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Merge pull request #25 from guzba/master

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simpler
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treeform 2020-12-04 21:11:04 -08:00 committed by GitHub
commit c6eb92d923
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1 changed files with 8 additions and 13 deletions
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21
src/pixie/common.nim
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@ -8,7 +8,7 @@ type
at*: Vec2 at*: Vec2
to*: Vec2 to*: Vec2
proc segment*(at, to: Vec2): Segment = proc segment*(at, to: Vec2): Segment {.inline.} =
result.at = at result.at = at
result.to = to result.to = to
@ -16,23 +16,18 @@ proc intersects*(a, b: Segment, at: var Vec2): bool {.inline.} =
## Checks if the a segment intersects b segment. ## Checks if the a segment intersects b segment.
## If it returns true, at will have point of intersection ## If it returns true, at will have point of intersection
let let
s1x = a.to.x - a.at.x s1 = a.to - a.at
s1y = a.to.y - a.at.y s2 = b.to - b.at
s2x = b.to.x - b.at.x denominator = (-s2.x * s1.y + s1.x * s2.y)
s2y = b.to.y - b.at.y s = (-s1.y * (a.at.x - b.at.x) + s1.x * (a.at.y - b.at.y)) / denominator
t = (s2.x * (a.at.y - b.at.y) - s2.y * (a.at.x - b.at.x)) / denominator
let
denominator = (-s2x * s1y + s1x * s2y)
s = (-s1y * (a.at.x - b.at.x) + s1x * (a.at.y - b.at.y)) / denominator
t = (s2x * (a.at.y - b.at.y) - s2y * (a.at.x - b.at.x)) / denominator
if s >= 0 and s < 1 and t >= 0 and t < 1: if s >= 0 and s < 1 and t >= 0 and t < 1:
at.x = a.at.x + (t * s1x) at = a.at + (t * s1)
at.y = a.at.y + (t * s1y)
return true return true
return false return false
proc fractional*(v: float32): float32 = proc fractional*(v: float32): float32 {.inline.} =
## Returns unsigned fraction part of the float. ## Returns unsigned fraction part of the float.
## -13.7868723 -> 0.7868723 ## -13.7868723 -> 0.7868723
result = abs(v) result = abs(v)