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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              h1 Percussion
section.switches.loading
  .start.hidden
    button type="button" Start
  - keys = [ "a", "s", "d", "f", "j", "k", "l", ";" ]
  - %w( highHat crash bell rim snare tom1 tom2 kick ).each_with_index do |instrument, i|
    .instrument data-instrument=instrument
      - 16.times do |tick|
        button.tick type="checkbox" data-tick=tick = keys[i]
p Built by <a href="https://twitter.com/LandonSchropp" target="_blank">Landon Schropp</a> as part of the <a href="https://codepen.io/collection/fDxJj/" target="_blank">Randoms Collection</a>
            
          
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              $purple: #B36FFE

html, body
  height: 100%
  min-height: 50vw
  margin: 0
  padding: 0
  font-size: 16px
  overflow: hidden
  
  font-family: 'Open Sans', sans-serif

  -webkit-text-size-adjust: none
    
  @media (min-width: 640px)
    font-size: 18px
  
*
  box-sizing: border-box
  outline: none

body
  display: flex
  flex-direction: column
  align-items: center
  justify-content: center
  background-color: #333
  
h1, p, a
  color: #888
  margin: 1rem 0
  text-align: center
  line-height: 1.25rem
    
button
  cursor: pointer
    
h1
  font-size: 1.75rem
  font-weight: 800
    
.switches
  width: 95vw
  height: 47.5vw
  max-width: 960px
  max-height: 480px
  position: relative
    
  display: flex
  flex-direction: column
    
  &::before, &::after
    position: absolute
    content: ""
    top: 0
    right: 0
    bottom: 0
    left: 0
      
    opacity: 0
    transition: opacity 0.15s linear
    pointer-events: none
    
  &::before
    background-color: transparentize(#333, 0.1)
      
  &::after
    background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/49705/spinner_purple.svg)
    background-repeat: no-repeat
    background-position: 50%
    background-size: 4%
    animation: rotate 0.75s infinite linear
      
  &.loading::before, &.loading::after
    opacity: 1
    pointer-events: auto
    
.start
  position: absolute
  top: 0
  right: 0
  bottom: 0
  left: 0
  display: flex
  align-items: center
  justify-content: center
    
  transition: opacity 0.15s linear
  opacity: 1
  background-color: transparentize(#333, 0.1)
    
  &.hidden
    opacity: 0
    pointer-events: none
    
  button
    background-color: $purple
    border-width: 0
    border-radius: 0.25rem
    color: lighten($purple, 20%)
    font-size: 2.5vw
    padding: 1vw 3vw
    
    
.instrument
  display: flex
  flex: 1
  
.tick
  flex: 1
  padding: 0
  margin: 0
  
  font-size: 3vw
  color: transparent
  
  border-width: 0
  margin: 1px
  background-color: #444
    
  &.current
    background-color: #555
    color: #777
      
  &.active
    background-color: $purple
    box-shadow: inset 1px 1px darken($purple, 5%), inset -1px -1px darken($purple, 5%)
      
  &.current.active
    color: lighten($purple, 10%)
      
  // HACK: For some reason, iOS doens't like the hit aniamtion. This ensures it only occurs on desktop browsers.
  .no-touch &.current.active
    animation: hit 0.25s
      
@keyframes hit
  0%
    transform: scale3d(1, 1, 1)
  5%
    transform: scale3d(1.2, 1.2, 1)
  100%
    transform: scale3d(1, 1, 1)
      
@keyframes rotate
  0%
    transform: rotateZ(0deg)
  100%
    transform: rotateZ(360deg)
            
          
!
            
              # Enable FastClick
$ -> FastClick.attach(document.body)

# Represets a sound.
class Sound
  
  # Constructs the sound.
  constructor: (@_name) -> @howlerSound()
    
  # Returns a promise that's resolved when the sound loads.
  loadingPromise: -> @_loadingPromise ?= new $.Deferred()
  
  # Returns the URL for the Sound with the provided name.
  url: -> "https://s3-us-west-2.amazonaws.com/s.cdpn.io/49705/#{ @_name }.mp3"
  
  # Plays the Sound.
  play: -> @howlerSound().play()
  
  # Returns the Howler object for this Sound.
  howlerSound: -> 
    @_howlerSound ?= new Howl({ 
      urls: [ @url() ] 
      onload: => @loadingPromise().resolve()
      onloaderror: => @loadingPromise().reject()
     })

class SoundBoard
  @SOUND_NAMES = [ "highHat", "crash", "bell", "rim", "snare", "tom1", "tom2", "kick", "metronome" ]
  
  # Constructs this SoundBoard.
  constructor: -> @sounds()
  
  # An object containing the sounds in this SoundBobard.
  sounds: -> 
    return @_sounds if @_sounds?
    @_sounds = {}
    SoundBoard.SOUND_NAMES.forEach (soundName) => @_sounds[soundName] = new Sound(soundName)
    
  # Returns a sound in this SoundBoard.
  sound: (soundName) -> @_sounds[soundName]
  
  # Plays the sound with the provided name.
  play: (soundName) -> @sound(soundName).play()
  
  # Returns a promise that resolves when all of the sounds have loaded.
  loadingPromise: -> 
    @_loadingPromise ?= $.when.apply($, 
      @_soundsArray().map (sound) => sound.loadingPromise()
    )
    
  # An array of the sound objects in this SoundBoard.
  _soundsArray: -> Object.keys(@sounds()).map (soundName) => @sound(soundName)
  
class BeatMachine
  
  # Constructs the BeatMachine.
  constructor: (@_beatsPerMinute, @_beatsPerMeasure, @_ticksPerBeat) -> 
    @_soundBoard = new SoundBoard()
    
  # Returns the sound board for this BeatMachine.
  soundBoard: -> @_soundBoard
    
  # Returns a promise that resolves when the BeatMachine is loaded.
  loadingPromise: -> @_soundBoard.loadingPromise()
    
  # Called every time the BeatMachine ticks.
  play: (tick) ->
    SoundBoard.SOUND_NAMES.forEach (soundName) =>
      @_soundBoard.play(soundName) if @switches()[soundName][tick]
      
  # Toggles the sound for the provided tick. Returns true if the sound was toggled on and false if it was toggled off.
  toggle: (soundName, tick) -> @switches()[soundName][tick] = not @switches()[soundName][tick]
  
  # Returns the number of ticks per measure
  ticksPerMeasure: -> @_beatsPerMeasure * @_ticksPerBeat
  
  # Returns the number of ticks per minute.
  ticksPerMinute: -> @_beatsPerMinute * @_ticksPerBeat
    
  switches: ->
    return @_switches if @_switches?
    @_switches = {}
    
    SoundBoard.SOUND_NAMES.forEach (soundName) => 
      @_switches[soundName] = [0...(@ticksPerMeasure())].map -> false
      
    [0...@_beatsPerMeasure].forEach (beat) => @toggle("metronome", beat * @_ticksPerBeat)
    @_switches
  
class BeatMachineView
  
  # The keyboard keys.
  @KEYS: [ "a", "s", "d", "f", "j", "k", "l", ";" ]
  
  # Constructs the BeatMachineView.
  constructor: (@_$element, @_beatMachine) ->
    @_$element.find(".tick").click (event) => @toggle($(event.target))
    $("body").keypress (event) => @_keyPressed(String.fromCharCode(event.which))
    $(".start").click => @start()
    
    @_beatMachine.loadingPromise().then => 
      @_$element.removeClass("loading")
      if $("html").hasClass("touch") then $(".start").removeClass("hidden") else @start()
    
  # Starts the BeatMachineView.
  start: ->
    @_subtick = -1
    @_tick = -1
    setInterval((=> @_subticked()), 60000 / @_beatMachine.ticksPerMinute() / 2)
    
    # hide the controls if they're not already hidden
    $(".start").addClass("hidden")
    
    # Play a sound when started so sound is enabled on mobile browsers
    @_beatMachine.soundBoard().play("metronome") if $("html").hasClass("touch")
    
  # Called every time a subtick occurred. This is necessary to allow keyboard input to fire before the sound has played.
  _subticked: ->
    @_subtick = (@_subtick + 1) % 2
    @_ticked() if @_subtick is 0
    
  # Called every time the sound ticks.
  _ticked: ->
    @_tick = (@_tick + 1) % @_beatMachine.ticksPerMeasure()
    @_beatMachine.play(@_tick)
    $(".tick").removeClass("current")
    $("[data-tick='#{ @_tick }']").addClass("current")
    
  # Fired whenever a key is pressed.
  _keyPressed: (key) ->
    instrument = SoundBoard.SOUND_NAMES[BeatMachineView.KEYS.indexOf(key)]
    return unless instrument?
    tick = (@_tick + @_subtick;) % @_beatMachine.ticksPerMeasure()
    @toggle(@$tick(instrument, tick))
    
  # Retrieves the element for the provided instrument and tick.
  $tick: (instrument, tick) ->
    @_$element.find("[data-instrument='#{ instrument }']").find("[data-tick='#{ tick }']")
    
  # Toggles the provided tick.
  toggle: ($tick) ->
    instrument = $tick.parent().data("instrument")
    tick = $tick.data("tick")
    active = @_beatMachine.toggle(instrument, tick)
    $tick.toggleClass("active", active)
    @_beatMachine.soundBoard().play(instrument) if active and @_subtick is 0
    
# Kick things off.
beatMachine = new BeatMachine(120, 4, 4)
$switches = $(".switches")
beatMachineView = new BeatMachineView($switches, beatMachine)

# Set the BeatMachine's initial values
switches = {
  "highHat": [ false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false ],
  "crash": [ false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false ],
  "bell": [ false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false ],
  "rim": [ true, false, false, false, true, true, true, false, false, true, false, false, true, false, false, false ],
  "snare": [ true, false, false, false, false, false, true, false, false, true, false, false, true, false, false, false ],
  "tom1": [ true, false, false, false, true, false, false, false, true, false, false, false, true, false, false, false ],
  "tom2": [ true, false, true, false, false, false, true, false, false, false, true, false, false, true, false, false ],
  "kick": [ true, false, false, false, true, false, false, false, true, false, false, false, true, false, false, false ]
}

Object.keys(switches).forEach (instrument) =>
  switches[instrument].forEach (enabled, tick) =>
    beatMachineView.toggle(beatMachineView.$tick(instrument, tick)) if enabled
            
          
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