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ALGO: rm non-triangles and duplicates

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hasufell 2015-01-13 01:05:02 +01:00
parent 534284bbe0
commit eb1142b52f
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1 changed files with 5 additions and 5 deletions
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10
Algorithms/PolygonTriangulation.hs
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@ -119,7 +119,7 @@ monotonePartitioning pts
| otherwise = a : go xs b | otherwise = a : go xs b
where where
[a, b] = splitPoly pts' x [a, b] = splitPoly pts' x
go _ _ = [[]] go _ _ = []
-- |Try to eliminate the merge and split vertices by computing the -- |Try to eliminate the merge and split vertices by computing the
@ -159,7 +159,7 @@ triangulate pts =
go xs (p@(u:vi:vi1:ys), rs) go xs (p@(u:vi:vi1:ys), rs)
-- case 1 and 3 -- case 1 and 3
| adjacent u (last p) xs = | adjacent u (last p) xs =
splitPoly xs (u, (last . init) p) (triangleOnly . splitPoly xs $ (u, (last . init) p))
++ go (fromMaybe [] ++ go (fromMaybe []
. headMay . headMay
. nonTriangleOnly . nonTriangleOnly
@ -169,7 +169,7 @@ triangulate pts =
-- case 2 -- case 2
| adjacent u vi xs && (not . null) rs = | adjacent u vi xs && (not . null) rs =
if getAngle (vp2 vi u) (vp2 vi vi1) < pi / 2 if getAngle (vp2 vi u) (vp2 vi vi1) < pi / 2
then splitPoly xs (u, vi1) then (triangleOnly . splitPoly xs $ (u, vi1))
++ go (fromMaybe [] ++ go (fromMaybe []
. headMay . headMay
. nonTriangleOnly . nonTriangleOnly
@ -177,5 +177,5 @@ triangulate pts =
$ (u, vi1)) $ (u, vi1))
(u:vi1:ys, rs) (u:vi1:ys, rs)
else go xs (head rs:p, tail rs) else go xs (head rs:p, tail rs)
| otherwise = [[]] | otherwise = []
go _ _ = [[]] go _ _ = []