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<H3><A NAME="7_19_5">7.19.5 Inverting the Y-axis</A></H3>
<P> One good way of illustrate the usefulness of label callbacks in a
 slightly different context is to show how we can achieve the effect of
 an inverted Y-scale.</P>
<P> An inverted Y-scale has the lowest number at the top and the scale
 values increases downwards.</P>
<P> Even though JpGraph doesn't directly support this feature it is
 quite easy to achieve with just a few extra lines of code in your image
 script.</P>
<P> Before we continue we give an example of what we are referring to.</P>
<P><DIV class="example">
<BR> <A href="exframes/frame_inyaxisex2.html" target="blank"><IMG border="0"
HEIGHT="300"       src="img/img/img/img/img/img/inyaxisex2.png" WIDTH="400"></A>
<BR><B>Figure 99:</B> Inverted Y-axis <A href="exframes/frame_inyaxisex2.html"
target="blank">[src]</A>&nbsp;
<P></P>
</DIV></P>
<P></P>
<P> Two achieve this effect there are two simple steps to take:</P>
<OL>
<LI> Negate all you Y-value in the data</LI>
<LI> Create a callback that negates the scale labels so they appear to
 be positive.</LI>
</OL>
<P> And that's it! We refer you to the code in the example above for the
 details.</P>
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