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  27  <HR NOSHADE>
  28  <H2><A NAME="8_5">8.5 Field plots</A></H2>
  29  <P> A variant of scatter plot is the so called<I> Field Plots</I> this
  30   is basically a scatter plot where each scatter point is an arrow with a
  31   direction between 0 to 359 degrees. This effectively allows the
  32   visualization of 3 parameters at each point (x,y,angle). As an
  33   additional bonus there is also possible to define a callback for each
  34   scatter plot to also define the color for each point.</P>
  35  <P> To create a field plot you create an instance of <A href="../ref/FieldPlot.html#_C_FIELDPLOT">
  36  FieldPlot</A> in the same way as you created a normal scatter plot. The
  37   arguments to this method are Y-coordinate, X-coordinate and angle. To
  38   specify a callback you use <A href="../ref/FieldPlot.html#_FIELDPLOT_SETCALLBACK">
  39  FieldPlot::SetCallback()</A></P>
  40  <P> The following example (and code) illustrates the usage of the field
  41   plot type.</P>
  42  <P><DIV class="example">
  43  <BR> <A href="exframes/frame_fieldscatterex1.html" target="blank"><IMG border="0"
  44  HEIGHT="200"  src="img/fieldscatterex1.png" WIDTH="300"></A>
  45  <BR><B>Figure 63:</B> Example of the Field plot type <A href="exframes/frame_fieldscatterex1.html"
  46  target="blank">[src]</A>&nbsp;
  47  <P></P>
  48  </DIV></P>
  49  <P> In addition to the parameters mentioned above you can also adjust
  50   both the general size of the arrow and also the specific size of the
  51   arrowhead. The arrow size is specified in pixels and the arrow head is
  52   specified as an integers between 0 and 10. These sizes are specified
  53   with a call to <A href="../ref/FieldArrow.html#_FIELDARROW_SETSIZE">
  54  FieldPlot::arrow::SetSize()</A></P>
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