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<H3><A NAME="10_7_6">10.7.6 Adjusting the minimum distance between bars</A>
</H3>
<P> Let's see what happens if we set the height of each bar to be 100%
 of the reserved height by adding another activity/bar below the first
 one and set the height of each bar to 100% by adding the lines (We omit
 the added lines to add another bar since they are just a copy of the
 first bar)<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
&nbsp;$activity</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
SetHeight</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">1.0</FONT><FONT
color="#007700">);
<BR></FONT><FONT color="#0000BB">$activity2</FONT><FONT color="#007700">
-&gt;</FONT><FONT color="#0000BB">SetHeight</FONT><FONT color="#007700">(</FONT><FONT
color="#0000BB">1.0</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB">
</FONT></FONT></CODE></DIV></P>
<P> to the previous example. (Note that a value in the range [0..1] is
 interpretated as the fraction of the reserved height while a value &gt; 1
 is interpretated as the absolute size in pixels.)<DIV class="example">
<BR> <A href="exframes/frame_ganttex10.html" target="blank"><IMG border="0"
HEIGHT="243"  src="img/ganttex10.png" WIDTH="502"></A>
<BR><B>Figure 153:</B> Setting the height for each bar to 100% <A href="exframes/frame_ganttex10.html"
target="blank">[src]</A>&nbsp;
<P></P>
</DIV></P>
<P> Aha.. What we are trying to do doesn't really make sense. Since we
 have specified that the bar will always occupy 100% of the available
 reserved with there will be no distance between the bars. So what if we
 specify the bar as 10 pixel absolute by changing the lines to<DIV class="phpscript">
<CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$activity</FONT><FONT
color="#007700">-&gt;</FONT><FONT color="#0000BB">SetHeight</FONT><FONT color="#007700">
(</FONT><FONT color="#0000BB">10</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">$activity2</FONT><FONT color="#007700">
-&gt;</FONT><FONT color="#0000BB">SetHeight</FONT><FONT color="#007700">(</FONT><FONT
color="#0000BB">10</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB">
</FONT></FONT></CODE></DIV></P>
<P> we instead get<DIV class="example">
<BR> <A href="exframes/frame_ganttex11.html" target="blank"><IMG border="0"
HEIGHT="243"  src="img/ganttex11.png" WIDTH="502"></A>
<BR><B>Figure 154:</B> Setting both bars height to 10 pixels <A href="exframes/frame_ganttex11.html"
target="blank">[src]</A>&nbsp;
<P></P>
</DIV></P>
<P> So what can we actually do? Well if you remember the reserved height
 for each bar is the maximum height of all bars including titles. This
 guarantees that no two bars will ever overlap. To guarantee that titles
 don't end up too close together there is a<B> Vertical Label Margin</B>
 which basically specifies some extra &quot;air&quot; in between the titles. The
 amount of air is specified in percent of the title height. To set the
 margin you use<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
&nbsp;GanttGraph</FONT><FONT color="#007700">::</FONT><FONT color="#0000BB">
SetLabelVMarginFactor</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
$aMargin</FONT><FONT color="#007700">)</FONT><FONT color="#0000BB"></FONT>
</FONT></CODE></DIV></P>
<P> As an example let's set that margin in the previous example to 0 and
 see what happens.<DIV class="example">
<BR> <A href="exframes/frame_ganttex12.html" target="blank"><IMG border="0"
HEIGHT="212"  src="img/ganttex12.png" WIDTH="502"></A>
<BR><B>Figure 155:</B> Setting the vertical label margin to 0% <A href="exframes/frame_ganttex12.html"
target="blank">[src]</A>&nbsp;
<P></P>
</DIV></P>
<P> As you would perhaps expect the two bars just barely touches now
 since there are no extra margin added. If the two bars hadn't had the
 extra right marker it would have looked very compressed.</P>
<P> By default the vertical margin is set to 40%.</P>
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