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  28  <H3><A NAME="9_3_3">9.3.3 Adjusting the grid lines</A></H3>
  29  <P> As usual you have full freedom to select what grid lines you like to
  30   show (and what colors they should have). There are three different
  31   types of grid lines you may adjust. The radius minor and major grid
  32   lines and the angle grid lines.</P>
  33  <P> You select what grid lines to show with a call to <A href="../ref/PolarAxis.html#_POLARAXIS_SHOWGRID">
  34  PolarAxis::ShowGrid()</A> The two example below shows a logarithmic plot
  35   with either just major grid lines or both minor and major grid lines.</P>
  36  <P><DIV class="example">
  37  <BR> <A href="exframes/frame_polarex4.html" target="blank"><IMG border="0"
  38  HEIGHT="350"  src="img/polarex4.png" WIDTH="300"></A>
  39  <BR><B>Figure 139:</B> Using a logarithmic scale with just major
  40   gridlines <A href="exframes/frame_polarex4.html" target="blank">[src]</A>
  41  &nbsp;
  42  <P></P>
  43  </DIV></P>
  44  <P></P>
  45  <P><DIV class="example">
  46  <BR> <A href="exframes/frame_polarex5.html" target="blank"><IMG border="0"
  47  HEIGHT="350"  src="img/polarex5.png" WIDTH="300"></A>
  48  <BR><B>Figure 140:</B> Using a logarithmic scale with both minor and
  49   major gridlines <A href="exframes/frame_polarex5.html" target="blank">
  50  [src]</A>&nbsp;
  51  <P></P>
  52  </DIV></P>
  53  <P> The colors of the grid lines are specified with a call to <A href="../ref/PolarAxis.html#_POLARAXIS_SETGRIDCOLOR">
  54   PolarAxis::SetGridColor()</A></P>
  55  <P> For the angle grid lines it is possible to specify the angle
  56   division between each grid line with the method <A href="../ref/PolarAxis.html#_POLARAXIS_SETANGLESTEP">
  57   PolarAxis::SetAngleStep()</A> You specify the step distance in degrees.
  58   By default the step size is 15 degrees.</P>
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