ref: 3fbb23e3546c2ac68933c73f3a38388ffc34e33e
dir: /pattern.c/
/*
* pattern.c: the pattern-reconstruction game known as `nonograms'.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>
#include <math.h>
#include "puzzles.h"
enum {
COL_BACKGROUND,
COL_EMPTY,
COL_FULL,
COL_TEXT,
COL_UNKNOWN,
COL_GRID,
COL_CURSOR,
COL_ERROR,
NCOLOURS
};
#define PREFERRED_TILE_SIZE 24
#define TILE_SIZE (ds->tilesize)
#define BORDER (3 * TILE_SIZE / 4)
#define TLBORDER(d) ( (d) / 5 + 2 )
#define GUTTER (TILE_SIZE / 2)
#define FROMCOORD(d, x) \
( ((x) - (BORDER + GUTTER + TILE_SIZE * TLBORDER(d))) / TILE_SIZE )
#define SIZE(d) (2*BORDER + GUTTER + TILE_SIZE * (TLBORDER(d) + (d)))
#define GETTILESIZE(d, w) ((double)w / (2.0 + (double)TLBORDER(d) + (double)(d)))
#define TOCOORD(d, x) (BORDER + GUTTER + TILE_SIZE * (TLBORDER(d) + (x)))
struct game_params {
int w, h;
};
#define GRID_UNKNOWN 2
#define GRID_FULL 1
#define GRID_EMPTY 0
struct game_state {
int w, h;
unsigned char *grid;
int rowsize;
int *rowdata, *rowlen;
int completed, cheated;
};
#define FLASH_TIME 0.13F
static game_params *default_params(void)
{
game_params *ret = snew(game_params);
ret->w = ret->h = 15;
return ret;
}
static const struct game_params pattern_presets[] = {
{10, 10},
{15, 15},
{20, 20},
#ifndef SLOW_SYSTEM
{25, 25},
{30, 30},
#endif
};
static int game_fetch_preset(int i, char **name, game_params **params)
{
game_params *ret;
char str[80];
if (i < 0 || i >= lenof(pattern_presets))
return FALSE;
ret = snew(game_params);
*ret = pattern_presets[i];
sprintf(str, "%dx%d", ret->w, ret->h);
*name = dupstr(str);
*params = ret;
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)
{
char const *p = string;
ret->w = atoi(p);
while (*p && isdigit((unsigned char)*p)) p++;
if (*p == 'x') {
p++;
ret->h = atoi(p);
while (*p && isdigit((unsigned char)*p)) p++;
} else {
ret->h = ret->w;
}
}
static char *encode_params(game_params *params, int full)
{
char ret[400];
int len;
len = sprintf(ret, "%dx%d", params->w, params->h);
assert(len < lenof(ret));
ret[len] = '\0';
return dupstr(ret);
}
static config_item *game_configure(game_params *params)
{
config_item *ret;
char buf[80];
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 <= 0 || params->h <= 0)
return "Width and height must both be greater than zero";
return NULL;
}
/* ----------------------------------------------------------------------
* Puzzle generation code.
*
* For this particular puzzle, it seemed important to me to ensure
* a unique solution. I do this the brute-force way, by having a
* solver algorithm alongside the generator, and repeatedly
* generating a random grid until I find one whose solution is
* unique. It turns out that this isn't too onerous on a modern PC
* provided you keep grid size below around 30. Any offers of
* better algorithms, however, will be very gratefully received.
*
* Another annoyance of this approach is that it limits the
* available puzzles to those solvable by the algorithm I've used.
* My algorithm only ever considers a single row or column at any
* one time, which means it's incapable of solving the following
* difficult example (found by Bella Image around 1995/6, when she
* and I were both doing maths degrees):
*
* 2 1 2 1
*
* +--+--+--+--+
* 1 1 | | | | |
* +--+--+--+--+
* 2 | | | | |
* +--+--+--+--+
* 1 | | | | |
* +--+--+--+--+
* 1 | | | | |
* +--+--+--+--+
*
* Obviously this cannot be solved by a one-row-or-column-at-a-time
* algorithm (it would require at least one row or column reading
* `2 1', `1 2', `3' or `4' to get started). However, it can be
* proved to have a unique solution: if the top left square were
* empty, then the only option for the top row would be to fill the
* two squares in the 1 columns, which would imply the squares
* below those were empty, leaving no place for the 2 in the second
* row. Contradiction. Hence the top left square is full, and the
* unique solution follows easily from that starting point.
*
* (The game ID for this puzzle is 4x4:2/1/2/1/1.1/2/1/1 , in case
* it's useful to anyone.)
*/
static int float_compare(const void *av, const void *bv)
{
const float *a = (const float *)av;
const float *b = (const float *)bv;
if (*a < *b)
return -1;
else if (*a > *b)
return +1;
else
return 0;
}
static void generate(random_state *rs, int w, int h, unsigned char *retgrid)
{
float *fgrid;
float *fgrid2;
int step, i, j;
float threshold;
fgrid = snewn(w*h, float);
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++) {
fgrid[i*w+j] = random_upto(rs, 100000000UL) / 100000000.F;
}
}
/*
* The above gives a completely random splattering of black and
* white cells. We want to gently bias this in favour of _some_
* reasonably thick areas of white and black, while retaining
* some randomness and fine detail.
*
* So we evolve the starting grid using a cellular automaton.
* Currently, I'm doing something very simple indeed, which is
* to set each square to the average of the surrounding nine
* cells (or the average of fewer, if we're on a corner).
*/
for (step = 0; step < 1; step++) {
fgrid2 = snewn(w*h, float);
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++) {
float sx, xbar;
int n, p, q;
/*
* Compute the average of the surrounding cells.
*/
n = 0;
sx = 0.F;
for (p = -1; p <= +1; p++) {
for (q = -1; q <= +1; q++) {
if (i+p < 0 || i+p >= h || j+q < 0 || j+q >= w)
continue;
/*
* An additional special case not mentioned
* above: if a grid dimension is 2xn then
* we do not average across that dimension
* at all. Otherwise a 2x2 grid would
* contain four identical squares.
*/
if ((h==2 && p!=0) || (w==2 && q!=0))
continue;
n++;
sx += fgrid[(i+p)*w+(j+q)];
}
}
xbar = sx / n;
fgrid2[i*w+j] = xbar;
}
}
sfree(fgrid);
fgrid = fgrid2;
}
fgrid2 = snewn(w*h, float);
memcpy(fgrid2, fgrid, w*h*sizeof(float));
qsort(fgrid2, w*h, sizeof(float), float_compare);
threshold = fgrid2[w*h/2];
sfree(fgrid2);
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++) {
retgrid[i*w+j] = (fgrid[i*w+j] >= threshold ? GRID_FULL :
GRID_EMPTY);
}
}
sfree(fgrid);
}
static int compute_rowdata(int *ret, unsigned char *start, int len, int step)
{
int i, n;
n = 0;
for (i = 0; i < len; i++) {
if (start[i*step] == GRID_FULL) {
int runlen = 1;
while (i+runlen < len && start[(i+runlen)*step] == GRID_FULL)
runlen++;
ret[n++] = runlen;
i += runlen;
}
if (i < len && start[i*step] == GRID_UNKNOWN)
return -1;
}
return n;
}
#define UNKNOWN 0
#define BLOCK 1
#define DOT 2
#define STILL_UNKNOWN 3
#ifdef STANDALONE_SOLVER
int verbose = FALSE;
#endif
static void do_recurse(unsigned char *known, unsigned char *deduced,
unsigned char *row, int *data, int len,
int freespace, int ndone, int lowest)
{
int i, j, k;
if (data[ndone]) {
for (i=0; i<=freespace; i++) {
j = lowest;
for (k=0; k<i; k++) row[j++] = DOT;
for (k=0; k<data[ndone]; k++) row[j++] = BLOCK;
if (j < len) row[j++] = DOT;
do_recurse(known, deduced, row, data, len,
freespace-i, ndone+1, j);
}
} else {
for (i=lowest; i<len; i++)
row[i] = DOT;
for (i=0; i<len; i++)
if (known[i] && known[i] != row[i])
return;
for (i=0; i<len; i++)
deduced[i] |= row[i];
}
}
static int do_row(unsigned char *known, unsigned char *deduced,
unsigned char *row,
unsigned char *start, int len, int step, int *data
#ifdef STANDALONE_SOLVER
, const char *rowcol, int index, int cluewid
#endif
)
{
int rowlen, i, freespace, done_any;
freespace = len+1;
for (rowlen = 0; data[rowlen]; rowlen++)
freespace -= data[rowlen]+1;
for (i = 0; i < len; i++) {
known[i] = start[i*step];
deduced[i] = 0;
}
do_recurse(known, deduced, row, data, len, freespace, 0, 0);
done_any = FALSE;
for (i=0; i<len; i++)
if (deduced[i] && deduced[i] != STILL_UNKNOWN && !known[i]) {
start[i*step] = deduced[i];
done_any = TRUE;
}
#ifdef STANDALONE_SOLVER
if (verbose && done_any) {
char buf[80];
int thiscluewid;
printf("%s %2d: [", rowcol, index);
for (thiscluewid = -1, i = 0; data[i]; i++)
thiscluewid += sprintf(buf, " %d", data[i]);
printf("%*s", cluewid - thiscluewid, "");
for (i = 0; data[i]; i++)
printf(" %d", data[i]);
printf(" ] ");
for (i = 0; i < len; i++)
putchar(known[i] == BLOCK ? '#' :
known[i] == DOT ? '.' : '?');
printf(" -> ");
for (i = 0; i < len; i++)
putchar(start[i*step] == BLOCK ? '#' :
start[i*step] == DOT ? '.' : '?');
putchar('\n');
}
#endif
return done_any;
}
static unsigned char *generate_soluble(random_state *rs, int w, int h)
{
int i, j, done_any, ok, ntries, max;
unsigned char *grid, *matrix, *workspace;
int *rowdata;
grid = snewn(w*h, unsigned char);
matrix = snewn(w*h, unsigned char);
max = max(w, h);
workspace = snewn(max*3, unsigned char);
rowdata = snewn(max+1, int);
ntries = 0;
do {
ntries++;
generate(rs, w, h, grid);
/*
* The game is a bit too easy if any row or column is
* completely black or completely white. An exception is
* made for rows/columns that are under 3 squares,
* otherwise nothing will ever be successfully generated.
*/
ok = TRUE;
if (w > 2) {
for (i = 0; i < h; i++) {
int colours = 0;
for (j = 0; j < w; j++)
colours |= (grid[i*w+j] == GRID_FULL ? 2 : 1);
if (colours != 3)
ok = FALSE;
}
}
if (h > 2) {
for (j = 0; j < w; j++) {
int colours = 0;
for (i = 0; i < h; i++)
colours |= (grid[i*w+j] == GRID_FULL ? 2 : 1);
if (colours != 3)
ok = FALSE;
}
}
if (!ok)
continue;
memset(matrix, 0, w*h);
do {
done_any = 0;
for (i=0; i<h; i++) {
rowdata[compute_rowdata(rowdata, grid+i*w, w, 1)] = 0;
done_any |= do_row(workspace, workspace+max, workspace+2*max,
matrix+i*w, w, 1, rowdata
#ifdef STANDALONE_SOLVER
, NULL, 0, 0 /* never do diagnostics here */
#endif
);
}
for (i=0; i<w; i++) {
rowdata[compute_rowdata(rowdata, grid+i, h, w)] = 0;
done_any |= do_row(workspace, workspace+max, workspace+2*max,
matrix+i, h, w, rowdata
#ifdef STANDALONE_SOLVER
, NULL, 0, 0 /* never do diagnostics here */
#endif
);
}
} while (done_any);
ok = TRUE;
for (i=0; i<h; i++) {
for (j=0; j<w; j++) {
if (matrix[i*w+j] == UNKNOWN)
ok = FALSE;
}
}
} while (!ok);
sfree(matrix);
sfree(workspace);
sfree(rowdata);
return grid;
}
static char *new_game_desc(game_params *params, random_state *rs,
char **aux, int interactive)
{
unsigned char *grid;
int i, j, max, rowlen, *rowdata;
char intbuf[80], *desc;
int desclen, descpos;
grid = generate_soluble(rs, params->w, params->h);
max = max(params->w, params->h);
rowdata = snewn(max, int);
/*
* Save the solved game in aux.
*/
{
char *ai = snewn(params->w * params->h + 2, char);
/*
* String format is exactly the same as a solve move, so we
* can just dupstr this in solve_game().
*/
ai[0] = 'S';
for (i = 0; i < params->w * params->h; i++)
ai[i+1] = grid[i] ? '1' : '0';
ai[params->w * params->h + 1] = '\0';
*aux = ai;
}
/*
* Seed is a slash-separated list of row contents; each row
* contents section is a dot-separated list of integers. Row
* contents are listed in the order (columns left to right,
* then rows top to bottom).
*
* Simplest way to handle memory allocation is to make two
* passes, first computing the seed size and then writing it
* out.
*/
desclen = 0;
for (i = 0; i < params->w + params->h; i++) {
if (i < params->w)
rowlen = compute_rowdata(rowdata, grid+i, params->h, params->w);
else
rowlen = compute_rowdata(rowdata, grid+(i-params->w)*params->w,
params->w, 1);
if (rowlen > 0) {
for (j = 0; j < rowlen; j++) {
desclen += 1 + sprintf(intbuf, "%d", rowdata[j]);
}
} else {
desclen++;
}
}
desc = snewn(desclen, char);
descpos = 0;
for (i = 0; i < params->w + params->h; i++) {
if (i < params->w)
rowlen = compute_rowdata(rowdata, grid+i, params->h, params->w);
else
rowlen = compute_rowdata(rowdata, grid+(i-params->w)*params->w,
params->w, 1);
if (rowlen > 0) {
for (j = 0; j < rowlen; j++) {
int len = sprintf(desc+descpos, "%d", rowdata[j]);
if (j+1 < rowlen)
desc[descpos + len] = '.';
else
desc[descpos + len] = '/';
descpos += len+1;
}
} else {
desc[descpos++] = '/';
}
}
assert(descpos == desclen);
assert(desc[desclen-1] == '/');
desc[desclen-1] = '\0';
sfree(rowdata);
sfree(grid);
return desc;
}
static char *validate_desc(game_params *params, char *desc)
{
int i, n, rowspace;
char *p;
for (i = 0; i < params->w + params->h; i++) {
if (i < params->w)
rowspace = params->h + 1;
else
rowspace = params->w + 1;
if (*desc && isdigit((unsigned char)*desc)) {
do {
p = desc;
while (*desc && isdigit((unsigned char)*desc)) desc++;
n = atoi(p);
rowspace -= n+1;
if (rowspace < 0) {
if (i < params->w)
return "at least one column contains more numbers than will fit";
else
return "at least one row contains more numbers than will fit";
}
} while (*desc++ == '.');
} else {
desc++; /* expect a slash immediately */
}
if (desc[-1] == '/') {
if (i+1 == params->w + params->h)
return "too many row/column specifications";
} else if (desc[-1] == '\0') {
if (i+1 < params->w + params->h)
return "too few row/column specifications";
} else
return "unrecognised character in game specification";
}
return NULL;
}
static game_state *new_game(midend *me, game_params *params, char *desc)
{
int i;
char *p;
game_state *state = snew(game_state);
state->w = params->w;
state->h = params->h;
state->grid = snewn(state->w * state->h, unsigned char);
memset(state->grid, GRID_UNKNOWN, state->w * state->h);
state->rowsize = max(state->w, state->h);
state->rowdata = snewn(state->rowsize * (state->w + state->h), int);
state->rowlen = snewn(state->w + state->h, int);
state->completed = state->cheated = FALSE;
for (i = 0; i < params->w + params->h; i++) {
state->rowlen[i] = 0;
if (*desc && isdigit((unsigned char)*desc)) {
do {
p = desc;
while (*desc && isdigit((unsigned char)*desc)) desc++;
state->rowdata[state->rowsize * i + state->rowlen[i]++] =
atoi(p);
} while (*desc++ == '.');
} else {
desc++; /* expect a slash immediately */
}
}
return state;
}
static game_state *dup_game(game_state *state)
{
game_state *ret = snew(game_state);
ret->w = state->w;
ret->h = state->h;
ret->grid = snewn(ret->w * ret->h, unsigned char);
memcpy(ret->grid, state->grid, ret->w * ret->h);
ret->rowsize = state->rowsize;
ret->rowdata = snewn(ret->rowsize * (ret->w + ret->h), int);
ret->rowlen = snewn(ret->w + ret->h, int);
memcpy(ret->rowdata, state->rowdata,
ret->rowsize * (ret->w + ret->h) * sizeof(int));
memcpy(ret->rowlen, state->rowlen,
(ret->w + ret->h) * sizeof(int));
ret->completed = state->completed;
ret->cheated = state->cheated;
return ret;
}
static void free_game(game_state *state)
{
sfree(state->rowdata);
sfree(state->rowlen);
sfree(state->grid);
sfree(state);
}
static char *solve_game(game_state *state, game_state *currstate,
char *ai, char **error)
{
unsigned char *matrix;
int w = state->w, h = state->h;
int i;
char *ret;
int done_any, max;
unsigned char *workspace;
int *rowdata;
/*
* If we already have the solved state in ai, copy it out.
*/
if (ai)
return dupstr(ai);
matrix = snewn(w*h, unsigned char);
max = max(w, h);
workspace = snewn(max*3, unsigned char);
rowdata = snewn(max+1, int);
memset(matrix, 0, w*h);
do {
done_any = 0;
for (i=0; i<h; i++) {
memcpy(rowdata, state->rowdata + state->rowsize*(w+i),
max*sizeof(int));
rowdata[state->rowlen[w+i]] = 0;
done_any |= do_row(workspace, workspace+max, workspace+2*max,
matrix+i*w, w, 1, rowdata
#ifdef STANDALONE_SOLVER
, NULL, 0, 0 /* never do diagnostics here */
#endif
);
}
for (i=0; i<w; i++) {
memcpy(rowdata, state->rowdata + state->rowsize*i, max*sizeof(int));
rowdata[state->rowlen[i]] = 0;
done_any |= do_row(workspace, workspace+max, workspace+2*max,
matrix+i, h, w, rowdata
#ifdef STANDALONE_SOLVER
, NULL, 0, 0 /* never do diagnostics here */
#endif
);
}
} while (done_any);
sfree(workspace);
sfree(rowdata);
for (i = 0; i < w*h; i++) {
if (matrix[i] != BLOCK && matrix[i] != DOT) {
sfree(matrix);
*error = "Solving algorithm cannot complete this puzzle";
return NULL;
}
}
ret = snewn(w*h+2, char);
ret[0] = 'S';
for (i = 0; i < w*h; i++) {
assert(matrix[i] == BLOCK || matrix[i] == DOT);
ret[i+1] = (matrix[i] == BLOCK ? '1' : '0');
}
ret[w*h+1] = '\0';
sfree(matrix);
return ret;
}
static int game_can_format_as_text_now(game_params *params)
{
return TRUE;
}
static char *game_text_format(game_state *state)
{
return NULL;
}
struct game_ui {
int dragging;
int drag_start_x;
int drag_start_y;
int drag_end_x;
int drag_end_y;
int drag, release, state;
int cur_x, cur_y, cur_visible;
};
static game_ui *new_ui(game_state *state)
{
game_ui *ret;
ret = snew(game_ui);
ret->dragging = FALSE;
ret->cur_x = ret->cur_y = ret->cur_visible = 0;
return ret;
}
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)
{
}
struct game_drawstate {
int started;
int w, h;
int tilesize;
unsigned char *visible, *numcolours;
int cur_x, cur_y;
};
static char *interpret_move(game_state *state, game_ui *ui, game_drawstate *ds,
int x, int y, int button)
{
button &= ~MOD_MASK;
x = FROMCOORD(state->w, x);
y = FROMCOORD(state->h, y);
if (x >= 0 && x < state->w && y >= 0 && y < state->h &&
(button == LEFT_BUTTON || button == RIGHT_BUTTON ||
button == MIDDLE_BUTTON)) {
#ifdef STYLUS_BASED
int currstate = state->grid[y * state->w + x];
#endif
ui->dragging = TRUE;
if (button == LEFT_BUTTON) {
ui->drag = LEFT_DRAG;
ui->release = LEFT_RELEASE;
#ifdef STYLUS_BASED
ui->state = (currstate + 2) % 3; /* FULL -> EMPTY -> UNKNOWN */
#else
ui->state = GRID_FULL;
#endif
} else if (button == RIGHT_BUTTON) {
ui->drag = RIGHT_DRAG;
ui->release = RIGHT_RELEASE;
#ifdef STYLUS_BASED
ui->state = (currstate + 1) % 3; /* EMPTY -> FULL -> UNKNOWN */
#else
ui->state = GRID_EMPTY;
#endif
} else /* if (button == MIDDLE_BUTTON) */ {
ui->drag = MIDDLE_DRAG;
ui->release = MIDDLE_RELEASE;
ui->state = GRID_UNKNOWN;
}
ui->drag_start_x = ui->drag_end_x = x;
ui->drag_start_y = ui->drag_end_y = y;
ui->cur_visible = 0;
return ""; /* UI activity occurred */
}
if (ui->dragging && button == ui->drag) {
/*
* There doesn't seem much point in allowing a rectangle
* drag; people will generally only want to drag a single
* horizontal or vertical line, so we make that easy by
* snapping to it.
*
* Exception: if we're _middle_-button dragging to tag
* things as UNKNOWN, we may well want to trash an entire
* area and start over!
*/
if (ui->state != GRID_UNKNOWN) {
if (abs(x - ui->drag_start_x) > abs(y - ui->drag_start_y))
y = ui->drag_start_y;
else
x = ui->drag_start_x;
}
if (x < 0) x = 0;
if (y < 0) y = 0;
if (x >= state->w) x = state->w - 1;
if (y >= state->h) y = state->h - 1;
ui->drag_end_x = x;
ui->drag_end_y = y;
return ""; /* UI activity occurred */
}
if (ui->dragging && button == ui->release) {
int x1, x2, y1, y2, xx, yy;
int move_needed = FALSE;
x1 = min(ui->drag_start_x, ui->drag_end_x);
x2 = max(ui->drag_start_x, ui->drag_end_x);
y1 = min(ui->drag_start_y, ui->drag_end_y);
y2 = max(ui->drag_start_y, ui->drag_end_y);
for (yy = y1; yy <= y2; yy++)
for (xx = x1; xx <= x2; xx++)
if (state->grid[yy * state->w + xx] != ui->state)
move_needed = TRUE;
ui->dragging = FALSE;
if (move_needed) {
char buf[80];
sprintf(buf, "%c%d,%d,%d,%d",
(char)(ui->state == GRID_FULL ? 'F' :
ui->state == GRID_EMPTY ? 'E' : 'U'),
x1, y1, x2-x1+1, y2-y1+1);
return dupstr(buf);
} else
return ""; /* UI activity occurred */
}
if (IS_CURSOR_MOVE(button)) {
move_cursor(button, &ui->cur_x, &ui->cur_y, state->w, state->h, 0);
ui->cur_visible = 1;
return "";
}
if (IS_CURSOR_SELECT(button)) {
int currstate = state->grid[ui->cur_y * state->w + ui->cur_x];
int newstate;
char buf[80];
if (!ui->cur_visible) {
ui->cur_visible = 1;
return "";
}
if (button == CURSOR_SELECT2)
newstate = currstate == GRID_UNKNOWN ? GRID_EMPTY :
currstate == GRID_EMPTY ? GRID_FULL : GRID_UNKNOWN;
else
newstate = currstate == GRID_UNKNOWN ? GRID_FULL :
currstate == GRID_FULL ? GRID_EMPTY : GRID_UNKNOWN;
sprintf(buf, "%c%d,%d,%d,%d",
(char)(newstate == GRID_FULL ? 'F' :
newstate == GRID_EMPTY ? 'E' : 'U'),
ui->cur_x, ui->cur_y, 1, 1);
return dupstr(buf);
}
return NULL;
}
static game_state *execute_move(game_state *from, char *move)
{
game_state *ret;
int x1, x2, y1, y2, xx, yy;
int val;
if (move[0] == 'S' && strlen(move) == from->w * from->h + 1) {
int i;
ret = dup_game(from);
for (i = 0; i < ret->w * ret->h; i++)
ret->grid[i] = (move[i+1] == '1' ? GRID_FULL : GRID_EMPTY);
ret->completed = ret->cheated = TRUE;
return ret;
} else if ((move[0] == 'F' || move[0] == 'E' || move[0] == 'U') &&
sscanf(move+1, "%d,%d,%d,%d", &x1, &y1, &x2, &y2) == 4 &&
x1 >= 0 && x2 >= 0 && x1+x2 <= from->w &&
y1 >= 0 && y2 >= 0 && y1+y2 <= from->h) {
x2 += x1;
y2 += y1;
val = (move[0] == 'F' ? GRID_FULL :
move[0] == 'E' ? GRID_EMPTY : GRID_UNKNOWN);
ret = dup_game(from);
for (yy = y1; yy < y2; yy++)
for (xx = x1; xx < x2; xx++)
ret->grid[yy * ret->w + xx] = val;
/*
* An actual change, so check to see if we've completed the
* game.
*/
if (!ret->completed) {
int *rowdata = snewn(ret->rowsize, int);
int i, len;
ret->completed = TRUE;
for (i=0; i<ret->w; i++) {
len = compute_rowdata(rowdata,
ret->grid+i, ret->h, ret->w);
if (len != ret->rowlen[i] ||
memcmp(ret->rowdata+i*ret->rowsize, rowdata,
len * sizeof(int))) {
ret->completed = FALSE;
break;
}
}
for (i=0; i<ret->h; i++) {
len = compute_rowdata(rowdata,
ret->grid+i*ret->w, ret->w, 1);
if (len != ret->rowlen[i+ret->w] ||
memcmp(ret->rowdata+(i+ret->w)*ret->rowsize, rowdata,
len * sizeof(int))) {
ret->completed = FALSE;
break;
}
}
sfree(rowdata);
}
return ret;
} else
return NULL;
}
/* ----------------------------------------------------------------------
* Error-checking during gameplay.
*/
/*
* The difficulty in error-checking Pattern is to make the error check
* _weak_ enough. The most obvious way would be to check each row and
* column by calling (a modified form of) do_row() to recursively
* analyse the row contents against the clue set and see if the
* GRID_UNKNOWNs could be filled in in any way that would end up
* correct. However, this turns out to be such a strong error check as
* to constitute a spoiler in many situations: you make a typo while
* trying to fill in one row, and not only does the row light up to
* indicate an error, but several columns crossed by the move also
* light up and draw your attention to deductions you hadn't even
* noticed you could make.
*
* So instead I restrict error-checking to 'complete runs' within a
* row, by which I mean contiguous sequences of GRID_FULL bounded at
* both ends by either GRID_EMPTY or the ends of the row. We identify
* all the complete runs in a row, and verify that _those_ are
* consistent with the row's clue list. Sequences of complete runs
* separated by solid GRID_EMPTY are required to match contiguous
* sequences in the clue list, whereas if there's at least one
* GRID_UNKNOWN between any two complete runs then those two need not
* be contiguous in the clue list.
*
* To simplify the edge cases, I pretend that the clue list for the
* row is extended with a 0 at each end, and I also pretend that the
* grid data for the row is extended with a GRID_EMPTY and a
* zero-length run at each end. This permits the contiguity checker to
* handle the fiddly end effects (e.g. if the first contiguous
* sequence of complete runs in the grid matches _something_ in the
* clue list but not at the beginning, this is allowable iff there's a
* GRID_UNKNOWN before the first one) with minimal faff, since the end
* effects just drop out as special cases of the normal inter-run
* handling (in this code the above case is not 'at the end of the
* clue list' at all, but between the implicit initial zero run and
* the first nonzero one).
*
* We must also be a little careful about how we search for a
* contiguous sequence of runs. In the clue list (1 1 2 1 2 3),
* suppose we see a GRID_UNKNOWN and then a length-1 run. We search
* for 1 in the clue list and find it at the very beginning. But now
* suppose we find a length-2 run with no GRID_UNKNOWN before it. We
* can't naively look at the next clue from the 1 we found, because
* that'll be the second 1 and won't match. Instead, we must backtrack
* by observing that the 2 we've just found must be contiguous with
* the 1 we've already seen, so we search for the sequence (1 2) and
* find it starting at the second 1. Now if we see a 3, we must
* rethink again and search for (1 2 3).
*/
struct errcheck_state {
/*
* rowdata and rowlen point at the clue data for this row in the
* game state.
*/
int *rowdata;
int rowlen;
/*
* rowpos indicates the lowest position where it would be valid to
* see our next run length. It might be equal to rowlen,
* indicating that the next run would have to be the terminating 0.
*/
int rowpos;
/*
* ncontig indicates how many runs we've seen in a contiguous
* block. This is taken into account when searching for the next
* run we find, unless ncontig is zeroed out first by encountering
* a GRID_UNKNOWN.
*/
int ncontig;
};
static int errcheck_found_run(struct errcheck_state *es, int r)
{
/* Macro to handle the pretence that rowdata has a 0 at each end */
#define ROWDATA(k) ((k)<0 || (k)>=es->rowlen ? 0 : es->rowdata[(k)])
/*
* See if we can find this new run length at a position where it
* also matches the last 'ncontig' runs we've seen.
*/
int i, newpos;
for (newpos = es->rowpos; newpos <= es->rowlen; newpos++) {
if (ROWDATA(newpos) != r)
goto notfound;
for (i = 1; i <= es->ncontig; i++)
if (ROWDATA(newpos - i) != ROWDATA(es->rowpos - i))
goto notfound;
es->rowpos = newpos+1;
es->ncontig++;
return TRUE;
notfound:;
}
return FALSE;
#undef ROWDATA
}
static int check_errors(game_state *state, int i)
{
int start, step, end, j;
int val, runlen;
struct errcheck_state aes, *es = &aes;
es->rowlen = state->rowlen[i];
es->rowdata = state->rowdata + state->rowsize * i;
/* Pretend that we've already encountered the initial zero run */
es->ncontig = 1;
es->rowpos = 0;
if (i < state->w) {
start = i;
step = state->w;
end = start + step * state->h;
} else {
start = (i - state->w) * state->w;
step = 1;
end = start + step * state->w;
}
runlen = -1;
for (j = start - step; j <= end; j += step) {
if (j < start || j == end)
val = GRID_EMPTY;
else
val = state->grid[j];
if (val == GRID_UNKNOWN) {
runlen = -1;
es->ncontig = 0;
} else if (val == GRID_FULL) {
if (runlen >= 0)
runlen++;
} else if (val == GRID_EMPTY) {
if (runlen > 0) {
if (!errcheck_found_run(es, runlen))
return TRUE; /* error! */
}
runlen = 0;
}
}
/* Signal end-of-row by sending errcheck_found_run the terminating
* zero run, which will be marked as contiguous with the previous
* run if and only if there hasn't been a GRID_UNKNOWN before. */
if (!errcheck_found_run(es, 0))
return TRUE; /* error at the last minute! */
return FALSE; /* no error */
}
/* ----------------------------------------------------------------------
* 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; } ads, *ds = &ads;
ads.tilesize = tilesize;
*x = SIZE(params->w);
*y = SIZE(params->h);
}
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);
int i;
frontend_default_colour(fe, &ret[COL_BACKGROUND * 3]);
for (i = 0; i < 3; i++) {
ret[COL_GRID * 3 + i] = 0.3F;
ret[COL_UNKNOWN * 3 + i] = 0.5F;
ret[COL_TEXT * 3 + i] = 0.0F;
ret[COL_FULL * 3 + i] = 0.0F;
ret[COL_EMPTY * 3 + i] = 1.0F;
}
ret[COL_CURSOR * 3 + 0] = 1.0F;
ret[COL_CURSOR * 3 + 1] = 0.25F;
ret[COL_CURSOR * 3 + 2] = 0.25F;
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, game_state *state)
{
struct game_drawstate *ds = snew(struct game_drawstate);
ds->started = FALSE;
ds->w = state->w;
ds->h = state->h;
ds->visible = snewn(ds->w * ds->h, unsigned char);
ds->tilesize = 0; /* not decided yet */
memset(ds->visible, 255, ds->w * ds->h);
ds->numcolours = snewn(ds->w + ds->h, unsigned char);
memset(ds->numcolours, 255, ds->w + ds->h);
ds->cur_x = ds->cur_y = 0;
return ds;
}
static void game_free_drawstate(drawing *dr, game_drawstate *ds)
{
sfree(ds->visible);
sfree(ds);
}
static void grid_square(drawing *dr, game_drawstate *ds,
int y, int x, int state, int cur)
{
int xl, xr, yt, yb, dx, dy, dw, dh;
draw_rect(dr, TOCOORD(ds->w, x), TOCOORD(ds->h, y),
TILE_SIZE, TILE_SIZE, COL_GRID);
xl = (x % 5 == 0 ? 1 : 0);
yt = (y % 5 == 0 ? 1 : 0);
xr = (x % 5 == 4 || x == ds->w-1 ? 1 : 0);
yb = (y % 5 == 4 || y == ds->h-1 ? 1 : 0);
dx = TOCOORD(ds->w, x) + 1 + xl;
dy = TOCOORD(ds->h, y) + 1 + yt;
dw = TILE_SIZE - xl - xr - 1;
dh = TILE_SIZE - yt - yb - 1;
draw_rect(dr, dx, dy, dw, dh,
(state == GRID_FULL ? COL_FULL :
state == GRID_EMPTY ? COL_EMPTY : COL_UNKNOWN));
if (cur) {
draw_rect_outline(dr, dx, dy, dw, dh, COL_CURSOR);
draw_rect_outline(dr, dx+1, dy+1, dw-2, dh-2, COL_CURSOR);
}
draw_update(dr, TOCOORD(ds->w, x), TOCOORD(ds->h, y),
TILE_SIZE, TILE_SIZE);
}
/*
* Draw the numbers for a single row or column.
*/
static void draw_numbers(drawing *dr, game_drawstate *ds, game_state *state,
int i, int erase, int colour)
{
int rowlen = state->rowlen[i];
int *rowdata = state->rowdata + state->rowsize * i;
int nfit;
int j;
if (erase) {
if (i < state->w) {
draw_rect(dr, TOCOORD(state->w, i), 0,
TILE_SIZE, BORDER + TLBORDER(state->w) * TILE_SIZE,
COL_BACKGROUND);
} else {
draw_rect(dr, 0, TOCOORD(state->h, i - state->w),
BORDER + TLBORDER(state->h) * TILE_SIZE, TILE_SIZE,
COL_BACKGROUND);
}
}
/*
* Normally I space the numbers out by the same distance as the
* tile size. However, if there are more numbers than available
* spaces, I have to squash them up a bit.
*/
nfit = max(rowlen, TLBORDER(state->h))-1;
assert(nfit > 0);
for (j = 0; j < rowlen; j++) {
int x, y;
char str[80];
if (i < state->w) {
x = TOCOORD(state->w, i);
y = BORDER + TILE_SIZE * (TLBORDER(state->h)-1);
y -= ((rowlen-j-1)*TILE_SIZE) * (TLBORDER(state->h)-1) / nfit;
} else {
y = TOCOORD(state->h, i - state->w);
x = BORDER + TILE_SIZE * (TLBORDER(state->w)-1);
x -= ((rowlen-j-1)*TILE_SIZE) * (TLBORDER(state->h)-1) / nfit;
}
sprintf(str, "%d", rowdata[j]);
draw_text(dr, x+TILE_SIZE/2, y+TILE_SIZE/2, FONT_VARIABLE,
TILE_SIZE/2, ALIGN_HCENTRE | ALIGN_VCENTRE, colour, str);
}
if (i < state->w) {
draw_update(dr, TOCOORD(state->w, i), 0,
TILE_SIZE, BORDER + TLBORDER(state->w) * TILE_SIZE);
} else {
draw_update(dr, 0, TOCOORD(state->h, i - state->w),
BORDER + TLBORDER(state->h) * TILE_SIZE, TILE_SIZE);
}
}
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 i, j;
int x1, x2, y1, y2;
int cx, cy, cmoved;
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, SIZE(ds->w), SIZE(ds->h), COL_BACKGROUND);
/*
* Draw the grid outline.
*/
draw_rect(dr, TOCOORD(ds->w, 0) - 1, TOCOORD(ds->h, 0) - 1,
ds->w * TILE_SIZE + 3, ds->h * TILE_SIZE + 3,
COL_GRID);
ds->started = TRUE;
draw_update(dr, 0, 0, SIZE(ds->w), SIZE(ds->h));
}
if (ui->dragging) {
x1 = min(ui->drag_start_x, ui->drag_end_x);
x2 = max(ui->drag_start_x, ui->drag_end_x);
y1 = min(ui->drag_start_y, ui->drag_end_y);
y2 = max(ui->drag_start_y, ui->drag_end_y);
} else {
x1 = x2 = y1 = y2 = -1; /* placate gcc warnings */
}
if (ui->cur_visible) {
cx = ui->cur_x; cy = ui->cur_y;
} else {
cx = cy = -1;
}
cmoved = (cx != ds->cur_x || cy != ds->cur_y);
/*
* Now draw any grid squares which have changed since last
* redraw.
*/
for (i = 0; i < ds->h; i++) {
for (j = 0; j < ds->w; j++) {
int val, cc = 0;
/*
* Work out what state this square should be drawn in,
* taking any current drag operation into account.
*/
if (ui->dragging && x1 <= j && j <= x2 && y1 <= i && i <= y2)
val = ui->state;
else
val = state->grid[i * state->w + j];
if (cmoved) {
/* the cursor has moved; if we were the old or
* the new cursor position we need to redraw. */
if (j == cx && i == cy) cc = 1;
if (j == ds->cur_x && i == ds->cur_y) cc = 1;
}
/*
* Briefly invert everything twice during a completion
* flash.
*/
if (flashtime > 0 &&
(flashtime <= FLASH_TIME/3 || flashtime >= FLASH_TIME*2/3) &&
val != GRID_UNKNOWN)
val = (GRID_FULL ^ GRID_EMPTY) ^ val;
if (ds->visible[i * ds->w + j] != val || cc) {
grid_square(dr, ds, i, j, val,
(j == cx && i == cy));
ds->visible[i * ds->w + j] = val;
}
}
}
ds->cur_x = cx; ds->cur_y = cy;
/*
* Redraw any numbers which have changed their colour due to error
* indication.
*/
for (i = 0; i < state->w + state->h; i++) {
int colour = check_errors(state, i) ? COL_ERROR : COL_TEXT;
if (ds->numcolours[i] != colour) {
draw_numbers(dr, ds, state, i, TRUE, colour);
ds->numcolours[i] = colour;
}
}
}
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 &&
!oldstate->cheated && !newstate->cheated)
return FLASH_TIME;
return 0.0F;
}
static int game_status(game_state *state)
{
return state->completed ? +1 : 0;
}
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 5mm squares by default.
*/
game_compute_size(params, 500, &pw, &ph);
*x = pw / 100.0F;
*y = ph / 100.0F;
}
static void game_print(drawing *dr, game_state *state, int tilesize)
{
int w = state->w, h = state->h;
int ink = print_mono_colour(dr, 0);
int x, y, i;
/* Ick: fake up `ds->tilesize' for macro expansion purposes */
game_drawstate ads, *ds = &ads;
game_set_size(dr, ds, NULL, tilesize);
/*
* Border.
*/
print_line_width(dr, TILE_SIZE / 16);
draw_rect_outline(dr, TOCOORD(w, 0), TOCOORD(h, 0),
w*TILE_SIZE, h*TILE_SIZE, ink);
/*
* Grid.
*/
for (x = 1; x < w; x++) {
print_line_width(dr, TILE_SIZE / (x % 5 ? 128 : 24));
draw_line(dr, TOCOORD(w, x), TOCOORD(h, 0),
TOCOORD(w, x), TOCOORD(h, h), ink);
}
for (y = 1; y < h; y++) {
print_line_width(dr, TILE_SIZE / (y % 5 ? 128 : 24));
draw_line(dr, TOCOORD(w, 0), TOCOORD(h, y),
TOCOORD(w, w), TOCOORD(h, y), ink);
}
/*
* Clues.
*/
for (i = 0; i < state->w + state->h; i++)
draw_numbers(dr, ds, state, i, FALSE, ink);
/*
* Solution.
*/
print_line_width(dr, TILE_SIZE / 128);
for (y = 0; y < h; y++)
for (x = 0; x < w; x++) {
if (state->grid[y*w+x] == GRID_FULL)
draw_rect(dr, TOCOORD(w, x), TOCOORD(h, y),
TILE_SIZE, TILE_SIZE, ink);
else if (state->grid[y*w+x] == GRID_EMPTY)
draw_circle(dr, TOCOORD(w, x) + TILE_SIZE/2,
TOCOORD(h, y) + TILE_SIZE/2,
TILE_SIZE/12, ink, ink);
}
}
#ifdef COMBINED
#define thegame pattern
#endif
const struct game thegame = {
"Pattern", "games.pattern", "pattern",
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,
FALSE, 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,
game_status,
TRUE, FALSE, game_print_size, game_print,
FALSE, /* wants_statusbar */
FALSE, game_timing_state,
REQUIRE_RBUTTON, /* flags */
};
#ifdef STANDALONE_SOLVER
int main(int argc, char **argv)
{
game_params *p;
game_state *s;
char *id = NULL, *desc, *err;
while (--argc > 0) {
char *p = *++argv;
if (*p == '-') {
if (!strcmp(p, "-v")) {
verbose = TRUE;
} else {
fprintf(stderr, "%s: unrecognised option `%s'\n", argv[0], p);
return 1;
}
} else {
id = p;
}
}
if (!id) {
fprintf(stderr, "usage: %s <game_id>\n", argv[0]);
return 1;
}
desc = strchr(id, ':');
if (!desc) {
fprintf(stderr, "%s: game id expects a colon in it\n", argv[0]);
return 1;
}
*desc++ = '\0';
p = default_params();
decode_params(p, id);
err = validate_desc(p, desc);
if (err) {
fprintf(stderr, "%s: %s\n", argv[0], err);
return 1;
}
s = new_game(NULL, p, desc);
{
int w = p->w, h = p->h, i, j, done_any, max, cluewid = 0;
unsigned char *matrix, *workspace;
int *rowdata;
matrix = snewn(w*h, unsigned char);
max = max(w, h);
workspace = snewn(max*3, unsigned char);
rowdata = snewn(max+1, int);
memset(matrix, 0, w*h);
if (verbose) {
int thiswid;
/*
* Work out the maximum text width of the clue numbers
* in a row or column, so we can print the solver's
* working in a nicely lined up way.
*/
for (i = 0; i < (w+h); i++) {
char buf[80];
for (thiswid = -1, j = 0; j < s->rowlen[i]; j++)
thiswid += sprintf(buf, " %d", s->rowdata[s->rowsize*i+j]);
if (cluewid < thiswid)
cluewid = thiswid;
}
}
do {
done_any = 0;
for (i=0; i<h; i++) {
memcpy(rowdata, s->rowdata + s->rowsize*(w+i),
max*sizeof(int));
rowdata[s->rowlen[w+i]] = 0;
done_any |= do_row(workspace, workspace+max, workspace+2*max,
matrix+i*w, w, 1, rowdata
#ifdef STANDALONE_SOLVER
, "row", i+1, cluewid
#endif
);
}
for (i=0; i<w; i++) {
memcpy(rowdata, s->rowdata + s->rowsize*i, max*sizeof(int));
rowdata[s->rowlen[i]] = 0;
done_any |= do_row(workspace, workspace+max, workspace+2*max,
matrix+i, h, w, rowdata
#ifdef STANDALONE_SOLVER
, "col", i+1, cluewid
#endif
);
}
} while (done_any);
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++) {
int c = (matrix[i*w+j] == UNKNOWN ? '?' :
matrix[i*w+j] == BLOCK ? '#' :
matrix[i*w+j] == DOT ? '.' :
'!');
putchar(c);
}
printf("\n");
}
}
return 0;
}
#endif
/* vim: set shiftwidth=4 tabstop=8: */