Re: [Plplot-devel] Broken examples

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

"Alan W. Irwin" wrote:
> 
> On 2005-04-27 18:39-0700 Alan W. Irwin wrote:
> 
> >
> > For fresh checkout from CVS HEAD....
> >
> > ... if you look at how psc "paints" the last page, all but the perimeter
> > of the plot is layed down okay, then a solid blue square filling the entire
> > viewport overlays that...
> 
> Just had a quick thought.  I bet this be related to the change that Arjen
> recently made for clipping.  If you had a blue filled arrow intersecting the
> viewport clipping limit, and the clipping limit went the incorrect "long"
> way around the viewport boundaries you would get a blue square.  And the
> results could well depend on front end like I observed since there are small
> floating-point inconsistencies between front ends.
> 
> Arjen, could you please (a) confirm the problem, and (b) try privately
> reverting your change to see if this blue square problem for example 22 goes
> away?  For complicated fill shapes this is obviously (as Maurice also
> stated) a difficult piece of logic to get right.  Think of a fractal shape
> that you want to fill and also clip arbitrarily.  :-) If your change to that
> logic is the culprit, then it is "back to the drawing board" to figure out
> general clipping logic that works in all cases no matter how complicated the
> fill shape.
> 

Alan,

Example 22 is about arrows, I just checked it with the latest version
of plline.c (there were indeed a couple bugs in there) and found no 
obvious problem. I will need to check further as for some reason one
of the Windows-specific files will not compile in version 5.5.x - grrrr
...
linkage specification problems.

Regards,

Arjen

PS Example 22 by the way uses new C features that are not supported in
Windows/MSVC 6.0
- I will commit a new version.