La classe Animation

metaclass = {}



function metaclass.initClass(frames, duration, isLooping)
  local cls = {__type = "animation"}

  cls.frames = frames
  cls.nbFrames = #frames
  cls.duration = duration
  cls.speed = cls.nbFrames / cls.duration -- frames / seconde

  cls.isLooping = (isLooping ~= false)



  -- FONCTION D'INSTANCIATION
  function cls.new()
    local self = setmetatable({}, {__index = cls})

    cls:reset()

    return self
  end



  -- LES METHODES
  function cls:reset()
    self.isAnim = true
    self.elapsedTime = 0
    self.index = 1
    self.frame = cls.frames[self.index]
  end


  function cls:update(dt, reset)
    if reset == true then
      self:reset()

    else
      self.elapsedTime = self.elapsedTime + dt
      if self.elapsedTime > cls.duration then
        self.isAnim = cls.isLooping
      end

      if self.isAnim == true then
        self.index = math.floor(cls.speed * self.elapsedTime) + 1
        self.frame = cls.frames[self.index]
      end
    end

    return self.frame
  end


  return cls
end


return metaclass