CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

On 03/02/2012 09:06 AM, Mikhail Matrosov wrote:
> Thank you! And what if I want to consider iso_rectangle as thin, have
> starting point of ray inside it and want to find intersection as a point
> in this case (see picture)? Should I just take target() of segment found
> as an intersection?
Quickly looked at the code and I would say yes.

Sebastien.

> -----
> Best regards, Mikhail Matrosov
>
>
> 2012/3/2 Sebastien Loriot (GeometryFactory) 
> <
> <mailto:>>
>
>     The iso_rectangle is considered as full so that what you call
>     the two point case is the segment one.
>
>
>     #include <CGAL/Exact_predicates_exact___constructions_kernel.h>
>
>     int main(){
>
>       typedef CGAL::Exact_predicates_exact___constructions_kernel Kernel;
>       typedef Kernel::Point_2 Point_2;
>       typedef Kernel::Ray_2 Ray_2;
>       typedef Kernel::Iso_rectangle_2 Iso_rectangle_2;
>
>
>       Ray_2 r(Point_2(0,0),Point_2(1,1));
>       Iso_rectangle_2 rect(Point_2(0,0),Point_2(1,1)__);
>
>       CGAL::Object obj=CGAL::intersection(r,rect)__;
>       const Kernel::Segment_2* s=CGAL::object_cast<Kernel::__Segment_2>
>     (&obj);
>
>       CGAL_assertion(s!=NULL);
>
>       std::cout << *s << std::endl;
>
>     }
>
>
>
>     On 03/02/2012 08:55 AM, Mikhail Matrosov wrote:
>
>         There is a function Object intersection(Type1<Kernel> obj1,
>         Type2<Kernel> obj2) in CGAL which will return an object,
>         representing
>         intersection of two given objects of different possible types. It is
>         said, that intersection of Iso_rectangle_2 and Ray_2 is either
>         Point_2
>         or Segment_2.
>
>         And what about the case when ray intersects rectangle in two
>         points (see
>         attached picture)? Cannot see anything about it in the manual.
>
>         -----
>         Best regards, Mikhail Matrosov
>
>
>
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