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Changing one thing on screen without re-rendering everything

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I''m working on an RTS, and I''m trying to set it up so that when you click on a character, their stats come up in a HUD. However, I don''t know how to do this without re-rendering everything else already on screen.

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What you''re attempting to do is a very old way of doing it. 2D Games used to determine what had to be redrawn, mark a segment of the screen as dirty, and in render time, redraw that rectangle.

Nowdays, its generally better to redraw everything every frame. Amongst several reasons, its just makes things so much easier. Particularily in a complex game when most of the screen will need to be redrawn and processing power will be wasted determining what to redraw.

If you wish to try it regardless, Heres a method of the top of my head (considering I haven''t done it for years):

Have a box for the stats with certain coordinates. When the character is selected, mark the rectangle at those coordinates as ''dirty''. At render time, go through your HUD and for every ''dirty'' region, redraw that section.

This require a well-designed HUD drawing routine that organises different infomation to screen coords so that dirty regions can be bound to stats info. Try Googling for an article about this for more detail.

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