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dix: improve comment, directions flagged are 45° each

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The two directions returned by this calculation are always the two boundary
conditions. Since we don't do quadrants but octants, the flagged ones are
45° each. e.g. an angle of 35° flags E and NE.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Jamey Sharp <jamey@minilop.net>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
This commit is contained in:
Peter Hutterer 2011-04-20 11:47:21 +10:00
parent e804ae85fe
commit 7513190ec7
1 changed files with 1 additions and 1 deletions
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2
dix/ptrveloc.c
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@ -486,7 +486,7 @@ DoGetDirection(int dx, int dy){
/* find direction. We avoid r to become negative,
* since C has no well-defined modulo for such cases. */
r = (r+(M_PI*2.5))/(M_PI/4);
/* this intends to flag 2 directions (90 degrees),
/* this intends to flag 2 directions (45 degrees each),
* except on very well-aligned mickeys. */
i1 = (int)(r+0.1) % 8;
i2 = (int)(r+0.9) % 8;