Flash CS4 Resources

HalfEdge object

Availability

Flash MX 2004.

Description

The HalfEdge object is the directed side of the edge of a Shape object. An edge has two half edges. You can transverse the contours of a shape by “walking around” these half edges. For example, starting from a half edge, you can trace all the half edges around a contour of a shape, and return to the original half edge.

Half edges are ordered. One half edge represents one side of the edge; the other half edge represents the other side.

Method summary

The following methods are available for the HalfEdge object:

Method	Description
`halfEdge.getEdge()`	Gets the Edge object for the HalfEdge object.
`halfEdge.getNext()`	Gets the next half edge on the current contour.
`halfEdge.getOppositeHalfEdge()`	Gets the HalfEdge object on the other side of the edge.
`halfEdge.getPrev()`	Gets the preceding HalfEdge object on the current contour.
`halfEdge.getVertex()`	Gets the Vertex object at the head of the HalfEdge object.

Property summary

The following properties are available for the HalfEdge object:

Property	Description
`halfEdge.id`	Read-only; a unique integer identifier for the HalfEdge object.
`halfEdge.index`	An integer with a value of 0 or 1 that specifies the index for this HalfEdge object in the parent edge.