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  28  <H2><A NAME="9_4">9.4  The structure of a Gantt chart</A></H2>
  29  <P> A Gantt chart is made up of four distinct areas.</P>
  30  <OL>
  31  <LI>On the left side there is the activity title column.</LI>
  32  <LI>On the top there is the scale headers (up to four headers may be
  33   displayed)</LI>
  34  <LI>The actual plot area where all the Gantt bars and markers go</LI>
  35  <LI>The margin area, where for example the titles are shown</LI>
  36  </OL>
  37  <P> Since a Gantt chart inherits all the usual properties of a JpGraph
  38   Graph() you have the access to the same method to formatting the image
  39   as before. For example to have a shadow around the image you call
  40   Graph::SetShadow() and to set the margin color you can use
  41   Graph::SetMarginColor(). Please refer to the reference documentation
  42   for a full list of supported features.</P>
  43  <P> To create a Gantt chart you<STRONG> add</STRONG> objects to it. As
  44   of this writing you may add the following object by the use of the
  45   GanttChart::Add() method</P>
  46  <UL>
  47  <LI> Gantt bars (indicates the length of an activity)</LI>
  48  <LI> Milestones, a single mark at a specific date</LI>
  49  <LI> Vertical line, might be use to mark phases in projects</LI>
  50  </UL>
  51  <P> All these objects may be extensively modified in terms of
  52   formatting. You can specify color (both fill- and frame color), size,
  53   titles, style and patterns and so on. All these objects comes with (in
  54   my mind) sensible default so you don't have to specify a lot of
  55   parameters. But if you need a fine grain control or if you disagree
  56   with my taste you<STRONG> can</STRONG>.</P>
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