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<H2><A NAME="7_18">7.18 Rotating graphs 90 degrees</A></H2>
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<P> In section <A href="7adv.html#10_2">10.2</A> you can read about
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arbitrary rotation of the graphs. For most practical purposes rotation
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of 90 degrees is most useful. This could for example be used to plot
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horizontal bar graphs.</P>
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<P> The slight complication with general rotation is that the margins
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also rotates, this means that if you rotate a graph 90 degrees the left
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margin in the image was originally the bottom margin. In additional by
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default the center of the rotation is the center of the plot area and
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not the entire image (if all the margins are symmetrical then they will
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of course coincide). This means that depending on your margin the
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center of the rotation will move. You can read more about this and how
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to manually set the center for rotation in the section about rotation, <A
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href="7adv.html#10_2">10.2</A></P>
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<P> This is just a slight inconvenience which you have to take into
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account when you need to set an explicit margin with a call to <A href="../ref/Graph.html#_GRAPH_SETMARGIN">
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Graph::SetMargin()</A></P>
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<P> However, in order to make a rotation of 90 degrees much easier you
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can easily rotate a graph 90 degrees and set the correct margin with a
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call to <A href="../ref/Graph.html#_GRAPH_SET90ANDMARGIN">
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Graph::Set90AndMargin()</A> The parameter to this method lets you
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specify the margins as you will see them in the image without having to
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think of what becomes what after the rotation.</P>
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<P> So, the only thing you need to do is call this method and then the
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graph will have been rotated 90 degrees.</P>
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