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

21-28 The Polygon Group EN
Figure 21-17Anisotropic and Isotropic Scaling
z Radius — Specifies the distance from the current pen location
to the start of the wedge’s arc. Since the wedge is a portion of
a circle, this parameter is the radius of the circle. It specifies the
distance from the current pen location (which becomes the center
of the circle), to any point on the circumference of the circle.
The radius is interpreted in current units: as user-units when
scaling is on; as plotter units when scaling is off. The sign
(positive or negative) of the radius determines the location of
the zero-degree reference point. The illustration following the
parameter descriptions shows the location of the zero-degree
reference point for a positive and a negative radius.
z Sweep Angle — Specifies the number of degrees through which
the arc is drawn. A positive sweep angle is in the direction of the
+X-axis to the +Y-axis; a negative sweep angle is in the direction
of the +X-axis to the –Y-axis. However, the relative position of the
+X-axis to the +Y-axis can change as a result of scaling point or
scaling factor changes, thus, changing the direction of the sweep
angle. Also, if you specify a start angle greater than 360°, a start
angle equal to the remainder of the start angle/360° is used.
z Chord Angle — Specifies the chord angle used to draw the arc.
The default is a chord angle of 5 degrees. Refer to the Arc
Absolute (AA) command discussion in Chapter 20 for further
information on chords and chord angles.