indexing
	description: "Buffer manager for EV_BUFFER_PROJECTOR"
	author: "Etienne Amodeo"
	date: "$Date$"
	revision: "$Revision$"

deferred class
	EV_MODEL_BUFFER_MANAGER
	
feature -- Access

	drawable_position: EV_COORDINATE
			-- Position of `drawable' relative to `world'.
			
	drawable: EV_DRAWABLE is
			-- Object on which the diagram should be drawn.
		do
			Result := drawable_cell.item
		end
		
	drawable_cell: CELL [EV_DRAWABLE]
			-- Cell that contains `drawable'.

feature -- Element change

	set_drawable_position (a_drawable_position: EV_COORDINATE) is
			-- Set `drawable_position' to `a_drawable_position'.
		require
			a_drawable_position_not_void: a_drawable_position /= Void
		do
			drawable_position := a_drawable_position
		ensure
			drawable_position_assigned: drawable_position = a_drawable_position
		end

	set_drawable_cell_and_position (a_drawable_cell: like drawable_cell; a_position: EV_COORDINATE) is
			-- Set `a_drawable' to `drawable'.
		require
			a_drawable_not_void: a_drawable_cell /= Void
			a_position_not_void: a_position /= Void
		do
			set_drawable_position (a_position)
			set_drawable_cell (a_drawable_cell)
		ensure
			assigned: drawable_cell = a_drawable_cell
		end

	set_drawable_cell (a_drawable_cell: like drawable_cell) is
			-- Set `drawable' to `a_drawable'.
		require
			a_drawable_cell_not_void: a_drawable_cell /= Void
		do
			drawable_cell := a_drawable_cell
		ensure
			assigned: drawable_cell = a_drawable_cell
		end

end -- class EV_MODEL_BUFFER_MANAGER

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