12.2. Drawing Area   

The graphics area for the Calcomp routines is assumed to be 22.00" by 16.75" and the initial origin set at (X,Y)=(1.5,1.0). (This seems a little strange but we will learn more later).

The N is used to indicate function of plot routine. 


      If N = +-3 ---> move only

         N = +-2 ---> draw only

         N = 999 ---> call enplot

If N < 0 then select X,Y as origin for new co-ordinate system. (The origin is reset to the centre of the drawing area in the following example which draws a square.)

Note all X,Y are relative to the origin - to set new origin use N < 0.