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  28  <H2><A NAME="10_23">10.23 Adding icons onto the graph</A></H2>
  29  <P> In addition to the standard background image you can also add an
  30   arbitrary number of icons onto the background of the graph. These icons
  31   are created with a call to the special Plot class<I> IconPlot</I>.</P>
  32  <P> The image from icons are taken from a file or as one of the builtin
  33   country flags.</P>
  34  <P> You may control how much of the icon should be blended into the
  35   background by specifying a percentage (1-100). The example below shows
  36   how to mix in the picture of &quot;Tux&quot; into the background of a filled line
  37   graph. Note: This example uses alpha blending and will therefore
  38   require GD2.<DIV class="example">
  39  <BR> <A href="exframes/frame_lineiconex1.html" target="blank"><IMG border="0"
  40  HEIGHT="250"  src="img/lineiconex1.png" WIDTH="400"></A>
  41  <BR><B>Figure 180:</B> Adding an icon into the background <A href="exframes/frame_lineiconex1.html"
  42  target="blank">[src]</A>&nbsp;
  43  <P></P>
  44  </DIV></P>
  45  <P> To specify any of the roughly 200 country flags as an icon you first
  46   create an empty Icon and then call the IconPlot::SetCountryFlag() with
  47   the appropriate parameters. (See the class reference). This is
  48   illustrated below by adding the Icelandic flag into the background as
  49   an icon<DIV class="example">
  50  <BR> <A href="exframes/frame_lineiconex2.html" target="blank"><IMG border="0"
  51  HEIGHT="250"  src="img/lineiconex2.png" WIDTH="400"></A>
  52  <BR><B>Figure 181:</B> Adding an icon flag into the background <A href="exframes/frame_lineiconex2.html"
  53  target="blank">[src]</A>&nbsp;
  54  <P></P>
  55  </DIV></P>
  56  <P><DIV class="note"><B>Note:</B> Some older versions of PHP pre-4.3.3
  57   using the builtin GD have problems rendering blended images. If you
  58   have this problem then you need to upgrade to a more recent version of
  59   PHP.</DIV></P>
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