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-- File: GeomLib_DenominatorMultiplier.cdl
-- Created: Tue May 13 10:36:30 1997
-- Author: Stagiaire Francois DUMONT
-- <dum@brunox.paris1.matra-dtv.fr>
---Copyright: Matra Datavision 1997
class DenominatorMultiplier from GeomLib
---Purpose: this class is used to construct the BSpline curve
-- from an Approximation ( ApproxAFunction from AdvApprox).
uses
BSplineSurface from Geom,
Array1OfReal from TColStd
raises
OutOfRange from Standard,
ConstructionError from Standard
is
Create( Surface : BSplineSurface from Geom ;
KnotVector : Array1OfReal from TColStd)
returns DenominatorMultiplier from GeomLib
raises
ConstructionError from Standard;
---Purpose: if the surface is rational this will define the evaluator
-- of a real function of 2 variables a(u,v) such that
-- if we define a new surface by :
-- a(u,v) * N(u,v)
-- NewF(u,v) = ----------------
-- a(u,v) * D(u,v)
Value(me; UParameter : in Real from Standard ;
VParameter : in Real from Standard)
returns Real from Standard
raises
OutOfRange from Standard
---Purpose: Returns the value of
-- a(UParameter,VParameter)=
--
-- H0(UParameter)/Denominator(Umin,Vparameter)
--
-- D Denominator(Umin,Vparameter)
-- - ------------------------------[H1(u)]/(Denominator(Umin,Vparameter)^2)
-- D U
--
-- + H3(UParameter)/Denominator(Umax,Vparameter)
--
-- D Denominator(Umax,Vparameter)
-- - ------------------------------[H2(u)]/(Denominator(Umax,Vparameter)^2)
-- D U
is static;
fields
mySurface : BSplineSurface from Geom ;
myKnotFlatVector : Array1OfReal from TColStd ;
end MakeCurvefromApprox;
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