CGAL users discussion list

[Ashwin Nanjappa <>]

Mahmood Naderan wrote:
> [...] Now if I want to draw 
> a conic arc:
>       Rat_circle_2        Circ2;
>       Conic_arc_2         con;
>       Point_2             s, e;
>       *w << Conic_arc_2 ( Circ2, CGAL::COUNTERCLOCKWISE, s, e );
> At this line I get:
> error C2678: binary '<<' : no operator found which takes a left-hand 
> operand of type 'CGAL::Qt_widget' (or there is no acceptable conversion)
>  
> Am I right? How can I draw a conic arc from one point to another point 
> (with a given center)?

I haven't used Qt_widget, so I might be wrong here ... are you sure 
Qt_widget can handle/draw that type? From your earlier emails, I presume 
that the Conic_arc_2 you're using is a typedef of Traits_2::Curve_2 


On referring to the documentation for Qt_widget, I see that Curve_2 isn't 
listed as a supported type:
<http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Qt_widget_ref/Class_Qt_widget.html>

~ash