HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 102
XCenter, Sweep Angle, Chord Angle,
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Note 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 XCenter, YCenter - Specify the absolute location of the center of the arc. (The center of the arc is the center of the circle that would be drawn if the arc was 360 degrees.) z 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. z Sweep Angle - Specifies in degrees the angle through which the arc is drawn. A positive angle is drawn in a positive direction (angle of rotation); a negative angle is drawn in the negative direction. z Chord Angle - Specifies the chord angle used to draw the arc. The default is a chord angle of 5 degrees. The chord angle specifies, in degrees, the maximum angle created when lines from each end of the chord intersect the center point of the circle (see drawing below). The smaller the chord angle, the smoother the curve. Figure 20-7 Chord Angle 20-10 The Vector Group EN