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Fix photon reflection.

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In cases such as photons travelling horizontally left towards a line
with a shallow slope downwards from left to right.

Direction map now includes directions parallel to photon
velocity in these cases.
This commit is contained in:
jacksonmj
2011-01-09 10:02:26 +00:00
parent 7f83cb1061
commit 56a3ad373c
1 changed files with 8 additions and 8 deletions
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16
src/powder.c
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@@ -260,14 +260,14 @@ int try_move(int i, int x, int y, int nx, int ny)
static unsigned direction_to_map(float dx, float dy)
{
return (dx >= 0) |
(((dx + dy) >= 0) << 1) | /* 567 */
((dy >= 0) << 2) | /* 4+0 */
(((dy - dx) >= 0) << 3) | /* 321 */
((dx <= 0) << 4) |
(((dx + dy) <= 0) << 5) |
((dy <= 0) << 6) |
(((dy - dx) <= 0) << 7);
return (dx >= -0.1) |
(((dx + dy) >= -0.1) << 1) | /* 567 */
((dy >= -0.1) << 2) | /* 4+0 */
(((dy - dx) >= -0.1) << 3) | /* 321 */
((dx <= 0.1) << 4) |
(((dx + dy) <= 0.1) << 5) |
((dy <= 0.1) << 6) |
(((dy - dx) <= 0.1) << 7);
}
static int is_blocking(int t, int x, int y)