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< title > Ebiten example - filter< / title >
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< h2 > Ebiten example - filter< / h2 >
< iframe src = "filter.content.html" width = "640" height = "480" > < / iframe >
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< div class = "card" > < pre class = "card-body" > < code class = "language-go" > // + build example jsgo
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package main
import (
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" bytes"
" image"
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_ " image/png"
" log"
" github.com/hajimehoshi/ebiten"
" github.com/hajimehoshi/ebiten/ebitenutil"
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" github.com/hajimehoshi/ebiten/examples/resources/images"
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)
const (
screenWidth = 640
screenHeight = 480
)
var (
ebitenImage *ebiten.Image
)
func update(screen *ebiten.Image) error {
if ebiten.IsRunningSlowly() {
return nil
}
ebitenutil.DebugPrint(screen, " Nearest Filter (default) VS Linear Filter" )
op := & ebiten.DrawImageOptions{}
op.GeoM.Scale(4, 4)
op.GeoM.Translate(64, 64)
// By default, nearest filter is used.
screen.DrawImage(ebitenImage, op)
op = & ebiten.DrawImageOptions{}
op.GeoM.Scale(4, 4)
op.GeoM.Translate(64, 64+ 240)
// Specify linear filter.
op.Filter = ebiten.FilterLinear
screen.DrawImage(ebitenImage, op)
return nil
}
func main() {
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// Decode image from a byte slice instead of a file so that
// this example works in any working directory.
// If you want to use a file, there are some options:
// 1) Use os.Open and pass the file to the image decoder.
// This is a very regular way, but doesn' t work on browsers.
// 2) Use ebitenutil.OpenFile and pass the file to the image decoder.
// This works even on browsers.
// 3) Use ebitenutil.NewImageFromFile to create an ebiten.Image directly from a file.
// This also works on browsers.
img, _, err := image.Decode(bytes.NewReader(images.Ebiten_png))
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if err != nil {
log.Fatal(err)
}
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// Specifying filter on NewImage[FromImage] is just for backward compatibility.
// Now specifying filter at DrawImageOptions is recommended.
// Specify FilterDefault here, that means to prefer filter specified at DrawImageOptions.
ebitenImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
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if err := ebiten.Run(update, screenWidth, screenHeight, 1, " Filter (Ebiten Demo)" ); err != nil {
log.Fatal(err)
}
}
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