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<H3><A NAME="9_7_6">9.7.6 Adjusting the minimum distance between bars</A>
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</H3>
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<P> Let's see what happens if we set the height of each bar to be 100%
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 of the reserved height by adding another activity/bar below the first
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 one and set the height of each bar to 100% by adding the lines (We omit
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 the added lines to add another bar since they are just a copy of the
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 first bar)<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
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&nbsp;$activity</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
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SetHeight</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">1.0</FONT><FONT
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color="#007700">);
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<BR></FONT><FONT color="#0000BB">$activity2</FONT><FONT color="#007700">
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-&gt;</FONT><FONT color="#0000BB">SetHeight</FONT><FONT color="#007700">(</FONT><FONT
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color="#0000BB">1.0</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB">
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</FONT></FONT></CODE></DIV></P>
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<P> to the previous example. (Note that a value in the range [0..1] is
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 interpretated as the fraction of the reserved height while a value &gt; 1
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 is interpretated as the absolute size in pixels.)<DIV class="example">
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<BR> <A href="exframes/frame_ganttex10.html" target="blank"><IMG border="0"
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HEIGHT="243"       src="img/img/img/img/img/img/ganttex10.png" WIDTH="502"></A>
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<BR><B>Figure 157:</B> Setting the height for each bar to 100% <A href="exframes/frame_ganttex10.html"
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target="blank">[src]</A>&nbsp;
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<P></P>
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</DIV></P>
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<P> Aha.. What we are trying to do doesn't really make sense. Since we
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 have specified that the bar will always occupy 100% of the available
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 reserved with there will be no distance between the bars. So what if we
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 specify the bar as 10 pixel absolute by changing the lines to<DIV class="phpscript">
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<CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$activity</FONT><FONT
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color="#007700">-&gt;</FONT><FONT color="#0000BB">SetHeight</FONT><FONT color="#007700">
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(</FONT><FONT color="#0000BB">10</FONT><FONT color="#007700">);
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<BR></FONT><FONT color="#0000BB">$activity2</FONT><FONT color="#007700">
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-&gt;</FONT><FONT color="#0000BB">SetHeight</FONT><FONT color="#007700">(</FONT><FONT
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color="#0000BB">10</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB">
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</FONT></FONT></CODE></DIV></P>
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<P> we instead get<DIV class="example">
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<BR> <A href="exframes/frame_ganttex11.html" target="blank"><IMG border="0"
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HEIGHT="243"       src="img/img/img/img/img/img/ganttex11.png" WIDTH="502"></A>
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<BR><B>Figure 158:</B> Setting both bars height to 10 pixels <A href="exframes/frame_ganttex11.html"
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target="blank">[src]</A>&nbsp;
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<P></P>
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</DIV></P>
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<P> So what can we actually do? Well if you remember the reserved height
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 for each bar is the maximum height of all bars including titles. This
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 guarantees that no two bars will ever overlap. To guarantee that titles
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 don't end up too close together there is a<B> Vertical Label Margin</B>
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 which basically specifies some extra &quot;air&quot; in between the titles. The
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 amount of air is specified in percent of the title height. To set the
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 margin you use<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
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&nbsp;GanttGraph</FONT><FONT color="#007700">::</FONT><FONT color="#0000BB">
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SetLabelVMarginFactor</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
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$aMargin</FONT><FONT color="#007700">)</FONT><FONT color="#0000BB"></FONT>
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</FONT></CODE></DIV></P>
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<P> As an example let's set that margin in the previous example to 0 and
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 see what happens.<DIV class="example">
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<BR> <A href="exframes/frame_ganttex12.html" target="blank"><IMG border="0"
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HEIGHT="212"       src="img/img/img/img/img/img/ganttex12.png" WIDTH="502"></A>
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<BR><B>Figure 159:</B> Setting the vertical label margin to 0% <A href="exframes/frame_ganttex12.html"
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target="blank">[src]</A>&nbsp;
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<P></P>
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</DIV></P>
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<P> As you would perhaps expect the two bars just barely touches now
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 since there are no extra margin added. If the two bars hadn't had the
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 extra right marker it would have looked very compressed.</P>
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<P> By default the vertical margin is set to 40%.</P>
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