Edge¶

class jwst.skymatch.region.Edge(name=None, start=None, stop=None, next=None)[source]

Edge representation

An edge has a “start” and “stop” (x,y) vertices and an entry in the GET table of a polygon. The GET entry is a list of these values:

[ymax, x_at_ymin, delta_x/delta_y]

Attributes Summary

Methods Summary

`compute_AET_entry`(edge)	Compute the entry for an edge in the current Active Edge Table
`compute_GET_entry`()	Compute the entry in the Global Edge Table
`intersection`(edge)
`is_parallel`(edge)

Attributes Documentation

Methods Documentation

compute_AET_entry(edge)[source]¶

Compute the entry for an edge in the current Active Edge Table

[ymax, x_intersect, 1/m] note: currently 1/m is not used

compute_GET_entry()[source]¶

Compute the entry in the Global Edge Table

[ymax, x@ymin, 1/m]