2016-02-15 16:52:45 +01:00
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<!DOCTYPE html>
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<!--
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Copyright 2014 Hajime Hoshi
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<link rel="shortcut icon" href="../favicon.png" type="image/png" >
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<link rel="icon" href="../favicon.png" type="image/png" >
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<title>Ebiten example - alphablending</title>
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<style>
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body {
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font-family: sans-serif;
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}
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iframe {
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border-color: #999;
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border-style: solid;
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border-width: 1px;
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overflow: hidden;
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}
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pre {
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background: #eee;
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padding: 1em;
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}
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</style>
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<nav><a href="..">Ebiten</a></nav>
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<h1>Ebiten example - alphablending</h1>
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<iframe src="alphablending.content.html" width="640" height="480"></iframe>
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<pre><code>package main
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import (
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"image/color"
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_ "image/png"
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"log"
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2016-02-15 17:13:04 +01:00
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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2016-02-15 16:52:45 +01:00
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)
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const (
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screenWidth = 320
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screenHeight = 240
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)
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var (
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count int
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tmpRenderTarget *ebiten.Image
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ebitenImage *ebiten.Image
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saved bool
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)
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func update(screen *ebiten.Image) error {
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count++
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count %= 600
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diff := float64(count) * 0.2
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switch {
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case 480 < count:
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diff = 0
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case 240 < count:
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diff = float64(480-count) * 0.2
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}
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if err := tmpRenderTarget.Clear(); err != nil {
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return err
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}
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for i := 0; i < 10; i++ {
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(15+float64(i)*diff, 20)
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op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
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if err := tmpRenderTarget.DrawImage(ebitenImage, op); err != nil {
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return err
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}
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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++ {
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(0, float64(i)*diff)
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if err := screen.DrawImage(tmpRenderTarget, op); err != nil {
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return err
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}
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}
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return nil
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}
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func main() {
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var err error
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ebitenImage, _, err = ebitenutil.NewImageFromFile("images/ebiten.png", ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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tmpRenderTarget, err = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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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)
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}
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}
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</code></pre>
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<footer>© 2014 Hajime Hoshi</footer>
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