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<A HREF="toc.html">Contents</A>
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<A HREF="922Usingcountryflagsinvariouscontext.html">Previous</A>
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<A HREF="10Workingwithcanvasgraphs.html">Next</A>
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<HR NOSHADE>
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<H2><A NAME="9_23">9.23 Adding icons onto the graph</A></H2>
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<P> In addition to the standard background image you can also add an
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arbitrary number of icons onto the background of the graph. These icons
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are created with a call to the special Plot class<I> IconPlot</I>.</P>
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<P> The image from icons are taken from a file or as one of the builtin
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country flags.</P>
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<P> You may control how much of the icon should be blended into the
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background by specifying a percentage (1-100). The example below shows
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how to mix in the picture of "Tux" into the background of a filled line
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graph. Note: This example uses alpha blending and will therefore
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require GD2.<DIV class="example">
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<BR> <A href="exframes/frame_lineiconex1.html" target="blank"><IMG border="0"
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HEIGHT="250" src="img/img/img/img/img/img/lineiconex1.png" WIDTH="400"></A>
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<BR><B>Figure 184:</B> Adding an icon into the background <A href="exframes/frame_lineiconex1.html"
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target="blank">[src]</A>
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<P></P>
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</DIV></P>
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<P> To specify any of the roughly 200 country flags as an icon you first
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create an empty Icon and then call the IconPlot::SetCountryFlag() with
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the appropriate parameters. (See the class reference). This is
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illustrated below by adding the Icelandic flag into the background as
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an icon<DIV class="example">
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<BR> <A href="exframes/frame_lineiconex2.html" target="blank"><IMG border="0"
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HEIGHT="250" src="img/img/img/img/img/img/lineiconex2.png" WIDTH="400"></A>
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<BR><B>Figure 185:</B> Adding an icon flag into the background <A href="exframes/frame_lineiconex2.html"
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target="blank">[src]</A>
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<P></P>
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</DIV></P>
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<P><DIV class="note"><B>Note:</B> Some older versions of PHP pre-4.3.3
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using the builtin GD have problems rendering blended images. If you
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have this problem then you need to upgrade to a more recent version of
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PHP.</DIV></P>
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<A HREF="toc.html">Contents</A>
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<A HREF="922Usingcountryflagsinvariouscontext.html">Previous</A>
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<A HREF="10Workingwithcanvasgraphs.html">Next</A>
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