HP PCL/PJL reference (PCL 5 Printer Language) - Technical Reference Manual Part II

19-12 The Configuration and Status Group EN
Figure 19-5 Drawing equal-size pictures on a page
Note The P1/P2 frames are not windows or graphics limits; the pen can
print HP-GL/2 images anywhere within the PCL Picture Frame. Note
that the new P1 and P2 retain their scaled values. This allows you to
use the same coordinates on both halves of the page. In contrast, if
you do not assign a scale to P1 and P2, you must calculate the new
plotter unit coordinates for the drawing on the second half of the page.
Creating Mirror-Images
For most drawings, you will probably set P1 and P2 so that P1 is in
the lower-left corner and P2 is in the upper-right corner of the scaling
area. However, you can change the relationship of P1 and P2 to
produce a mirror-image effect.
You can “mirror-image” any scaled drawing (those drawings using
the SC command) by changing the relative locations of P1 and P2,
or changing the coordinate system by using SC. You can mirror-
image labels using the Absolute Direction and Relative Direction
(DI and DR) commands, the Relative Character Size (SR) command,
or using the Absolute Character Size (SI) command. (The DI, DR,
and SR commands are discussed in Chapter 23, The Character
Group.)