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  28  <H3><A NAME="7_1_15">7.1.15 Using accumulated line graphs</A></H3>
  29  <P> Accumulated line graphs are line graphs that are &quot;stacked&quot; on top of
  30   each other. That is, the values in the supplied data for the Y-axis is
  31   not the absolute value but rather the relative value from graph below.
  32   For example if you have two line graphs with three points each, say
  33   [3,7,5] and [6,9,7]. The first graph will be plotted on the absolute
  34   Y-values [3,7,5] the second plot will be plotted at [3+6, 7+9, 5+7],
  35   hence the values of the previous graphs will be used as offsets.</P>
  36  <P> You may add any number of ordinary line graphs together. If you want
  37   to use three line plots in an accumulated line plot graph you write the
  38   following code</P>
  39  <P><DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
  40  &nbsp;</FONT><FONT color="#FF8000">//&nbsp;First&nbsp;create&nbsp;the&nbsp;individual&nbsp;plots
  41  <BR></FONT><FONT color="#0000BB">$p1&nbsp;</FONT><FONT color="#007700">=&nbsp;new&nbsp;</FONT><FONT
  42  color="#0000BB">LinePlot</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
  43  $datay_1</FONT><FONT color="#007700">);
  44  <BR></FONT><FONT color="#0000BB">$p2&nbsp;</FONT><FONT color="#007700">=&nbsp;new&nbsp;</FONT><FONT
  45  color="#0000BB">LinePlot</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
  46  $datay_2</FONT><FONT color="#007700">);
  47  <BR></FONT><FONT color="#0000BB">$p3&nbsp;</FONT><FONT color="#007700">=&nbsp;new&nbsp;</FONT><FONT
  48  color="#0000BB">LinePlot</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
  49  $datay_3</FONT><FONT color="#007700">);
  50  <BR>
  51  <BR></FONT><FONT color="#FF8000">
  52  //&nbsp;Then&nbsp;add&nbsp;them&nbsp;together&nbsp;to&nbsp;form&nbsp;a&nbsp;accumulated&nbsp;plot
  53  <BR></FONT><FONT color="#0000BB">$ap&nbsp;</FONT><FONT color="#007700">=&nbsp;new&nbsp;</FONT><FONT
  54  color="#0000BB">AccLinePlot</FONT><FONT color="#007700">(array(</FONT><FONT
  55  color="#0000BB">$p1</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
  56  $p2</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">$p3</FONT><FONT
  57  color="#007700">));
  58  <BR>
  59  <BR></FONT><FONT color="#FF8000">
  60  //&nbsp;Add&nbsp;the&nbsp;accumulated&nbsp;line&nbsp;plot&nbsp;to&nbsp;the&nbsp;graph
  61  <BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
  62  color="#0000BB">Add</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
  63  $ap</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT></FONT>
  64  </CODE></DIV></P>
  65  <P> You might of course also fill each line plot by adding the lines<DIV class="phpscript">
  66  <CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$p1</FONT><FONT color="#007700">
  67  -&gt;</FONT><FONT color="#0000BB">SetFillColor</FONT><FONT color="#007700">
  68  (</FONT><FONT color="#DD0000">&quot;red&quot;</FONT><FONT color="#007700">);
  69  <BR></FONT><FONT color="#0000BB">$p2</FONT><FONT color="#007700">-&gt;</FONT><FONT
  70  color="#0000BB">SetFillColor</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
  71  &quot;blue&quot;</FONT><FONT color="#007700">);
  72  <BR></FONT><FONT color="#0000BB">$p3</FONT><FONT color="#007700">-&gt;</FONT><FONT
  73  color="#0000BB">SetFillColor</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
  74  &quot;green&quot;</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT>
  75  </FONT></CODE></DIV></P>
  76  <P> Using some appropriate data this might then give a graph perhaps
  77   like the one showed in the figure below<DIV class="example">
  78  <BR> <A href="exframes/frame_example17.html" target="blank"><IMG border="0"
  79  HEIGHT="200"       src="img/img/img/img/img/img/example17.png" WIDTH="300"></A>
  80  <BR><B>Figure 27:</B> Accumulated filled line graph <A href="exframes/frame_example17.html"
  81  target="blank">[src]</A>&nbsp;
  82  <P></P>
  83  </DIV></P>
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