mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 21:32:20 +02:00
121 lines
2.8 KiB
HTML
121 lines
2.8 KiB
HTML
<!DOCTYPE html>
|
|
<!--
|
|
Copyright 2013 The Ebiten Authors
|
|
|
|
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.
|
|
-->
|
|
<link rel="shortcut icon" href="../favicon.png" type="image/png" >
|
|
<link rel="icon" href="../favicon.png" type="image/png" >
|
|
<title>Ebiten example - alphablending</title>
|
|
<style>
|
|
body {
|
|
font-family: sans-serif;
|
|
}
|
|
iframe {
|
|
border-color: #999;
|
|
border-style: solid;
|
|
border-width: 1px;
|
|
overflow: hidden;
|
|
}
|
|
pre {
|
|
background: #eee;
|
|
padding: 1em;
|
|
}
|
|
</style>
|
|
<nav><a href="..">Ebiten</a></nav>
|
|
|
|
<h1>Ebiten example - alphablending</h1>
|
|
<iframe src="alphablending.content.html" width="640" height="480"></iframe>
|
|
<pre><code>// +build example
|
|
|
|
package main
|
|
|
|
import (
|
|
"image/color"
|
|
_ "image/png"
|
|
"log"
|
|
|
|
"github.com/hajimehoshi/ebiten"
|
|
"github.com/hajimehoshi/ebiten/ebitenutil"
|
|
)
|
|
|
|
const (
|
|
screenWidth = 320
|
|
screenHeight = 240
|
|
)
|
|
|
|
var (
|
|
count int
|
|
ebitenImage *ebiten.Image
|
|
)
|
|
|
|
type imageParts struct {
|
|
diff float64
|
|
}
|
|
|
|
func (p *imageParts) Src(i int) (int, int, int, int) {
|
|
w, h := ebitenImage.Size()
|
|
return 0, 0, w, h
|
|
}
|
|
|
|
func (p *imageParts) Dst(i int) (int, int, int, int) {
|
|
x := int(float64(i%10)*p.diff + 15)
|
|
y := int(float64(i/10)*p.diff + 20)
|
|
w, h := ebitenImage.Size()
|
|
return x, y, x + w, y + h
|
|
}
|
|
|
|
func (p *imageParts) Len() int {
|
|
return 10 * 10
|
|
}
|
|
|
|
func update(screen *ebiten.Image) error {
|
|
count++
|
|
count %= ebiten.FPS * 10
|
|
diff := float64(count) * 0.2
|
|
switch {
|
|
case 480 < count:
|
|
diff = 0
|
|
case 240 < count:
|
|
diff = float64(480-count) * 0.2
|
|
}
|
|
|
|
if err := screen.Fill(color.NRGBA{0x00, 0x00, 0x80, 0xff}); err != nil {
|
|
return err
|
|
}
|
|
op := &ebiten.DrawImageOptions{}
|
|
op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
|
|
op.ImageParts = &imageParts{
|
|
diff: diff,
|
|
}
|
|
if err := screen.DrawImage(ebitenImage, op); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func main() {
|
|
var err error
|
|
ebitenImage, _, err = ebitenutil.NewImageFromFile("_resources/images/ebiten.png", ebiten.FilterNearest)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Alpha Blending (Ebiten Demo)"); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|
|
</code></pre>
|
|
|
|
|
|
<footer>© 2013 Hajime Hoshi</footer>
|