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class Morris.Area extends Morris.Line

  # Initialise

  #

  areaDefaults =

    fillOpacity: 'auto'

    behaveLikeLine: false

  constructor: (options) ->

    return new Morris.Area(options) unless (@ instanceof Morris.Area)

    areaOptions = $.extend {}, areaDefaults, options

    @cumulative = not areaOptions.behaveLikeLine

    if areaOptions.fillOpacity is 'auto'

      areaOptions.fillOpacity = if areaOptions.behaveLikeLine then .8 else 1

    super(areaOptions)

  # calculate series data point coordinates

  #

  # @private

  calcPoints: ->

    for row in @data

      row._x = @transX(row.x)

      total = 0

      row._y = for y in row.y

        if @options.behaveLikeLine

          @transY(y)

        else

          total += (y || 0)

          @transY(total)

      row._ymax = Math.max row._y...

  # draw the data series

  #

  # @private

  drawSeries: ->

    @seriesPoints = []

    if @options.behaveLikeLine

      range = [0..@options.ykeys.length-1]

    else

      range = [@options.ykeys.length-1..0]

    for i in range

      @_drawFillFor i

      @_drawLineFor i

      @_drawPointFor i

  _drawFillFor: (index) ->

    path = @paths[index]

    if path isnt null

      path = path + "L#{@transX(@xmax)},#{@bottom}L#{@transX(@xmin)},#{@bottom}Z"

      @drawFilledPath path, @fillForSeries(index)

  fillForSeries: (i) ->

    color = Raphael.rgb2hsl @colorFor(@data[i], i, 'line')

    Raphael.hsl(

      color.h,

      if @options.behaveLikeLine then color.s * 0.9 else color.s * 0.75,

      Math.min(0.98, if @options.behaveLikeLine then color.l * 1.2 else color.l * 1.25))

  drawFilledPath: (path, fill) ->

    @raphael.path(path)

      .attr('fill', fill)

      .attr('fill-opacity', @options.fillOpacity)

      .attr('stroke', 'none')