To make a temporary short code for a non-standard TrueType font:

leaf.DefineFont 'uncl' 'Uncial'

... which will set up the association between the short code ‘uncl’ and the TrueType font ‘Uncial’. If you give a two-character short code, DefineFont will automatically define a full set of four fonts so that:

leaf.DefineFont 'ga' 'Garamond MT'
leaf.Font 'gai'

... will set the working font to italic Garamond. If you have the font loaded on a PostScript printer, you can add the PostScript font name as the third element:

leaf.DefineFont 'ga' 'Garamond MT' 'Monotype-Garamond'

If you do not give a PostScript font name, all fonts default to Times-Roman on PostScript devices. Note that NewLeaf assumes that all the required fonts have been pre-loaded into the printer.

NB This method assumes that your PostScript fonts will be suffixed ‘Bold’ ‘Italic’ and ‘BoldItalic’ – if this is not the case you must add each font variant individually.

You can make the changes permanent by specifying 1 as the left argument and saving the workspace, but please note that you will need to re-apply your changes every time you upgrade NewLeaf.