ref: 3fbb23e3546c2ac68933c73f3a38388ffc34e33e
dir: /dominosa.c/
/*
* dominosa.c: Domino jigsaw puzzle. Aim to place one of every
* possible domino within a rectangle in such a way that the number
* on each square matches the provided clue.
*/
/*
* TODO:
*
* - improve solver so as to use more interesting forms of
* deduction
*
* * rule out a domino placement if it would divide an unfilled
* region such that at least one resulting region had an odd
* area
* + use b.f.s. to determine the area of an unfilled region
* + a square is unfilled iff it has at least two possible
* placements, and two adjacent unfilled squares are part
* of the same region iff the domino placement joining
* them is possible
*
* * perhaps set analysis
* + look at all unclaimed squares containing a given number
* + for each one, find the set of possible numbers that it
* can connect to (i.e. each neighbouring tile such that
* the placement between it and that neighbour has not yet
* been ruled out)
* + now proceed similarly to Solo set analysis: try to find
* a subset of the squares such that the union of their
* possible numbers is the same size as the subset. If so,
* rule out those possible numbers for all other squares.
* * important wrinkle: the double dominoes complicate
* matters. Connecting a number to itself uses up _two_
* of the unclaimed squares containing a number. Thus,
* when finding the initial subset we must never
* include two adjacent squares; and also, when ruling
* things out after finding the subset, we must be
* careful that we don't rule out precisely the domino
* placement that was _included_ in our set!
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>
#include <math.h>
#include "puzzles.h"
/* nth triangular number */
#define TRI(n) ( (n) * ((n) + 1) / 2 )
/* number of dominoes for value n */
#define DCOUNT(n) TRI((n)+1)
/* map a pair of numbers to a unique domino index from 0 upwards. */
#define DINDEX(n1,n2) ( TRI(max(n1,n2)) + min(n1,n2) )
#define FLASH_TIME 0.13F
enum {
COL_BACKGROUND,
COL_TEXT,
COL_DOMINO,
COL_DOMINOCLASH,
COL_DOMINOTEXT,
COL_EDGE,
NCOLOURS
};
struct game_params {
int n;
int unique;
};
struct game_numbers {
int refcount;
int *numbers; /* h x w */
};
#define EDGE_L 0x100
#define EDGE_R 0x200
#define EDGE_T 0x400
#define EDGE_B 0x800
struct game_state {
game_params params;
int w, h;
struct game_numbers *numbers;
int *grid;
unsigned short *edges; /* h x w */
int completed, cheated;
};
static game_params *default_params(void)
{
game_params *ret = snew(game_params);
ret->n = 6;
ret->unique = TRUE;
return ret;
}
static int game_fetch_preset(int i, char **name, game_params **params)
{
game_params *ret;
int n;
char buf[80];
switch (i) {
case 0: n = 3; break;
case 1: n = 4; break;
case 2: n = 5; break;
case 3: n = 6; break;
case 4: n = 7; break;
case 5: n = 8; break;
case 6: n = 9; break;
default: return FALSE;
}
sprintf(buf, "Up to double-%d", n);
*name = dupstr(buf);
*params = ret = snew(game_params);
ret->n = n;
ret->unique = TRUE;
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 *params, char const *string)
{
params->n = atoi(string);
while (*string && isdigit((unsigned char)*string)) string++;
if (*string == 'a')
params->unique = FALSE;
}
static char *encode_params(game_params *params, int full)
{
char buf[80];
sprintf(buf, "%d", params->n);
if (full && !params->unique)
strcat(buf, "a");
return dupstr(buf);
}
static config_item *game_configure(game_params *params)
{
config_item *ret;
char buf[80];
ret = snewn(3, config_item);
ret[0].name = "Maximum number on dominoes";
ret[0].type = C_STRING;
sprintf(buf, "%d", params->n);
ret[0].sval = dupstr(buf);
ret[0].ival = 0;
ret[1].name = "Ensure unique solution";
ret[1].type = C_BOOLEAN;
ret[1].sval = NULL;
ret[1].ival = params->unique;
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->n = atoi(cfg[0].sval);
ret->unique = cfg[1].ival;
return ret;
}
static char *validate_params(game_params *params, int full)
{
if (params->n < 1)
return "Maximum face number must be at least one";
return NULL;
}
/* ----------------------------------------------------------------------
* Solver.
*/
static int find_overlaps(int w, int h, int placement, int *set)
{
int x, y, n;
n = 0; /* number of returned placements */
x = placement / 2;
y = x / w;
x %= w;
if (placement & 1) {
/*
* Horizontal domino, indexed by its left end.
*/
if (x > 0)
set[n++] = placement-2; /* horizontal domino to the left */
if (y > 0)
set[n++] = placement-2*w-1;/* vertical domino above left side */
if (y+1 < h)
set[n++] = placement-1; /* vertical domino below left side */
if (x+2 < w)
set[n++] = placement+2; /* horizontal domino to the right */
if (y > 0)
set[n++] = placement-2*w+2-1;/* vertical domino above right side */
if (y+1 < h)
set[n++] = placement+2-1; /* vertical domino below right side */
} else {
/*
* Vertical domino, indexed by its top end.
*/
if (y > 0)
set[n++] = placement-2*w; /* vertical domino above */
if (x > 0)
set[n++] = placement-2+1; /* horizontal domino left of top */
if (x+1 < w)
set[n++] = placement+1; /* horizontal domino right of top */
if (y+2 < h)
set[n++] = placement+2*w; /* vertical domino below */
if (x > 0)
set[n++] = placement-2+2*w+1;/* horizontal domino left of bottom */
if (x+1 < w)
set[n++] = placement+2*w+1;/* horizontal domino right of bottom */
}
return n;
}
/*
* Returns 0, 1 or 2 for number of solutions. 2 means `any number
* more than one', or more accurately `we were unable to prove
* there was only one'.
*
* Outputs in a `placements' array, indexed the same way as the one
* within this function (see below); entries in there are <0 for a
* placement ruled out, 0 for an uncertain placement, and 1 for a
* definite one.
*/
static int solver(int w, int h, int n, int *grid, int *output)
{
int wh = w*h, dc = DCOUNT(n);
int *placements, *heads;
int i, j, x, y, ret;
/*
* This array has one entry for every possible domino
* placement. Vertical placements are indexed by their top
* half, at (y*w+x)*2; horizontal placements are indexed by
* their left half at (y*w+x)*2+1.
*
* This array is used to link domino placements together into
* linked lists, so that we can track all the possible
* placements of each different domino. It's also used as a
* quick means of looking up an individual placement to see
* whether we still think it's possible. Actual values stored
* in this array are -2 (placement not possible at all), -1
* (end of list), or the array index of the next item.
*
* Oh, and -3 for `not even valid', used for array indices
* which don't even represent a plausible placement.
*/
placements = snewn(2*wh, int);
for (i = 0; i < 2*wh; i++)
placements[i] = -3; /* not even valid */
/*
* This array has one entry for every domino, and it is an
* index into `placements' denoting the head of the placement
* list for that domino.
*/
heads = snewn(dc, int);
for (i = 0; i < dc; i++)
heads[i] = -1;
/*
* Set up the initial possibility lists by scanning the grid.
*/
for (y = 0; y < h-1; y++)
for (x = 0; x < w; x++) {
int di = DINDEX(grid[y*w+x], grid[(y+1)*w+x]);
placements[(y*w+x)*2] = heads[di];
heads[di] = (y*w+x)*2;
}
for (y = 0; y < h; y++)
for (x = 0; x < w-1; x++) {
int di = DINDEX(grid[y*w+x], grid[y*w+(x+1)]);
placements[(y*w+x)*2+1] = heads[di];
heads[di] = (y*w+x)*2+1;
}
#ifdef SOLVER_DIAGNOSTICS
printf("before solver:\n");
for (i = 0; i <= n; i++)
for (j = 0; j <= i; j++) {
int k, m;
m = 0;
printf("%2d [%d %d]:", DINDEX(i, j), i, j);
for (k = heads[DINDEX(i,j)]; k >= 0; k = placements[k])
printf(" %3d [%d,%d,%c]", k, k/2%w, k/2/w, k%2?'h':'v');
printf("\n");
}
#endif
while (1) {
int done_something = FALSE;
/*
* For each domino, look at its possible placements, and
* for each placement consider the placements (of any
* domino) it overlaps. Any placement overlapped by all
* placements of this domino can be ruled out.
*
* Each domino placement overlaps only six others, so we
* need not do serious set theory to work this out.
*/
for (i = 0; i < dc; i++) {
int permset[6], permlen = 0, p;
if (heads[i] == -1) { /* no placement for this domino */
ret = 0; /* therefore puzzle is impossible */
goto done;
}
for (j = heads[i]; j >= 0; j = placements[j]) {
assert(placements[j] != -2);
if (j == heads[i]) {
permlen = find_overlaps(w, h, j, permset);
} else {
int tempset[6], templen, m, n, k;
templen = find_overlaps(w, h, j, tempset);
/*
* Pathetically primitive set intersection
* algorithm, which I'm only getting away with
* because I know my sets are bounded by a very
* small size.
*/
for (m = n = 0; m < permlen; m++) {
for (k = 0; k < templen; k++)
if (tempset[k] == permset[m])
break;
if (k < templen)
permset[n++] = permset[m];
}
permlen = n;
}
}
for (p = 0; p < permlen; p++) {
j = permset[p];
if (placements[j] != -2) {
int p1, p2, di;
done_something = TRUE;
/*
* Rule out this placement. First find what
* domino it is...
*/
p1 = j / 2;
p2 = (j & 1) ? p1 + 1 : p1 + w;
di = DINDEX(grid[p1], grid[p2]);
#ifdef SOLVER_DIAGNOSTICS
printf("considering domino %d: ruling out placement %d"
" for %d\n", i, j, di);
#endif
/*
* ... then walk that domino's placement list,
* removing this placement when we find it.
*/
if (heads[di] == j)
heads[di] = placements[j];
else {
int k = heads[di];
while (placements[k] != -1 && placements[k] != j)
k = placements[k];
assert(placements[k] == j);
placements[k] = placements[j];
}
placements[j] = -2;
}
}
}
/*
* For each square, look at the available placements
* involving that square. If all of them are for the same
* domino, then rule out any placements for that domino
* _not_ involving this square.
*/
for (i = 0; i < wh; i++) {
int list[4], k, n, adi;
x = i % w;
y = i / w;
j = 0;
if (x > 0)
list[j++] = 2*(i-1)+1;
if (x+1 < w)
list[j++] = 2*i+1;
if (y > 0)
list[j++] = 2*(i-w);
if (y+1 < h)
list[j++] = 2*i;
for (n = k = 0; k < j; k++)
if (placements[list[k]] >= -1)
list[n++] = list[k];
adi = -1;
for (j = 0; j < n; j++) {
int p1, p2, di;
k = list[j];
p1 = k / 2;
p2 = (k & 1) ? p1 + 1 : p1 + w;
di = DINDEX(grid[p1], grid[p2]);
if (adi == -1)
adi = di;
if (adi != di)
break;
}
if (j == n) {
int nn;
assert(adi >= 0);
/*
* We've found something. All viable placements
* involving this square are for domino `adi'. If
* the current placement list for that domino is
* longer than n, reduce it to precisely this
* placement list and we've done something.
*/
nn = 0;
for (k = heads[adi]; k >= 0; k = placements[k])
nn++;
if (nn > n) {
done_something = TRUE;
#ifdef SOLVER_DIAGNOSTICS
printf("considering square %d,%d: reducing placements "
"of domino %d\n", x, y, adi);
#endif
/*
* Set all other placements on the list to
* impossible.
*/
k = heads[adi];
while (k >= 0) {
int tmp = placements[k];
placements[k] = -2;
k = tmp;
}
/*
* Set up the new list.
*/
heads[adi] = list[0];
for (k = 0; k < n; k++)
placements[list[k]] = (k+1 == n ? -1 : list[k+1]);
}
}
}
if (!done_something)
break;
}
#ifdef SOLVER_DIAGNOSTICS
printf("after solver:\n");
for (i = 0; i <= n; i++)
for (j = 0; j <= i; j++) {
int k, m;
m = 0;
printf("%2d [%d %d]:", DINDEX(i, j), i, j);
for (k = heads[DINDEX(i,j)]; k >= 0; k = placements[k])
printf(" %3d [%d,%d,%c]", k, k/2%w, k/2/w, k%2?'h':'v');
printf("\n");
}
#endif
ret = 1;
for (i = 0; i < wh*2; i++) {
if (placements[i] == -2) {
if (output)
output[i] = -1; /* ruled out */
} else if (placements[i] != -3) {
int p1, p2, di;
p1 = i / 2;
p2 = (i & 1) ? p1 + 1 : p1 + w;
di = DINDEX(grid[p1], grid[p2]);
if (i == heads[di] && placements[i] == -1) {
if (output)
output[i] = 1; /* certain */
} else {
if (output)
output[i] = 0; /* uncertain */
ret = 2;
}
}
}
done:
/*
* Free working data.
*/
sfree(placements);
sfree(heads);
return ret;
}
/* ----------------------------------------------------------------------
* End of solver code.
*/
static char *new_game_desc(game_params *params, random_state *rs,
char **aux, int interactive)
{
int n = params->n, w = n+2, h = n+1, wh = w*h;
int *grid, *grid2, *list;
int i, j, k, len;
char *ret;
/*
* Allocate space in which to lay the grid out.
*/
grid = snewn(wh, int);
grid2 = snewn(wh, int);
list = snewn(2*wh, int);
/*
* I haven't been able to think of any particularly clever
* techniques for generating instances of Dominosa with a
* unique solution. Many of the deductions used in this puzzle
* are based on information involving half the grid at a time
* (`of all the 6s, exactly one is next to a 3'), so a strategy
* of partially solving the grid and then perturbing the place
* where the solver got stuck seems particularly likely to
* accidentally destroy the information which the solver had
* used in getting that far. (Contrast with, say, Mines, in
* which most deductions are local so this is an excellent
* strategy.)
*
* Therefore I resort to the basest of brute force methods:
* generate a random grid, see if it's solvable, throw it away
* and try again if not. My only concession to sophistication
* and cleverness is to at least _try_ not to generate obvious
* 2x2 ambiguous sections (see comment below in the domino-
* flipping section).
*
* During tests performed on 2005-07-15, I found that the brute
* force approach without that tweak had to throw away about 87
* grids on average (at the default n=6) before finding a
* unique one, or a staggering 379 at n=9; good job the
* generator and solver are fast! When I added the
* ambiguous-section avoidance, those numbers came down to 19
* and 26 respectively, which is a lot more sensible.
*/
do {
domino_layout_prealloc(w, h, rs, grid, grid2, list);
/*
* Now we have a complete layout covering the whole
* rectangle with dominoes. So shuffle the actual domino
* values and fill the rectangle with numbers.
*/
k = 0;
for (i = 0; i <= params->n; i++)
for (j = 0; j <= i; j++) {
list[k++] = i;
list[k++] = j;
}
shuffle(list, k/2, 2*sizeof(*list), rs);
j = 0;
for (i = 0; i < wh; i++)
if (grid[i] > i) {
/* Optionally flip the domino round. */
int flip = -1;
if (params->unique) {
int t1, t2;
/*
* If we're after a unique solution, we can do
* something here to improve the chances. If
* we're placing a domino so that it forms a
* 2x2 rectangle with one we've already placed,
* and if that domino and this one share a
* number, we can try not to put them so that
* the identical numbers are diagonally
* separated, because that automatically causes
* non-uniqueness:
*
* +---+ +-+-+
* |2 3| |2|3|
* +---+ -> | | |
* |4 2| |4|2|
* +---+ +-+-+
*/
t1 = i;
t2 = grid[i];
if (t2 == t1 + w) { /* this domino is vertical */
if (t1 % w > 0 &&/* and not on the left hand edge */
grid[t1-1] == t2-1 &&/* alongside one to left */
(grid2[t1-1] == list[j] || /* and has a number */
grid2[t1-1] == list[j+1] || /* in common */
grid2[t2-1] == list[j] ||
grid2[t2-1] == list[j+1])) {
if (grid2[t1-1] == list[j] ||
grid2[t2-1] == list[j+1])
flip = 0;
else
flip = 1;
}
} else { /* this domino is horizontal */
if (t1 / w > 0 &&/* and not on the top edge */
grid[t1-w] == t2-w &&/* alongside one above */
(grid2[t1-w] == list[j] || /* and has a number */
grid2[t1-w] == list[j+1] || /* in common */
grid2[t2-w] == list[j] ||
grid2[t2-w] == list[j+1])) {
if (grid2[t1-w] == list[j] ||
grid2[t2-w] == list[j+1])
flip = 0;
else
flip = 1;
}
}
}
if (flip < 0)
flip = random_upto(rs, 2);
grid2[i] = list[j + flip];
grid2[grid[i]] = list[j + 1 - flip];
j += 2;
}
assert(j == k);
} while (params->unique && solver(w, h, n, grid2, NULL) > 1);
#ifdef GENERATION_DIAGNOSTICS
for (j = 0; j < h; j++) {
for (i = 0; i < w; i++) {
putchar('0' + grid2[j*w+i]);
}
putchar('\n');
}
putchar('\n');
#endif
/*
* Encode the resulting game state.
*
* Our encoding is a string of digits. Any number greater than
* 9 is represented by a decimal integer within square
* brackets. We know there are n+2 of every number (it's paired
* with each number from 0 to n inclusive, and one of those is
* itself so that adds another occurrence), so we can work out
* the string length in advance.
*/
/*
* To work out the total length of the decimal encodings of all
* the numbers from 0 to n inclusive:
* - every number has a units digit; total is n+1.
* - all numbers above 9 have a tens digit; total is max(n+1-10,0).
* - all numbers above 99 have a hundreds digit; total is max(n+1-100,0).
* - and so on.
*/
len = n+1;
for (i = 10; i <= n; i *= 10)
len += max(n + 1 - i, 0);
/* Now add two square brackets for each number above 9. */
len += 2 * max(n + 1 - 10, 0);
/* And multiply by n+2 for the repeated occurrences of each number. */
len *= n+2;
/*
* Now actually encode the string.
*/
ret = snewn(len+1, char);
j = 0;
for (i = 0; i < wh; i++) {
k = grid2[i];
if (k < 10)
ret[j++] = '0' + k;
else
j += sprintf(ret+j, "[%d]", k);
assert(j <= len);
}
assert(j == len);
ret[j] = '\0';
/*
* Encode the solved state as an aux_info.
*/
{
char *auxinfo = snewn(wh+1, char);
for (i = 0; i < wh; i++) {
int v = grid[i];
auxinfo[i] = (v == i+1 ? 'L' : v == i-1 ? 'R' :
v == i+w ? 'T' : v == i-w ? 'B' : '.');
}
auxinfo[wh] = '\0';
*aux = auxinfo;
}
sfree(list);
sfree(grid2);
sfree(grid);
return ret;
}
static char *validate_desc(game_params *params, char *desc)
{
int n = params->n, w = n+2, h = n+1, wh = w*h;
int *occurrences;
int i, j;
char *ret;
ret = NULL;
occurrences = snewn(n+1, int);
for (i = 0; i <= n; i++)
occurrences[i] = 0;
for (i = 0; i < wh; i++) {
if (!*desc) {
ret = ret ? ret : "Game description is too short";
} else {
if (*desc >= '0' && *desc <= '9')
j = *desc++ - '0';
else if (*desc == '[') {
desc++;
j = atoi(desc);
while (*desc && isdigit((unsigned char)*desc)) desc++;
if (*desc != ']')
ret = ret ? ret : "Missing ']' in game description";
else
desc++;
} else {
j = -1;
ret = ret ? ret : "Invalid syntax in game description";
}
if (j < 0 || j > n)
ret = ret ? ret : "Number out of range in game description";
else
occurrences[j]++;
}
}
if (*desc)
ret = ret ? ret : "Game description is too long";
if (!ret) {
for (i = 0; i <= n; i++)
if (occurrences[i] != n+2)
ret = "Incorrect number balance in game description";
}
sfree(occurrences);
return ret;
}
static game_state *new_game(midend *me, game_params *params, char *desc)
{
int n = params->n, w = n+2, h = n+1, wh = w*h;
game_state *state = snew(game_state);
int i, j;
state->params = *params;
state->w = w;
state->h = h;
state->grid = snewn(wh, int);
for (i = 0; i < wh; i++)
state->grid[i] = i;
state->edges = snewn(wh, unsigned short);
for (i = 0; i < wh; i++)
state->edges[i] = 0;
state->numbers = snew(struct game_numbers);
state->numbers->refcount = 1;
state->numbers->numbers = snewn(wh, int);
for (i = 0; i < wh; i++) {
assert(*desc);
if (*desc >= '0' && *desc <= '9')
j = *desc++ - '0';
else {
assert(*desc == '[');
desc++;
j = atoi(desc);
while (*desc && isdigit((unsigned char)*desc)) desc++;
assert(*desc == ']');
desc++;
}
assert(j >= 0 && j <= n);
state->numbers->numbers[i] = j;
}
state->completed = state->cheated = FALSE;
return state;
}
static game_state *dup_game(game_state *state)
{
int n = state->params.n, w = n+2, h = n+1, wh = w*h;
game_state *ret = snew(game_state);
ret->params = state->params;
ret->w = state->w;
ret->h = state->h;
ret->grid = snewn(wh, int);
memcpy(ret->grid, state->grid, wh * sizeof(int));
ret->edges = snewn(wh, unsigned short);
memcpy(ret->edges, state->edges, wh * sizeof(unsigned short));
ret->numbers = state->numbers;
ret->numbers->refcount++;
ret->completed = state->completed;
ret->cheated = state->cheated;
return ret;
}
static void free_game(game_state *state)
{
sfree(state->grid);
sfree(state->edges);
if (--state->numbers->refcount <= 0) {
sfree(state->numbers->numbers);
sfree(state->numbers);
}
sfree(state);
}
static char *solve_game(game_state *state, game_state *currstate,
char *aux, char **error)
{
int n = state->params.n, w = n+2, h = n+1, wh = w*h;
int *placements;
char *ret;
int retlen, retsize;
int i, v;
char buf[80];
int extra;
if (aux) {
retsize = 256;
ret = snewn(retsize, char);
retlen = sprintf(ret, "S");
for (i = 0; i < wh; i++) {
if (aux[i] == 'L')
extra = sprintf(buf, ";D%d,%d", i, i+1);
else if (aux[i] == 'T')
extra = sprintf(buf, ";D%d,%d", i, i+w);
else
continue;
if (retlen + extra + 1 >= retsize) {
retsize = retlen + extra + 256;
ret = sresize(ret, retsize, char);
}
strcpy(ret + retlen, buf);
retlen += extra;
}
} else {
placements = snewn(wh*2, int);
for (i = 0; i < wh*2; i++)
placements[i] = -3;
solver(w, h, n, state->numbers->numbers, placements);
/*
* First make a pass putting in edges for -1, then make a pass
* putting in dominoes for +1.
*/
retsize = 256;
ret = snewn(retsize, char);
retlen = sprintf(ret, "S");
for (v = -1; v <= +1; v += 2)
for (i = 0; i < wh*2; i++)
if (placements[i] == v) {
int p1 = i / 2;
int p2 = (i & 1) ? p1+1 : p1+w;
extra = sprintf(buf, ";%c%d,%d",
(int)(v==-1 ? 'E' : 'D'), p1, p2);
if (retlen + extra + 1 >= retsize) {
retsize = retlen + extra + 256;
ret = sresize(ret, retsize, char);
}
strcpy(ret + retlen, buf);
retlen += extra;
}
sfree(placements);
}
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 cur_x, cur_y, cur_visible;
};
static game_ui *new_ui(game_state *state)
{
game_ui *ui = snew(game_ui);
ui->cur_x = ui->cur_y = 0;
ui->cur_visible = 0;
return ui;
}
static void free_ui(game_ui *ui)
{
sfree(ui);
}
static char *encode_ui(game_ui *ui)
{
return NULL;
}
static void decode_ui(game_ui *ui, char *encoding)
{
}
static void game_changed_state(game_ui *ui, game_state *oldstate,
game_state *newstate)
{
if (!oldstate->completed && newstate->completed)
ui->cur_visible = 0;
}
#define PREFERRED_TILESIZE 32
#define TILESIZE (ds->tilesize)
#define BORDER (TILESIZE * 3 / 4)
#define DOMINO_GUTTER (TILESIZE / 16)
#define DOMINO_RADIUS (TILESIZE / 8)
#define DOMINO_COFFSET (DOMINO_GUTTER + DOMINO_RADIUS)
#define CURSOR_RADIUS (TILESIZE / 4)
#define COORD(x) ( (x) * TILESIZE + BORDER )
#define FROMCOORD(x) ( ((x) - BORDER + TILESIZE) / TILESIZE - 1 )
struct game_drawstate {
int started;
int w, h, tilesize;
unsigned long *visible;
};
static char *interpret_move(game_state *state, game_ui *ui, game_drawstate *ds,
int x, int y, int button)
{
int w = state->w, h = state->h;
char buf[80];
/*
* A left-click between two numbers toggles a domino covering
* them. A right-click toggles an edge.
*/
if (button == LEFT_BUTTON || button == RIGHT_BUTTON) {
int tx = FROMCOORD(x), ty = FROMCOORD(y), t = ty*w+tx;
int dx, dy;
int d1, d2;
if (tx < 0 || tx >= w || ty < 0 || ty >= h)
return NULL;
/*
* Now we know which square the click was in, decide which
* edge of the square it was closest to.
*/
dx = 2 * (x - COORD(tx)) - TILESIZE;
dy = 2 * (y - COORD(ty)) - TILESIZE;
if (abs(dx) > abs(dy) && dx < 0 && tx > 0)
d1 = t - 1, d2 = t; /* clicked in right side of domino */
else if (abs(dx) > abs(dy) && dx > 0 && tx+1 < w)
d1 = t, d2 = t + 1; /* clicked in left side of domino */
else if (abs(dy) > abs(dx) && dy < 0 && ty > 0)
d1 = t - w, d2 = t; /* clicked in bottom half of domino */
else if (abs(dy) > abs(dx) && dy > 0 && ty+1 < h)
d1 = t, d2 = t + w; /* clicked in top half of domino */
else
return NULL;
/*
* We can't mark an edge next to any domino.
*/
if (button == RIGHT_BUTTON &&
(state->grid[d1] != d1 || state->grid[d2] != d2))
return NULL;
ui->cur_visible = 0;
sprintf(buf, "%c%d,%d", (int)(button == RIGHT_BUTTON ? 'E' : 'D'), d1, d2);
return dupstr(buf);
} else if (IS_CURSOR_MOVE(button)) {
ui->cur_visible = 1;
move_cursor(button, &ui->cur_x, &ui->cur_y, 2*w-1, 2*h-1, 0);
return "";
} else if (IS_CURSOR_SELECT(button)) {
int d1, d2;
if (!((ui->cur_x ^ ui->cur_y) & 1))
return NULL; /* must have exactly one dimension odd */
d1 = (ui->cur_y / 2) * w + (ui->cur_x / 2);
d2 = ((ui->cur_y+1) / 2) * w + ((ui->cur_x+1) / 2);
/*
* We can't mark an edge next to any domino.
*/
if (button == CURSOR_SELECT2 &&
(state->grid[d1] != d1 || state->grid[d2] != d2))
return NULL;
sprintf(buf, "%c%d,%d", (int)(button == CURSOR_SELECT2 ? 'E' : 'D'), d1, d2);
return dupstr(buf);
}
return NULL;
}
static game_state *execute_move(game_state *state, char *move)
{
int n = state->params.n, w = n+2, h = n+1, wh = w*h;
int d1, d2, d3, p;
game_state *ret = dup_game(state);
while (*move) {
if (move[0] == 'S') {
int i;
ret->cheated = TRUE;
/*
* Clear the existing edges and domino placements. We
* expect the S to be followed by other commands.
*/
for (i = 0; i < wh; i++) {
ret->grid[i] = i;
ret->edges[i] = 0;
}
move++;
} else if (move[0] == 'D' &&
sscanf(move+1, "%d,%d%n", &d1, &d2, &p) == 2 &&
d1 >= 0 && d1 < wh && d2 >= 0 && d2 < wh && d1 < d2) {
/*
* Toggle domino presence between d1 and d2.
*/
if (ret->grid[d1] == d2) {
assert(ret->grid[d2] == d1);
ret->grid[d1] = d1;
ret->grid[d2] = d2;
} else {
/*
* Erase any dominoes that might overlap the new one.
*/
d3 = ret->grid[d1];
if (d3 != d1)
ret->grid[d3] = d3;
d3 = ret->grid[d2];
if (d3 != d2)
ret->grid[d3] = d3;
/*
* Place the new one.
*/
ret->grid[d1] = d2;
ret->grid[d2] = d1;
/*
* Destroy any edges lurking around it.
*/
if (ret->edges[d1] & EDGE_L) {
assert(d1 - 1 >= 0);
ret->edges[d1 - 1] &= ~EDGE_R;
}
if (ret->edges[d1] & EDGE_R) {
assert(d1 + 1 < wh);
ret->edges[d1 + 1] &= ~EDGE_L;
}
if (ret->edges[d1] & EDGE_T) {
assert(d1 - w >= 0);
ret->edges[d1 - w] &= ~EDGE_B;
}
if (ret->edges[d1] & EDGE_B) {
assert(d1 + 1 < wh);
ret->edges[d1 + w] &= ~EDGE_T;
}
ret->edges[d1] = 0;
if (ret->edges[d2] & EDGE_L) {
assert(d2 - 1 >= 0);
ret->edges[d2 - 1] &= ~EDGE_R;
}
if (ret->edges[d2] & EDGE_R) {
assert(d2 + 1 < wh);
ret->edges[d2 + 1] &= ~EDGE_L;
}
if (ret->edges[d2] & EDGE_T) {
assert(d2 - w >= 0);
ret->edges[d2 - w] &= ~EDGE_B;
}
if (ret->edges[d2] & EDGE_B) {
assert(d2 + 1 < wh);
ret->edges[d2 + w] &= ~EDGE_T;
}
ret->edges[d2] = 0;
}
move += p+1;
} else if (move[0] == 'E' &&
sscanf(move+1, "%d,%d%n", &d1, &d2, &p) == 2 &&
d1 >= 0 && d1 < wh && d2 >= 0 && d2 < wh && d1 < d2 &&
ret->grid[d1] == d1 && ret->grid[d2] == d2) {
/*
* Toggle edge presence between d1 and d2.
*/
if (d2 == d1 + 1) {
ret->edges[d1] ^= EDGE_R;
ret->edges[d2] ^= EDGE_L;
} else {
ret->edges[d1] ^= EDGE_B;
ret->edges[d2] ^= EDGE_T;
}
move += p+1;
} else {
free_game(ret);
return NULL;
}
if (*move) {
if (*move != ';') {
free_game(ret);
return NULL;
}
move++;
}
}
/*
* After modifying the grid, check completion.
*/
if (!ret->completed) {
int i, ok = 0;
unsigned char *used = snewn(TRI(n+1), unsigned char);
memset(used, 0, TRI(n+1));
for (i = 0; i < wh; i++)
if (ret->grid[i] > i) {
int n1, n2, di;
n1 = ret->numbers->numbers[i];
n2 = ret->numbers->numbers[ret->grid[i]];
di = DINDEX(n1, n2);
assert(di >= 0 && di < TRI(n+1));
if (!used[di]) {
used[di] = 1;
ok++;
}
}
sfree(used);
if (ok == DCOUNT(n))
ret->completed = TRUE;
}
return ret;
}
/* ----------------------------------------------------------------------
* Drawing routines.
*/
static void game_compute_size(game_params *params, int tilesize,
int *x, int *y)
{
int n = params->n, w = n+2, h = n+1;
/* Ick: fake up `ds->tilesize' for macro expansion purposes */
struct { int tilesize; } ads, *ds = &ads;
ads.tilesize = tilesize;
*x = w * TILESIZE + 2*BORDER;
*y = h * TILESIZE + 2*BORDER;
}
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_TEXT * 3 + 0] = 0.0F;
ret[COL_TEXT * 3 + 1] = 0.0F;
ret[COL_TEXT * 3 + 2] = 0.0F;
ret[COL_DOMINO * 3 + 0] = 0.0F;
ret[COL_DOMINO * 3 + 1] = 0.0F;
ret[COL_DOMINO * 3 + 2] = 0.0F;
ret[COL_DOMINOCLASH * 3 + 0] = 0.5F;
ret[COL_DOMINOCLASH * 3 + 1] = 0.0F;
ret[COL_DOMINOCLASH * 3 + 2] = 0.0F;
ret[COL_DOMINOTEXT * 3 + 0] = 1.0F;
ret[COL_DOMINOTEXT * 3 + 1] = 1.0F;
ret[COL_DOMINOTEXT * 3 + 2] = 1.0F;
ret[COL_EDGE * 3 + 0] = ret[COL_BACKGROUND * 3 + 0] * 2 / 3;
ret[COL_EDGE * 3 + 1] = ret[COL_BACKGROUND * 3 + 1] * 2 / 3;
ret[COL_EDGE * 3 + 2] = ret[COL_BACKGROUND * 3 + 2] * 2 / 3;
*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->started = FALSE;
ds->w = state->w;
ds->h = state->h;
ds->visible = snewn(ds->w * ds->h, unsigned long);
ds->tilesize = 0; /* not decided yet */
for (i = 0; i < ds->w * ds->h; i++)
ds->visible[i] = 0xFFFF;
return ds;
}
static void game_free_drawstate(drawing *dr, game_drawstate *ds)
{
sfree(ds->visible);
sfree(ds);
}
enum {
TYPE_L,
TYPE_R,
TYPE_T,
TYPE_B,
TYPE_BLANK,
TYPE_MASK = 0x0F
};
/* These flags must be disjoint with:
* the above enum (TYPE_*) [0x000 -- 0x00F]
* EDGE_* [0x100 -- 0xF00]
* and must fit into an unsigned long (32 bits).
*/
#define DF_FLASH 0x40
#define DF_CLASH 0x80
#define DF_CURSOR 0x01000
#define DF_CURSOR_USEFUL 0x02000
#define DF_CURSOR_XBASE 0x10000
#define DF_CURSOR_XMASK 0x30000
#define DF_CURSOR_YBASE 0x40000
#define DF_CURSOR_YMASK 0xC0000
#define CEDGE_OFF (TILESIZE / 8)
#define IS_EMPTY(s,x,y) ((s)->grid[(y)*(s)->w+(x)] == ((y)*(s)->w+(x)))
static void draw_tile(drawing *dr, game_drawstate *ds, game_state *state,
int x, int y, int type)
{
int w = state->w /*, h = state->h */;
int cx = COORD(x), cy = COORD(y);
int nc;
char str[80];
int flags;
clip(dr, cx, cy, TILESIZE, TILESIZE);
draw_rect(dr, cx, cy, TILESIZE, TILESIZE, COL_BACKGROUND);
flags = type &~ TYPE_MASK;
type &= TYPE_MASK;
if (type != TYPE_BLANK) {
int i, bg;
/*
* Draw one end of a domino. This is composed of:
*
* - two filled circles (rounded corners)
* - two rectangles
* - a slight shift in the number
*/
if (flags & DF_CLASH)
bg = COL_DOMINOCLASH;
else
bg = COL_DOMINO;
nc = COL_DOMINOTEXT;
if (flags & DF_FLASH) {
int tmp = nc;
nc = bg;
bg = tmp;
}
if (type == TYPE_L || type == TYPE_T)
draw_circle(dr, cx+DOMINO_COFFSET, cy+DOMINO_COFFSET,
DOMINO_RADIUS, bg, bg);
if (type == TYPE_R || type == TYPE_T)
draw_circle(dr, cx+TILESIZE-1-DOMINO_COFFSET, cy+DOMINO_COFFSET,
DOMINO_RADIUS, bg, bg);
if (type == TYPE_L || type == TYPE_B)
draw_circle(dr, cx+DOMINO_COFFSET, cy+TILESIZE-1-DOMINO_COFFSET,
DOMINO_RADIUS, bg, bg);
if (type == TYPE_R || type == TYPE_B)
draw_circle(dr, cx+TILESIZE-1-DOMINO_COFFSET,
cy+TILESIZE-1-DOMINO_COFFSET,
DOMINO_RADIUS, bg, bg);
for (i = 0; i < 2; i++) {
int x1, y1, x2, y2;
x1 = cx + (i ? DOMINO_GUTTER : DOMINO_COFFSET);
y1 = cy + (i ? DOMINO_COFFSET : DOMINO_GUTTER);
x2 = cx + TILESIZE-1 - (i ? DOMINO_GUTTER : DOMINO_COFFSET);
y2 = cy + TILESIZE-1 - (i ? DOMINO_COFFSET : DOMINO_GUTTER);
if (type == TYPE_L)
x2 = cx + TILESIZE + TILESIZE/16;
else if (type == TYPE_R)
x1 = cx - TILESIZE/16;
else if (type == TYPE_T)
y2 = cy + TILESIZE + TILESIZE/16;
else if (type == TYPE_B)
y1 = cy - TILESIZE/16;
draw_rect(dr, x1, y1, x2-x1+1, y2-y1+1, bg);
}
} else {
if (flags & EDGE_T)
draw_rect(dr, cx+DOMINO_GUTTER, cy,
TILESIZE-2*DOMINO_GUTTER, 1, COL_EDGE);
if (flags & EDGE_B)
draw_rect(dr, cx+DOMINO_GUTTER, cy+TILESIZE-1,
TILESIZE-2*DOMINO_GUTTER, 1, COL_EDGE);
if (flags & EDGE_L)
draw_rect(dr, cx, cy+DOMINO_GUTTER,
1, TILESIZE-2*DOMINO_GUTTER, COL_EDGE);
if (flags & EDGE_R)
draw_rect(dr, cx+TILESIZE-1, cy+DOMINO_GUTTER,
1, TILESIZE-2*DOMINO_GUTTER, COL_EDGE);
nc = COL_TEXT;
}
if (flags & DF_CURSOR) {
int curx = ((flags & DF_CURSOR_XMASK) / DF_CURSOR_XBASE) & 3;
int cury = ((flags & DF_CURSOR_YMASK) / DF_CURSOR_YBASE) & 3;
int ox = cx + curx*TILESIZE/2;
int oy = cy + cury*TILESIZE/2;
draw_rect_corners(dr, ox, oy, CURSOR_RADIUS, nc);
if (flags & DF_CURSOR_USEFUL)
draw_rect_corners(dr, ox, oy, CURSOR_RADIUS+1, nc);
}
sprintf(str, "%d", state->numbers->numbers[y*w+x]);
draw_text(dr, cx+TILESIZE/2, cy+TILESIZE/2, FONT_VARIABLE, TILESIZE/2,
ALIGN_HCENTRE | ALIGN_VCENTRE, nc, str);
draw_update(dr, cx, cy, TILESIZE, TILESIZE);
unclip(dr);
}
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 n = state->params.n, w = state->w, h = state->h, wh = w*h;
int x, y, i;
unsigned char *used;
if (!ds->started) {
int pw, ph;
game_compute_size(&state->params, TILESIZE, &pw, &ph);
draw_rect(dr, 0, 0, pw, ph, COL_BACKGROUND);
draw_update(dr, 0, 0, pw, ph);
ds->started = TRUE;
}
/*
* See how many dominoes of each type there are, so we can
* highlight clashes in red.
*/
used = snewn(TRI(n+1), unsigned char);
memset(used, 0, TRI(n+1));
for (i = 0; i < wh; i++)
if (state->grid[i] > i) {
int n1, n2, di;
n1 = state->numbers->numbers[i];
n2 = state->numbers->numbers[state->grid[i]];
di = DINDEX(n1, n2);
assert(di >= 0 && di < TRI(n+1));
if (used[di] < 2)
used[di]++;
}
for (y = 0; y < h; y++)
for (x = 0; x < w; x++) {
int n = y*w+x;
int n1, n2, di;
unsigned long c;
if (state->grid[n] == n-1)
c = TYPE_R;
else if (state->grid[n] == n+1)
c = TYPE_L;
else if (state->grid[n] == n-w)
c = TYPE_B;
else if (state->grid[n] == n+w)
c = TYPE_T;
else
c = TYPE_BLANK;
if (c != TYPE_BLANK) {
n1 = state->numbers->numbers[n];
n2 = state->numbers->numbers[state->grid[n]];
di = DINDEX(n1, n2);
if (used[di] > 1)
c |= DF_CLASH; /* highlight a clash */
} else {
c |= state->edges[n];
}
if (flashtime != 0)
c |= DF_FLASH; /* we're flashing */
if (ui->cur_visible) {
unsigned curx = (unsigned)(ui->cur_x - (2*x-1));
unsigned cury = (unsigned)(ui->cur_y - (2*y-1));
if (curx < 3 && cury < 3) {
c |= (DF_CURSOR |
(curx * DF_CURSOR_XBASE) |
(cury * DF_CURSOR_YBASE));
if ((ui->cur_x ^ ui->cur_y) & 1)
c |= DF_CURSOR_USEFUL;
}
}
if (ds->visible[n] != c) {
draw_tile(dr, ds, state, x, y, c);
ds->visible[n] = c;
}
}
sfree(used);
}
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 6mm squares by default.
*/
game_compute_size(params, 600, &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 c, x, y;
/* Ick: fake up `ds->tilesize' for macro expansion purposes */
game_drawstate ads, *ds = &ads;
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_TEXT);
c = print_mono_colour(dr, 0); assert(c == COL_DOMINO);
c = print_mono_colour(dr, 0); assert(c == COL_DOMINOCLASH);
c = print_mono_colour(dr, 1); assert(c == COL_DOMINOTEXT);
c = print_mono_colour(dr, 0); assert(c == COL_EDGE);
for (y = 0; y < h; y++)
for (x = 0; x < w; x++) {
int n = y*w+x;
unsigned long c;
if (state->grid[n] == n-1)
c = TYPE_R;
else if (state->grid[n] == n+1)
c = TYPE_L;
else if (state->grid[n] == n-w)
c = TYPE_B;
else if (state->grid[n] == n+w)
c = TYPE_T;
else
c = TYPE_BLANK;
draw_tile(dr, ds, state, x, y, c);
}
}
#ifdef COMBINED
#define thegame dominosa
#endif
const struct game thegame = {
"Dominosa", "games.dominosa", "dominosa",
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_TILESIZE, 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,
0, /* flags */
};
/* vim: set shiftwidth=4 :set textwidth=80: */