help for grafic statements

Hello, on PSC I found a very nice program which makes astrological calculations. The author uses API calls to display characters and drawings of sky objects (to speed up the process). I would like to use a different font (the TTF included in the attached file, gliphs 230-253) to display the zodiac signs AND the sky objects, but I am not able to make these changes in the code. Can anybody help me? Many thanks in advance. Dario Barbieri