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-- File: GeomFill_CircularBlendFunc.cdl
-- Created: Fri Jul 11 13:33:09 1997
-- Author: Philippe MANGIN
-- <pmn@sgi29>
---Copyright: Matra Datavision 1997
private class CircularBlendFunc from GeomFill
inherits SweepFunction from Approx
---Purpose: Circular Blend Function to approximate by
-- SweepApproximation from Approx
uses
HCurve from Adaptor3d,
BSplineCurve from Geom,
ParameterisationType from Convert,
Array1OfPnt from TColgp,
Array1OfVec from TColgp,
Array1OfPnt2d from TColgp,
Array1OfVec2d from TColgp,
Array1OfReal from TColStd,
Array1OfInteger from TColStd,
Shape from GeomAbs,
Pnt from gp
raises OutOfRange from Standard
is
Create( Path : HCurve from Adaptor3d;
Curve1 : HCurve from Adaptor3d;
Curve2 : HCurve from Adaptor3d;
Radius : Real from Standard;
Polynomial : Boolean = Standard_False)
---Purpose: Create a Blend with a constant radius with 2
-- guide-line. <FShape> sets the type of fillet
-- surface. The -- default value is Convert_TgtThetaOver2 (classical --
-- nurbs -- representation of circles).
-- ChFi3d_QuasiAngular -- corresponds to a nurbs
-- representation of circles -- which
-- parameterisation matches the circle one. --
-- ChFi3d_Polynomial corresponds to a polynomial --
-- representation of circles.
returns CircularBlendFunc from GeomFill;
-- --
-- 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
--
--
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
Discret(me:mutable)
is private;
fields
myBary : Pnt from gp;
myRadius : Real;
myMinW : Real;
maxang : Real;
minang : Real;
distmin : Real;
myPath : HCurve from Adaptor3d;
myCurve1 : HCurve from Adaptor3d;
myCurve2 : HCurve from Adaptor3d;
myTPath : HCurve from Adaptor3d;
myTCurve1 : HCurve from Adaptor3d;
myTCurve2 : HCurve from Adaptor3d;
myDegree : Integer;
myNbKnots : Integer;
myNbPoles : Integer;
myTConv : ParameterisationType from Convert;
myreverse : Boolean;
end CircularBlendFunc;
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