Re: [Plplot-general] Polygons get clipped by removing the vertices

[Arjen M. <arj...@wl...>]

Maurice LeBrun wrote:
> 

> 
> Polygon clipping is fairly complex.  The issue really raised its head when I
> implemented zooming in the plplot TK interface and started doing a lot of
> shade plotting, way back in '94 or so.  I worked on it for a while before
> giving up due to lack of progress even though there were still a lot of
> problems with it.  As an example, run "x16c -dev tk", zoom in on a section and
> then pan around.
> 
> Anyway I decided to take another look at the code and noticed right away
> problems with the existing approach.  Emboldened, I set about to improve it
> and now am happy to say it works much better than before.  Grab the latest
> src/plline.c from cvs HEAD and see if the new code fixes your problem.
> 
> Note it still does not work perfectly -- at a sufficiently high level of
> zooming we start to get clipping problems again.  These I suspect are due to a
> fidelity problem, either in clipline() or somewhere else.  Anyway no more time
> to work on it for now.
> 
>

That sounds great. When I wrote the original e-mail, I started thinking
how 
this could be improved - I soon realised that a completely general
solution
is very difficult/tedious. I will have a look at the new source.

Thanks for looking into it.

Regards,

Arjen