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