CGAL users discussion list

[Daniel Russel <>]

Qt uses integer arithmetic in its drawing computations and so has  
serious issues with large objects (relative to the viewport) due to  
overflow. It typically helps drawing reliability to split large  
objects into a number of smaller ones. Not that this really helps you  
unless you want to mess with the CGAL code.

On May 15, 2008, at 2:03 PM, Emerson Carride wrote:

> I have a Delaunay triangulation, and I want to draw the Voronoi  
> diagram.
> But depending on the number of points in the triangulation,  
> sometimes does not appears a ray in the window.
> And when I click on the zoom button, or in another button on my  
> toolbar, appears the ray that not appeared before.
> to draw the diagram I'm using this function:
>
> dt.draw_dual(*widget);
>
> dt is the delaunay triangulation and *widget is where I draw the  
> triangulation/diagram
>
> Someone knows why this happens?
>
>
> --
> Emerson Amade Carride
> Matemática Aplicada e Computação Científica
> Instituto de Ciências Matemáticas e Computação
> USP - São Carlos
> tel: (16) 3411 0877; (11) 4538 3315 ; cel: (11) 71289888