HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 105

Table 20-7 LA, Line Attributes LT, Line Type PW, Pen Width The Line and Fill Attributes Group AR, Arc Relative This command draws an arc, using relative coordinates, which starts at the current pen location and pivots around the specified center point. AR Xincrement,Yincrement,sweep angle[,chord angle;] Parameter Format Xincrement,Yincrement current units sweep angle clamped real chord angle clamped real Functional Range -230 to 230 - 1 Default no default -32768 to 32767 no default 0.5° to 180° 5° Note The AR command draws the arc starting at the current pen location using the current pen up/down status, line type, and attributes. After drawing the arc, the pen location remains at the end of the arc. Do not use an adaptive line type when drawing arcs with small chord angles. The printer attempts to draw the complete pattern in every chord (there are 72 chords in a circle using the default chord angle). z XIncrement, YIncrement - Specify the center of the arc relative to the current location. (The center of the arc is the center of the circle that would be drawn if the arc was 360 degrees.) Coordinates are interpreted in current units: as user-units when scaling is on; as plotter units when scaling is off. If current scaling is not isotropic, the arc drawn is elliptical rather than circular. EN AR, Arc Relative 20-13