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# joysticks

Go language joystick interface.

uses channels for events, so multi-threaded.

Overview/docs: [![GoDoc](https://godoc.org/github.com/splace/joysticks?status.svg)](https://godoc.org/github.com/splace/joysticks)

Installation:

     go get github.com/splace/joysticks

Example: play a note when pressing button #1. (button #10 to exit) hat changes frequency and volume, (y,x axes)

	package main

	import (

		"io"

		"os/exec"

		"time"

	)

	import . "github.com/splace/joysticks"

	import . "github.com/splace/sounds"

	func main(){

		events := Capture(

			channel{10, state.OnOpen}, // event[0] button #10 opens

			channel{1, state.OnClose}, // event[1] button #1 closes

			channel{1, state.OnMove},  // event[2] hat #1 moves

		)

		var x float32 = .5

		var f time.Duration = time.Second / 440

		for {

			select {

			case <-events[0]:

				return

			case <-events[1]:

				play(NewSound(NewTone(f, float64(x)), time.Second/3))

			case h := <-events[2]:

				x = h.(HatChangeEvent).x/2 + .5

				f = time.Duration(100*math.Pow(2, float64(h.(HatChangeEvent).y))) * time.Second / 44000

			}

		}

	}

	func play(s Sound) {

		cmd := exec.Command("aplay")

		out, in := io.Pipe()

		go func() {

			Encode(in, s, 44100,2)

			in.Close()

		}()

		cmd.Stdin=out 

		err := cmd.Run()

		if err != nil {

			panic(err)

		}

	}