HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 108
AT, Absolute Arc Three Point, Xinter, Xend, Yend[, chord angle;]
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AT, Absolute Arc Three Point This command draws an arc segment, using absolute coordinates, from a starting point, through an intermediate point, to an end point. Use AT when you know these three points of an arc. AT Xinter,Yinter, Xend,Yend[,chord angle;] Parameter Xinter, Yinter Xend, Yend chord angle Format current units current units clamped real Functional Range Default -230 to 230 - 1 no default -230 to 230 - 1 no default 0.5° to 180° 5° The AT command uses the current pen location and two specified points to calculate a circle and draw the appropriate arc segment of its circumference. The arc starts at the current pen location, using the current pen, line type, line attributes and pen up/down status. You specify the intermediate and end points. After drawing the arc, the pen location remains at the end of the arc. z XInter,YInter - Specify the absolute location of an intermediate point of the arc. The arc is drawn in a positive or negative angle of rotation, as necessary, so that it passes through the intermediate point before the end point. z XEnd,YEnd - Specify the absolute location of the end point of the arc. z Chord Angle - Specifies the chord angle used to draw the arc. The default is a chord angle of 5°. (The Arc Absolute (AA) command description [earlier in this chapter] contains more information on chords and chord angles.) Intermediate and end point 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. Note the following about locating the intermediate and end points: z If the intermediate point and end point are the same as the current pen location, the command draws a dot. z If the intermediate point is the same as either the current pen location or the end point, a line is drawn between the current pen location and the end point. 20-16 The Vector Group EN