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-- File: Approx_SweepFunction.cdl
-- Created: Wed Jun 25 10:40:14 1997
-- Author: Philippe MANGIN
-- <pmn@sgi29>
---Copyright: Matra Datavision 1997
deferred class SweepFunction from Approx inherits TShared from MMgt
---Purpose: defined the function used by SweepApproximation to
-- perform sweeping application.
uses
Shape from GeomAbs,
Pnt from gp,
Array1OfPnt from TColgp,
Array1OfPnt2d from TColgp,
Array1OfVec from TColgp,
Array1OfVec2d from TColgp,
Array1OfInteger from TColStd,
Array1OfReal from TColStd
raises NotImplemented ,
OutOfRange from Standard
is
--
--========== To compute Sections and derivatives Sections
--
D0(me : mutable;
Param: Real;
First, Last : Real;
Poles : out Array1OfPnt from TColgp;
Poles2d : out Array1OfPnt2d from TColgp;
Weigths : out Array1OfReal from TColStd)
---Purpose: compute the section for v = param
returns Boolean is deferred;
D1(me : mutable;
Param: Real;
First, Last : Real;
Poles : out Array1OfPnt from TColgp;
DPoles : out Array1OfVec from TColgp;
Poles2d : out Array1OfPnt2d from TColgp;
DPoles2d : out Array1OfVec2d from TColgp;
Weigths : out Array1OfReal from TColStd;
DWeigths : out Array1OfReal from TColStd)
---Purpose: compute the first derivative in v direction of the
-- section for v = param
-- Warning : It used only for C1 or C2 aproximation
returns Boolean
raises NotImplemented
is virtual;
D2(me : mutable;
Param: Real;
First, Last : Real;
Poles : out Array1OfPnt from TColgp;
DPoles : out Array1OfVec from TColgp;
D2Poles : out Array1OfVec from TColgp;
Poles2d : out Array1OfPnt2d from TColgp;
DPoles2d : out Array1OfVec2d from TColgp;
D2Poles2d : out Array1OfVec2d from TColgp;
Weigths : out Array1OfReal from TColStd;
DWeigths : out Array1OfReal from TColStd;
D2Weigths : out Array1OfReal from TColStd)
---Purpose: compute the second derivative in v direction of the
-- section for v = param
-- Warning : It used only for C2 aproximation
returns Boolean
raises NotImplemented
is virtual;
--
-- =================== General Information On The Function ===================
--
Nb2dCurves(me)
---Purpose: get the number of 2d curves to approximate.
returns Integer is deferred;
SectionShape(me; NbPoles : out Integer from Standard;
NbKnots : out Integer from Standard;
Degree : out Integer from Standard)
---Purpose: get the format of an section
is deferred;
Knots(me; TKnots: out Array1OfReal from TColStd)
---Purpose: get the Knots of the section
is deferred;
Mults(me; TMults: out Array1OfInteger from TColStd)
---Purpose: get the Multplicities of the section
is deferred;
IsRational(me)
---Purpose: Returns if the sections are rationnal or not
returns Boolean is deferred;
--
-- =================== Management of continuity ===================
--
NbIntervals(me; S : Shape from GeomAbs)
---Purpose: Returns the number of intervals for continuity
-- <S>.
-- May be one if Continuity(me) >= <S>
returns Integer is deferred;
Intervals(me; T : in out Array1OfReal from TColStd;
S : Shape from GeomAbs)
---Purpose: Stores in <T> the parameters bounding the intervals
-- of continuity <S>.
--
-- The array must provide enough room to accomodate
-- for the parameters. i.e. T.Length() > NbIntervals()
raises
OutOfRange from Standard
is deferred;
SetInterval(me: mutable; First, Last: Real from Standard)
---Purpose: Sets the bounds of the parametric interval on
-- the fonction
-- This determines the derivatives in these values if the
-- function is not Cn.
is deferred;
-- ===================== To help computation of Tolerance ======
-- Evaluation of error, in 2d space, or on rational function, is
-- difficult. The following methods can help the approximation to
-- make good evaluation and use good tolerances.
--
-- It is not necessary for the following informations to be very
-- precise. A fast evaluation is sufficient.
Resolution(me;
Index : Integer from Standard;
Tol : Real from Standard;
TolU, TolV : out Real from Standard)
---Purpose: Returns the resolutions in the sub-space 2d <Index>
-- This information is usfull to find an good tolerance in
-- 2d approximation.
---Warning: Used only if Nb2dCurve > 0
raises NotImplemented
is virtual;
GetTolerance(me;
BoundTol, SurfTol, AngleTol : Real;
Tol3d : out Array1OfReal)
---Purpose: Returns the tolerance to reach in approximation
-- to satisfy.
-- BoundTol error at the Boundary
-- AngleTol tangent error at the Boundary (in radian)
-- SurfTol error inside the surface.
is deferred;
SetTolerance(me : mutable; Tol3d, Tol2d : Real)
---Purpose: Is usefull, if (me) have to run numerical
-- algorithm to perform D0, D1 or D2
is deferred;
BarycentreOfSurf(me)
---Purpose: Get the barycentre of Surface.
-- An very poor estimation is sufficent.
-- This information is usefull to perform well
-- conditioned rational approximation.
-- Warning: Used only if <me> IsRational
returns Pnt from gp
raises NotImplemented
is virtual;
MaximalSection(me) returns Real
---Purpose: Returns the length of the greater section. This
-- information is usefull to G1's control.
-- Warning: With an little value, approximation can be slower.
raises NotImplemented
is virtual;
GetMinimalWeight(me; Weigths : out Array1OfReal from TColStd)
---Purpose: Compute the minimal value of weight for each poles
-- in all sections.
-- This information is usefull to control error
-- in rational approximation.
-- Warning: Used only if <me> IsRational
raises NotImplemented
is virtual;
end SweepFunction;
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