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  28  <H2><A NAME="9_10">9.10 Grouping activities</A></H2>
  29  <P> It is common to group activities. We have used this feature in the
  30   examples of constrains. There is no special type for activity bars that
  31   are used to illustrate grouping. The common way of illustrating this
  32   (as have been used above) is to add &quot;half&quot; a triangle marker at both
  33   ends of the bar. The special provision that JpGraph does is that if you
  34   add a left or right marker of type MARK_LEFTTRIANGLE or
  35   MARK_RIGHTTRIANGLE those triangles will be drawn under the bars to give
  36   the effect as show in the examples above. In the example above we also
  37   have made the grouping bars have slightly less heigh since the end
  38   triangles will visually &quot;grow&quot; the bar.</P>
  39  <P> So to get the effect we want for a group bar we have to use the two
  40   lines:<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
  41  &nbsp;$groupbar</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
  42  leftMark</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
  43  SetType</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
  44  &quot;MARK_LEFTTRIANGLE&quot;</FONT><FONT color="#007700">);
  45  <BR></FONT><FONT color="#0000BB">$groupbar</FONT><FONT color="#007700">
  46  -&gt;</FONT><FONT color="#0000BB">rightMark</FONT><FONT color="#007700">-&gt;</FONT><FONT
  47  color="#0000BB">SetType</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
  48  &quot;MARK_RIGHTTRIANGLE&quot;</FONT><FONT color="#007700">)</FONT><FONT color="#0000BB">
  49  </FONT></FONT></CODE></DIV></P>
  50  <P></P>
  51  <P> As of the current version There is not yet any formatting support to
  52   accomplish the effect of indentation for the titles so this is
  53   accomplished by using a fixed width font and adding spaces in front of
  54   the title.</P>
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