HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 103
Changing Arc Smoothness with the Chord Angle, Table 20-6
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z For a specific chord angle, a circle or arc always has the same number of chords, regardless of its size. For example, for the default chord angle, a circle is always composed of 72 chords (360°/5° per chord = 72 chords). This results in larger circles appearing less smooth than smaller circles with the same chord angle; setting the chord angle to a smaller number will help large circles or arcs appear more smooth (see Figure 20-8). Figure 20-8 Changing Arc Smoothness with the Chord Angle Table 20-6 Example: Varying the Chord Angle ECE EC%ØB IN; Reset the printer. Enter HP-GL/2 mode. Initialize HP-GL/2 mode. SP1; Select pen number 1. Even though there is no physical pen, the SP command must be used to enable printing. PA2000,0; Specify (2000,0) as the starting point. PD;AA0,0,45,25; With the pen down, draw a 45° arc (positive angle) with center coordinates of (0,0) and a chord angle of 25°. PU1050,1060; Lift the pen and move to (1050,1060). PD;AA0,0,-45,10; With the pen down, draw a 45° arc (negative angle) using the same center point as the first arc, but with a 10° chord angle. EN AA, Arc Absolute 20-11