CGAL users discussion list

["Thomas Zangl - Home" <>]

Am Fri, 8 Jun 2007 14:40:04 +0200, schrieb "Laurent Rineau" 
<>:

Hi!

>- K::Ray_2 represents an infinite subspace of R².
>- Circular_k::Line_arc_2 represents a finite segment of R², whose two 
>endpoints are models of CircularKernel::CircularArcPoint_2.

A Line_arc_2 has this c'tor:

 Line_arc_2<CircularKernel> la ( CircularKernel::Line_2 l, 
CircularKernel::Point_2 p1, CircularKernel::Point_2 p2);

Ok:

    Circular_k::Point_2 p1(1,1);
    Circular_k::Point_2 p2(5,5);
    Circular_k::Line_2 l(p1,p2);

    Circular_k::Line_arc_2 circularRay(l, p1, p2);

I get the following compile error:
alpha.cpp:214: error: no matching function for call to 
`CGAL::Line_arc_with_bbox_2<CGAL::Filtered_bbox_circular_kernel_2<CGAL::CK1> 
>::Line_arc_with_bbox_2(CGAL::Line_2<CGAL::Circular_kernel_2<CGAL::Linear_k1, 
CGAL::Algebraic_k1> >&, 
CGAL::Point_2<CGAL::Circular_kernel_2<CGAL::Linear_k1, CGAL::Algebraic_k1> 
>&, CGAL::Point_2<CGAL::Circular_kernel_2<CGAL::Linear_k1, 
CGAL::Algebraic_k1> >&)'
/home/TZi/CGAL-3.3/include/CGAL/Filtered_bbox_circular_kernel_2/Line_arc_with_bbox_2.h:35:
 note: candidates are: 
CGAL::Line_arc_with_bbox_2<CGAL::Filtered_bbox_circular_kernel_2<CGAL::CK1> 
>::Line_arc_with_bbox_2(const 
CGAL::Line_arc_with_bbox_2<CGAL::Filtered_bbox_circular_kernel_2<CGAL::CK1> 
>&)
/home/TZi/CGAL-3.3/include/CGAL/Filtered_bbox_circular_kernel_2/Line_arc_with_bbox_2.h:89:
 note:  CGAL::Line_arc_with_bbox_2<BK>::Line_arc_with_bbox_2(const typename 
BK::Circular_kernel::Line_arc_2&) [with BK = 
CGAL::Filtered_bbox_circular_kernel_2<CGAL::CK1>]
/home/TZi/CGAL-3.3/include/CGAL/Filtered_bbox_circular_kernel_2/Line_arc_with_bbox_2.h:84:
 note:  CGAL::Line_arc_with_bbox_2<BK>::Line_arc_with_bbox_2(const typename 
BK::Circular_kernel::Point_2&, const typename BK::Circular_kernel::Point_2&) 
[with BK = CGAL::Filtered_bbox_circular_kernel_2<CGAL::CK1>]
/home/TZi/CGAL-3.3/include/CGAL/Filtered_bbox_circular_kernel_2/Line_arc_with_bbox_2.h:78:
 note:  CGAL::Line_arc_with_bbox_2<BK>::Line_arc_with_bbox_2(const typename 
BK::Circular_kernel::Segment_2&) [with BK = 
CGAL::Filtered_bbox_circular_kernel_2<CGAL::CK1>]
/home/TZi/CGAL-3.3/include/CGAL/Filtered_bbox_circular_kernel_2/Line_arc_with_bbox_2.h:73:
 note:  CGAL::Line_arc_with_bbox_2<BK>::Line_arc_with_bbox_2(const typename 
BK::Circular_kernel::Line_2&, const typename BK::Circular_arc_point_2&, const 
typename BK::Circular_arc_point_2&) [with BK = 
CGAL::Filtered_bbox_circular_kernel_2<CGAL::CK1>]
/home/TZi/CGAL-3.3/include/CGAL/Filtered_bbox_circular_kernel_2/Line_arc_with_bbox_2.h:67:
 note:  CGAL::Line_arc_with_bbox_2<BK>::Line_arc_with_bbox_2(const typename 
BK::Circular_kernel::Line_2&, const typename BK::Circular_kernel::Line_2&, 
const typename BK::Circular_kernel::Line_2&) [with BK = 
CGAL::Filtered_bbox_circular_kernel_2<CGAL::CK1>]
/home/TZi/CGAL-3.3/include/CGAL/Filtered_bbox_circular_kernel_2/Line_arc_with_bbox_2.h:60:
 note:  CGAL::Line_arc_with_bbox_2<BK>::Line_arc_with_bbox_2(const typename 
BK::Circular_kernel::Line_2&, const typename BK::Circular_kernel::Circle_2&, 
bool, const typename BK::Circular_kernel::Circle_2&, bool) [with BK = 
CGAL::Filtered_bbox_circular_kernel_2<CGAL::CK1>]
/home/TZi/CGAL-3.3/include/CGAL/Filtered_bbox_circular_kernel_2/Line_arc_with_bbox_2.h:55:
 note:  CGAL::Line_arc_with_bbox_2<BK>::Line_arc_with_bbox_2() [with BK = 
CGAL::Filtered_bbox_circular_kernel_2<CGAL::CK1>]

Why?

l is a CircularKernel::Line_2
p1 and p2 are CircularKernel::Point_2's

So the c'tor is called correctly?

>Even with the linear CGAL kernel, you cannot convert a K::Ray_2 to a 
>K::Segment_2.

I noticed this, but luckily (for visualization) this was not yet
necessary. 

>If you want to convert a ray to a segment, you will need to clip the ray.

Example please? Something how to convert a Ray_2 from linear to
circular space would help most.

TIA,
-- 
----------------------------------------------------------------
,yours Thomas Zangl, Bakk.rer.soc.oec. - 

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