OpenGL/GLUT - Changing coordinate system?

[Plazmotech]

Hey. I'm using OpenGL/GLUT. Currently the coordinate system is like this

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$ = -2, 0 + = 0, 0 # = 2, 0 @ = 0, 2 & = 0, -2 % = -2, 2

+-----------+ |% @ | | | |$ + #| | | | & | +-----------+

This is EXTREMELY annoying for dynamically changing points. This is what I would like the coordinate system to be like

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$ = 0, 50 + = 50, 50 # = 100, 50 @ = 50, 0 & = 50, 100 % = 0, 0

+-----------+ |% @ | | | |$ + #| | | | & | +-----------+

How can I do this? Thank you so much.