HP 5961-0509 manual AT, Absolute Arc Three Point, 20-16The Vector Group

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			Format	Functional Range	Default
X		, Y	current units	-230to 230 - 1	no default
	inter inter
X	end	, Y	current units	-230to 230 - 1	no default
		end
chord angle			clamped real	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.

zXInter,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 inter- mediate point before the end point.

zXEnd,YEnd — Specify the absolute location of the end point of the arc.

zChord 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:

zIf the intermediate point and end point are the same as the current pen location, the command draws a dot.

zIf 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.

20-16The Vector Group EN