The family (face) of the text to use. The exact meaning of this depends on the type of
format used. For SVG graphs, where fonts are not embedded,
this can be any string at all - it is the SVG viewers responsibility to choose an appropriate font.
For PNG graphs created from the Tag library, the font name may either match a name specified by a
font tag, or it will be passed in to the
Font constructor.
The default value is "Default", which maps to a sans-serif font.
Example: Using a system font
<bfg:axesgraph>
<label fontfamily="serif">My Label</label>
...
</bfg:axesgraph>
Example: Embedding a truetype font using the Tag library
<bfg:font name="myfont" src="http://localhost/myfont.ttf" />
<bfg:axesgraph>
<label fontfamily="myfont">My Label</label>
...
</bfg:axesgraph>