Geometry Boost List: [ggl] intersection_segment...

Subject: [ggl] intersection_segment...
From: Barend Gehrels (Barend.Gehrels)
Date: 2009-06-25 11:14:45

Hi Chris,

> BTW, linestring by linestring, which is what I actually need (I am now 
> doing linestring segment by linestring segment intersection) would be 
> great.
OK, that option will come as well (but don't know if that is in next 
half day ;-) )

Do you need *intersection points* as output of linestring/linestring? 
Because it is also thinkable to get *intersection linestrings* or even 
*segments*...

Regards, Barend

>
> But I can live with segment by segment...
>
> 2009/6/25 Barend Gehrels <Barend.Gehrels_at_[hidden] 
> <mailto:Barend.Gehrels_at_[hidden]>>
>
>     Hi Chris,
>
>     Sorry for the inconvenience. It was very old.
>
>     It will be replaced by a generic segment/segment intersection,
>     delivering one or two points.
>
>     This functionis there already but as a strategy (because it is
>     different in Cartesian than in Spherical systems). In this
>     strategy is specified what you want (intersection points, or just
>     how they intersect). It is internal, so more complicated. You
>     might call this directly using
>
>     #include <ggl/strategies/cartesian/cart_intersect.hpp>
>     #include <ggl/strategies/intersection_result.hpp>
>
>     #include <ggl/policies/relate/intersection_points.hpp>
>     ...
>
>         ggl::segment_intersection_points<P> is
>             = ggl::strategy::intersection::relate_cartesian_segments
>             <
>                 ggl::policies::relate::segments_intersection_points
>                     <
>                         segment_type,
>                         segment_type,
>                         ggl::segment_intersection_points<P>
>                     >
>             >::relate(segment_type(p1,p2), segment_type(p3,p4));
>
>
>     But maybe it is better to wait for half a day, I'll try make a
>     wrapper soon.
>
>     The generic linestring/linestring would be an option but also not
>     yet there.
>
>     Regards, Barend
>
>
>
>     Chris Browet wrote:
>>     ... seem to have disappeared in latest SVN.
>>
>>     As I understand the intersection algorithm is now generic, should
>>     it be replaced by a linestring/linestring intersection?
>>
>>     - Chris -
>>     ------------------------------------------------------------------------
>
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