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internal/stroke: fix normal vector size

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With this change the GPU renderer now properly handles the cases when the stroke width equals the stroke length where the normal vector is the same size as the original vector.

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
2024-05-06 00:47:39 +03:00
committed by Elias Naur
parent 691adf4e77
commit 8242234274
1 changed files with 3 additions and 0 deletions
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internal/stroke/stroke.go
+3
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@@ -327,6 +327,9 @@ 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}
}
d := math.Hypot(float64(p.X), float64(p.Y))
l64 := float64(l)
if math.Abs(d-l64) < 1e-10 {