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doc: Update

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This commit is contained in:
Hajime Hoshi 2016-02-13 23:08:01 +09:00
parent 5ec3180919
commit 816c6469a2
1 changed files with 20 additions and 5 deletions
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25
_docs/public/examples/piano.html
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@ -102,12 +102,18 @@ func (s *stream) Close() error {
return nil
}
func addNote(freq float64, vol float64) {
func addNote(freq float64, vol float64) error {
f := int(freq)
if n, ok := noteCache[f]; ok {
p := audio.NewPlayer(&stream{bytes.NewReader(n)}, sampleRate)
p, err := audio.NewPlayer(&stream{bytes.NewReader(n)}, sampleRate)
if err == audio.ErrTooManyPlayers {
return nil
}
if err != nil {
return err
}
p.Play()
return
return nil
}
length := len(pcm) * baseFreq / f
l := make([]int16, length)
@ -123,8 +129,15 @@ func addNote(freq float64, vol float64) {
}
n := toBytes(l, r)
noteCache[f] = n
p := audio.NewPlayer(&stream{bytes.NewReader(n)}, sampleRate)
p, err := audio.NewPlayer(&stream{bytes.NewReader(n)}, sampleRate)
if err == audio.ErrTooManyPlayers {
return nil
}
if err != nil {
return err
}
p.Play()
return nil
}
var keys = []ebiten.Key{
@ -217,7 +230,9 @@ func update(screen *ebiten.Image) error {
if keyStates[key] != 1 {
continue
}
addNote(220*math.Exp2(float64(i-1)/12.0), 1.0)
if err := addNote(220*math.Exp2(float64(i-1)/12.0), 1.0); err != nil {
return err
}
}
screen.Fill(color.RGBA{0x80, 0x80, 0xc0, 0xff})