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1996-07-16
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716b
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.TH ARC
6 "IRIT Version 6.0"
.SH NAME
ARC
CurveType ARC( VectorType StartPos, VectorType Center, VectorType EndPos )
Constructs an arc between the two end points StartPos and EndPos,
centered at Center. Arc will always be less than 180 degrees, so the
shortest circular path from StartPos to EndPos is selected. The
case where StartPos, Center, and EndPos are collinear is
illegal, since it attempts to define a 180 degrees arc. Arc is constructed
as a single rational quadratic Bezier curve.
Example:
Arc1 = ARC( vector( 1.0, 0.0, 0.0 ),
vector( 1.0, 1.0, 0.0 ),
vector( 0.0, 1.0, 0.0 ) );
constructs a 90 degrees arc, tangent to both the X and Y axes at coordinate 1.