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< title > Ebiten example - flood< / title >
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< h2 > Ebiten example - flood< / h2 >
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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/color"
_ " image/png"
" log"
" github.com/hajimehoshi/ebiten"
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" github.com/hajimehoshi/ebiten/examples/resources/images"
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)
const (
screenWidth = 320
screenHeight = 240
)
var (
ebitenImage *ebiten.Image
colors = []color.RGBA{
{0xff, 0xff, 0xff, 0xff},
{0xff, 0xff, 0x0, 0xff},
{0xff, 0x0, 0xff, 0xff},
{0xff, 0x0, 0x0, 0xff},
{0x0, 0xff, 0xff, 0xff},
{0x0, 0xff, 0x0, 0xff},
{0x0, 0x0, 0xff, 0xff},
{0x0, 0x0, 0x0, 0xff},
}
)
func update(screen *ebiten.Image) error {
if ebiten.IsRunningSlowly() {
return nil
}
const (
ox = 10
oy = 10
dx = 60
dy = 50
)
screen.Fill(color.NRGBA{0x00, 0x40, 0x80, 0xff})
op := & ebiten.DrawImageOptions{}
op.GeoM.Translate(ox, oy)
screen.DrawImage(ebitenImage, op)
// Fill with solid colors
for i, c := range colors {
op := & ebiten.DrawImageOptions{}
x := i % 4
y := i/4 + 1
op.GeoM.Translate(ox+ float64(dx*x), oy+ float64(dy*y))
// Reset RGB (not Alpha) 0 forcibly
op.ColorM.Scale(0, 0, 0, 1)
// Set color
r := float64(c.R) / 0xff
g := float64(c.G) / 0xff
b := float64(c.B) / 0xff
op.ColorM.Translate(r, g, b, 0)
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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ebitenImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, " Flood fill with solid colors (Ebiten Demo)" ); err != nil {
log.Fatal(err)
}
}
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