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