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