# The root class of the living objects (sprites, group of sprites, etc.)
abstract class LiveObject
	# Compute the position, state and appearance.
	fun update do end

	# Controls whether `update' and `draw' are automatically called by `LiveGroup'
	var exists = true is writable

	# Redefine this method to asks how to draw on a view
	fun draw(view: View) is abstract
end