void PixPerUnit (pixels) BPLT.C Level 1
int pixels The number of pixels per inch (cm) to be used to convert sizing and positioning parameters from physical lengths to pixel units. The default length is 910 pixels/inch or 358 pixels/cm. This corresponds to a plot length of 9.0" or 22.86 cm.
Because GraphiC supports variable output page sizes, GraphiC needs to know how to map the internal pixel coordinate system to your output device. You are free to specify this scaling, but we recommend that it match the plot length of an L printer dump that you specified when you set up your printer for use with GraphiC. If you make any other choice, the sizes on your printer output will not match the specifications in your program.

This function must be called before page() or the scaling will not be correct.

You may call PlotLength() instead of PixPerUnit() to specify the scaling in terms of plot length.