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puzzles/rect.c
Simon Tatham cc54553226 Rather than each game backend file exporting a whole load of 
functions and a couple of variables, now each one exports a single
structure containing a load of function pointers and said variables.
This should make it easy to support platforms on which it's sensible
to compile all the puzzles into a single monolithic application. The
two existing platforms are still one-binary-per-game.

[originally from svn r5126]
2005-01-17 13:48:57 +00:00

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/*
* rect.c: Puzzle from nikoli.co.jp. You have a square grid with
* numbers in some squares; you must divide the square grid up into
* variously sized rectangles, such that every rectangle contains
* exactly one numbered square and the area of each rectangle is
* equal to the number contained in it.
*/
/*
* TODO:
*
* - Improve on singleton removal by making an aesthetic choice
* about which of the options to take.
*
* - When doing the 3x3 trick in singleton removal, limit the size
* of the generated rectangles in accordance with the max
* rectangle size.
*
* - It might be interesting to deliberately try to place
* numbers so as to reduce alternative solution patterns. I
* doubt we can do a perfect job of this, but we can make a
* start by, for example, noticing pairs of 2-rects
* alongside one another and _not_ putting their numbers at
* opposite ends.
*
* - If we start by sorting the rectlist in descending order
* of area, we might be able to bias our random number
* selection to produce a few large rectangles more often
* than oodles of small ones? Unsure, but might be worth a
* try.
*/
#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_CORRECT,
COL_LINE,
COL_TEXT,
COL_GRID,
COL_DRAG,
NCOLOURS
};
struct game_params {
int w, h;
float expandfactor;
};
#define INDEX(state, x, y) (((y) * (state)->w) + (x))
#define index(state, a, x, y) ((a) [ INDEX(state,x,y) ])
#define grid(state,x,y) index(state, (state)->grid, x, y)
#define vedge(state,x,y) index(state, (state)->vedge, x, y)
#define hedge(state,x,y) index(state, (state)->hedge, x, y)
#define CRANGE(state,x,y,dx,dy) ( (x) >= dx && (x) < (state)->w && \
(y) >= dy && (y) < (state)->h )
#define RANGE(state,x,y) CRANGE(state,x,y,0,0)
#define HRANGE(state,x,y) CRANGE(state,x,y,0,1)
#define VRANGE(state,x,y) CRANGE(state,x,y,1,0)
#define TILE_SIZE 24
#define BORDER 18
#define CORNER_TOLERANCE 0.15F
#define CENTRE_TOLERANCE 0.15F
#define FLASH_TIME 0.13F
#define COORD(x) ( (x) * TILE_SIZE + BORDER )
#define FROMCOORD(x) ( ((x) - BORDER) / TILE_SIZE )
struct game_state {
int w, h;
int *grid; /* contains the numbers */
unsigned char *vedge; /* (w+1) x h */
unsigned char *hedge; /* w x (h+1) */
int completed;
};
static game_params *default_params(void)
{
game_params *ret = snew(game_params);
ret->w = ret->h = 7;
ret->expandfactor = 0.0F;
return ret;
}
static int game_fetch_preset(int i, char **name, game_params **params)
{
game_params *ret;
int w, h;
char buf[80];
switch (i) {
case 0: w = 7, h = 7; break;
case 1: w = 11, h = 11; break;
case 2: w = 15, h = 15; break;
case 3: w = 19, h = 19; break;
default: return FALSE;
}
sprintf(buf, "%dx%d", w, h);
*name = dupstr(buf);
*params = ret = snew(game_params);
ret->w = w;
ret->h = h;
ret->expandfactor = 0.0F;
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 game_params *decode_params(char const *string)
{
game_params *ret = default_params();
ret->w = ret->h = atoi(string);
ret->expandfactor = 0.0F;
while (*string && isdigit((unsigned char)*string)) string++;
if (*string == 'x') {
string++;
ret->h = atoi(string);
while (*string && isdigit((unsigned char)*string)) string++;
}
if (*string == 'e') {
string++;
ret->expandfactor = atof(string);
}
return ret;
}
static char *encode_params(game_params *params)
{
char data[256];
sprintf(data, "%dx%d", params->w, params->h);
return dupstr(data);
}
static config_item *game_configure(game_params *params)
{
config_item *ret;
char buf[80];
ret = snewn(5, 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 = "Expansion factor";
ret[2].type = C_STRING;
sprintf(buf, "%g", params->expandfactor);
ret[2].sval = dupstr(buf);
ret[2].ival = 0;
ret[3].name = NULL;
ret[3].type = C_END;
ret[3].sval = NULL;
ret[3].ival = 0;
return ret;
}
static game_params *custom_params(config_item *cfg)
{
game_params *ret = snew(game_params);
ret->w = atoi(cfg[0].sval);
ret->h = atoi(cfg[1].sval);
ret->expandfactor = atof(cfg[2].sval);
return ret;
}
static char *validate_params(game_params *params)
{
if (params->w <= 0 && params->h <= 0)
return "Width and height must both be greater than zero";
if (params->w < 2 && params->h < 2)
return "Grid area must be greater than one";
if (params->expandfactor < 0.0F)
return "Expansion factor may not be negative";
return NULL;
}
struct rect {
int x, y;
int w, h;
};
struct rectlist {
struct rect *rects;
int n;
};
static struct rectlist *get_rectlist(game_params *params, int *grid)
{
int rw, rh;
int x, y;
int maxarea;
struct rect *rects = NULL;
int nrects = 0, rectsize = 0;
/*
* Maximum rectangle area is 1/6 of total grid size, unless
* this means we can't place any rectangles at all in which
* case we set it to 2 at minimum.
*/
maxarea = params->w * params->h / 6;
if (maxarea < 2)
maxarea = 2;
for (rw = 1; rw <= params->w; rw++)
for (rh = 1; rh <= params->h; rh++) {
if (rw * rh > maxarea)
continue;
if (rw * rh == 1)
continue;
for (x = 0; x <= params->w - rw; x++)
for (y = 0; y <= params->h - rh; y++) {
if (nrects >= rectsize) {
rectsize = nrects + 256;
rects = sresize(rects, rectsize, struct rect);
}
rects[nrects].x = x;
rects[nrects].y = y;
rects[nrects].w = rw;
rects[nrects].h = rh;
nrects++;
}
}
if (nrects > 0) {
struct rectlist *ret;
ret = snew(struct rectlist);
ret->rects = rects;
ret->n = nrects;
return ret;
} else {
assert(rects == NULL); /* hence no need to free */
return NULL;
}
}
static void free_rectlist(struct rectlist *list)
{
sfree(list->rects);
sfree(list);
}
static void place_rect(game_params *params, int *grid, struct rect r)
{
int idx = INDEX(params, r.x, r.y);
int x, y;
for (x = r.x; x < r.x+r.w; x++)
for (y = r.y; y < r.y+r.h; y++) {
index(params, grid, x, y) = idx;
}
#ifdef GENERATION_DIAGNOSTICS
printf(" placing rectangle at (%d,%d) size %d x %d\n",
r.x, r.y, r.w, r.h);
#endif
}
static struct rect find_rect(game_params *params, int *grid, int x, int y)
{
int idx, w, h;
struct rect r;
/*
* Find the top left of the rectangle.
*/
idx = index(params, grid, x, y);
if (idx < 0) {
r.x = x;
r.y = y;
r.w = r.h = 1;
return r; /* 1x1 singleton here */
}
y = idx / params->w;
x = idx % params->w;
/*
* Find the width and height of the rectangle.
*/
for (w = 1;
(x+w < params->w && index(params,grid,x+w,y)==idx);
w++);
for (h = 1;
(y+h < params->h && index(params,grid,x,y+h)==idx);
h++);
r.x = x;
r.y = y;
r.w = w;
r.h = h;
return r;
}
#ifdef GENERATION_DIAGNOSTICS
static void display_grid(game_params *params, int *grid, int *numbers, int all)
{
unsigned char *egrid = snewn((params->w*2+3) * (params->h*2+3),
unsigned char);
int x, y;
int r = (params->w*2+3);
memset(egrid, 0, (params->w*2+3) * (params->h*2+3));
for (x = 0; x < params->w; x++)
for (y = 0; y < params->h; y++) {
int i = index(params, grid, x, y);
if (x == 0 || index(params, grid, x-1, y) != i)
egrid[(2*y+2) * r + (2*x+1)] = 1;
if (x == params->w-1 || index(params, grid, x+1, y) != i)
egrid[(2*y+2) * r + (2*x+3)] = 1;
if (y == 0 || index(params, grid, x, y-1) != i)
egrid[(2*y+1) * r + (2*x+2)] = 1;
if (y == params->h-1 || index(params, grid, x, y+1) != i)
egrid[(2*y+3) * r + (2*x+2)] = 1;
}
for (y = 1; y < 2*params->h+2; y++) {
for (x = 1; x < 2*params->w+2; x++) {
if (!((y|x)&1)) {
int k = numbers ? index(params, numbers, x/2-1, y/2-1) : 0;
if (k || (all && numbers)) printf("%2d", k); else printf(" ");
} else if (!((y&x)&1)) {
int v = egrid[y*r+x];
if ((y&1) && v) v = '-';
if ((x&1) && v) v = '|';
if (!v) v = ' ';
putchar(v);
if (!(x&1)) putchar(v);
} else {
int c, d = 0;
if (egrid[y*r+(x+1)]) d |= 1;
if (egrid[(y-1)*r+x]) d |= 2;
if (egrid[y*r+(x-1)]) d |= 4;
if (egrid[(y+1)*r+x]) d |= 8;
c = " ??+?-++?+|+++++"[d];
putchar(c);
if (!(x&1)) putchar(c);
}
}
putchar('\n');
}
sfree(egrid);
}
#endif
static char *new_game_seed(game_params *params, random_state *rs)
{
int *grid, *numbers;
struct rectlist *list;
int x, y, y2, y2last, yx, run, i;
char *seed, *p;
game_params params2real, *params2 = &params2real;
/*
* Set up the smaller width and height which we will use to
* generate the base grid.
*/
params2->w = params->w / (1.0F + params->expandfactor);
if (params2->w < 2 && params->w >= 2) params2->w = 2;
params2->h = params->h / (1.0F + params->expandfactor);
if (params2->h < 2 && params->h >= 2) params2->h = 2;
grid = snewn(params2->w * params2->h, int);
for (y = 0; y < params2->h; y++)
for (x = 0; x < params2->w; x++) {
index(params2, grid, x, y) = -1;
}
list = get_rectlist(params2, grid);
assert(list != NULL);
/*
* Place rectangles until we can't any more.
*/
while (list->n > 0) {
int i, m;
struct rect r;
/*
* Pick a random rectangle.
*/
i = random_upto(rs, list->n);
r = list->rects[i];
/*
* Place it.
*/
place_rect(params2, grid, r);
/*
* Winnow the list by removing any rectangles which
* overlap this one.
*/
m = 0;
for (i = 0; i < list->n; i++) {
struct rect s = list->rects[i];
if (s.x+s.w <= r.x || r.x+r.w <= s.x ||
s.y+s.h <= r.y || r.y+r.h <= s.y)
list->rects[m++] = s;
}
list->n = m;
}
free_rectlist(list);
/*
* Deal with singleton spaces remaining in the grid, one by
* one.
*
* We do this by making a local change to the layout. There are
* several possibilities:
*
* +-----+-----+ Here, we can remove the singleton by
* | | | extending the 1x2 rectangle below it
* +--+--+-----+ into a 1x3.
* | | | |
* | +--+ |
* | | | |
* | | | |
* | | | |
* +--+--+-----+
*
* +--+--+--+ Here, that trick doesn't work: there's no
* | | | 1 x n rectangle with the singleton at one
* | | | end. Instead, we extend a 1 x n rectangle
* | | | _out_ from the singleton, shaving a layer
* +--+--+ | off the end of another rectangle. So if we
* | | | | extended up, we'd make our singleton part
* | +--+--+ of a 1x3 and generate a 1x2 where the 2x2
* | | | used to be; or we could extend right into
* +--+-----+ a 2x1, turning the 1x3 into a 1x2.
*
* +-----+--+ Here, we can't even do _that_, since any
* | | | direction we choose to extend the singleton
* +--+--+ | will produce a new singleton as a result of
* | | | | truncating one of the size-2 rectangles.
* | +--+--+ Fortunately, this case can _only_ occur when
* | | | a singleton is surrounded by four size-2s
* +--+-----+ in this fashion; so instead we can simply
* replace the whole section with a single 3x3.
*/
for (x = 0; x < params2->w; x++) {
for (y = 0; y < params2->h; y++) {
if (index(params2, grid, x, y) < 0) {
int dirs[4], ndirs;
#ifdef GENERATION_DIAGNOSTICS
display_grid(params2, grid, NULL, FALSE);
printf("singleton at %d,%d\n", x, y);
#endif
/*
* Check in which directions we can feasibly extend
* the singleton. We can extend in a particular
* direction iff either:
*
* - the rectangle on that side of the singleton
* is not 2x1, and we are at one end of the edge
* of it we are touching
*
* - it is 2x1 but we are on its short side.
*
* FIXME: we could plausibly choose between these
* based on the sizes of the rectangles they would
* create?
*/
ndirs = 0;
if (x < params2->w-1) {
struct rect r = find_rect(params2, grid, x+1, y);
if ((r.w * r.h > 2 && (r.y==y || r.y+r.h-1==y)) || r.h==1)
dirs[ndirs++] = 1; /* right */
}
if (y > 0) {
struct rect r = find_rect(params2, grid, x, y-1);
if ((r.w * r.h > 2 && (r.x==x || r.x+r.w-1==x)) || r.w==1)
dirs[ndirs++] = 2; /* up */
}
if (x > 0) {
struct rect r = find_rect(params2, grid, x-1, y);
if ((r.w * r.h > 2 && (r.y==y || r.y+r.h-1==y)) || r.h==1)
dirs[ndirs++] = 4; /* left */
}
if (y < params2->h-1) {
struct rect r = find_rect(params2, grid, x, y+1);
if ((r.w * r.h > 2 && (r.x==x || r.x+r.w-1==x)) || r.w==1)
dirs[ndirs++] = 8; /* down */
}
if (ndirs > 0) {
int which, dir;
struct rect r1, r2;
which = random_upto(rs, ndirs);
dir = dirs[which];
switch (dir) {
case 1: /* right */
assert(x < params2->w+1);
#ifdef GENERATION_DIAGNOSTICS
printf("extending right\n");
#endif
r1 = find_rect(params2, grid, x+1, y);
r2.x = x;
r2.y = y;
r2.w = 1 + r1.w;
r2.h = 1;
if (r1.y == y)
r1.y++;
r1.h--;
break;
case 2: /* up */
assert(y > 0);
#ifdef GENERATION_DIAGNOSTICS
printf("extending up\n");
#endif
r1 = find_rect(params2, grid, x, y-1);
r2.x = x;
r2.y = r1.y;
r2.w = 1;
r2.h = 1 + r1.h;
if (r1.x == x)
r1.x++;
r1.w--;
break;
case 4: /* left */
assert(x > 0);
#ifdef GENERATION_DIAGNOSTICS
printf("extending left\n");
#endif
r1 = find_rect(params2, grid, x-1, y);
r2.x = r1.x;
r2.y = y;
r2.w = 1 + r1.w;
r2.h = 1;
if (r1.y == y)
r1.y++;
r1.h--;
break;
case 8: /* down */
assert(y < params2->h+1);
#ifdef GENERATION_DIAGNOSTICS
printf("extending down\n");
#endif
r1 = find_rect(params2, grid, x, y+1);
r2.x = x;
r2.y = y;
r2.w = 1;
r2.h = 1 + r1.h;
if (r1.x == x)
r1.x++;
r1.w--;
break;
}
if (r1.h > 0 && r1.w > 0)
place_rect(params2, grid, r1);
place_rect(params2, grid, r2);
} else {
#ifndef NDEBUG
/*
* Sanity-check that there really is a 3x3
* rectangle surrounding this singleton and it
* contains absolutely everything we could
* possibly need.
*/
{
int xx, yy;
assert(x > 0 && x < params2->w-1);
assert(y > 0 && y < params2->h-1);
for (xx = x-1; xx <= x+1; xx++)
for (yy = y-1; yy <= y+1; yy++) {
struct rect r = find_rect(params2,grid,xx,yy);
assert(r.x >= x-1);
assert(r.y >= y-1);
assert(r.x+r.w-1 <= x+1);
assert(r.y+r.h-1 <= y+1);
}
}
#endif
#ifdef GENERATION_DIAGNOSTICS
printf("need the 3x3 trick\n");
#endif
/*
* FIXME: If the maximum rectangle area for
* this grid is less than 9, we ought to
* subdivide the 3x3 in some fashion. There are
* five other possibilities:
*
* - a 6 and a 3
* - a 4, a 3 and a 2
* - three 3s
* - a 3 and three 2s (two different arrangements).
*/
{
struct rect r;
r.x = x-1;
r.y = y-1;
r.w = r.h = 3;
place_rect(params2, grid, r);
}
}
}
}
}
/*
* We have now constructed a grid of the size specified in
* params2. Now we extend it into a grid of the size specified
* in params. We do this in two passes: we extend it vertically
* until it's the right height, then we transpose it, then
* extend it vertically again (getting it effectively the right
* width), then finally transpose again.
*/
for (i = 0; i < 2; i++) {
int *grid2, *expand, *where;
game_params params3real, *params3 = &params3real;
#ifdef GENERATION_DIAGNOSTICS
printf("before expansion:\n");
display_grid(params2, grid, NULL, TRUE);
#endif
/*
* Set up the new grid.
*/
grid2 = snewn(params2->w * params->h, int);
expand = snewn(params2->h-1, int);
where = snewn(params2->w, int);
params3->w = params2->w;
params3->h = params->h;
/*
* Decide which horizontal edges are going to get expanded,
* and by how much.
*/
for (y = 0; y < params2->h-1; y++)
expand[y] = 0;
for (y = params2->h; y < params->h; y++) {
x = random_upto(rs, params2->h-1);
expand[x]++;
}
#ifdef GENERATION_DIAGNOSTICS
printf("expand[] = {");
for (y = 0; y < params2->h-1; y++)
printf(" %d", expand[y]);
printf(" }\n");
#endif
/*
* Perform the expansion. The way this works is that we
* alternately:
*
* - copy a row from grid into grid2
*
* - invent some number of additional rows in grid2 where
* there was previously only a horizontal line between
* rows in grid, and make random decisions about where
* among these to place each rectangle edge that ran
* along this line.
*/
for (y = y2 = y2last = 0; y < params2->h; y++) {
/*
* Copy a single line from row y of grid into row y2 of
* grid2.
*/
for (x = 0; x < params2->w; x++) {
int val = index(params2, grid, x, y);
if (val / params2->w == y && /* rect starts on this line */
(y2 == 0 || /* we're at the very top, or... */
index(params3, grid2, x, y2-1) / params3->w < y2last
/* this rect isn't already started */))
index(params3, grid2, x, y2) =
INDEX(params3, val % params2->w, y2);
else
index(params3, grid2, x, y2) =
index(params3, grid2, x, y2-1);
}
/*
* If that was the last line, terminate the loop early.
*/
if (++y2 == params3->h)
break;
y2last = y2;
/*
* Invent some number of additional lines. First walk
* along this line working out where to put all the
* edges that coincide with it.
*/
yx = -1;
for (x = 0; x < params2->w; x++) {
if (index(params2, grid, x, y) !=
index(params2, grid, x, y+1)) {
/*
* This is a horizontal edge, so it needs
* placing.
*/
if (x == 0 ||
(index(params2, grid, x-1, y) !=
index(params2, grid, x, y) &&
index(params2, grid, x-1, y+1) !=
index(params2, grid, x, y+1))) {
/*
* Here we have the chance to make a new
* decision.
*/
yx = random_upto(rs, expand[y]+1);
} else {
/*
* Here we just reuse the previous value of
* yx.
*/
}
} else
yx = -1;
where[x] = yx;
}
for (yx = 0; yx < expand[y]; yx++) {
/*
* Invent a single row. For each square in the row,
* we copy the grid entry from the square above it,
* unless we're starting the new rectangle here.
*/
for (x = 0; x < params2->w; x++) {
if (yx == where[x]) {
int val = index(params2, grid, x, y+1);
val %= params2->w;
val = INDEX(params3, val, y2);
index(params3, grid2, x, y2) = val;
} else
index(params3, grid2, x, y2) =
index(params3, grid2, x, y2-1);
}
y2++;
}
}
sfree(expand);
sfree(where);
#ifdef GENERATION_DIAGNOSTICS
printf("after expansion:\n");
display_grid(params3, grid2, NULL, TRUE);
#endif
/*
* Transpose.
*/
params2->w = params3->h;
params2->h = params3->w;
sfree(grid);
grid = snewn(params2->w * params2->h, int);
for (x = 0; x < params2->w; x++)
for (y = 0; y < params2->h; y++) {
int idx1 = INDEX(params2, x, y);
int idx2 = INDEX(params3, y, x);
int tmp;
tmp = grid2[idx2];
tmp = (tmp % params3->w) * params2->w + (tmp / params3->w);
grid[idx1] = tmp;
}
sfree(grid2);
{
int tmp;
tmp = params->w;
params->w = params->h;
params->h = tmp;
}
#ifdef GENERATION_DIAGNOSTICS
printf("after transposition:\n");
display_grid(params2, grid, NULL, TRUE);
#endif
}
/*
* Place numbers.
*/
numbers = snewn(params->w * params->h, int);
for (y = 0; y < params->h; y++)
for (x = 0; x < params->w; x++) {
index(params, numbers, x, y) = 0;
}
for (x = 0; x < params->w; x++) {
for (y = 0; y < params->h; y++) {
int idx = INDEX(params, x, y);
if (index(params, grid, x, y) == idx) {
struct rect r = find_rect(params, grid, x, y);
int n, xx, yy;
/*
* Decide where to put the number.
*/
n = random_upto(rs, r.w*r.h);
yy = n / r.w;
xx = n % r.w;
index(params,numbers,x+xx,y+yy) = r.w*r.h;
}
}
}
#ifdef GENERATION_DIAGNOSTICS
display_grid(params, grid, numbers, FALSE);
#endif
seed = snewn(11 * params->w * params->h, char);
p = seed;
run = 0;
for (i = 0; i <= params->w * params->h; i++) {
int n = (i < params->w * params->h ? numbers[i] : -1);
if (!n)
run++;
else {
if (run) {
while (run > 0) {
int c = 'a' - 1 + run;
if (run > 26)
c = 'z';
*p++ = c;
run -= c - ('a' - 1);
}
} else {
/*
* If there's a number in the very top left or
* bottom right, there's no point putting an
* unnecessary _ before or after it.
*/
if (p > seed && n > 0)
*p++ = '_';
}
if (n > 0)
p += sprintf(p, "%d", n);
run = 0;
}
}
*p = '\0';
sfree(grid);
sfree(numbers);
return seed;
}
static char *validate_seed(game_params *params, char *seed)
{
int area = params->w * params->h;
int squares = 0;
while (*seed) {
int n = *seed++;
if (n >= 'a' && n <= 'z') {
squares += n - 'a' + 1;
} else if (n == '_') {
/* do nothing */;
} else if (n > '0' && n <= '9') {
squares++;
while (*seed >= '0' && *seed <= '9')
seed++;
} else
return "Invalid character in game specification";
}
if (squares < area)
return "Not enough data to fill grid";
if (squares > area)
return "Too much data to fit in grid";
return NULL;
}
static game_state *new_game(game_params *params, char *seed)
{
game_state *state = snew(game_state);
int x, y, i, area;
state->w = params->w;
state->h = params->h;
area = state->w * state->h;
state->grid = snewn(area, int);
state->vedge = snewn(area, unsigned char);
state->hedge = snewn(area, unsigned char);
state->completed = FALSE;
i = 0;
while (*seed) {
int n = *seed++;
if (n >= 'a' && n <= 'z') {
int run = n - 'a' + 1;
assert(i + run <= area);
while (run-- > 0)
state->grid[i++] = 0;
} else if (n == '_') {
/* do nothing */;
} else if (n > '0' && n <= '9') {
assert(i < area);
state->grid[i++] = atoi(seed-1);
while (*seed >= '0' && *seed <= '9')
seed++;
} else {
assert(!"We can't get here");
}
}
assert(i == area);
for (y = 0; y < state->h; y++)
for (x = 0; x < state->w; x++)
vedge(state,x,y) = hedge(state,x,y) = 0;
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->vedge = snewn(state->w * state->h, unsigned char);
ret->hedge = snewn(state->w * state->h, unsigned char);
ret->grid = snewn(state->w * state->h, int);
ret->completed = state->completed;
memcpy(ret->grid, state->grid, state->w * state->h * sizeof(int));
memcpy(ret->vedge, state->vedge, state->w*state->h*sizeof(unsigned char));
memcpy(ret->hedge, state->hedge, state->w*state->h*sizeof(unsigned char));
return ret;
}
static void free_game(game_state *state)
{
sfree(state->grid);
sfree(state->vedge);
sfree(state->hedge);
sfree(state);
}
static unsigned char *get_correct(game_state *state)
{
unsigned char *ret;
int x, y;
ret = snewn(state->w * state->h, unsigned char);
memset(ret, 0xFF, state->w * state->h);
for (x = 0; x < state->w; x++)
for (y = 0; y < state->h; y++)
if (index(state,ret,x,y) == 0xFF) {
int rw, rh;
int xx, yy;
int num, area, valid;
/*
* Find a rectangle starting at this point.
*/
rw = 1;
while (x+rw < state->w && !vedge(state,x+rw,y))
rw++;
rh = 1;
while (y+rh < state->h && !hedge(state,x,y+rh))
rh++;
/*
* We know what the dimensions of the rectangle
* should be if it's there at all. Find out if we
* really have a valid rectangle.
*/
valid = TRUE;
/* Check the horizontal edges. */
for (xx = x; xx < x+rw; xx++) {
for (yy = y; yy <= y+rh; yy++) {
int e = !HRANGE(state,xx,yy) || hedge(state,xx,yy);
int ec = (yy == y || yy == y+rh);
if (e != ec)
valid = FALSE;
}
}
/* Check the vertical edges. */
for (yy = y; yy < y+rh; yy++) {
for (xx = x; xx <= x+rw; xx++) {
int e = !VRANGE(state,xx,yy) || vedge(state,xx,yy);
int ec = (xx == x || xx == x+rw);
if (e != ec)
valid = FALSE;
}
}
/*
* If this is not a valid rectangle with no other
* edges inside it, we just mark this square as not
* complete and proceed to the next square.
*/
if (!valid) {
index(state, ret, x, y) = 0;
continue;
}
/*
* We have a rectangle. Now see what its area is,
* and how many numbers are in it.
*/
num = 0;
area = 0;
for (xx = x; xx < x+rw; xx++) {
for (yy = y; yy < y+rh; yy++) {
area++;
if (grid(state,xx,yy)) {
if (num > 0)
valid = FALSE; /* two numbers */
num = grid(state,xx,yy);
}
}
}
if (num != area)
valid = FALSE;
/*
* Now fill in the whole rectangle based on the
* value of `valid'.
*/
for (xx = x; xx < x+rw; xx++) {
for (yy = y; yy < y+rh; yy++) {
index(state, ret, xx, yy) = valid;
}
}
}
return ret;
}
struct game_ui {
/*
* These coordinates are 2 times the obvious grid coordinates.
* Hence, the top left of the grid is (0,0), the grid point to
* the right of that is (2,0), the one _below that_ is (2,2)
* and so on. This is so that we can specify a drag start point
* on an edge (one odd coordinate) or in the middle of a square
* (two odd coordinates) rather than always at a corner.
*
* -1,-1 means no drag is in progress.
*/
int drag_start_x;
int drag_start_y;
int drag_end_x;
int drag_end_y;
/*
* This flag is set as soon as a dragging action moves the
* mouse pointer away from its starting point, so that even if
* the pointer _returns_ to its starting point the action is
* treated as a small drag rather than a click.
*/
int dragged;
};
static game_ui *new_ui(game_state *state)
{
game_ui *ui = snew(game_ui);
ui->drag_start_x = -1;
ui->drag_start_y = -1;
ui->drag_end_x = -1;
ui->drag_end_y = -1;
ui->dragged = FALSE;
return ui;
}
static void free_ui(game_ui *ui)
{
sfree(ui);
}
static void coord_round(float x, float y, int *xr, int *yr)
{
float xs, ys, xv, yv, dx, dy, dist;
/*
* Find the nearest square-centre.
*/
xs = (float)floor(x) + 0.5F;
ys = (float)floor(y) + 0.5F;
/*
* And find the nearest grid vertex.
*/
xv = (float)floor(x + 0.5F);
yv = (float)floor(y + 0.5F);
/*
* We allocate clicks in parts of the grid square to either
* corners, edges or square centres, as follows:
*
* +--+--------+--+
* | | | |
* +--+ +--+
* | `. ,' |
* | +--+ |
* | | | |
* | +--+ |
* | ,' `. |
* +--+ +--+
* | | | |
* +--+--------+--+
*
* (Not to scale!)
*
* In other words: we measure the square distance (i.e.
* max(dx,dy)) from the click to the nearest corner, and if
* it's within CORNER_TOLERANCE then we return a corner click.
* We measure the square distance from the click to the nearest
* centre, and if that's within CENTRE_TOLERANCE we return a
* centre click. Failing that, we find which of the two edge
* centres is nearer to the click and return that edge.
*/
/*
* Check for corner click.
*/
dx = (float)fabs(x - xv);
dy = (float)fabs(y - yv);
dist = (dx > dy ? dx : dy);
if (dist < CORNER_TOLERANCE) {
*xr = 2 * (int)xv;
*yr = 2 * (int)yv;
} else {
/*
* Check for centre click.
*/
dx = (float)fabs(x - xs);
dy = (float)fabs(y - ys);
dist = (dx > dy ? dx : dy);
if (dist < CENTRE_TOLERANCE) {
*xr = 1 + 2 * (int)xs;
*yr = 1 + 2 * (int)ys;
} else {
/*
* Failing both of those, see which edge we're closer to.
* Conveniently, this is simply done by testing the relative
* magnitude of dx and dy (which are currently distances from
* the square centre).
*/
if (dx > dy) {
/* Vertical edge: x-coord of corner,
* y-coord of square centre. */
*xr = 2 * (int)xv;
*yr = 1 + 2 * (int)ys;
} else {
/* Horizontal edge: x-coord of square centre,
* y-coord of corner. */
*xr = 1 + 2 * (int)xs;
*yr = 2 * (int)yv;
}
}
}
}
static void ui_draw_rect(game_state *state, game_ui *ui,
unsigned char *hedge, unsigned char *vedge, int c)
{
int x1, x2, y1, y2, x, y, t;
x1 = ui->drag_start_x;
x2 = ui->drag_end_x;
if (x2 < x1) { t = x1; x1 = x2; x2 = t; }
y1 = ui->drag_start_y;
y2 = ui->drag_end_y;
if (y2 < y1) { t = y1; y1 = y2; y2 = t; }
x1 = x1 / 2; /* rounds down */
x2 = (x2+1) / 2; /* rounds up */
y1 = y1 / 2; /* rounds down */
y2 = (y2+1) / 2; /* rounds up */
/*
* Draw horizontal edges of rectangles.
*/
for (x = x1; x < x2; x++)
for (y = y1; y <= y2; y++)
if (HRANGE(state,x,y)) {
int val = index(state,hedge,x,y);
if (y == y1 || y == y2)
val = c;
else if (c == 1)
val = 0;
index(state,hedge,x,y) = val;
}
/*
* Draw vertical edges of rectangles.
*/
for (y = y1; y < y2; y++)
for (x = x1; x <= x2; x++)
if (VRANGE(state,x,y)) {
int val = index(state,vedge,x,y);
if (x == x1 || x == x2)
val = c;
else if (c == 1)
val = 0;
index(state,vedge,x,y) = val;
}
}
static game_state *make_move(game_state *from, game_ui *ui,
int x, int y, int button)
{
int xc, yc;
int startdrag = FALSE, enddrag = FALSE, active = FALSE;
game_state *ret;
if (button == LEFT_BUTTON) {
startdrag = TRUE;
} else if (button == LEFT_RELEASE) {
enddrag = TRUE;
} else if (button != LEFT_DRAG) {
return NULL;
}
coord_round(FROMCOORD((float)x), FROMCOORD((float)y), &xc, &yc);
if (startdrag) {
ui->drag_start_x = xc;
ui->drag_start_y = yc;
ui->drag_end_x = xc;
ui->drag_end_y = yc;
ui->dragged = FALSE;
active = TRUE;
}
if (xc != ui->drag_end_x || yc != ui->drag_end_y) {
ui->drag_end_x = xc;
ui->drag_end_y = yc;
ui->dragged = TRUE;
active = TRUE;
}
ret = NULL;
if (enddrag) {
if (xc >= 0 && xc <= 2*from->w &&
yc >= 0 && yc <= 2*from->h) {
ret = dup_game(from);
if (ui->dragged) {
ui_draw_rect(ret, ui, ret->hedge, ret->vedge, 1);
} else {
if ((xc & 1) && !(yc & 1) && HRANGE(from,xc/2,yc/2)) {
hedge(ret,xc/2,yc/2) = !hedge(ret,xc/2,yc/2);
}
if ((yc & 1) && !(xc & 1) && VRANGE(from,xc/2,yc/2)) {
vedge(ret,xc/2,yc/2) = !vedge(ret,xc/2,yc/2);
}
}
if (!memcmp(ret->hedge, from->hedge, from->w*from->h) &&
!memcmp(ret->vedge, from->vedge, from->w*from->h)) {
free_game(ret);
ret = NULL;
}
/*
* We've made a real change to the grid. Check to see
* if the game has been completed.
*/
if (ret && !ret->completed) {
int x, y, ok;
unsigned char *correct = get_correct(ret);
ok = TRUE;
for (x = 0; x < ret->w; x++)
for (y = 0; y < ret->h; y++)
if (!index(ret, correct, x, y))
ok = FALSE;
sfree(correct);
if (ok)
ret->completed = TRUE;
}
}
ui->drag_start_x = -1;
ui->drag_start_y = -1;
ui->drag_end_x = -1;
ui->drag_end_y = -1;
ui->dragged = FALSE;
active = TRUE;
}
if (ret)
return ret; /* a move has been made */
else if (active)
return from; /* UI activity has occurred */
else
return NULL;
}
/* ----------------------------------------------------------------------
* Drawing routines.
*/
#define CORRECT 65536
#define COLOUR(k) ( (k)==1 ? COL_LINE : COL_DRAG )
#define MAX(x,y) ( (x)>(y) ? (x) : (y) )
#define MAX4(x,y,z,w) ( MAX(MAX(x,y),MAX(z,w)) )
struct game_drawstate {
int started;
int w, h;
unsigned int *visible;
};
static void game_size(game_params *params, int *x, int *y)
{
*x = params->w * TILE_SIZE + 2*BORDER + 1;
*y = params->h * TILE_SIZE + 2*BORDER + 1;
}
static float *game_colours(frontend *fe, game_state *state, int *ncolours)
{
float *ret = snewn(3 * NCOLOURS, float);
frontend_default_colour(fe, &ret[COL_BACKGROUND * 3]);
ret[COL_GRID * 3 + 0] = 0.5F * ret[COL_BACKGROUND * 3 + 0];
ret[COL_GRID * 3 + 1] = 0.5F * ret[COL_BACKGROUND * 3 + 1];
ret[COL_GRID * 3 + 2] = 0.5F * ret[COL_BACKGROUND * 3 + 2];
ret[COL_DRAG * 3 + 0] = 1.0F;
ret[COL_DRAG * 3 + 1] = 0.0F;
ret[COL_DRAG * 3 + 2] = 0.0F;
ret[COL_CORRECT * 3 + 0] = 0.75F * ret[COL_BACKGROUND * 3 + 0];
ret[COL_CORRECT * 3 + 1] = 0.75F * ret[COL_BACKGROUND * 3 + 1];
ret[COL_CORRECT * 3 + 2] = 0.75F * ret[COL_BACKGROUND * 3 + 2];
ret[COL_LINE * 3 + 0] = 0.0F;
ret[COL_LINE * 3 + 1] = 0.0F;
ret[COL_LINE * 3 + 2] = 0.0F;
ret[COL_TEXT * 3 + 0] = 0.0F;
ret[COL_TEXT * 3 + 1] = 0.0F;
ret[COL_TEXT * 3 + 2] = 0.0F;
*ncolours = NCOLOURS;
return ret;
}
static game_drawstate *game_new_drawstate(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 int);
for (i = 0; i < ds->w * ds->h; i++)
ds->visible[i] = 0xFFFF;
return ds;
}
static void game_free_drawstate(game_drawstate *ds)
{
sfree(ds->visible);
sfree(ds);
}
static void draw_tile(frontend *fe, game_state *state, int x, int y,
unsigned char *hedge, unsigned char *vedge,
unsigned char *corners, int correct)
{
int cx = COORD(x), cy = COORD(y);
char str[80];
draw_rect(fe, cx, cy, TILE_SIZE+1, TILE_SIZE+1, COL_GRID);
draw_rect(fe, cx+1, cy+1, TILE_SIZE-1, TILE_SIZE-1,
correct ? COL_CORRECT : COL_BACKGROUND);
if (grid(state,x,y)) {
sprintf(str, "%d", grid(state,x,y));
draw_text(fe, cx+TILE_SIZE/2, cy+TILE_SIZE/2, FONT_VARIABLE,
TILE_SIZE/2, ALIGN_HCENTRE | ALIGN_VCENTRE, COL_TEXT, str);
}
/*
* Draw edges.
*/
if (!HRANGE(state,x,y) || index(state,hedge,x,y))
draw_rect(fe, cx, cy, TILE_SIZE+1, 2,
HRANGE(state,x,y) ? COLOUR(index(state,hedge,x,y)) :
COL_LINE);
if (!HRANGE(state,x,y+1) || index(state,hedge,x,y+1))
draw_rect(fe, cx, cy+TILE_SIZE-1, TILE_SIZE+1, 2,
HRANGE(state,x,y+1) ? COLOUR(index(state,hedge,x,y+1)) :
COL_LINE);
if (!VRANGE(state,x,y) || index(state,vedge,x,y))
draw_rect(fe, cx, cy, 2, TILE_SIZE+1,
VRANGE(state,x,y) ? COLOUR(index(state,vedge,x,y)) :
COL_LINE);
if (!VRANGE(state,x+1,y) || index(state,vedge,x+1,y))
draw_rect(fe, cx+TILE_SIZE-1, cy, 2, TILE_SIZE+1,
VRANGE(state,x+1,y) ? COLOUR(index(state,vedge,x+1,y)) :
COL_LINE);
/*
* Draw corners.
*/
if (index(state,corners,x,y))
draw_rect(fe, cx, cy, 2, 2,
COLOUR(index(state,corners,x,y)));
if (x+1 < state->w && index(state,corners,x+1,y))
draw_rect(fe, cx+TILE_SIZE-1, cy, 2, 2,
COLOUR(index(state,corners,x+1,y)));
if (y+1 < state->h && index(state,corners,x,y+1))
draw_rect(fe, cx, cy+TILE_SIZE-1, 2, 2,
COLOUR(index(state,corners,x,y+1)));
if (x+1 < state->w && y+1 < state->h && index(state,corners,x+1,y+1))
draw_rect(fe, cx+TILE_SIZE-1, cy+TILE_SIZE-1, 2, 2,
COLOUR(index(state,corners,x+1,y+1)));
draw_update(fe, cx, cy, TILE_SIZE+1, TILE_SIZE+1);
}
static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate,
game_state *state, int dir, game_ui *ui,
float animtime, float flashtime)
{
int x, y;
unsigned char *correct;
unsigned char *hedge, *vedge, *corners;
correct = get_correct(state);
if (ui->dragged) {
hedge = snewn(state->w*state->h, unsigned char);
vedge = snewn(state->w*state->h, unsigned char);
memcpy(hedge, state->hedge, state->w*state->h);
memcpy(vedge, state->vedge, state->w*state->h);
ui_draw_rect(state, ui, hedge, vedge, 2);
} else {
hedge = state->hedge;
vedge = state->vedge;
}
corners = snewn(state->w * state->h, unsigned char);
memset(corners, 0, state->w * state->h);
for (x = 0; x < state->w; x++)
for (y = 0; y < state->h; y++) {
if (x > 0) {
int e = index(state, vedge, x, y);
if (index(state,corners,x,y) < e)
index(state,corners,x,y) = e;
if (y+1 < state->h &&
index(state,corners,x,y+1) < e)
index(state,corners,x,y+1) = e;
}
if (y > 0) {
int e = index(state, hedge, x, y);
if (index(state,corners,x,y) < e)
index(state,corners,x,y) = e;
if (x+1 < state->w &&
index(state,corners,x+1,y) < e)
index(state,corners,x+1,y) = e;
}
}
if (!ds->started) {
draw_rect(fe, 0, 0,
state->w * TILE_SIZE + 2*BORDER + 1,
state->h * TILE_SIZE + 2*BORDER + 1, COL_BACKGROUND);
draw_rect(fe, COORD(0)-1, COORD(0)-1,
ds->w*TILE_SIZE+3, ds->h*TILE_SIZE+3, COL_LINE);
ds->started = TRUE;
draw_update(fe, 0, 0,
state->w * TILE_SIZE + 2*BORDER + 1,
state->h * TILE_SIZE + 2*BORDER + 1);
}
for (x = 0; x < state->w; x++)
for (y = 0; y < state->h; y++) {
unsigned int c = 0;
if (HRANGE(state,x,y))
c |= index(state,hedge,x,y);
if (HRANGE(state,x,y+1))
c |= index(state,hedge,x,y+1) << 2;
if (VRANGE(state,x,y))
c |= index(state,vedge,x,y) << 4;
if (VRANGE(state,x+1,y))
c |= index(state,vedge,x+1,y) << 6;
c |= index(state,corners,x,y) << 8;
if (x+1 < state->w)
c |= index(state,corners,x+1,y) << 10;
if (y+1 < state->h)
c |= index(state,corners,x,y+1) << 12;
if (x+1 < state->w && y+1 < state->h)
c |= index(state,corners,x+1,y+1) << 14;
if (index(state, correct, x, y) && !flashtime)
c |= CORRECT;
if (index(ds,ds->visible,x,y) != c) {
draw_tile(fe, state, x, y, hedge, vedge, corners, c & CORRECT);
index(ds,ds->visible,x,y) = c;
}
}
if (hedge != state->hedge) {
sfree(hedge);
sfree(vedge);
}
sfree(corners);
sfree(correct);
}
static float game_anim_length(game_state *oldstate,
game_state *newstate, int dir)
{
return 0.0F;
}
static float game_flash_length(game_state *oldstate,
game_state *newstate, int dir)
{
if (!oldstate->completed && newstate->completed)
return FLASH_TIME;
return 0.0F;
}
static int game_wants_statusbar(void)
{
return FALSE;
}
#ifdef COMBINED
#define thegame rect
#endif
const struct game thegame = {
"Rectangles", "games.rectangles", TRUE,
default_params,
game_fetch_preset,
decode_params,
encode_params,
free_params,
dup_params,
game_configure,
custom_params,
validate_params,
new_game_seed,
validate_seed,
new_game,
dup_game,
free_game,
new_ui,
free_ui,
make_move,
game_size,
game_colours,
game_new_drawstate,
game_free_drawstate,
game_redraw,
game_anim_length,
game_flash_length,
game_wants_statusbar,
};
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