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-- File: BRepBlend_AppFuncRoot.cdl
-- Created: Tue May 12 14:50:30 1998
-- Author: Philippe NOUAILLE
-- <pne@cleox.paris1.matra-dtv.fr>
---Copyright: Matra Datavision 1998
deferred class AppFuncRoot from BRepBlend inherits SweepFunction from Approx
---Purpose: Function to approximate by AppSurface
---Level: Advanced
uses
Line from BRepBlend,
Point from Blend,
AppFunction from Blend,
Shape from GeomAbs,
Vector from math,
Pnt from gp,
Array1OfPnt from TColgp,
Array1OfPnt2d from TColgp,
Array1OfVec from TColgp,
Array1OfVec2d from TColgp,
Array1OfReal from TColStd,
Array1OfInteger from TColStd,
HArray1OfPnt from TColgp,
HArray1OfPnt2d from TColgp,
HArray1OfVec from TColgp,
HArray1OfVec2d from TColgp,
HArray1OfReal from TColStd
raises OutOfRange
is
Initialize(Line : in out Line from BRepBlend;
Func : in out AppFunction from Blend;
Tol3d : Real from Standard;
Tol2d : Real from Standard)
---Warning: The Object Func cannot be killed before me.
returns AppFuncRoot;
--
-- 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 redefined;
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
returns Boolean
is redefined;
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
returns Boolean
is redefined;
--
-- General Information On The Function
--
Nb2dCurves(me)
---Purpose: get the number of 2d curves to approximate.
returns Integer
is redefined;
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 redefined;
Knots(me; TKnots: out Array1OfReal from TColStd)
---Purpose: get the Knots of the section
is redefined;
Mults(me; TMults: out Array1OfInteger from TColStd)
---Purpose: get the Multplicities of the section
is redefined;
IsRational(me)
---Purpose: Returns if the section is rationnal or not
returns Boolean
is redefined;
--
-- Mangement 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 redefined;
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 redefined;
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 redefined;
--
-- To help computation of Tolerance
--
-- Evaluation of error, in 2d space, or on rational function, is
-- dificult. The folowing methodes can help
--
--
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
is redefined;
GetTolerance(me;
BoundTol, SurfTol, AngleTol : Real;
Tol3d : out Array1OfReal)
---Purpose: Returns the tolerance to reach in approximation
-- to respecte
-- BoundTol error at the Boundary
-- AngleTol tangent error at the Boundary (in radian)
-- SurfTol error inside the surface.
is redefined;
SetTolerance(me : mutable; Tol3d, Tol2d : Real)
---Purpose: Is usfull, if (me) have to be run numerical
-- algorithme to perform D0, D1 or D2
is redefined;
BarycentreOfSurf(me)
---Purpose: Get the barycentre of Surface. An very poor
-- estimation is sufficent. This information is usefull
-- to perform well conditionned rational approximation.
---Warning: Used only if <me> IsRational
returns Pnt from gp
is redefined;
MaximalSection(me) returns Real
---Purpose: Returns the length of the maximum section. This
-- information is usefull to perform well conditionned rational
-- approximation.
---Warning: Used only if <me> IsRational
is redefined;
GetMinimalWeight(me; Weigths : out Array1OfReal from TColStd)
---Purpose: Compute the minimal value of weight for each poles
-- of all sections. This information is usefull to
-- perform well conditionned rational approximation.
---Warning: Used only if <me> IsRational
is redefined;
-- Private methods
SearchPoint(me:mutable;
Func : in out AppFunction from Blend;
Param : Real;
Pnt : in out Point from Blend)
returns Boolean
is private;
SearchLocation(me;
Param : Real;
FirstIndex, LastIndex : Integer;
ParamIndex : in out Integer)
returns Boolean
raises OutOfRange
is private;
Point(me;
Func : AppFunction from Blend;
Param : Real;
Sol : Vector from math;
Pnt : in out Point from Blend)
is deferred;
Vec(me;
Sol : in out Vector from math;
Pnt : Point from Blend)
is deferred;
fields
myLine : Line from BRepBlend;
myFunc : Address;
mydimension : Integer;
myTolerance : Vector;
myPnt : Point from Blend;
myBary : Pnt from gp;
X1, X2, XInit, Sol : Vector from math;
end AppFuncRoot;
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