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ebitenutil: Give up using linear filter for lines

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The edges of a source texture would be unexpectable with linear filterling
This commit is contained in:
Hajime Hoshi 2017-12-03 23:39:09 +09:00
parent 95906e9630
commit 6bbf6c53ce
1 changed files with 9 additions and 10 deletions
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19
ebitenutil/shapes.go
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@ -22,15 +22,14 @@ import (
)
var (
emptyNearestImage *ebiten.Image
emptyLinearImage *ebiten.Image
emptyImage *ebiten.Image
)
func init() {
emptyNearestImage, _ = ebiten.NewImage(16, 16, ebiten.FilterNearest)
_ = emptyNearestImage.Fill(color.White)
emptyLinearImage, _ = ebiten.NewImage(16, 16, ebiten.FilterLinear)
_ = emptyLinearImage.Fill(color.White)
// Filter must be 'nearest' filter.
// Linear filtering would make edges blurred.
emptyImage, _ = ebiten.NewImage(16, 16, ebiten.FilterNearest)
_ = emptyImage.Fill(color.White)
}
func colorScale(clr color.Color) (rf, gf, bf, af float64) {
@ -50,7 +49,7 @@ func colorScale(clr color.Color) (rf, gf, bf, af float64) {
//
// DrawLine is intended to be used mainly for debugging or prototyping purpose.
func DrawLine(dst *ebiten.Image, x1, y1, x2, y2 float64, clr color.Color) {
ew, eh := emptyLinearImage.Size()
ew, eh := emptyImage.Size()
length := math.Hypot(x2-x1, y2-y1)
op := &ebiten.DrawImageOptions{}
@ -58,18 +57,18 @@ func DrawLine(dst *ebiten.Image, x1, y1, x2, y2 float64, clr color.Color) {
op.GeoM.Rotate(math.Atan2(y2-y1, x2-x1))
op.GeoM.Translate(x1, y1)
op.ColorM.Scale(colorScale(clr))
_ = dst.DrawImage(emptyLinearImage, op)
_ = dst.DrawImage(emptyImage, op)
}
// DrawRect draws a rectangle on the given destination dst.
//
// DrawRect is intended to be used mainly for debugging or prototyping purpose.
func DrawRect(dst *ebiten.Image, x, y, width, height float64, clr color.Color) {
ew, eh := emptyNearestImage.Size()
ew, eh := emptyImage.Size()
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(width/float64(ew), height/float64(eh))
op.GeoM.Translate(x, y)
op.ColorM.Scale(colorScale(clr))
_ = dst.DrawImage(emptyNearestImage, op)
_ = dst.DrawImage(emptyImage, op)
}