Geometry Boost List: Re: [geometry] difference algorithm produces invalid polygon?

Subject: Re: [geometry] difference algorithm produces invalid polygon?
From: Barend Gehrels (barend_at_[hidden])
Date: 2012-02-28 13:51:43

Hi Volker,

In addition to this:

On 28-2-2012 19:31, Barend Gehrels wrote:
>> - Why would a polygon of only two distinct points be invalid in the 
>> first place? Is this considered "self-intersecting"?

It now throws because the intersection fails and it states that it is 
self-intersecting. In a future version we will distinguish between 
"self-intersecting", where a real intersection is, and "self-touching", 
which has a self tangency or other kind of artefact, but is not really 
intersecting. And it should not throw then (if throwing at all).

Regards, Barend