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