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internal/stroke: don't draw round join if angle is NaN

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References: https://todo.sr.ht/~eliasnaur/gio/331
Signed-off-by: Andy Balholm <andy@balholm.com>
This commit is contained in:
Andy Balholm
2022-02-04 15:22:05 -08:00
committed by Elias Naur
parent 58cdb3e1da
commit 44c9fb7448
3 changed files with 32 additions and 2 deletions
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internal/stroke/stroke.go
+6 -2
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@@ -510,14 +510,18 @@ func strokePathRoundJoin(rhs, lhs *StrokeQuads, hw float32, pivot, n0, n1 f32.Po
// Path bends to the right, ie. CW (or 180 degree turn).
c := pivot.Sub(lhs.pen())
angle := -math.Acos(float64(cosPt(n0, n1)))
lhs.arc(c, c, float32(angle))
if !math.IsNaN(angle) {
lhs.arc(c, c, float32(angle))
}
lhs.lineTo(lp) // Add a line to accommodate for rounding errors.
rhs.lineTo(rp)
default:
// Path bends to the left, ie. CCW.
angle := math.Acos(float64(cosPt(n0, n1)))
c := pivot.Sub(rhs.pen())
rhs.arc(c, c, float32(angle))
if !math.IsNaN(angle) {
rhs.arc(c, c, float32(angle))
}
rhs.lineTo(rp) // Add a line to accommodate for rounding errors.
lhs.lineTo(lp)
}