Graphics data conversions

[Steve Smith]

Has anyone had experience with graphing data points in Turbo C?  
I'm trying to get data (both neg and pos) to fit within the 
getmaxx(); and getmaxy(); of a screen.  I need a routine that 
converts the data points into a useable scale.  I'm using just
the lineto(x,y); and moveto(x,y); functions to plot points.

Any help would be appreciated!

S Smith
CSU Fort Collins, Colorado