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  28  <H3><A NAME="10_7_6">10.7.6 Adjusting the minimum distance between bars</A>
  29  </H3>
  30  <P> Let's see what happens if we set the height of each bar to be 100%
  31   of the reserved height by adding another activity/bar below the first
  32   one and set the height of each bar to 100% by adding the lines (We omit
  33   the added lines to add another bar since they are just a copy of the
  34   first bar)<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
  35  &nbsp;$activity</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
  36  SetHeight</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">1.0</FONT><FONT
  37  color="#007700">);
  38  <BR></FONT><FONT color="#0000BB">$activity2</FONT><FONT color="#007700">
  39  -&gt;</FONT><FONT color="#0000BB">SetHeight</FONT><FONT color="#007700">(</FONT><FONT
  40  color="#0000BB">1.0</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB">
  41  </FONT></FONT></CODE></DIV></P>
  42  <P> to the previous example. (Note that a value in the range [0..1] is
  43   interpretated as the fraction of the reserved height while a value &gt; 1
  44   is interpretated as the absolute size in pixels.)<DIV class="example">
  45  <BR> <A href="exframes/frame_ganttex10.html" target="blank"><IMG border="0"
  46  HEIGHT="243"  src="img/ganttex10.png" WIDTH="502"></A>
  47  <BR><B>Figure 153:</B> Setting the height for each bar to 100% <A href="exframes/frame_ganttex10.html"
  48  target="blank">[src]</A>&nbsp;
  49  <P></P>
  50  </DIV></P>
  51  <P> Aha.. What we are trying to do doesn't really make sense. Since we
  52   have specified that the bar will always occupy 100% of the available
  53   reserved with there will be no distance between the bars. So what if we
  54   specify the bar as 10 pixel absolute by changing the lines to<DIV class="phpscript">
  55  <CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$activity</FONT><FONT
  56  color="#007700">-&gt;</FONT><FONT color="#0000BB">SetHeight</FONT><FONT color="#007700">
  57  (</FONT><FONT color="#0000BB">10</FONT><FONT color="#007700">);
  58  <BR></FONT><FONT color="#0000BB">$activity2</FONT><FONT color="#007700">
  59  -&gt;</FONT><FONT color="#0000BB">SetHeight</FONT><FONT color="#007700">(</FONT><FONT
  60  color="#0000BB">10</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB">
  61  </FONT></FONT></CODE></DIV></P>
  62  <P> we instead get<DIV class="example">
  63  <BR> <A href="exframes/frame_ganttex11.html" target="blank"><IMG border="0"
  64  HEIGHT="243"  src="img/ganttex11.png" WIDTH="502"></A>
  65  <BR><B>Figure 154:</B> Setting both bars height to 10 pixels <A href="exframes/frame_ganttex11.html"
  66  target="blank">[src]</A>&nbsp;
  67  <P></P>
  68  </DIV></P>
  69  <P> So what can we actually do? Well if you remember the reserved height
  70   for each bar is the maximum height of all bars including titles. This
  71   guarantees that no two bars will ever overlap. To guarantee that titles
  72   don't end up too close together there is a<B> Vertical Label Margin</B>
  73   which basically specifies some extra &quot;air&quot; in between the titles. The
  74   amount of air is specified in percent of the title height. To set the
  75   margin you use<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
  76  &nbsp;GanttGraph</FONT><FONT color="#007700">::</FONT><FONT color="#0000BB">
  77  SetLabelVMarginFactor</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
  78  $aMargin</FONT><FONT color="#007700">)</FONT><FONT color="#0000BB"></FONT>
  79  </FONT></CODE></DIV></P>
  80  <P> As an example let's set that margin in the previous example to 0 and
  81   see what happens.<DIV class="example">
  82  <BR> <A href="exframes/frame_ganttex12.html" target="blank"><IMG border="0"
  83  HEIGHT="212"  src="img/ganttex12.png" WIDTH="502"></A>
  84  <BR><B>Figure 155:</B> Setting the vertical label margin to 0% <A href="exframes/frame_ganttex12.html"
  85  target="blank">[src]</A>&nbsp;
  86  <P></P>
  87  </DIV></P>
  88  <P> As you would perhaps expect the two bars just barely touches now
  89   since there are no extra margin added. If the two bars hadn't had the
  90   extra right marker it would have looked very compressed.</P>
  91  <P> By default the vertical margin is set to 40%.</P>
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