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doc: Add new examples
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<!DOCTYPE html>
<!--
doc: Remove Change Log section and go generate
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Copyright 2013 The Ebiten Authors
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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 - audio</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 - audio</h1>
<iframe src="audio.content.html" width="640" height="480"></iframe>
<pre><code>package main
import (
&#34;fmt&#34;
&#34;image/color&#34;
doc: go generate
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&#34;io/ioutil&#34;
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&#34;log&#34;
&#34;time&#34;
&#34;github.com/hajimehoshi/ebiten&#34;
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&#34;github.com/hajimehoshi/ebiten/audio&#34;
&#34;github.com/hajimehoshi/ebiten/audio/vorbis&#34;
&#34;github.com/hajimehoshi/ebiten/audio/wav&#34;
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&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
)
const (
screenWidth = 320
screenHeight = 240
)
var (
playerBarImage *ebiten.Image
playerCurrentImage *ebiten.Image
)
func init() {
var err error
playerBarImage, err = ebiten.NewImage(300, 4, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
playerBarImage.Fill(&amp;color.RGBA{0x80, 0x80, 0x80, 0xff})
playerCurrentImage, err = ebiten.NewImage(4, 10, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
playerCurrentImage.Fill(&amp;color.RGBA{0xff, 0xff, 0xff, 0xff})
}
type Player struct {
audioPlayer *audio.Player
total time.Duration
}
var (
audioContext *audio.Context
musicPlayer *Player
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seBytes []byte
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musicCh = make(chan *Player)
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seCh = make(chan []byte)
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mouseButtonState = map[ebiten.MouseButton]int{}
keyState = map[ebiten.Key]int{}
volume128 = 128
)
func playerBarRect() (x, y, w, h int) {
w, h = playerBarImage.Size()
x = (screenWidth - w) / 2
y = screenHeight - h - 16
return
}
func (p *Player) updateSE() error {
doc: go generate
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if seBytes == nil {
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return nil
}
if !ebiten.IsKeyPressed(ebiten.KeyP) {
keyState[ebiten.KeyP] = 0
return nil
}
keyState[ebiten.KeyP]&#43;&#43;
if keyState[ebiten.KeyP] != 1 {
return nil
}
doc: go generate
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sePlayer, err := audio.NewPlayerFromBytes(audioContext, seBytes)
if err != nil {
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return err
}
return sePlayer.Play()
}
func (p *Player) updateVolume() error {
if p.audioPlayer == nil {
return nil
}
if ebiten.IsKeyPressed(ebiten.KeyZ) {
volume128--
}
if ebiten.IsKeyPressed(ebiten.KeyX) {
volume128&#43;&#43;
}
if volume128 &lt; 0 {
volume128 = 0
}
if 128 &lt; volume128 {
volume128 = 128
}
p.audioPlayer.SetVolume(float64(volume128) / 128)
return nil
}
func (p *Player) updatePlayPause() error {
if p.audioPlayer == nil {
return nil
}
if !ebiten.IsKeyPressed(ebiten.KeyS) {
keyState[ebiten.KeyS] = 0
return nil
}
keyState[ebiten.KeyS]&#43;&#43;
if keyState[ebiten.KeyS] != 1 {
return nil
}
if p.audioPlayer.IsPlaying() {
return p.audioPlayer.Pause()
}
return p.audioPlayer.Play()
}
func (p *Player) updateBar() error {
if p.audioPlayer == nil {
return nil
}
if !ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
mouseButtonState[ebiten.MouseButtonLeft] = 0
return nil
}
mouseButtonState[ebiten.MouseButtonLeft]&#43;&#43;
if mouseButtonState[ebiten.MouseButtonLeft] != 1 {
return nil
}
x, y := ebiten.CursorPosition()
bx, by, bw, bh := playerBarRect()
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const padding = 4
if y &lt; by-padding || by&#43;bh&#43;padding &lt;= y {
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return nil
}
if x &lt; bx || bx&#43;bw &lt;= x {
return nil
}
pos := time.Duration(x-bx) * p.total / time.Duration(bw)
return p.audioPlayer.Seek(pos)
}
func (p *Player) close() error {
return p.audioPlayer.Close()
}
func update(screen *ebiten.Image) error {
if musicPlayer == nil {
select {
case musicPlayer = &lt;-musicCh:
default:
}
}
doc: go generate
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if seBytes == nil {
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select {
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case seBytes = &lt;-seCh:
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default:
}
}
if musicPlayer != nil {
if err := musicPlayer.updateBar(); err != nil {
return err
}
if err := musicPlayer.updatePlayPause(); err != nil {
return err
}
if err := musicPlayer.updateSE(); err != nil {
return err
}
if err := musicPlayer.updateVolume(); err != nil {
return err
}
}
op := &amp;ebiten.DrawImageOptions{}
x, y, w, h := playerBarRect()
op.GeoM.Translate(float64(x), float64(y))
screen.DrawImage(playerBarImage, op)
currentTimeStr := &#34;00:00&#34;
if musicPlayer != nil {
c := musicPlayer.audioPlayer.Current()
// Current Time
m := (c / time.Minute) % 100
s := (c / time.Second) % 60
currentTimeStr = fmt.Sprintf(&#34;%02d:%02d&#34;, m, s)
// Bar
cw, ch := playerCurrentImage.Size()
cx := int(time.Duration(w)*c/musicPlayer.total) &#43; x - cw/2
cy := y - (ch-h)/2
op := &amp;ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(cx), float64(cy))
screen.DrawImage(playerCurrentImage, op)
}
msg := fmt.Sprintf(`FPS: %0.2f
Press S to toggle Play/Pause
Press P to play SE
Press Z or X to change volume of the music
%s`, ebiten.CurrentFPS(), currentTimeStr)
if musicPlayer == nil {
msg &#43;= &#34;\nNow Loading...&#34;
}
ebitenutil.DebugPrint(screen, msg)
doc: Generate
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if err := audioContext.Update(); err != nil {
return err
}
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return nil
}
func main() {
wavF, err := ebitenutil.OpenFile(&#34;_resources/audio/jab.wav&#34;)
if err != nil {
log.Fatal(err)
}
oggF, err := ebitenutil.OpenFile(&#34;_resources/audio/ragtime.ogg&#34;)
if err != nil {
log.Fatal(err)
}
const sampleRate = 22050
const bytesPerSample = 4 // TODO: This should be defined in audio package
audioContext, err = audio.NewContext(sampleRate)
if err != nil {
log.Fatal(err)
}
go func() {
s, err := wav.Decode(audioContext, wavF)
if err != nil {
log.Fatal(err)
return
}
doc: go generate
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b, err := ioutil.ReadAll(s)
if err != nil {
log.Fatal(err)
return
}
seCh &lt;- b
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close(seCh)
}()
go func() {
s, err := vorbis.Decode(audioContext, oggF)
if err != nil {
log.Fatal(err)
return
}
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p, err := audio.NewPlayer(audioContext, s)
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if err != nil {
log.Fatal(err)
return
}
musicCh &lt;- &amp;Player{
audioPlayer: p,
total: time.Second * time.Duration(s.Size()) / bytesPerSample / sampleRate,
}
close(musicCh)
// TODO: Is this goroutine-safe?
p.Play()
}()
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Audio (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
if musicPlayer != nil {
if err := musicPlayer.close(); err != nil {
log.Fatal(err)
}
}
}
</code></pre>
doc: go generate
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<footer>© 2013 Hajime Hoshi</footer>
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