I represent an event that occurs during the computation of line segment intersections.

Instance variables:
position <Point> The position of where this event occurs
type <Symbol> The type of the event
edge <LineIntersectionSegment> The edge associated with this event.
crossedEdge <LineIntersectionSegment> The crossing edge of a #cross event.

	initialize-release
	type:position:segment:

	sorting
	sortsBefore:

	accessing	top
	crossedEdge
	crossedEdge:
	edge
	position
	priority Return the priority for this event
	segment
	type

	initialize-release	top
	type:position:segment:

	sorting	top
	sortsBefore:

	instance creation	top
	type:position:segment: