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<HR NOSHADE>
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<H2><A NAME="2_7">2.7 Acknowledgments</A></H2>
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<P> The idea for writing this library grew out of our own need for a
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high quality graph drawing library for PHP. When evaluating potential
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existing libraries we found (at that time around 2000) these three</P>
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<OL>
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<LI> "chart 0.3" http://quimby.gnus.org/circus/chart/chart-0.3.tar.gz,
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by Lars Magne Ingebrigtsen</LI>
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<LI> "ykcee.php", http://ykcee.sourceforge.net</LI>
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<LI> "phplot.php", http://www.phplot.com</LI>
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</OL>
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<P> All these libraries implements some fine graphic features but
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unfortunately none of those completely fulfilled our needs either for
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available functionality (for example none of these supported both two
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Y-scales, auto-scaling, and logarithmic scales), or general
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flexibility. We especially needed the option of two Y-scales, which
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none of the above packages supported. Our own preferences for design
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was closest to "chart 0.3" so we started by fixing some bugs in that
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package and adding some new features. However It was soon realized that
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to add all the features and flexibility we needed to "chart 0.3" it
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would require a complete rewrite since the original design wasn't
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flexible enough, especially adding a second Y-scale would require a
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more flexible OO architecture.</P>
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