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<H3><A NAME="8_1_15">8.1.15 Using accumulated line graphs</A></H3>
<P> Accumulated line graphs are line graphs that are &quot;stacked&quot; on top of
 each other. That is, the values in the supplied data for the Y-axis is
 not the absolute value but rather the relative value from graph below.
 For example if you have two line graphs with three points each, say
 [3,7,5] and [6,9,7]. The first graph will be plotted on the absolute
 Y-values [3,7,5] the second plot will be plotted at [3+6, 7+9, 5+7],
 hence the values of the previous graphs will be used as offsets.</P>
<P> You may add any number of ordinary line graphs together. If you want
 to use three line plots in an accumulated line plot graph you write the
 following code</P>
<P><DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
&nbsp;</FONT><FONT color="#FF8000">//&nbsp;First&nbsp;create&nbsp;the&nbsp;individual&nbsp;plots
<BR></FONT><FONT color="#0000BB">$p1&nbsp;</FONT><FONT color="#007700">=&nbsp;new&nbsp;</FONT><FONT
color="#0000BB">LinePlot</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
$datay_1</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">$p2&nbsp;</FONT><FONT color="#007700">=&nbsp;new&nbsp;</FONT><FONT
color="#0000BB">LinePlot</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
$datay_2</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">$p3&nbsp;</FONT><FONT color="#007700">=&nbsp;new&nbsp;</FONT><FONT
color="#0000BB">LinePlot</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
$datay_3</FONT><FONT color="#007700">);
<BR>
<BR></FONT><FONT color="#FF8000">
//&nbsp;Then&nbsp;add&nbsp;them&nbsp;together&nbsp;to&nbsp;form&nbsp;a&nbsp;accumulated&nbsp;plot
<BR></FONT><FONT color="#0000BB">$ap&nbsp;</FONT><FONT color="#007700">=&nbsp;new&nbsp;</FONT><FONT
color="#0000BB">AccLinePlot</FONT><FONT color="#007700">(array(</FONT><FONT
color="#0000BB">$p1</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
$p2</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">$p3</FONT><FONT
color="#007700">));
<BR>
<BR></FONT><FONT color="#FF8000">
//&nbsp;Add&nbsp;the&nbsp;accumulated&nbsp;line&nbsp;plot&nbsp;to&nbsp;the&nbsp;graph
<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">Add</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
$ap</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT></FONT>
</CODE></DIV></P>
<P> You might of course also fill each line plot by adding the lines<DIV class="phpscript">
<CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$p1</FONT><FONT color="#007700">
-&gt;</FONT><FONT color="#0000BB">SetFillColor</FONT><FONT color="#007700">
(</FONT><FONT color="#DD0000">&quot;red&quot;</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">$p2</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">SetFillColor</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
&quot;blue&quot;</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">$p3</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">SetFillColor</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
&quot;green&quot;</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT>
</FONT></CODE></DIV></P>
<P> Using some appropriate data this might then give a graph perhaps
 like the one showed in the figure below<DIV class="example">
<BR> <A href="exframes/frame_example17.html" target="blank"><IMG border="0"
HEIGHT="200"  src="img/example17.png" WIDTH="300"></A>
<BR><B>Figure 25:</B> Accumulated filled line graph <A href="exframes/frame_example17.html"
target="blank">[src]</A>&nbsp;
<P></P>
</DIV></P>
<P></P>
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