
/* this is the only time the 'sneaky' flag is set. */
sret_easy = solve_specific(tosolve, params->diff-1, true);
}
if (sret <= 0 || sret_easy > 0) {
debug(("Generated puzzle %s at chosen difficulty %s\n",
sret <= 0 ? "insoluble" : "too easy",
singles_diffnames[params->diff]));
return false;
}
return true;
}
#define MAXTRIES 20
static int best_black_col(game_state *state, random_state *rs, int *scratch,
int i, int *rownums, int *colnums)
{
int w = state->w, x = i%w, y = i/w, j, o = state->o;
/* Randomise the list of numbers to try. */
for (i = 0; i < o; i++) scratch[i] = i;
shuffle(scratch, o, sizeof(int), rs);
/* Try each number in turn, first giving preference to removing
* latin-square characteristics (i.e. those numbers which only
* occur once in a row/column). The '&&' here, although intuitively
* wrong, results in a smaller number of 'sneaky' deductions on
* solvable boards. */
for (i = 0; i < o; i++) {
j = scratch[i] + 1;
if (rownums[y*o + j-1] == 1 && colnums[x*o + j-1] == 1)
goto found;
}
/* Then try each number in turn returning the first one that's
* not actually unique in its row/column (see comment below) */
for (i = 0; i < o; i++) {
j = scratch[i] + 1;
if (rownums[y*o + j-1] != 0 || colnums[x*o + j-1] != 0)
goto found;
}
assert(!"unable to place number under black cell.");
return 0;
found:
/* Update column and row counts assuming this number will be placed. */
rownums[y*o + j-1] += 1;
colnums[x*o + j-1] += 1;
return j;
}
static char *new_game_desc(const game_params *params, random_state *rs,
char **aux, bool interactive)
{
game_state *state = blank_game(params->w, params->h);
game_state *tosolve = blank_game(params->w, params->h);
int i, j, *scratch, *rownums, *colnums, x, y, ntries;
int w = state->w, h = state->h, o = state->o;
char *ret;
digit *latin;
struct solver_state *ss = solver_state_new(state);
scratch = snewn(state->n, int);
rownums = snewn(h*o, int);
colnums = snewn(w*o, int);
generate:
ss->n_ops = 0;
debug(("Starting game generation, size %dx%d\n", w, h));
memset(state->flags, 0, state->n*sizeof(unsigned int));
/* First, generate the latin rectangle.
* The order of this, o, is max(w,h). */
latin = latin_generate_rect(w, h, rs);
for (i = 0; i < state->n; i++)
state->nums[i] = (int)latin[i];
sfree(latin);
debug_state("State after latin square", state);
/* Add black squares at random, using bits of solver as we go (to lay
* white squares), until we can lay no more blacks. */
for (i = 0; i < state->n; i++)
scratch[i] = i;
shuffle(scratch, state->n, sizeof(int), rs);
for (j = 0; j < state->n; j++) {
i = scratch[j];
if ((state->flags[i] & F_CIRCLE) || (state->flags[i] & F_BLACK)) {
debug(("generator skipping (%d,%d): %s\n", i%w, i/w,
(state->flags[i] & F_CIRCLE) ? "CIRCLE" : "BLACK"));
continue; /* solver knows this must be one or the other already. */
}
/* Add a random black cell... */
solver_op_add(ss, i%w, i/w, BLACK, "Generator: adding random black cell");
solver_ops_do(state, ss);
/* ... and do as well as we know how to lay down whites that are now forced. */
solve_allblackbutone(state, ss);
solver_ops_do(state, ss);
solve_removesplits(state, ss);
solver_ops_do(state, ss);
if (state->impossible) {
debug(("generator made impossible, restarting...\n"));
goto generate;
}
}
debug_state("State after adding blacks", state);
/* Now we know which squares are white and which are black, we lay numbers
* under black squares at random, except that the number must appear in
* white cells at least once more in the same column or row as that [black]
* square. That's necessary to avoid multiple solutions, where blackening
* squares in the finished puzzle becomes optional. We use two arrays:
*
* rownums[ROW * o + NUM-1] is the no. of white cells containing NUM in y=ROW
* colnums[COL * o + NUM-1] is the no. of white cells containing NUM in x=COL
*/
memset(rownums, 0, h*o * sizeof(int));
memset(colnums, 0, w*o * sizeof(int));
for (i = 0; i < state->n; i++) {
if (state->flags[i] & F_BLACK) continue;
j = state->nums[i];
x = i%w; y = i/w;
rownums[y * o + j-1] += 1;
colnums[x * o + j-1] += 1;
}
ntries = 0;
randomise:
for (i = 0; i < state->n; i++) {
if (!(state->flags[i] & F_BLACK)) continue;
state->nums[i] = best_black_col(state, rs, scratch, i, rownums, colnums);
}
debug_state("State after adding numbers", state);
/* DIFF_ANY just returns whatever we first generated, for testing purposes. */
if (params->diff != DIFF_ANY &&
!new_game_is_good(params, state, tosolve)) {
ntries++;
if (ntries > MAXTRIES) {
debug(("Ran out of randomisation attempts, re-generating.\n"));
goto generate;
}
debug(("Re-randomising numbers under black squares.\n"));
goto randomise;
}
ret = generate_desc(state, false);
free_game(tosolve);
free_game(state);
solver_state_free(ss);
sfree(scratch);
sfree(rownums);
sfree(colnums);
return ret;
}
static const char *validate_desc(const game_params *params, const char *desc)
{
const char *ret = NULL;
unpick_desc(params, desc, NULL, &ret);
return ret;
}
static game_state *new_game(midend *me, const game_params *params,
const char *desc)
{
game_state *state = NULL;
unpick_desc(params, desc, &state, NULL);
if (!state) assert(!"new_game failed to unpick");
return state;
}
/* --- Game UI and move routines --- */
struct game_ui {
int cx, cy;
bool cshow, show_black_nums;
};
static game_ui *new_ui(const game_state *state)
{
game_ui *ui = snew(game_ui);
ui->cx = ui->cy = 0;
ui->cshow = getenv_bool("PUZZLES_SHOW_CURSOR", false);
ui->show_black_nums = false;
return ui;
}
static void free_ui(game_ui *ui)
{
sfree(ui);
}
static void game_changed_state(game_ui *ui, const game_state *oldstate,
const game_state *newstate)
{
if (!oldstate->completed && newstate->completed)
ui->cshow = false;
}
static const char *current_key_label(const game_ui *ui,
const game_state *state, int button)
{
if (IS_CURSOR_SELECT(button) && ui->cshow) {
unsigned int f = state->flags[ui->cy * state->w + ui->cx];
if (f & F_BLACK) return "Restore";
if (f & F_CIRCLE) return "Remove";
return button == CURSOR_SELECT ? "Black" : "Circle";
}
return "";
}
#define DS_BLACK 0x1
#define DS_CIRCLE 0x2
#define DS_CURSOR 0x4
#define DS_BLACK_NUM 0x8
#define DS_ERROR 0x10
#define DS_FLASH 0x20
#define DS_IMPOSSIBLE 0x40
struct game_drawstate {
int tilesize;
bool started, solved;
int w, h, n;
unsigned int *flags;
};
static char *interpret_move(const game_state *state, game_ui *ui,
const game_drawstate *ds,
int mx, int my, int button)
{
char buf[80], c;
int i, x = FROMCOORD(mx), y = FROMCOORD(my);
enum { NONE, TOGGLE_BLACK, TOGGLE_CIRCLE, UI } action = NONE;
if (IS_CURSOR_MOVE(button)) {
move_cursor(button, &ui->cx, &ui->cy, state->w, state->h, true, NULL);
ui->cshow = true;
action = UI;
} else if (IS_CURSOR_SELECT(button)) {
x = ui->cx; y = ui->cy;
if (!ui->cshow) {
action = UI;
ui->cshow = true;
}
if (button == CURSOR_SELECT) {
action = TOGGLE_BLACK;
} else if (button == CURSOR_SELECT2) {
action = TOGGLE_CIRCLE;
}
} else if (IS_MOUSE_DOWN(button)) {
if (ui->cshow) {
ui->cshow = false;
action = UI;
}
if (!INGRID(state, x, y)) {
ui->show_black_nums = !ui->show_black_nums;
action = UI; /* this wants to be a per-game option. */
} else if (button == LEFT_BUTTON) {
action = TOGGLE_BLACK;
} else if (button == RIGHT_BUTTON) {
action = TOGGLE_CIRCLE;
}
}
if (action == UI) return MOVE_UI_UPDATE;
if (action == TOGGLE_BLACK || action == TOGGLE_CIRCLE) {
i = y * state->w + x;
if (state->flags[i] & (F_BLACK | F_CIRCLE))
c = 'E';
else
c = (action == TOGGLE_BLACK) ? 'B' : 'C';
sprintf(buf, "%c%d,%d", (int)c, x, y);
return dupstr(buf);
}
return NULL;
}
static game_state *execute_move(const game_state *state, const char *move)
{
game_state *ret = dup_game(state);
int x, y, i, n;
debug(("move: %s\n", move));
while (*move) {
char c = *move;
if (c == 'B' || c == 'C' || c == 'E') {
move++;
if (sscanf(move, "%d,%d%n", &x, &y, &n) != 2 ||
!INGRID(state, x, y))
goto badmove;
i = y*ret->w + x;
ret->flags[i] &= ~(F_CIRCLE | F_BLACK); /* empty first, always. */
if (c == 'B')
ret->flags[i] |= F_BLACK;
else if (c == 'C')
ret->flags[i] |= F_CIRCLE;
move += n;
} else if (c == 'S') {
move++;
ret->used_solve = true;
} else
goto badmove;
if (*move == ';')
move++;
else if (*move)
goto badmove;
}
if (check_complete(ret, CC_MARK_ERRORS)) ret->completed = true;
return ret;
badmove:
free_game(ret);
return NULL;
}
/* ----------------------------------------------------------------------
* Drawing routines.
*/
static void game_compute_size(const game_params *params, int tilesize,
const game_ui *ui, int *x, int *y)
{
/* Ick: fake up `ds->tilesize' for macro expansion purposes */
struct { int tilesize; } 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,
const game_params *params, int tilesize)
{
ds->tilesize = tilesize;
}
static float *game_colours(frontend *fe, int *ncolours)
{
float *ret = snewn(3 * NCOLOURS, float);
int i;
game_mkhighlight(fe, ret, COL_BACKGROUND, -1, COL_LOWLIGHT);
for (i = 0; i < 3; i++) {
ret[COL_BLACK * 3 + i] = 0.0F;
ret[COL_BLACKNUM * 3 + i] = 0.4F;
ret[COL_WHITE * 3 + i] = 1.0F;
ret[COL_GRID * 3 + i] = ret[COL_LOWLIGHT * 3 + i];
ret[COL_UNUSED1 * 3 + i] = 0.0F; /* To placate an assertion. */
}
ret[COL_CURSOR * 3 + 0] = 0.2F;
ret[COL_CURSOR * 3 + 1] = 0.8F;
ret[COL_CURSOR * 3 + 2] = 0.0F;
ret[COL_ERROR * 3 + 0] = 1.0F;
ret[COL_ERROR * 3 + 1] = 0.0F;
ret[COL_ERROR * 3 + 2] = 0.0F;
*ncolours = NCOLOURS;
return ret;
}
static game_drawstate *game_new_drawstate(drawing *dr, const game_state *state)
{
struct game_drawstate *ds = snew(struct game_drawstate);
ds->tilesize = 0;
ds->started = false;
ds->solved = false;
ds->w = state->w;
ds->h = state->h;
ds->n = state->n;
ds->flags = snewn(state->n, unsigned int);
memset(ds->flags, 0, state->n*sizeof(unsigned int));
return ds;
}
static void game_free_drawstate(drawing *dr, game_drawstate *ds)
{
sfree(ds->flags);
sfree(ds);
}
static void tile_redraw(drawing *dr, game_drawstate *ds, int x, int y,
int num, unsigned int f)
{
int tcol, bg, cx, cy, tsz;
bool dnum;
char buf[32];
if (f & DS_BLACK) {
bg = (f & DS_ERROR) ? COL_ERROR : COL_BLACK;
tcol = COL_BLACKNUM;
dnum = (f & DS_BLACK_NUM);
} else {
bg = (f & DS_FLASH) ? COL_LOWLIGHT : COL_BACKGROUND;
tcol = (f & DS_ERROR) ? COL_ERROR : COL_BLACK;
dnum = true;
}
cx = x + TILE_SIZE/2; cy = y + TILE_SIZE/2;
draw_rect(dr, x, y, TILE_SIZE, TILE_SIZE, bg);
draw_rect_outline(dr, x, y, TILE_SIZE, TILE_SIZE,
(f & DS_IMPOSSIBLE) ? COL_ERROR : COL_GRID);
if (f & DS_CIRCLE) {
draw_circle(dr, cx, cy, CRAD, tcol, tcol);
draw_circle(dr, cx, cy, CRAD-1, bg, tcol);
}
if (dnum) {
sprintf(buf, "%d", num);
if (strlen(buf) == 1)
tsz = TEXTSZ;
else
tsz = (CRAD*2 - 1) / strlen(buf);
draw_text(dr, cx, cy, FONT_VARIABLE, tsz,
ALIGN_VCENTRE | ALIGN_HCENTRE, tcol, buf);
}
if (f & DS_CURSOR)
draw_rect_corners(dr, cx, cy, TEXTSZ/2, COL_CURSOR);
draw_update(dr, x, y, TILE_SIZE, TILE_SIZE);
}
static void game_redraw(drawing *dr, game_drawstate *ds,
const game_state *oldstate, const game_state *state,
int dir, const game_ui *ui,
float animtime, float flashtime)
{
int x, y, i, flash;
unsigned int f;
flash = (int)(flashtime * 5 / FLASH_TIME) % 2;
if (!ds->started) {
int wsz = TILE_SIZE * state->w + 2 * BORDER;
int hsz = TILE_SIZE * state->h + 2 * BORDER;
draw_rect_outline(dr, COORD(0)-1, COORD(0)-1,
TILE_SIZE * state->w + 2, TILE_SIZE * state->h + 2,
COL_GRID);
draw_update(dr, 0, 0, wsz, hsz);
}
for (x = 0; x < state->w; x++) {
for (y = 0; y < state->h; y++) {
i = y*state->w + x;
f = 0;
if (flash) f |= DS_FLASH;
if (state->impossible) f |= DS_IMPOSSIBLE;
if (ui->cshow && x == ui->cx && y == ui->cy)
f |= DS_CURSOR;
if (state->flags[i] & F_BLACK) {
f |= DS_BLACK;
if (ui->show_black_nums) f |= DS_BLACK_NUM;
}
if (state->flags[i] & F_CIRCLE)
f |= DS_CIRCLE;
if (state->flags[i] & F_ERROR)
f |= DS_ERROR;
if (!ds->started || ds->flags[i] != f) {
tile_redraw(dr, ds, COORD(x), COORD(y),
state->nums[i], f);
ds->flags[i] = f;
}
}
}
ds->started = true;
}
static float game_anim_length(const game_state *oldstate,
const game_state *newstate, int dir, game_ui *ui)
{
return 0.0F;
}
static float game_flash_length(const game_state *oldstate,
const game_state *newstate, int dir, game_ui *ui)
{
if (!oldstate->completed &&
newstate->completed && !newstate->used_solve)
return FLASH_TIME;
return 0.0F;
}
static void game_get_cursor_location(const game_ui *ui,
const game_drawstate *ds,
const game_state *state,
const game_params *params,
int *x, int *y, int *w, int *h)
{
if(ui->cshow) {
*x = COORD(ui->cx);
*y = COORD(ui->cy);
*w = *h = TILE_SIZE;
}
}
static int game_status(const game_state *state)
{
return state->completed ? +1 : 0;
}
static void game_print_size(const game_params *params, const game_ui *ui,
float *x, float *y)
{
int pw, ph;
/* 8mm squares by default. */
game_compute_size(params, 800, ui, &pw, &ph);
*x = pw / 100.0F;
*y = ph / 100.0F;
}
static void game_print(drawing *dr, const game_state *state, const game_ui *ui,
int tilesize)
{
int ink = print_mono_colour(dr, 0);
int paper = print_mono_colour(dr, 1);
int x, y, ox, oy, i;
char buf[32];
/* Ick: fake up `ds->tilesize' for macro expansion purposes */
game_drawstate ads, *ds = &ads;
game_set_size(dr, ds, NULL, tilesize);
print_line_width(dr, 2 * TILE_SIZE / 40);
for (x = 0; x < state->w; x++) {
for (y = 0; y < state->h; y++) {
ox = COORD(x); oy = COORD(y);
i = y*state->w+x;
if (state->flags[i] & F_BLACK) {
draw_rect(dr, ox, oy, TILE_SIZE, TILE_SIZE, ink);
} else {
draw_rect_outline(dr, ox, oy, TILE_SIZE, TILE_SIZE, ink);
if (state->flags[i] & DS_CIRCLE)
draw_circle(dr, ox+TILE_SIZE/2, oy+TILE_SIZE/2, CRAD,
paper, ink);
sprintf(buf, "%d", state->nums[i]);
draw_text(dr, ox+TILE_SIZE/2, oy+TILE_SIZE/2, FONT_VARIABLE,
TEXTSZ/strlen(buf), ALIGN_VCENTRE | ALIGN_HCENTRE,
ink, buf);
}
}
}
}
#ifdef COMBINED
#define thegame singles
#endif
const struct game thegame = {
"Singles", "games.singles", "singles",
default_params,
game_fetch_preset, NULL,
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,
NULL, NULL, /* get_prefs, set_prefs */
new_ui,
free_ui,
NULL, /* encode_ui */
NULL, /* decode_ui */
NULL, /* game_request_keys */
game_changed_state,
current_key_label,
interpret_move,
execute_move,
PREFERRED_TILE_SIZE, game_compute_size, game_set_size,
game_colours,
game_new_drawstate,
game_free_drawstate,
game_redraw,
game_anim_length,
game_flash_length,
game_get_cursor_location,
game_status,
true, false, game_print_size, game_print,
false, /* wants_statusbar */
false, NULL, /* timing_state */
REQUIRE_RBUTTON, /* flags */
};
#ifdef STANDALONE_SOLVER
#include <time.h>
#include <stdarg.h>
static void start_soak(game_params *p, random_state *rs)
{
time_t tt_start, tt_now, tt_last;
char *desc, *aux;
game_state *s;
int i, n = 0, ndiff[DIFF_MAX], diff, sret, nblack = 0, nsneaky = 0;
tt_start = tt_now = time(NULL);
printf("Soak-testing a %dx%d grid.\n", p->w, p->h);
p->diff = DIFF_ANY;
memset(ndiff, 0, DIFF_MAX * sizeof(int));
while (1) {
n++;
desc = new_game_desc(p, rs, &aux, false);
s = new_game(NULL, p, desc);
nsneaky += solve_sneaky(s, NULL);
for (diff = 0; diff < DIFF_MAX; diff++) {
memset(s->flags, 0, s->n * sizeof(unsigned int));
s->completed = false;
s->impossible = false;
sret = solve_specific(s, diff, false);
if (sret > 0) {
ndiff[diff]++;
break;
} else if (sret < 0)
fprintf(stderr, "Impossible! %s\n", desc);
}
for (i = 0; i < s->n; i++) {
if (s->flags[i] & F_BLACK) nblack++;
}
free_game(s);
sfree(desc);
tt_last = time(NULL);
if (tt_last > tt_now) {
tt_now = tt_last;
printf("%d total, %3.1f/s, bl/sn %3.1f%%/%3.1f%%: ",
n, (double)n / ((double)tt_now - tt_start),
((double)nblack * 100.0) / (double)(n * p->w * p->h),
((double)nsneaky * 100.0) / (double)(n * p->w * p->h));
for (diff = 0; diff < DIFF_MAX; diff++) {
if (diff > 0) printf(", ");
printf("%d (%3.1f%%) %s",
ndiff[diff], (double)ndiff[diff] * 100.0 / (double)n,
singles_diffnames[diff]);
}
printf("\n");
}
}
}
int main(int argc, char **argv)
{
char *id = NULL, *desc, *desc_gen = NULL, *tgame, *aux;
const char *err;
game_state *s = NULL;
game_params *p = NULL;
int soln, ret = 1;
bool soak = false;
time_t seed = time(NULL);
random_state *rs = NULL;
setvbuf(stdout, NULL, _IONBF, 0);
while (--argc > 0) {
char *p = *++argv;
if (!strcmp(p, "-v")) {
verbose = true;
} else if (!strcmp(p, "--soak")) {
soak = true;
} else if (!strcmp(p, "--seed")) {
if (argc == 0) {
fprintf(stderr, "%s: --seed needs an argument", argv[0]);
goto done;
}
seed = (time_t)atoi(*++argv);
argc--;
} else if (*p == '-') {
fprintf(stderr, "%s: unrecognised option `%s'\n", argv[0], p);
return 1;
} else {
id = p;
}
}
rs = random_new((void*)&seed, sizeof(time_t));
if (!id) {
fprintf(stderr, "usage: %s [-v] [--soak] <params> | <game_id>\n", argv[0]);
goto done;
}
desc = strchr(id, ':');
if (desc) *desc++ = '\0';
p = default_params();
decode_params(p, id);
err = validate_params(p, true);
if (err) {
fprintf(stderr, "%s: %s", argv[0], err);
goto done;
}
if (soak) {
if (desc) {
fprintf(stderr, "%s: --soak only needs params, not game desc.\n", argv[0]);
goto done;
}
start_soak(p, rs);
} else {
if (!desc) desc = desc_gen = new_game_desc(p, rs, &aux, false);
err = validate_desc(p, desc);
if (err) {
fprintf(stderr, "%s: %s\n", argv[0], err);
free_params(p);
goto done;
}
s = new_game(NULL, p, desc);
if (verbose) {
tgame = game_text_format(s);
fputs(tgame, stdout);
sfree(tgame);
}
soln = solve_specific(s, DIFF_ANY, false);
tgame = game_text_format(s);
fputs(tgame, stdout);
sfree(tgame);
printf("Game was %s.\n\n",
soln < 0 ? "impossible" : soln > 0 ? "solved" : "not solved");
}
ret = 0;
done:
if (desc_gen) sfree(desc_gen);
if (p) free_params(p);
if (s) free_game(s);
if (rs) random_free(rs);
return ret;
}
#endif
/* vim: set shiftwidth=4 tabstop=8: */
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