[GRASS5] PNG driver bug?

[Glynn Clements]

Hamish wrote:

> > > I'm seeing something weird at the edges of images created with the
> > > PNG driver, maps aren't clipping to the edges correctly, looks like
> > > a bug...
> > > 
> > > see
> > >   http://bambi.otago.ac.nz/hamish/grass/png_bounds.html
> > > 
> > > further details at the link.
> > 
> > OK, I've read that, but I'm still not sure what your problem is
> > exactly.
> 
> example 1:
> 
> Top row gets color from d.erase, but d.vect.area part is clipped.
> Top right pixel is white.
> Second-to-bottom row is the same as the top, including right-most pixel
> being white. (examine with with xmag)
> Bottom row is all white.
> 
> example 2:
>   (GRASS_HEIGHT slightly reduced)
> 
> Right most column is all white.
> Bottom row is correct where d.vect.area has drawn, but white where
> d.erase should have drawn. (middle)
> 
> Doing a xwd on a XDRIVER monitor of the same dimensions gives a nice
> clean image without these artifacts.

OK, I've fixed a couple of off-by-one errors in Polygon_abs() and
Box_abs(); let me know if any problems remain.

-- 
Glynn Clements <glynn.clements at virgin.net>