CGAL users discussion list

[Ben Supnik <>]

Hi Y'all,

I am trying to figure out how opposite-direction, 
identical-supporting-line curves are merged with the arrangement_2 package.

- If I insert a curve and at least part of the curve is "on top of" (but 
opposite direction) an existing curve, what happens?  (I _think_ in this 
case the newly inserted curve is _not_ inserted for this section.

- If I merge two maps that contain opposite direction, overlapping 
curves, which "direction" is chosen to make the new sub-curve 
representing the overlapping region?

(This is the case that I have no idea about...I looked through 
sweep_line_2 and the overlay visitor, and it appears that the choice of 
which direction to take is deterministic, but the sweep code makes my 
head hurt.)

cheers
ben
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