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210 lines
7.5 KiB
Plaintext
Executable File
210 lines
7.5 KiB
Plaintext
Executable File
-- Created on: 1997-06-25
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-- Created by: Philippe MANGIN
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-- Copyright (c) 1997-1999 Matra Datavision
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-- Copyright (c) 1999-2012 OPEN CASCADE SAS
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--
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-- The content of this file is subject to the Open CASCADE Technology Public
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-- License Version 6.5 (the "License"). You may not use the content of this file
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-- except in compliance with the License. Please obtain a copy of the License
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-- at http://www.opencascade.org and read it completely before using this file.
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--
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-- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
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-- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
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--
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-- The Original Code and all software distributed under the License is
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-- distributed on an "AS IS" basis, without warranty of any kind, and the
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-- Initial Developer hereby disclaims all such warranties, including without
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-- limitation, any warranties of merchantability, fitness for a particular
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-- purpose or non-infringement. Please see the License for the specific terms
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-- and conditions governing the rights and limitations under the License.
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deferred class SweepFunction from Approx inherits TShared from MMgt
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---Purpose: defined the function used by SweepApproximation to
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-- perform sweeping application.
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uses
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Shape from GeomAbs,
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Pnt from gp,
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Array1OfPnt from TColgp,
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Array1OfPnt2d from TColgp,
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Array1OfVec from TColgp,
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Array1OfVec2d from TColgp,
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Array1OfInteger from TColStd,
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Array1OfReal from TColStd
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raises NotImplemented ,
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OutOfRange from Standard
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is
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--
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--========== To compute Sections and derivatives Sections
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--
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D0(me : mutable;
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Param: Real;
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First, Last : Real;
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Poles : out Array1OfPnt from TColgp;
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Poles2d : out Array1OfPnt2d from TColgp;
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Weigths : out Array1OfReal from TColStd)
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---Purpose: compute the section for v = param
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returns Boolean is deferred;
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D1(me : mutable;
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Param: Real;
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First, Last : Real;
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Poles : out Array1OfPnt from TColgp;
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DPoles : out Array1OfVec from TColgp;
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Poles2d : out Array1OfPnt2d from TColgp;
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DPoles2d : out Array1OfVec2d from TColgp;
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Weigths : out Array1OfReal from TColStd;
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DWeigths : out Array1OfReal from TColStd)
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---Purpose: compute the first derivative in v direction of the
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-- section for v = param
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-- Warning : It used only for C1 or C2 aproximation
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returns Boolean
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raises NotImplemented
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is virtual;
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D2(me : mutable;
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Param: Real;
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First, Last : Real;
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Poles : out Array1OfPnt from TColgp;
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DPoles : out Array1OfVec from TColgp;
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D2Poles : out Array1OfVec from TColgp;
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Poles2d : out Array1OfPnt2d from TColgp;
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DPoles2d : out Array1OfVec2d from TColgp;
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D2Poles2d : out Array1OfVec2d from TColgp;
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Weigths : out Array1OfReal from TColStd;
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DWeigths : out Array1OfReal from TColStd;
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D2Weigths : out Array1OfReal from TColStd)
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---Purpose: compute the second derivative in v direction of the
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-- section for v = param
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-- Warning : It used only for C2 aproximation
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returns Boolean
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raises NotImplemented
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is virtual;
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--
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-- =================== General Information On The Function ===================
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--
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Nb2dCurves(me)
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---Purpose: get the number of 2d curves to approximate.
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returns Integer is deferred;
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SectionShape(me; NbPoles : out Integer from Standard;
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NbKnots : out Integer from Standard;
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Degree : out Integer from Standard)
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---Purpose: get the format of an section
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is deferred;
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Knots(me; TKnots: out Array1OfReal from TColStd)
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---Purpose: get the Knots of the section
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is deferred;
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Mults(me; TMults: out Array1OfInteger from TColStd)
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---Purpose: get the Multplicities of the section
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is deferred;
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IsRational(me)
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---Purpose: Returns if the sections are rationnal or not
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returns Boolean is deferred;
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--
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-- =================== Management of continuity ===================
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--
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NbIntervals(me; S : Shape from GeomAbs)
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---Purpose: Returns the number of intervals for continuity
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-- <S>.
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-- May be one if Continuity(me) >= <S>
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returns Integer is deferred;
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Intervals(me; T : in out Array1OfReal from TColStd;
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S : Shape from GeomAbs)
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---Purpose: Stores in <T> the parameters bounding the intervals
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-- of continuity <S>.
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--
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-- The array must provide enough room to accomodate
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-- for the parameters. i.e. T.Length() > NbIntervals()
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raises
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OutOfRange from Standard
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is deferred;
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SetInterval(me: mutable; First, Last: Real from Standard)
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---Purpose: Sets the bounds of the parametric interval on
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-- the fonction
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-- This determines the derivatives in these values if the
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-- function is not Cn.
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is deferred;
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-- ===================== To help computation of Tolerance ======
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-- Evaluation of error, in 2d space, or on rational function, is
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-- difficult. The following methods can help the approximation to
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-- make good evaluation and use good tolerances.
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--
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-- It is not necessary for the following informations to be very
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-- precise. A fast evaluation is sufficient.
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Resolution(me;
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Index : Integer from Standard;
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Tol : Real from Standard;
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TolU, TolV : out Real from Standard)
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---Purpose: Returns the resolutions in the sub-space 2d <Index>
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-- This information is usfull to find an good tolerance in
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-- 2d approximation.
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---Warning: Used only if Nb2dCurve > 0
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raises NotImplemented
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is virtual;
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GetTolerance(me;
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BoundTol, SurfTol, AngleTol : Real;
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Tol3d : out Array1OfReal)
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---Purpose: Returns the tolerance to reach in approximation
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-- to satisfy.
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-- BoundTol error at the Boundary
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-- AngleTol tangent error at the Boundary (in radian)
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-- SurfTol error inside the surface.
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is deferred;
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SetTolerance(me : mutable; Tol3d, Tol2d : Real)
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---Purpose: Is usefull, if (me) have to run numerical
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-- algorithm to perform D0, D1 or D2
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is deferred;
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BarycentreOfSurf(me)
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---Purpose: Get the barycentre of Surface.
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-- An very poor estimation is sufficent.
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-- This information is usefull to perform well
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-- conditioned rational approximation.
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-- Warning: Used only if <me> IsRational
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returns Pnt from gp
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raises NotImplemented
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is virtual;
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MaximalSection(me) returns Real
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---Purpose: Returns the length of the greater section. This
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-- information is usefull to G1's control.
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-- Warning: With an little value, approximation can be slower.
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raises NotImplemented
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is virtual;
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GetMinimalWeight(me; Weigths : out Array1OfReal from TColStd)
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---Purpose: Compute the minimal value of weight for each poles
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-- in all sections.
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-- This information is usefull to control error
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-- in rational approximation.
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-- Warning: Used only if <me> IsRational
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raises NotImplemented
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is virtual;
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end SweepFunction;
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