tikz shrink (?)

[James Ismail]

Hi,  
 
I am trying to shrink an entire picture I've created with TikZ. Using the "scale" option in TikZ is not what I'm after since not scale the fonts or node positions, and hence only shapes are shrunk. In the BEAMER class Frame environment, however, the "shrink" option does what one would expect in that the entire contents of the frame is shrunk.  
 
Does anyone know if there is a "shrink" equivalent in TikZ?  
 
 
 
Thanks,  
James