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    <p>In the pChart examples, see the page [Examples > Area Chart > drawAreaChart.threshold]. <img src="https://i.stack.imgur.com/4RE1S.png" alt="Screenshot of pGraph documentation example for drawAreaChart with threshold coloring"> This does colorizes parts of an area (in area graphs) if they are inside a threshold you configure. </p> <p>Code snippet from that example:</p> <pre><code>/* Draw the area chart */ $Threshold = ""; $Threshold[] = array("Min"=&gt;0,"Max"=&gt;5,"R"=&gt;187,"G"=&gt;220,"B"=&gt;0,"Alpha"=&gt;100); $Threshold[] = array("Min"=&gt;5,"Max"=&gt;10,"R"=&gt;240,"G"=&gt;132,"B"=&gt;20,"Alpha"=&gt;100); $Threshold[] = array("Min"=&gt;10,"Max"=&gt;20,"R"=&gt;240,"G"=&gt;91,"B"=&gt;20,"Alpha"=&gt;100); $myPicture-&gt;setShadow(TRUE,array("X"=&gt;1,"Y"=&gt;1,"R"=&gt;0,"G"=&gt;0,"B"=&gt;0,"Alpha"=&gt;20)); $myPicture-&gt;drawAreaChart(array("Threshold"=&gt;$Threshold)); </code></pre> <p>This coloring above/below thresholds is possible in area graphs. I doubt this works for line graphs, but its worth a try..</p> <p>Its also possible to indicate thresholds with a horizontal line, also from this example:</p> <pre><code>/* Write the thresholds */ $myPicture-&gt;drawThreshold(5,array("WriteCaption"=&gt;TRUE,"Caption"=&gt;"Warn Zone","Alpha"=&gt;70,"Ticks"=&gt;2,"R"=&gt;0,"G"=&gt;0,"B"=&gt;255)); $myPicture-&gt;drawThreshold(10,array("WriteCaption"=&gt;TRUE,"Caption"=&gt;"Error Zone","Alpha"=&gt;70,"Ticks"=&gt;2,"R"=&gt;0,"G"=&gt;0,"B"=&gt;255)); </code></pre> <p>This threshold dotted line is supported in line (so non-area) graphs by the way.</p>
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