     @offsetY = 20
     @unitTime = 30
     @unitSpace = 10
+    @prev_start = -1
     @load()
 
   load: ->


  prepareData: (@days, @commits) ->
    @collectParents()

    for c in @commits
      c.isParent = true  if c.id of @parents
      @preparedCommits[c.id] = c

    @collectColors()


      $(window).on "mousemove", dragger

    $(window).on
      mouseup: =>
        $(window).off "mousemove", dragger
        @renderPartialGraph()
      keydown: (event) =>
        # left
        element.scrollLeft element.scrollLeft() - 50  if event.keyCode is 37
        # top
