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ebitenutil: add comments and use ColorScale

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Updates #2605
This commit is contained in:
Hajime Hoshi 2023-03-18 10:42:24 +09:00
parent bf63d2310d
commit f66ed646bd
1 changed files with 8 additions and 2 deletions
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10
ebitenutil/shapes.go
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@ -42,13 +42,15 @@ func init() {
//
// Use vector.StrokeLine instead if you require rendering with higher quality.
func DrawLine(dst *ebiten.Image, x1, y1, x2, y2 float64, clr color.Color) {
// Use ebiten.Image's DrawImage instead of vector.StrokeLine for backward compatibility (#2605)
length := math.Hypot(x2-x1, y2-y1)
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(length, 1)
op.GeoM.Rotate(math.Atan2(y2-y1, x2-x1))
op.GeoM.Translate(x1, y1)
op.ColorM.ScaleWithColor(clr)
op.ColorScale.ScaleWithColor(clr)
// Filter must be 'nearest' filter (default).
// Linear filtering would make edges blurred.
dst.DrawImage(whiteSubImage, op)
@ -60,10 +62,12 @@ func DrawLine(dst *ebiten.Image, x1, y1, x2, y2 float64, clr color.Color) {
//
// Use vector.DrawFilledRect instead if you require rendering with higher quality.
func DrawRect(dst *ebiten.Image, x, y, width, height float64, clr color.Color) {
// Use ebiten.Image's DrawImage instead of vector.DrawFilledRect for backward compatibility (#2605)
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(width, height)
op.GeoM.Translate(x, y)
op.ColorM.ScaleWithColor(clr)
op.ColorScale.ScaleWithColor(clr)
// Filter must be 'nearest' filter (default).
// Linear filtering would make edges blurred.
dst.DrawImage(whiteImage.SubImage(image.Rect(1, 1, 2, 2)).(*ebiten.Image), op)
@ -75,6 +79,8 @@ func DrawRect(dst *ebiten.Image, x, y, width, height float64, clr color.Color) {
//
// Use vector.DrawFilledCircle instead if you require rendering with higher quality.
func DrawCircle(dst *ebiten.Image, cx, cy, r float64, clr color.Color) {
// Use ebiten.Image's DrawTriangles instead of vector.DrawFilledCircle for backward compatibility (#2605)
var path vector.Path
rd, g, b, a := clr.RGBA()