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Refactor shader creation

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This commit is contained in:
jgk
2021-03-21 17:10:10 +01:00
parent 1ecbe2375d
commit 279f928375
4 changed files with 52 additions and 50 deletions
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src/Geometry/Intersect.hs
+15
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@@ -44,6 +44,21 @@ intersectSegLineFrom' (x1,y1) (x2,y2) (x3,y3) (x4,y4)
t' = (x1-x3)*(y3-y4) - (y1-y3)*(x3-x4)
u' = (y1-y2)*(x1-x3) - (x1-x2)*(y1-y3)
-- this is probably not correct...
intersectSegLineext :: Point2 -> Point2 -> Point2 -> Point2 -> Maybe Point2
{-# INLINE intersectSegLineext #-}
intersectSegLineext (x1,y1) (x2,y2) (x3,y3) (x4,y4)
| den == 0 = Nothing
| den > 0 && ( t' < 0 || u' < den || t' > den )
= Nothing
| den < 0 && ( t' > 0 || u' > - den || t' < den )
= Nothing
| otherwise = Just (x1 + (x2-x1)*t'/den, y1 + (y2-y1)*t'/den)
where
den = (x1-x2)*(y3-y4) - (y1-y2)*(x3-x4)
t' = (x1-x3)*(y3-y4) - (y1-y3)*(x3-x4)
u' = (y1-y2)*(x1-x3) - (x1-x2)*(y1-y3)
intersectSegLine' :: Point2 -> Point2 -> Point2 -> Point2 -> Maybe Point2
{-# INLINE intersectSegLine' #-}
intersectSegLine' (x1,y1) (x2,y2) (x3,y3) (x4,y4)