[R] Font size and window size

[Jason Horn]

I'm using R on Mac OS X and I have a question.  When re-sizing a  
quartz window, the fonts sizes and line weights in a graphic all stay  
the same - the distances between them just keep getting larger.  Is  
there a way to change this behavior (perhaps with graphics  
parameters) so that when resizing a window, you end up with a larger,  
proportional version of the same graphic.

Thanks