In addition to the predefined fonts it is possible to easily use up to three custom fonts. This is done by first specifying the name of the font file that should be used and then specifying the font family as either FF_USERFONT1, FF_USERFONT2 or FF_USERFONT3. A new font is installed by calling one or more of the methods

The argument to these methods should be the full font file name (including full path) for the normal, bold, italic and/or bolditalic variant of the font family. All arguments apart from "$aNormal" are optional.

An example on how this can be used to use a special font for the title of a graph is shown in Example 8.1

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<?php
// ...
$graph->SetUserFont('/usr/share/fonts/ttf/digital.ttf');
$graph->title->SetFont(FF_USERFONT,FS_NORMAL,12);
$graph->title->Set('Test title '.$pi);
// ...
?>