class AnimationFrame
  constructor : (@image, @holdFrames = 0) ->

class Animation
  currentFrame : 1
  constructor : (@frames) ->

  yield : () ->
    currentFrame = @currentFrame
    frameCount = 0
    totalFrames = 0
    yield = undefined
    _.each @frames, (frame, key) ->
      lastFrameCount = frameCount
      frameCount += frame.holdFrames
      if currentFrame > lastFrameCount and currentFrame <= frameCount
        yield = frame
    if currentFrame >= frameCount
      @currentFrame = 1
    else
      @currentFrame++
    return yield