<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I wanted to draw an annulus, filled in light gray, with arrows along the edges.<div>The code below gives more-or-less what I want (although I am not sure how to get rid of the</div><div>gaps in the circles):</div><div>**********************************************</div><div><div>\begin{pspicture}(-3.5,-3)(3.5,3.5)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\pscircle[fillstyle=solid, fillcolor=lightgray, linestyle=none](0,0){2}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\pscircle[fillstyle=solid, fillcolor=white, linestyle=none](0,0){1}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{20}{100}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{100}{180}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{180}{260}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{260}{340}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarc[linewidth=2pt](0,0){2}{340}{20}</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarcn[liftpen=2,linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{340}{260}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarcn[linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{260}{180}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarcn[linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{180}{100}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarcn[linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{100}{20}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarcn[linewidth=2pt](0,0){1}{20}{260}</div><div>\end{pspicture}</div><div>*****************************************************</div><div>But I wonder if there is a way of filling the annulus using</div><div>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):</div><div>*******************************************************</div><div><div>\begin{pspicture}(-3.5,-3)(3.5,3.5)</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\pscustom[fillstyle=solid, fillcolor=lightgray]{</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{20}{100}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{100}{180}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{180}{260}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarc[linewidth=2pt, arrows=->, arrowscale=2](0,0){2}{260}{340}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarc[linewidth=2pt](0,0){2}{340}{20}</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarcn[liftpen=2,linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{340}{260}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarcn[linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{260}{180}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarcn[linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{180}{100}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarcn[linewidth=2pt, arrows=->, arrowscale=2](0,0){1}{100}{20}</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>\psarcn[linewidth=2pt](0,0){1}{20}{260}</div><div>}</div><div>\end{pspicture}</div><div>***************************************************************</div><div>Output pdf attached:</div><div></div></div></div></body></html>