The attached patch was developed on http://ltk.rplay.net/svn/branches/ltk/repl revision 224
It adds a few useful commands for manipulating fonts. http://www.tcl.tk/man/tcl8.5/TkCmd/font.htm
Example: (font-create :bignum :family :courier :size 30 :weight :bold :slant :italic :underline :true :overstrike :true) (configure some-canvas-text :font :bignum)
Later, Daniel