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int transformation[(2*19 - 1) * (2*19 - 1)][8];
const int transformation2[8][2][2] = {
{{1, 0}, {0, 1}},
{{0, 1}, {-1, 0}},
{{-1, 0}, {0, -1}},
{{0, -1}, {1, 0}},
{{0, -1}, {-1, 0}},
{{-1, 0}, {0, 1}},
{{0, 1}, {1, 0}},
{{1, 0}, {0, -1}}
};
void
transformation_init (void)
{
int k;
int dx;
int dy;
for (k = 0; k < 8; k++)
{
for (dy = -19 + 1; dy <= 19 - 1; dy++)
{
for (dx = -19 + 1; dx <= 19 - 1; dx++)
{
int tx;
int ty;
do
{
*&tx =
transformation2[k][0][0] * (dx) +
transformation2[k][0][1] * (dy);
*&ty =
transformation2[k][1][0] * (dx) +
transformation2[k][1][1] * (dy);
}
while (0);
transformation[((dy + 19 - 1) * (2 * 19 - 1) +
(dx + 19 - 1))][k] = ((tx) * (19 + 1) + (ty));
}
}
}
}
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