Special cases of Weiler-Atherton

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I am writing Weiler-Atherton algorithm. I can't find full description of
this.
My source trial is on bitbucket on aborucki/weileratherton, this is unclear
of brute_force_intersections() function because I am moving form
brute-force to Bentley-Ottmann sweep line intersections.
I have two main rountines:
brute_force_intersections(): inserting points of intersections
unionWalk - walk over lists and make union two polygons.
In unionWalk are special cases: vertex of one polygon touch vertex second
polygon etc
Where can I find detail description of this algorithm?

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<div dir=3D"ltr">I am writing=C2=A0Weiler-Atherton algorithm. I can&#39;t f=
ind full description of this.=C2=A0<div>My source trial is on=C2=A0bitbucke=
t on=C2=A0aborucki/weileratherton, this is unclear of=C2=A0brute_force_inte=
rsections() function because I am moving form brute-force to=C2=A0Bentley-O=
ttmann sweep line intersections.</div><div>I have two main rountines:=C2=A0=
</div><div>brute_force_intersections(): inserting points of intersections<b=
r></div><div>unionWalk - walk over lists and make union two polygons.<br></=
div><div>In unionWalk are special cases: vertex of one polygon touch vertex=
 second polygon etc</div><div>Where can I find detail description of this a=
lgorithm?</div><div><br></div></div>

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