[pstricks] filling non-simply connected regions

[Zbigniew Nitecki]

I wanted to draw an annulus, filled in light gray, with arrows along  
the edges.
The code below gives more-or-less what I want (although I am not sure  
how to get rid of the
gaps in the circles):
**********************************************
\begin{pspicture}(-3.5,-3)(3.5,3.5)
			\pscircle[fillstyle=solid, fillcolor=lightgray, linestyle=none](0,0) 
{2}
			\pscircle[fillstyle=solid, fillcolor=white, linestyle=none](0,0){1}
			\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{20}{100}
			\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{100}{180}
			\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{180}{260}
			\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{260}{340}
			\psarc[linewidth=2pt](0,0){2}{340}{20}

			\psarcn[liftpen=2,linewidth=2pt, arrows=->, arrowscale=2](0,0){1} 
{340}{260}
			\psarcn[linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{260}{180}
			\psarcn[linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{180}{100}
			\psarcn[linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{100}{20}
			\psarcn[linewidth=2pt](0,0){1}{20}{260}
\end{pspicture}
*****************************************************
But I wonder if there is a way of filling the annulus using
a single \pscustom command.  The following code gives the second  
picture below: the main problem is the small bit of filled-in area  
inside the "hole", another is that the lines print thin, and the  
arrows are cut in half.  (Also, I needed to leave off the last arrow  
because otherwise I got an even worse picture):
*******************************************************
\begin{pspicture}(-3.5,-3)(3.5,3.5)
	\pscustom[fillstyle=solid, fillcolor=lightgray]{
		\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{20}{100}
		\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{100}{180}
		\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{180}{260}
		\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{260}{340}
		\psarc[linewidth=2pt](0,0){2}{340}{20}

		\psarcn[liftpen=2,linewidth=2pt, arrows=->, arrowscale=2](0,0){1} 
{340}{260}
		\psarcn[linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{260}{180}
		\psarcn[linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{180}{100}
		\psarcn[linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{100}{20}
		\psarcn[linewidth=2pt](0,0){1}{20}{260}
}
\end{pspicture}
***************************************************************
Output pdf attached:


Zbigniew Nitecki
Department of Mathematics
Tufts University
Medford, MA 02155

telephones:
Office    (617)627-3843
Dept.    (617)627-3234
Dept. fax    (617)627-3966
http://www.tufts.edu/~znitecki/

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