Brother HL-1050 Technical Reference Manual page 357

 Plotting is performed only when the pen is down.
 When the pen is up, plotting is not performed but the cursor position moves to the plot end point.
 When scaling has been performed, the cursor is moved by relative coordinates in user units.
 Also, when scaling has been performed, the values for X and Y are real numbers.
 When there is no scaling, the cursor is moved by relative coordinates in graphics units.
 When there is no scaling, the coordinate values for X and Y are integer numbers.
 The value for qc is a clamped real number.
 When qc is positive, counterclockwise plotting from the current point is performed.
 When qc is negative, plotting is made clockwise from the current position.
 The value for qd is a clamped real number.
 When qd is not specified, the chord angle is the default value ( 5 degrees ).
10 '*** AREX1 ***
20 LPRINT "IN;SP1;IP2650,1325,7650,6325;"
30 LPRINT "SC-100,100,-100,100;"
40 LPRINT "PA-80,-80;PD;AR0,50,90;AR50,0,90;PU;"
50 END
<Sample 69>
10 ' *** AREX2 ***
20 LPRINT "IN;SP1;IP2650,1325,7650,6325;"
30 LPRINT "SC-100,100,-100,100;"
40 LPRINT "PA-100,70;PD;PR30,0;AR-,-70,-90;AR70,0,90;PR60,0;PU;"
50 END
100 END
<Sample 70>
CI - Circle plot
CI r(, qd)[;]
r : Radius of circle ( in user units or graphic units )
qd : Chord angle ( in degrees )
 Plots a circle centred on the current position with a radius r and chord angle qd.
 After plotting, the cursor returns to its point of origin at the centre of the circle.
 Plotting is performed whether the pen is up or down.
 When scaling has been performed, the circle is plotted in user units.
 Also, when scaling has been performed, the value for r is a real number.
 When scaling is off, the circle is plotted in graphics units.
 When there is no scaling, the coordinate value for r is an integer number.
 When qd is not specified, the chord angle is the default value (5 degrees).
Radius
Current position
CHAPTER 9 HP-GL - 12
Chord angle