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  28  <H3><A NAME="9_2_1">9.2.1 Adding guide lines to Pie Plots</A></H3>
  29  <P> For very busy Pie plots it can become too little space for the
  30   labels to be printed just beside the pie slice. For this purpose it is
  31   possible to use guide lines for the labels. The library will then draw
  32   a line from the center edge of the slices to the label which will be
  33   positioned further out from the Pie Plot.</P>
  34  <P> There is one method that is primarily used to handle this,<I>
  35   PiePlot::SetGuideLines()</I> the simplest usage of this would be<DIV class="phpscript">
  36  <CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$pieplot</FONT><FONT color="#007700">
  37  -&gt;</FONT><FONT color="#0000BB">SetGuideLines</FONT><FONT color="#007700">
  38  ();</FONT><FONT color="#0000BB"></FONT></FONT></CODE></DIV></P>
  39  <P> An example of this could then be<DIV class="example">
  40  <BR> <A href="exframes/frame_pielabelsex1.html" target="blank"><IMG border="0"
  41  HEIGHT="350"  src="img/pielabelsex1.png" WIDTH="300"></A>
  42  <BR><B>Figure 120:</B> Using guide lines for PiePlots <A href="exframes/frame_pielabelsex1.html"
  43  target="blank">[src]</A>&nbsp;
  44  <P></P>
  45  </DIV></P>
  46  <P> The above example will give guide lines very similar as what is
  47   produced by other programs, e.g. Excel. In addition to the above
  48   variant it is also possible to instruct the library to line up the
  49   labels vertically in a way that we think is easier to read. This is
  50   achieved by specifying the second parameter to the SetGuideLines() to<I>
  51   'false'</I> as in<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT
  52  color="#0000BB">&nbsp;$pieplot</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
  53  SetGuideLines</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
  54  true</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">false</FONT><FONT
  55  color="#007700">);</FONT><FONT color="#0000BB"></FONT></FONT></CODE></DIV>
  56  </P>
  57  <P> The first parameter is to enable/disable the guide-lines. With the
  58   same example as above this would then produce the image<DIV class="example">
  59  <BR> <A href="exframes/frame_pielabelsex2.html" target="blank"><IMG border="0"
  60  HEIGHT="350"  src="img/pielabelsex2.png" WIDTH="300"></A>
  61  <BR><B>Figure 121:</B> Using guide lines for PiePlots with vertically
  62   lined up labels. <A href="exframes/frame_pielabelsex2.html" target="blank">
  63  [src]</A>&nbsp;
  64  <P></P>
  65  </DIV></P>
  66  <P> It is also possible to configure the vertical distance between the
  67   labels. By default the distance between the labels is roughly 40% of
  68   the labels font height. By using the method<I>
  69   PiePlot::SetGuideLinesAdjust()</I> it is possible to specify a
  70   fractional value which is interpretated as the distance between the
  71   bottom of one label to the bottom of the next. This means that
  72   specifying a value of '1.0' the labels will have no space between them
  73   and the bottom of one label will touch the top of another label. By
  74   default this value is 1.4.</P>
  75  <P> By increasing or decreasing this value it is possible to make the
  76   labels become positioned more or less compact. Below we have taken the
  77   above example and reduced the distance to '1.1' and as can be seen this
  78   yields much more compact labeling.<DIV class="example">
  79  <BR> <A href="exframes/frame_pielabelsex4.html" target="blank"><IMG border="0"
  80  HEIGHT="350"  src="img/pielabelsex4.png" WIDTH="300"></A>
  81  <BR><B>Figure 122:</B> Adjusting to a smaller vertical distance between
  82   the labels <A href="exframes/frame_pielabelsex4.html" target="blank">
  83  [src]</A>&nbsp;
  84  <P></P>
  85  </DIV></P>
  86  <P></P>
  87  <P><B> Note:</B> Guide lines is only available in 2D Pie plots.</P>
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