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  28  <H2><A NAME="10_7">10.7 Gantt bars</A></H2>
  29  <P> The most common of all object in a Gantt chart is of course the
  30   activity bar (GanttBar()). In terms of formatting this object has a
  31   very large flexibility. The full signature for the GanttBar constructor
  32   is<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
  33  &nbsp;</FONT><FONT color="#007700">function&nbsp;</FONT><FONT color="#0000BB">
  34  GanttBar</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
  35  $aVPos</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">$aTitle</FONT><FONT
  36  color="#007700">,</FONT><FONT color="#0000BB">$aStart</FONT><FONT color="#007700">
  37  ,</FONT><FONT color="#0000BB">$aEnd</FONT><FONT color="#007700">,</FONT><FONT
  38  color="#0000BB">$aCaption</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
  39  $aHeight</FONT><FONT color="#007700">)</FONT><FONT color="#0000BB"></FONT>
  40  </FONT></CODE></DIV></P>
  41  <P></P>
  42  <P></P>
  43  <TABLE border="0">
  44  <TR><TD valign="top">
  45  <!--span style=&quot;font-family:times;font-size:85%;font-weight:bold;&quot;-->
  46  <CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$aVPos&nbsp;</FONT></FONT>
  47  </CODE></TD><TD valign="top">&nbsp;</TD><TD>The vertical position for the
  48   bar, [0..n]</TD></TR>
  49  <TR><TD valign="top">
  50  <!--span style=&quot;font-family:times;font-size:85%;font-weight:bold;&quot;-->
  51  <CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$aTitle&nbsp;</FONT></FONT>
  52  </CODE></TD><TD valign="top">&nbsp;</TD><TD>Title for the activity</TD></TR>
  53  <TR><TD valign="top">
  54  <!--span style=&quot;font-family:times;font-size:85%;font-weight:bold;&quot;-->
  55  <CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$aStart&nbsp;</FONT></FONT>
  56  </CODE></TD><TD valign="top">&nbsp;</TD><TD>Start date for the activity given
  57   as string, e.g &quot;2001-09-22&quot;</TD></TR>
  58  <TR><TD valign="top">
  59  <!--span style=&quot;font-family:times;font-size:85%;font-weight:bold;&quot;-->
  60  <CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$aEnd&nbsp;</FONT></FONT></CODE>
  61  </TD><TD valign="top">&nbsp;</TD><TD>End date for activity given as<B> either</B>
  62   a date (a string) or as the duration (in days) of the activity, e.g
  63   both &quot;2001-10-15&quot; and 20.5 are valid inputs</TD></TR>
  64  <TR><TD valign="top">
  65  <!--span style=&quot;font-family:times;font-size:85%;font-weight:bold;&quot;-->
  66  <CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$aCaption&nbsp;</FONT></FONT>
  67  </CODE></TD><TD valign="top">&nbsp;</TD><TD>Text string (caption) to appear
  68   at the end (right side) of the bar</TD></TR>
  69  <TR><TD valign="top">
  70  <!--span style=&quot;font-family:times;font-size:85%;font-weight:bold;&quot;-->
  71  <CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$aHeight&nbsp;</FONT></FONT>
  72  </CODE></TD><TD valign="top">&nbsp;</TD><TD>Height of bar given as<B> either</B>
  73   a value in range [0,1] in which case this is interpretated as what
  74   fraction of the vertical position should the bar occupy. The height can
  75   also be given in absolute pixels [1..200]</TD></TR>
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