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internal/stroke: fix point normalization for unit length.

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This fixes the cases where the unit length matches the hypotenuse.

Signed-off-by: Walter Werner SCHNEIDER <contact@schnwalter.eu>
This commit is contained in:
Walter Werner SCHNEIDER
2025-07-28 22:08:34 +03:00
committed by Elias Naur
parent 176570527d
commit 30f8ac10b7
2 changed files with 15 additions and 1 deletions
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internal/stroke/stroke.go
+5 -1
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@@ -342,7 +342,11 @@ func normPt(p f32.Point, l float32) f32.Point {
d := math.Hypot(float64(p.X), float64(p.Y))
l64 := float64(l)
if math.Abs(d-l64) < 1e-10 {
return f32.Point{}
if math.Signbit(float64(l)) {
return f32.Point{X: -p.X, Y: -p.Y}
} else {
return f32.Point{X: p.X, Y: p.Y}
}
}
n := float32(l64 / d)
return f32.Point{X: p.X * n, Y: p.Y * n}