AT&T 6300 Programmer's Manual page 196

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Drawing Rays

The CIRCLE statement can draw a ray from

the center of the arc to either arc endpoint. A

negative endpoint generates a ray to that

endpoint. The endpoint, -0, is not treated as a

negative endpoint. To circumvent this

limitation, use a small negative number (e.g.,

-0.001 instead of -0). When both endpoints

are negative, both rays are drawn. The minus

sign does not affect the arc itself, Le., the

angles will be treated as if they were positive.

Note that this is different from adding 2*PI

(where PI is 3.141593). The start angle may be

greater or less than the end angle. For

100 CIRCLE (100,150],50,1,

-0.001, -3.141593/2

will draw a quarter of a circle delimited by two

Last Point Referenced

The last point referenced after a circle (or

ellipse) has been drawn is the center of the

circle (or ellipse).

Points that are off the screen or the graphics

viewport are not drawn by the CIRCLE

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