    deferred class
    	EV_MODEL_BUFFER_MANAGER

    General
    	cluster: interface
    	description: "Buffer manager for EV_BUFFER_PROJECTOR"

    Ancestors
    	ANY

    Queries
    	drawable: EV_DRAWABLE
    	drawable_cell: CELL [EV_DRAWABLE]
    	drawable_position: EV_COORDINATE

    Commands
    	set_drawable_cell (a_drawable_cell: [like drawable_cell] CELL [EV_DRAWABLE])
    	set_drawable_cell_and_position (a_drawable_cell: [like drawable_cell] CELL [EV_DRAWABLE]; a_position: EV_COORDINATE)
    	set_drawable_position (a_drawable_position: EV_COORDINATE)