🚀 go-pugleaf

jtc@motcad.portal.com (J.T. Conklin) writes:

>I have been observing that stroking an arc with a ``thick'' line results
>in some areas of white peeking through the line --- especially about the
>outside perimeter --- on two independant PostScript implementation.

[text deleted...]

>Is this behavior acceptable?  I can't find any documentation on anything
>like a stroke step parameter.  Should the step size automagically get
>smaller when stroking an arc of sufficient curvature?

[program deleted...]

>I would be interested to know if this prints without white specks in the
>circle on a real Adobe Interpreter.

I tested on:

	1. Data Products LZR 2665 (39.0)
	2. Agfa P3400PS (48.1)
	3. Oce 6750 PS

All three gave a closed arc with no white specks anywhere.
The Data Products and Agfa have an official Adobe board,
the Oce uses a PostScript clone.

The GhostScript interpreter *did* give the effect you described.
I could solve this by adding a "closepath" after the "arc" call:

	[...]
	newpath
	0 0 radius points 3 div add 0 360 arc
	closepath					% <<<<<<<<
	[...]

And maybe you will also need to set the linejoin parameter:

	[...]
	1 setlinejoin					% <<<<<<<<
	newpath
	0 0 radius points 3 div add 0 360 arc
	closepath
	[...]


Jan van der Steen
-- 
    -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
     Jan van der Steen                 jansteen@cwi.nl
     Centre for Mathematics and Computer Science (CWI)
     Kruislaan 413, 1098 SJ Amsterdam, The Netherlands
--
    -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
     Jan van der Steen                 jansteen@cwi.nl
     Centre for Mathematics and Computer Science (CWI)
     Kruislaan 413, 1098 SJ Amsterdam, The Netherlands