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tomo-old/examples/piano/main.go

60 lines
1.5 KiB
Go

package main
import "github.com/faiface/beep"
import "github.com/faiface/beep/speaker"
import "github.com/faiface/beep/generators"
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/elements/fun"
import "git.tebibyte.media/sashakoshka/tomo/layouts/basic"
import "git.tebibyte.media/sashakoshka/tomo/elements/basic"
import "git.tebibyte.media/sashakoshka/tomo/elements/fun/music"
import _ "git.tebibyte.media/sashakoshka/tomo/backends/x"
const sampleRate = 44100
const bufferSize = 256
var tuning = music.EqualTemparment { A4: 440 }
var playing = map[music.Note] *beep.Ctrl { }
func main () {
speaker.Init(sampleRate, bufferSize)
tomo.Run(run)
}
func run () {
window, _ := tomo.NewWindow(2, 2)
window.SetTitle("Piano")
container := basicElements.NewContainer(basicLayouts.Vertical { true, true })
window.Adopt(container)
label := basicElements.NewLabel("Play a song!", false)
container.Adopt(label, false)
piano := fun.NewPiano(3, 5)
container.Adopt(piano, true)
piano.OnPress(playNote)
piano.OnRelease(stopNote)
window.OnClose(tomo.Stop)
window.Show()
}
func stopNote (note music.Note) {
if _, is := playing[note]; !is { return }
speaker.Lock()
playing[note].Streamer = nil
delete(playing, note)
speaker.Unlock()
}
func playNote (note music.Note) {
streamer, err := generators.SinTone(sampleRate, int(tuning.Tune(note)))
if err != nil { panic(err.Error()) }
stopNote(note)
speaker.Lock()
playing[note] = &beep.Ctrl { Streamer: streamer }
speaker.Unlock()
speaker.Play(playing[note])
}