Screen display for individual use/ projector viewing

I am building a learning product(in flex/flash) that will get used both by an individual on her desktop, and also by a instructor in a large room. The challenge is rooms, where this will be used, tend to be quite large- as big as 80-90 people and seating far from screen

I am not sure a single font size(12-14 font) will work for all- currently I have built it for "personal use" to use real-estate best and am hoping tweak slightly for "projector mode"- plan is to allow user to selectively pick开发者_JAVA百科 and magnify various sections of the screen- is this a model that is done elsewhere- what are the best practices here?

Any thoughts on how to program for this?

You should keep it down to only a few short lines of text and an image/video if you're presenting this on a projector. The fact is, 12-14px fonts are much too small for that application - you should use 24px and up. Consider that projectors will typically have lower resolutions than monitors and your display will be scaled down somehow, which usually renders small / thin text unreadable. You might want to design for a 1024x768 projector, and let your interface scale so the users see the same display (same proportions and positioning) on their computer - I caution you that if you must use raster images, use high enough resolution images that they don't see a pixelated mess on their high res screens.

A useful article on slide design can be found at http://www.thinkoutsidetheslide.com/articles/select_and_use_fonts.htm and you can probably use the default templates in Powerpoint as a starting point for your layout. Don't shoehorn too much information into one screen!