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

22-26 The Line and Fill Attributes Group EN
Figure 22-17Line Type Patterns and Pattern Percentages
z Pattern Length- Specifies the length of one complete line
pattern, either as a percentage of the diagonal distance between
the scaling points P1 and P2 or in millimeters (see mode below).
You must specify a length greater than zero or the printer ignores
the command. If you do not specify a length, the printer uses the
last value specified.
z Mode- Specifies how the values of the pattern length parameter
are interpreted. If you do not specify a mode, the printer uses
the last value specified. Values other than 0 or 1 invalidate the
command.
z 0 - Relative mode. Interprets the pattern length parameter as
a percentage of the diagonal distance between P1 and P2.
z When specified as a percentage, the pattern length changes
along with changes in P1 and P2.