HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 70
No Parameters, X, Y Coordinates, Command, Group, The Configuration/Status Group
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Note z No Parameters - Sets P1 and P2 to their default locations, adjusted by any current axis rotation. If an IP command without parameters is executed after the axes are rotated with the RO command, P1 and P2 locations change to reflect the rotation. If the coordinate system orientation subsequently changes (e.g., by sending an RO command), the plotter unit position is maintained with respect to the new orientation. z X,Y Coordinates - Specify the location of P1 (and, optionally, P2) in plotter units. Specifying P2 is not required. If P2 is not specified, P2 tracks P1 and its coordinates change so that the X,Y distances between P2 and P1 stay the same. This tracking process can locate P2 outside the effective window. Used carefully, the tracking function can be useful for preparing more than one equal-sized drawing on a page. For an example, refer to "Drawing Equal-Sized Pictures on a Page" earlier in this chapter. z Neither X,Y coordinate of P1 can equal the corresponding coordinate of P2. If either coordinate of P1 equals the corresponding coordinate of P2, the coordinate of P2 is incremented by 1 plotter unit. The locations of P1 and P2 interact with the following commands: Table 19-11 Commands Affected by P1/P2 Command Group IW, Input Window The Configuration/Status Group RO, Rotate Coordinate System SC, Scale FT, Fill Type The Line and Fill Attributes Group LT, Line Type PW, Pen Width WU, Pen Width Unit Selection DR, Relative Direction LB, Label SR, Relative Character Size The Character Group 19-24 The Configuration and Status Group EN