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

EN RT, Relative Arc Three Point 20-49
z If the end point is the same as the current pen location, a circle is
drawn, with its diameter being the distance between the current
pen position and the intermediate point.
z If the current pen position, intermediate point, and end point are
collinear, a straight line is drawn.
z If the intermediate point does not lie between the current pen
location and the end point, and the three points are collinear, two
lines are drawn, one from the current pen location and the other
from the end point, leaving a gap between them. Refer to the
following illustration. Both lines extend to the PCL Picture Frame
limits or current window.
Figure 20-21
Table 20-31 Example: Using the RT Command (Relative Arc
Three Point)
E
C
E Reset the printer.
E
C
%ØB Enter HP-GL/2 mode.
IN; Initialize HP-GL/2 mode.