Geometry Boost List: Re: [geometry] Interesection points

Subject: Re: [geometry] Interesection points
From: Tanaka Simon (tanakas_at_[hidden])
Date: 2013-08-20 10:30:31

i have a related question. i slightly modified the code you previously 
attached, Barend (see attachment).

- assume we have an intersection point C of a polygon with a 
segment/linestring. C lies on the segment defined by the pair of points 
A and B, which are stored in the polygon. is it possible to return A and 
B, not only C?
- is it possible to have a polygon made of segment, something like 
boost::geometry::model::polygon< segment > ?

questions not directly related to the thread's question, but related to 
the attached code (should i start a new topic?):
- i use a custom point class myPoint. how to register the getter and 
setter template methods (e.g. get<0>)?
- can i register std::shared_ptr<myPoint> instead of myPoint?
- why is boost::geometry::model::polygon< std::shared_ptr<point> > not 
working?

thanks
simon

On 08/19/2013 09:13 PM, Barend Gehrels wrote:
> Hi,
>
> On 16-8-2013 11:54, Hunk wrote:
>> hello sorry my example was wront
>
> Indeed wrong ;-)
>
>
>> he cant do the intersection between segment and polygon.
>
> That is correct, that combination is not yet possible. Will be done.
> However, with a linestring with two points you can do exactly this.
>
>>
>> It is possible to define lines with and origin point and a direction? 
>> not
>> only a segment?
>
> No unless you make it yourself (you can easily create a function doing 
> that). By default it is not supported.
>
>>
>> And i want the intersection point on the border of the polygon not the
>> segment inside.
>
> Intersection points, if any, should never be inside indeed, always on 
> the border.
>
> Attached my version of your program (now complete and compiling and 
> working).
>
> Regards, Barend
>
>
>
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