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Stop the Pattern grid generation from generating an entire row or

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column of the same colour (at least when the dimensions are big
enough to make this feasible). It's a little bit too easy otherwise!

[originally from svn r5391]
This commit is contained in:
Simon Tatham
2005-02-24 09:13:06 +00:00
parent e500ef9637
commit f64dcb909d
1 changed files with 28 additions and 0 deletions
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28
pattern.c
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@ -417,6 +417,34 @@ static unsigned char *generate_soluble(random_state *rs, int w, int h)
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 {