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<title>PyXPlot Users' Guide: The polygon command</title>
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<b class="current">The <tt class="tt">polygon</tt> command</b>
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<div><h1 id="ex:polygon2">3.7 The <tt class="tt">polygon</tt> command</h1>
<p> <span class="upshape"><span class="mdseries"><span class="rm">A simple polygon.</span></span></span></p><div>
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<td style="border-top-style:solid; border-left:1px solid black; border-right:1px solid black; border-top-color:black; border-top-width:1px; text-align:left"><p> In this simple example, we use Pyxplot’s <tt class="tt">polygon</tt> command to generate a geometric shape from a list of points. </p></td>
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<td style="text-align:left; border-right:1px solid black; border-left:1px solid black"><p><tt class="ttfamily">points = [ [0,-1], [0, 1], [2, 2], [2,1], [8,1], <img src="images/img-0038.png" alt="$\backslash $" style="vertical-align:-5px;
width:7px;
height:18px" class="math gen" /></tt><br /><tt class="ttfamily"> [8,-1], [2,-1], [2,-2]]</tt><br /></p></td>
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<td style="text-align:left; border-right:1px solid black; border-left:1px solid black"><p><tt class="ttfamily">polygon points with fillcol gray50 col black</tt> </p></td>
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<img src="images/img-0574.png" alt="\includegraphics[width=8cm]{examples/eps/ex_polygon1}" style="width:8cm" /></center> </p></td>
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</div><p> <span class="upshape"><span class="mdseries"><span class="rm">The first eight regular polygons.</span></span></span></p><div>
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<td style="border-top-style:solid; border-left:1px solid black; border-right:1px solid black; border-top-color:black; border-top-width:1px; text-align:left"><p> This example uses Pyxplot’s flow control commands, together with its list methods and the <tt class="tt">polygon</tt> command, to generate a diagram of the first eight regular polygons. </p></td>
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<td style="text-align:left; border-right:1px solid black; border-left:1px solid black"><p><tt class="ttfamily">rotate(a) = matrix( [cos(a), -sin(a)], <img src="images/img-0038.png" alt="$\backslash $" style="vertical-align:-5px;
width:7px;
height:18px" class="math gen" /></tt><br /><tt class="ttfamily"> [sin(a), cos(a)] )</tt><br /></p></td>
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<td style="text-align:left; border-right:1px solid black; border-left:1px solid black"><p><tt class="ttfamily">subroutine makePolygon(Nsides, centre)</tt><br /><tt class="ttfamily"> {</tt><br /><tt class="ttfamily"> points = []</tt><br /><tt class="ttfamily"> for i=0 to Nsides</tt><br /><tt class="ttfamily"> {</tt><br /><tt class="ttfamily"> call points.append(centre + <img src="images/img-0038.png" alt="$\backslash $" style="vertical-align:-5px;
width:7px;
height:18px" class="math gen" /></tt><br /><tt class="ttfamily"> rotate(i/Nsides*unit(rev)) * vector(1,0))</tt><br /><tt class="ttfamily"> }</tt><br /><tt class="ttfamily"> polygon points with fillcol gray50 col black</tt><br /><tt class="ttfamily"> }</tt><br /></p></td>
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<td style="text-align:left; border-right:1px solid black; border-left:1px solid black"><p><tt class="ttfamily">set nodisplay ; set multiplot</tt><br /></p></td>
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<td style="text-align:left; border-right:1px solid black; border-left:1px solid black"><p><tt class="ttfamily">foreach datum x,y,Nsides,name in "–"</tt><br /><tt class="ttfamily"> {</tt><br /><tt class="ttfamily"> call makePolygon(Nsides,vector(x,y))</tt><br /><tt class="ttfamily"> text name at x,y-1.25</tt><br /><tt class="ttfamily"> }</tt><br /><tt class="ttfamily">0 0 3 Triangle</tt><br /><tt class="ttfamily">3 0 4 Square</tt><br /><tt class="ttfamily">6 0 5 Pentagon</tt><br /><tt class="ttfamily">0 4 6 Hexagon</tt><br /><tt class="ttfamily">3 4 7 Heptagon</tt><br /><tt class="ttfamily">6 4 8 Octagon</tt><br /><tt class="ttfamily">END</tt><br /></p></td>
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<td style="text-align:left; border-right:1px solid black; border-left:1px solid black"><p><tt class="ttfamily">set display ; refresh</tt> </p></td>
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<img src="images/img-0577.png" alt="\includegraphics[width=8cm]{examples/eps/ex_polygon2}" style="width:8cm" /></center> </p></td>
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