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  28  <H2><A NAME="8_18">8.18 Rotating graphs 90 degrees</A></H2>
  29  <P> In section <A href="7adv.html#10_2">10.2</A> you can read about
  30   arbitrary rotation of the graphs. For most practical purposes rotation
  31   of 90 degrees is most useful. This could for example be used to plot
  32   horizontal bar graphs.</P>
  33  <P> The slight complication with general rotation is that the margins
  34   also rotates, this means that if you rotate a graph 90 degrees the left
  35   margin in the image was originally the bottom margin. In additional by
  36   default the center of the rotation is the center of the plot area and
  37   not the entire image (if all the margins are symmetrical then they will
  38   of course coincide). This means that depending on your margin the
  39   center of the rotation will move. You can read more about this and how
  40   to manually set the center for rotation in the section about rotation, <A
  41  href="7adv.html#10_2">10.2</A></P>
  42  <P> This is just a slight inconvenience which you have to take into
  43   account when you need to set an explicit margin with a call to <A href="../ref/Graph.html#_GRAPH_SETMARGIN">
  44  Graph::SetMargin()</A></P>
  45  <P> However, in order to make a rotation of 90 degrees much easier you
  46   can easily rotate a graph 90 degrees and set the correct margin with a
  47   call to <A href="../ref/Graph.html#_GRAPH_SET90ANDMARGIN">
  48  Graph::Set90AndMargin()</A> The parameter to this method lets you
  49   specify the margins as you will see them in the image without having to
  50   think of what becomes what after the rotation.</P>
  51  <P> So, the only thing you need to do is call this method and then the
  52   graph will have been rotated 90 degrees.</P>
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