ebiten/example/alphablending/main.go

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// Copyright 2014 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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package main
import (
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
"image/color"
_ "image/png"
"log"
)
const (
screenWidth = 320
screenHeight = 240
)
var (
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count int
tmpRenderTarget *ebiten.Image
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ebitenImage *ebiten.Image
saved bool
)
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func update(screen *ebiten.Image) error {
count++
count %= 600
diff := float64(count) * 0.2
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switch {
case 480 < count:
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diff = 0
case 240 < count:
diff = float64(480-count) * 0.2
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}
if err := tmpRenderTarget.Clear(); err != nil {
return err
}
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for i := 0; i < 10; i++ {
op := &ebiten.DrawImageOptions{
ColorMatrix: ebiten.ScaleColor(1.0, 1.0, 1.0, 0.5),
}
if err := tmpRenderTarget.DrawImageAt(ebitenImage, 15+int(float64(i)*diff), 20, op); err != nil {
return err
}
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}
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screen.Fill(color.NRGBA{0x00, 0x00, 0x80, 0xff})
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for i := 0; i < 10; i++ {
if err := screen.DrawImageAt(tmpRenderTarget, 0, int(float64(i)*diff), nil); err != nil {
return err
}
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}
if !saved && ebiten.IsKeyPressed(ebiten.KeySpace) {
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if err := ebitenutil.SaveImageAsPNG("out.png", screen); err != nil {
return err
}
saved = true
}
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return nil
}
func main() {
var err error
ebitenImage, _, err = ebitenutil.NewImageFromFile("images/ebiten.png", ebiten.FilterNearest)
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if err != nil {
log.Fatal(err)
}
tmpRenderTarget, err = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
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if err != nil {
log.Fatal(err)
}
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//update := update
//f, _ := os.Create("out.gif")
//update = ebitenutil.RecordScreenAsGIF(update, f, 100)
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Alpha Blending (Ebiten Demo)"); err != nil {
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log.Fatal(err)
}
}