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  28  <H2><A NAME="10_21">10.21 Timing the generation of graphs</A></H2>
  29  <P> During development and optimization it can be very handy to have the
  30   actual time it took to generate the image as a footnote. The following
  31   example shows the usage of this feature<DIV class="example">
  32  <BR> <A href="exframes/frame_example11.html" target="blank"><IMG border="0"
  33  HEIGHT="200"  src="img/example11.png" WIDTH="300"></A>
  34  <BR><B>Figure 178:</B> Timing of a graph <A href="exframes/frame_example11.html"
  35  target="blank">[src]</A>&nbsp;
  36  <P></P>
  37  </DIV></P>
  38  <P> To enable this feature you can proceed in two ways.</P>
  39  <OL>
  40  <LI> You can either set the global define BRAND_TIMING (in jpgraph.php)
  41   to true. This will add the timing string to all graphs generated.</LI>
  42  <LI> .. or you can enable it for a specific graph by setting the global
  43   variable $gJpgBrandTiming as in<DIV class="phpscript"><CODE><FONT color="#000000">
  44   <FONT color="#0000BB">&nbsp;$gJpgBrandTiming</FONT><FONT color="#007700">=</FONT><FONT
  45  color="#0000BB">true</FONT><FONT color="#007700">;</FONT><FONT color="#0000BB">
  46  </FONT></FONT></CODE></DIV>
  47  <P>in the beginning of the script.</P>
  48  </LI>
  49  </OL>
  50  <P> If you like you might also change the way the timing is formatted by
  51   setting the string defined by BRAND_TIMING_FORMAT (in jpgraph.php).
  52   This string represents a standard printf() format string.<DIV class="note">
  53  <B>Note:</B> JpGraph contains a utility class called JpgTimer which you
  54   can use yourself should you need ms timing of part of your own code.
  55   The API is really simple. The class supports multiple running timers
  56   and you start a timer simply by calling the Push() method. This will
  57   start a new timer and put it on the top of the timer stack. To stop the
  58   timer, pop it from the stack and return the timing value simply call
  59   Pop().</DIV></P>
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