Re: polygon issues

[Ethan M. <merritt@u.washington.edu>]

On Wednesday 15 October 2008 08:05:26 Manfred Schwarb wrote:
> Hi,
> 
> I'm experimenting with the new polygon object and encountered two stumbling blocks.
> 
> 1) I'm doing something like
>      set object 1 polygon \
>   from screen 0.820186699373,0.915943621944 \
>      to screen 0.816522727098,0.922822961096 \
>      to screen 0.824158694467,0.917927083652 \
>      to screen 0.820186699373,0.915943621944 front fc ls 3 fs solid 1.0
> 
>   and I get "Polygon is not closed - adding extra vertex", although my polygon is 
>   perfectly closed?

For what it's worth, I don't get that warning message when I cut-and-paste your
above commands. Maybe it's due to rounding error when storing floating point numbers?
But that warning should not harm anything.

> 2) clipping:
>   At the plot borders, these objects seem to be clipped (cut off). As I use these objects as 
>   somehow generic drawing objects in a mixture with "set arrow", things become 
>   really messy, as arrows are not clipped.
>   What I would need are objects that are not clipped, so I can use the whole screen.
>   Up to now I found no way to deactivate this clipping feature. Is there a way to do so?

Heh.  You have no idea how much time I spent to get that clipping to work.

But yes, I can imagine there are cases when clipping is undesirable.
The question is: is that a property of the object or a property of the whole plot?
I'll have to think about it.

Which would be more obvious in your case?
   set clip <something>
   plot 'foo'
or
   set object 1 polygon noclip ....
   plot 'foo'

-- 
Ethan A Merritt