SymbCrvAdapOffsetTrim

Section: C Library Functions (3)
Updated: IRIT Version 6.0
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NAME

SymbCrvAdapOffsetTrim()

SYNOPSIS

symb_lib/offset.c:592

CagdCrvStruct *SymbCrvAdapOffsetTrim(CagdCrvStruct *OrigCrv,
                                     CagdRType OffsetDist,
                                     CagdRType OffsetError,
                                     SymbOffCrvFuncType OffsetAprxFunc,
                                     CagdBType BezInterp)

DESCRIPTION

Same function as CagdCrvAdapOffset, but trims the self intersection loops. See also: Gershon Elber and Elaine Cohen, "Error Bounded Variable Distance Offset Operator for Free Form Curves and Surfaces". International Journal of Computational Geometry & Applications, Vol. 1, Num. 1, March
1991, pp 67-78.

PARAMETERS:

OrigCrv: To approximate its offset curve with distance OffsetDist.

OffsetDist: Amount of offset. Negative denotes other offset direction.

OffsetError: Tolerance control.

OffsetAprxFunc: A function that can be used to approximate an offset of a curve. If NULL SymbCrvOffset function is selected. Third parameter of SymbOffCrvFuncType is optional.

BezInterp: If TRUE, control points are interpolated when the curve is reduced to a Bezier form. Otherwise, control points are translated OffsetDist amount only, under estimating the Offset.

FUNCTION RETURN VALUE

CagdCrvStruct *: An approximation to the offset curve, to within OffsetError.

ORIGIN

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