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<A HREF="toc.html">Contents</A>
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<A HREF="7194Formattingthescalelabels.html">Previous</A>
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<HR NOSHADE>
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<H3><A NAME="7_19_5">7.19.5 Inverting the Y-axis</A></H3>
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<P> One good way of illustrate the usefulness of label callbacks in a
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slightly different context is to show how we can achieve the effect of
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an inverted Y-scale.</P>
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<P> An inverted Y-scale has the lowest number at the top and the scale
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values increases downwards.</P>
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<P> Even though JpGraph doesn't directly support this feature it is
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quite easy to achieve with just a few extra lines of code in your image
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script.</P>
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<P> Before we continue we give an example of what we are referring to.</P>
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<P><DIV class="example">
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<BR> <A href="exframes/frame_inyaxisex2.html" target="blank"><IMG border="0"
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HEIGHT="300" src="img/img/img/img/img/img/inyaxisex2.png" WIDTH="400"></A>
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<BR><B>Figure 99:</B> Inverted Y-axis <A href="exframes/frame_inyaxisex2.html"
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target="blank">[src]</A>
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<P></P>
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</DIV></P>
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<P></P>
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<P> Two achieve this effect there are two simple steps to take:</P>
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<OL>
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<LI> Negate all you Y-value in the data</LI>
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<LI> Create a callback that negates the scale labels so they appear to
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be positive.</LI>
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</OL>
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<P> And that's it! We refer you to the code in the example above for the
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details.</P>
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<A HREF="7194Formattingthescalelabels.html">Previous</A>
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<A HREF="720Adjustingtheautoscalinglimitsgracevalue.html">Next</A>
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