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<H2><A NAME="10_4">10.4  The structure of a Gantt chart</A></H2>
<P> A Gantt chart is made up of four distinct areas.</P>
<OL>
<LI>On the left side there is the activity title column.</LI>
<LI>On the top there is the scale headers (up to four headers may be
 displayed)</LI>
<LI>The actual plot area where all the Gantt bars and markers go</LI>
<LI>The margin area, where for example the titles are shown</LI>
</OL>
<P> Since a Gantt chart inherits all the usual properties of a JpGraph
 Graph() you have the access to the same method to formatting the image
 as before. For example to have a shadow around the image you call
 Graph::SetShadow() and to set the margin color you can use
 Graph::SetMarginColor(). Please refer to the reference documentation
 for a full list of supported features.</P>
<P> To create a Gantt chart you<STRONG> add</STRONG> objects to it. As
 of this writing you may add the following object by the use of the
 GanttChart::Add() method</P>
<UL>
<LI> Gantt bars (indicates the length of an activity)</LI>
<LI> Milestones, a single mark at a specific date</LI>
<LI> Vertical line, might be use to mark phases in projects</LI>
</UL>
<P> All these objects may be extensively modified in terms of
 formatting. You can specify color (both fill- and frame color), size,
 titles, style and patterns and so on. All these objects comes with (in
 my mind) sensible default so you don't have to specify a lot of
 parameters. But if you need a fine grain control or if you disagree
 with my taste you<STRONG> can</STRONG>.</P>
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