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internal/stroke: fix normal vector size and direction

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The normal vector size and direction depend on the input point and the sign of the unit value provided.

Fixes: https://todo.sr.ht/~eliasnaur/gio/576
Signed-off-by: Walter Werner SCHNEIDER <contact@schnwalter.eu>
This commit is contained in:
Walter Werner SCHNEIDER
2025-06-25 23:47:15 +03:00
committed by Elias Naur
parent c3ce484b5e
commit 6ce7ffa4ca
2 changed files with 99 additions and 2 deletions
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internal/stroke/stroke.go
+8 -2
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@@ -327,8 +327,14 @@ func strokePathNorm(p0, p1, p2 f32.Point, t, d float32) f32.Point {
func rot90CW(p f32.Point) f32.Point { return f32.Pt(+p.Y, -p.X) }
func normPt(p f32.Point, l float32) f32.Point {
if (p.X == 0 && p.Y == l) || (p.Y == 0 && p.X == l) {
return f32.Point{X: p.X, Y: p.Y}
isVerticalUnit := p.X == 0 && (p.Y == l || p.Y == -l)
isHorizontalUnit := p.Y == 0 && (p.X == l || p.X == -l)
if isVerticalUnit || isHorizontalUnit {
if math.Signbit(float64(l)) {
return f32.Point{X: -p.X, Y: -p.Y}
} else {
return f32.Point{X: p.X, Y: p.Y}
}
}
d := math.Hypot(float64(p.X), float64(p.Y))
l64 := float64(l)