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  28  <H3><A NAME="8_3_1">8.3.1 Overview</A></H3>
  29  <P> Each data point in a polar plot is represented by a tuple consisting
  30   of a radius and an angle. The polar plot itself can be either outlined
  31   or filled. In addition each point may have a standard marker (the same
  32   as for line and scatter plots).</P>
  33  <P> The scale for the radius can be either linear or logarithmic.</P>
  34  <P> A polar graph is created by creating an instance of <A href="../ref/PolarGraph.html#_POLARGRAPH_POLARGRAPH">
  35  PolarGraph::PolarGraph()</A>. The polar graph type inherits all the
  36   capabilities of ordinary X-Y graphs, i.e they can have background
  37   images, background gradients, tabbed titles and so on.</P>
  38  <P> Polar graphs comes in two basic types, they can either show a full
  39   360 degree graph or a half 180 degree graph. The two examples below
  40   show these two basic types of graphs.</P>
  41  <P><DIV class="example">
  42  <BR> <A href="exframes/frame_polarex0.html" target="blank"><IMG border="0"
  43  HEIGHT="250"       src="img/img/img/img/img/img/polarex0.png" WIDTH="250"></A>
  44  <BR><B>Figure 139:</B> A simple 360 degree polar graph <A href="exframes/frame_polarex0.html"
  45  target="blank">[src]</A>&nbsp;
  46  <P></P>
  47  </DIV></P>
  48  <P><DIV class="example">
  49  <BR> <A href="exframes/frame_polarex0-180.html" target="blank"><IMG border="0"
  50  HEIGHT="250"       src="img/img/img/img/img/img/polarex0-180.png" WIDTH="250"></A>
  51  <BR><B>Figure 140:</B> The 180 degree variant polar plot. <A href="exframes/frame_polarex0-180.html"
  52  target="blank">[src]</A>&nbsp;
  53  <P></P>
  54  </DIV></P>
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