CGAL users discussion list

[Andreas Fabri <>]

I forgot this in my previous mail:

another source of inspiration might be the Constrained triangulation 
demo as it also draws the faces in a bounded domain.

andreas

On 23/07/2010 21:00, Yvan Maillot wrote:
> Hi Again,
>
> Sorry to post this again but I am looking for my mistake for a while, in vain.
> Any idea ?
>
> I am trying to extend TriangulationGraphicsItem<T>  with a class I called
> TriangulationGraphicsItemWithFaces<T>  in order to also draw faces (triangles)
> of a Delaunay triangulation.
>
> To do this I have overridden the drawAll method like as follow. It almost
> works: faces are drawn. But they are drawn at a wrong place. Faces are
> translated compared with edges and vertices. Indeed, the origin of the faces
> seems to be on the left top of the screen instead of being in the middle. I
> also tried to use resetMatrix() and so on, and other stuff but nothing works.
> I
> don't know at all where I'm wrong.
>
> What can I do to fix this problem?
>
> Thanks for your help.
>
> Yvan
>
> // The overridden method
> template<typename T>
> void
> TriangulationGraphicsItemWithFaces<T>::drawAll(QPainter *painter) {
> // Calling drawAll method of the TriangulationGraphicsItem<T>  super class
> TriangulationGraphicsItem<T>::drawAll(painter);
> if (visible_faces) {
> if (TriangulationGraphicsItem<T>::t->number_of_vertices()>  2) {
> QColor color(::Qt::blue);
> color.setAlpha(150);
> faces_brush.setColor(color);
> faces_brush.setStyle(::Qt::SolidPattern);
> painter->setBrush(faces_brush);
> painter->setPen(::Qt::NoPen);
>
> for (typename T::Finite_faces_iterator fit =
>
> TriangulationGraphicsItem<T>::t->finite_faces_begin();
> fit != TriangulationGraphicsItem<T>::t->finite_faces_end();
> ++fit) {
>
> TriangulationGraphicsItem<T>::painterostream<<
>
> TriangulationGraphicsItem<T>::t->triangle(fit);
>
> }
> }
> }
> }