ebiten/_docs/public/examples/sprites.html
2016-06-27 01:02:50 +09:00

189 lines
4.3 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 - sprites</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 - sprites</h1>
<iframe src="sprites.content.html" width="640" height="480"></iframe>
<pre><code>package main
import (
&#34;fmt&#34;
_ &#34;image/png&#34;
&#34;log&#34;
&#34;math/rand&#34;
&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
&#34;github.com/hajimehoshi/ebiten/examples/common&#34;
)
const (
screenWidth = 320
screenHeight = 240
)
var (
ebitenImage *ebiten.Image
ebitenImageWidth = 0
ebitenImageHeight = 0
)
type Sprite struct {
image *ebiten.Image
x int
y int
vx int
vy int
}
func (s *Sprite) Update() {
s.x &#43;= s.vx
s.y &#43;= s.vy
if s.x &lt; 0 {
s.x = -s.x
s.vx = -s.vx
}
if s.y &lt; 0 {
s.y = -s.y
s.vy = -s.vy
}
w, h := s.image.Size()
if screenWidth &lt;= s.x&#43;w {
s.x = 2*(screenWidth-w) - s.x
s.vx = -s.vx
}
if screenHeight &lt;= s.y&#43;h {
s.y = 2*(screenHeight-h) - s.y
s.vy = -s.vy
}
}
type Sprites struct {
sprites []*Sprite
num int
}
func (s Sprites) Update() {
for _, sprite := range s.sprites {
sprite.Update()
}
}
func (s Sprites) Len() int {
return s.num
}
func (s Sprites) Dst(i int) (x0, y0, x1, y1 int) {
if s.num &lt;= i {
return 0, 0, 0, 0
}
ss := s.sprites[i]
return ss.x, ss.y, ss.x &#43; ebitenImageWidth, ss.y &#43; ebitenImageHeight
}
func (s Sprites) Src(i int) (x0, y0, x1, y1 int) {
if s.num &lt;= i {
return 0, 0, 0, 0
}
return 0, 0, ebitenImageWidth, ebitenImageHeight
}
const (
MinSprites = 0
MaxSprites = 10000
)
var sprites = &amp;Sprites{make([]*Sprite, MaxSprites), 500}
func update(screen *ebiten.Image) error {
if ebiten.IsKeyPressed(ebiten.KeyLeft) {
sprites.num -= 20
if sprites.num &lt; MinSprites {
sprites.num = MinSprites
}
}
if ebiten.IsKeyPressed(ebiten.KeyRight) {
sprites.num &#43;= 20
if MaxSprites &lt; sprites.num {
sprites.num = MaxSprites
}
}
sprites.Update()
if ebiten.IsRunningSlowly() {
return nil
}
op := &amp;ebiten.DrawImageOptions{
ImageParts: sprites,
}
op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
if err := screen.DrawImage(ebitenImage, op); err != nil {
return err
}
msg := fmt.Sprintf(`FPS: %0.2f
Num of sprites: %d
Press &lt;- or -&gt; to change the number of sprites`, ebiten.CurrentFPS(), sprites.Len())
ebitenutil.DebugPrint(screen, msg)
return nil
}
func main() {
var err error
ebitenImage, _, err = common.AssetImage(&#34;ebiten.png&#34;, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
ebitenImageWidth, ebitenImageHeight = ebitenImage.Size()
for i := range sprites.sprites {
w, h := ebitenImage.Size()
x, y := rand.Intn(screenWidth-w), rand.Intn(screenHeight-h)
vx, vy := 2*rand.Intn(2)-1, 2*rand.Intn(2)-1
sprites.sprites[i] = &amp;Sprite{
image: ebitenImage,
x: x,
y: y,
vx: vx,
vy: vy,
}
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Sprites (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
}
</code></pre>
<footer>© 2013 Hajime Hoshi</footer>