func oscilloscope(filename string) (err error) {
// Open the window.
err = win.Open(width, height, win.Resizeable)
if err != nil {
return errutil.Err(err)
}
defer win.Close()
f, err := os.Open(filename)
if err != nil {
return err
}
defer f.Close()
br := bufio.NewReader(f)
dec, magic, err := audio.NewDecoder(br)
if err != nil {
return err
}
fmt.Println("magic:", magic)
// Info about the sound, number of samples, sample rate etc.
conf := dec.Config()
fmt.Println(conf)
// Play the music.
go play(filename)
nsamples := conf.Channels * conf.SampleRate
buf := make(audio.PCM32Samples, nsamples/fps)
// Update and event loop.
for {
err := update(buf, dec)
if err != nil {
return errutil.Err(err)
}
// Poll events until the event queue is empty.
for e := win.PollEvent(); e != nil; e = win.PollEvent() {
switch e.(type) {
case we.Close:
os.Exit(0)
}
}
time.Sleep(time.Second / (fps * 2))
}
return nil
}
// simple demonstrates how to draw images using the Draw and DrawRect methods.
// It also gives an example of a basic event loop.
func simple() (err error) {
runtime.GOMAXPROCS(runtime.NumCPU())
defer profile.Start(profile.CPUProfile).Stop()
// Open the window.
err = win.Open(width, height, win.Resizeable)
if err != nil {
return err
}
defer win.Close()
// Load image resources.
err = loadResources()
if err != nil {
return err
}
defer freeResources()
// start and frames will be used to calculate the average FPS of the
// application.
start := time.Now()
frames := 0
// Render the images onto the window.
err = render()
if err != nil {
return err
}
// Update and event loop.
for {
// Display window updates on screen.
err = win.Update()
if err != nil {
return err
}
frames++
// Poll events until the event queue is empty.
for e := win.PollEvent(); e != nil; e = win.PollEvent() {
fmt.Printf("%T event: %v\n", e, e)
switch obj := e.(type) {
case we.KeyPress:
r := obj.Key.String()
err = zz(r)
case we.KeyRepeat:
r := obj.Key.String()
err = zz(r)
case we.KeyRune:
r := obj.String()
err = zz(r)
}
if err != nil {
return err
}
switch e.(type) {
case we.Close:
displayFPS(start, frames)
// Close the application.
return nil
case we.Resize:
// Rerender the images onto the window after resize events.
err = render()
if err != nil {
return err
}
}
}
// Cap refresh rate at 30 FPS.
time.Sleep(time.Second / 30)
}
}