HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 158
Drawing Circles in Polygon Mode, `Approximating Polygon Buffer Use,
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Figure 21-9 Filling Polygons: Non-Zero Winding Fill Method Drawing Circles in Polygon Mode Polygon mode interprets the Circle (CI) command differently than the other HP-GL/2 commands. The printer treats a circle as a complete subpolygon. The printer automatically closes the first polygon (if any) before starting the circle, and uses the first coordinates (if any) after the circle is drawn to start a new subpolygon. If you did not close your first polygon completely before sending the CI command, the printer automatically closes the polygon by adding a point (at the starting point of the previous subpolygon). This can change your current pen location and the placement of the circle in your polygon, resulting in an inaccurate polygon. `Approximating Polygon Buffer Use You can use the following formula to estimate how much buffer space a polygon consumes. Each point in a polygon uses 8 bytes. For example, the minimum number of points the printer will hold is 512. 21-14 The Polygon Group EN