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  28  <H3><A NAME="10_12_4">10.12.4 Horizontal grids and alternating line
  29   colors</A></H3>
  30  <P> In order to make large charts easier to read it is possible to
  31   specify alternating an horizontal grid and optional alternating line
  32   colors in the background for Gantt charts. The horizontal grid is
  33   accessed through the<I> Graph::hgrid</I> property and the line (used in
  34   the grid) is accessed through the<I> Graph::hgrid::line</I>
  35   sub-property</P>
  36  <P> In order to specify the alternating line colors the<I>
  37   SetRowFillColor()</I> method is used. For example, to use alternating
  38   blue background with blue grid line the following lines would have to
  39   be added to the graph script<DIV class="phpscript"><CODE><FONT color="#000000">
  40   <FONT color="#0000BB">&nbsp;</FONT><FONT color="#FF8000">
  41  //&nbsp;Setup&nbsp;a&nbsp;horizontal&nbsp;grid
  42  <BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
  43  color="#0000BB">hgrid</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
  44  Show</FONT><FONT color="#007700">();
  45  <BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
  46  color="#0000BB">hgrid</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
  47  line</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">SetColor</FONT><FONT
  48  color="#007700">(</FONT><FONT color="#DD0000">'lightblue'</FONT><FONT color="#007700">
  49  );
  50  <BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
  51  color="#0000BB">hgrid</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
  52  SetRowFillColor</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
  53  'darkblue@0.9'</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB">
  54  </FONT></FONT></CODE></DIV></P>
  55  <P> Below is an example of a Gantt graph using this formatting<DIV class="example">
  56  <BR> <A href="exframes/frame_gantthgridex1.html" target="blank"><IMG border="0"
  57  HEIGHT="253"  src="img/gantthgridex1.png" WIDTH="500"></A>
  58  <BR><B>Figure 165:</B> Adding a horizontal grid to the graph <A href="exframes/frame_gantthgridex1.html"
  59  target="blank">[src]</A>&nbsp;
  60  <P></P>
  61  </DIV></P>
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