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vector: allow NonZero for AppendVerticesAndIndicesForStroke

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Closes #2833
This commit is contained in:
Hajime Hoshi 2024-03-23 18:48:08 +09:00
parent b6252a41f2
commit 230619a036
2 changed files with 16 additions and 17 deletions
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16
examples/vector/main.go
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@ -140,12 +140,16 @@ func drawEbitenText(screen *ebiten.Image, x, y int, aa bool, line bool) {
op := &ebiten.DrawTrianglesOptions{}
op.AntiAlias = aa
if !line {
// ebiten.EvenOdd is also fine here.
// For strokes (AppendVerticesAndIndicesForStroke), FillAll and NonZero work.
//
// For filling (AppendVerticesAndIndicesForFilling), NonZero and EvenOdd work.
// NonZero and EvenOdd differ when rendering a complex polygons with self-intersections and/or holes.
// See https://en.wikipedia.org/wiki/Nonzero-rule and https://en.wikipedia.org/wiki/Even%E2%80%93odd_rule .
//
// For simplicity, this example always uses NonZero, whichever strokes or filling is done.
op.FillRule = ebiten.NonZero
}
screen.DrawTriangles(vs, is, whiteSubImage, op)
}
@ -199,9 +203,7 @@ func drawEbitenLogo(screen *ebiten.Image, x, y int, aa bool, line bool) {
op := &ebiten.DrawTrianglesOptions{}
op.AntiAlias = aa
if !line {
op.FillRule = ebiten.NonZero
}
screen.DrawTriangles(vs, is, whiteSubImage, op)
}
@ -243,9 +245,7 @@ func drawArc(screen *ebiten.Image, count int, aa bool, line bool) {
op := &ebiten.DrawTrianglesOptions{}
op.AntiAlias = aa
if !line {
op.FillRule = ebiten.NonZero
}
screen.DrawTriangles(vs, is, whiteSubImage, op)
}
@ -300,9 +300,7 @@ func drawWave(screen *ebiten.Image, counter int, aa bool, line bool) {
op := &ebiten.DrawTrianglesOptions{}
op.AntiAlias = aa
if !line {
op.FillRule = ebiten.NonZero
}
screen.DrawTriangles(vs, is, whiteSubImage, op)
}

5
vector/path.go
View File

@ -480,7 +480,7 @@ type StrokeOptions struct {
// The returned vertice's SrcX and SrcY are 0, and ColorR, ColorG, ColorB, and ColorA are 1.
//
// The returned values are intended to be passed to DrawTriangles or DrawTrianglesShader with a solid (non-transparent) color
// with the FillAll fill rule (not NonZero or EvenOdd fill rule).
// with FillAll or NonZero fill rule, not EvenOdd fill rule.
func (p *Path) AppendVerticesAndIndicesForStroke(vertices []ebiten.Vertex, indices []uint16, op *StrokeOptions) ([]ebiten.Vertex, []uint16) {
if op == nil {
return vertices, indices
@ -536,7 +536,8 @@ func (p *Path) AppendVerticesAndIndicesForStroke(vertices []ebiten.Vertex, indic
ColorA: 1,
})
}
indices = append(indices, idx, idx+1, idx+2, idx+1, idx+2, idx+3)
// All the triangles are rendered in clockwise order to enable NonZero filling rule (#2833).
indices = append(indices, idx, idx+1, idx+2, idx+1, idx+3, idx+2)
// Add line joints.
var nextRect [4]point