# File tk/lib/tk/canvas.rb, line 648
  def self.create(canvas, *args)
    unless self::CItemTypeName
      fail RuntimeError, "#{self} is an abstract class"
    end
    args, fontkeys = _parse_create_args(args)
    idnum = tk_call_without_enc(canvas.path, 'create', 
                                self::CItemTypeName, *args)
    canvas.itemconfigure(idnum, fontkeys) unless fontkeys.empty?
    idnum.to_i  # 'canvas item id' is an integer number
  end

# File tk/lib/tk/canvas.rb, line 592
  def TkcItem.id2obj(canvas, id)
    cpath = canvas.path
    return id unless CItemID_TBL[cpath]
    CItemID_TBL[cpath][id]? CItemID_TBL[cpath][id]: id
  end

# File tk/lib/tk/canvas.rb, line 660
  def initialize(parent, *args)
    #unless parent.kind_of?(TkCanvas)
    #  fail ArgumentError, "expect TkCanvas for 1st argument"
    #end
    @parent = @c = parent
    @path = parent.path

    @id = create_self(*args) # an integer number as 'canvas item id'
    CItemID_TBL[@path] = {} unless CItemID_TBL[@path]
    CItemID_TBL[@path][@id] = self
  end

# File tk/lib/tk/canvas.rb, line 588
  def TkcItem.type2class(type)
    CItemTypeToClass[type]
  end

# File tk/lib/tk/canvas.rb, line 688
  def delete
    @c.delete @id
    CItemID_TBL[@path].delete(@id) if CItemID_TBL[@path]
    self
  end

# File tk/lib/tk/canvas.rb, line 680
  def exist?
    if @c.find_withtag(@id)
      true
    else
      false
    end
  end

# File tk/lib/tk/canvas.rb, line 676
  def id
    @id
  end