partition.coffee

class Partition
  constructor: (@size,@parent)->
    # init our 2d array for this partition
    @matrix = new Array @size
    for row, idx in @matrix
      @matrix[idx] = new Array @size

  jobs: 0
  drop: (x,y,done)->
    @jobs++

    if 0 <= x < @size || 0 <= y < @size
      # drop to parent if outside bounds
      # Not Our Problem Anymore™
      @parent.drop x, y
    else
      # drop to self, maybe topple
      @matrix[x][y] = ( @matrix[x][y] || 0 )  + 1
      @topple x, y if @matrix[x][y] == 4

    @jobs--
    done() if @jobs is 0

  topple: (x,y)->
    @matrix[x][y] = 0
    @drop x+1, y
    @drop x-1, y
    @drop x, y+1
    @drop x, y-1

table.coffee

class Sandpile
  constructor: (@size,@canvas_id)->
    # create partitions

    # init canvas for writing


  drop: (x,y)->
    # figure out which partition to delegate to
    # increment job count for that part by one
    # call drop on partition at x,y with decr cb


  decr: (part)->
    # decrement job count for part
    # if 0 jobs
      # are all parts done?
        # next frame