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Fix boundary detection for polygons

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This commit is contained in:
Sasha Koshka 2024-06-24 19:11:21 -04:00
parent 07865dc85f
commit 39a591e732
1 changed files with 4 additions and 4 deletions
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8
x/canvas/draw.go
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@ -159,12 +159,12 @@ func (this *pen) fillPolygon (c xgraphics.BGRA, points ...image.Point) {
area = this.image.Bounds().Intersect(area) area = this.image.Bounds().Intersect(area)
if area.Empty() { return } if area.Empty() { return }
boundaries := make([]int, len(points))
context := fillingContext { context := fillingContext {
image: this.image, image: this.image,
color: this.fill, color: this.fill,
min: area.Min.X, min: area.Min.X,
max: area.Max.X, max: area.Max.X,
boundaries: make([]int, len(points)),
points: points, points: points,
} }
@ -182,7 +182,7 @@ func (this *pen) fillPolygon (c xgraphics.BGRA, points ...image.Point) {
(fPointY < fy && fPrevY >= fy) || (fPointY < fy && fPrevY >= fy) ||
(fPrevY < fy && fPointY >= fy) (fPrevY < fy && fPointY >= fy)
if addboundary { if addboundary {
context.boundaries[boundaryCount] = int(math.Round ( boundaries[boundaryCount] = int(math.Round (
fPointX + fPointX +
(fy - fPointY) / (fy - fPointY) /
(fPrevY - fPointY) * (fPrevY - fPointY) *
@ -193,8 +193,8 @@ func (this *pen) fillPolygon (c xgraphics.BGRA, points ...image.Point) {
} }
// sort boundary list // sort boundary list
cutBoundaries := context.boundaries[:boundaryCount] context.boundaries = boundaries[:boundaryCount]
sort.Ints(cutBoundaries) sort.Ints(context.boundaries)
// fill pixels between boundary pairs // fill pixels between boundary pairs
if c.A == 255 { if c.A == 255 {