Plotting Units
In the GL mode, the X and Y axes can be expressed in two ways plotter units
and user units.
The plotter units are used to convert the number to equivalent dot coordinates to
specify distances, and the user units depend on the Scale (SC) command.
Plotter Units
One plotter unit is 0.025mm. 1mm is equivalent to 40 plotter units. The minimum
value of the coordinate system is 1 plotter unit.
1 plotter unit = 0.025mm/0.00098inch
40 plotter units = 1mm
1016 plotter units = 1inch
User Units
You can specify the coordinate system defined by users, and plot it. You can set
it by the Scale (SC) command which specifies the values of the scale points P1
and P2. For example, after you specify the scale points of (0,0) and (1,1), you
can specify all coordinate system data in fractions between 0 and 1.
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