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  28  <H2><A NAME="9_6">9.6 Positioning objects in the Gantt plot</A></H2>
  29  <P> Bars and Milestones need both a vertical position and a horizontal
  30   position. The horizontal start position is specified as a date, e.g.
  31   &quot;2001-06-23&quot;, and the vertical positions are specified as a number
  32   [0,1,2,3,...]. This vertical number indicates the position from the top
  33   where the object should be placed. To understand this you might imagine
  34   a number of &quot;invisible&quot; horizontal bands with a certain height. If you
  35   specify 0 as the vertical position the bar will be placed in the first
  36   band, specify 3 and the bar will be placed in the fourth band and so
  37   on.</P>
  38  <P> It is perfectly legal, and perhaps even desirable to leave &quot;gaps&quot;
  39   when laying out bands to group related activities. So, for example you
  40   could have three activities/bars at positions 1,2,3 and then another 2
  41   bars at position 6,7 leaving band 0,4,5 empty.</P>
  42  <P> All these &quot;invisible bands&quot; have the same height (equ-spaced). The
  43   height of each band is automatically determined and depends on both the
  44   method of layout ( as specified by (GanttChart::SetLayout()) and the
  45   individual heights of the individual bars and titles. The rules are
  46   quite simple:</P>
  47  <UL>
  48  <LI> If you use layout=GANTT_FROMTOP (the default and most common) the
  49   height will equal the height (+ a margin) of the highest gantt bar. The
  50   height calculation of each bar takes into account both the actual bar,
  51   the title, and any left- right-marks (more about that later) that may
  52   be present. The name &quot;fromtop&quot; refers to that when you have explicitly
  53   specified a height the bars will usually be added from band 0 and
  54   onwards and hence being added from the top. (This might leave empty
  55   space at the bottom of the plot area in the graph if the height of the
  56   graph has been explicitly specified).</LI>
  57  <LI> If you use layout=GANTT_EVEN the bars are evenly (hence the name)
  58   spread out over the available height in the gantt chart and no
  59   consideration is taken of the individual bars heights. Note that if you
  60   use automatic sizing you cant use even layout. It just doesn't make
  61   sense. Even layout is for those cases when you deliberately specify a
  62   very large image and want the bars evenly distributed using the full
  63   height.</LI>
  64  </UL>
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