+++ /dev/null
--- Created on: 1993-03-24
--- Created by: DUB
--- Copyright (c) 1993-1999 Matra Datavision
--- Copyright (c) 1999-2014 OPEN CASCADE SAS
---
--- This file is part of Open CASCADE Technology software library.
---
--- This library is free software; you can redistribute it and/or modify it under
--- the terms of the GNU Lesser General Public License version 2.1 as published
--- by the Free Software Foundation, with special exception defined in the file
--- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
--- distribution for complete text of the license and disclaimer of any warranty.
---
--- Alternatively, this file may be used under the terms of Open CASCADE
--- commercial license or contractual agreement.
-
-class BSplineCurveToBezierCurve from Geom2dConvert
-
- --- Purpose :An algorithm to convert a BSpline curve into a series
- -- of adjacent Bezier curves.
- -- A BSplineCurveToBezierCurve object provides a framework for:
- -- - defining the BSpline curve to be converted
- -- - implementing the construction algorithm, and
- -- - consulting the results.
- -- References :
- -- Generating the Bezier points of B-spline curves and surfaces
- -- (Wolfgang Bohm) CAD volume 13 number 6 november 1981
-
-
-uses
- Array1OfReal from TColStd,
- Array1OfBezierCurve from TColGeom2d,
- BezierCurve from Geom2d,
- BSplineCurve from Geom2d
-
-
-raises
- DimensionError from Standard,
- DomainError from Standard,
- OutOfRange from Standard
-
-is
-
-
- Create (BasisCurve : BSplineCurve) returns BSplineCurveToBezierCurve;
- --- Purpose : Computes all the data needed to convert
- -- - the BSpline curve BasisCurve, into a series of adjacent Bezier arcs.
- -- The result consists of a series of BasisCurve arcs
- -- limited by points corresponding to knot values of the curve.
- -- Use the available interrogation functions to ascertain
- -- the number of computed Bezier arcs, and then to
- -- construct each individual Bezier curve (or all Bezier curves).
- -- Note: ParametricTolerance is not used.
-
- Create (BasisCurve : BSplineCurve;
- U1, U2 : Real;
- ParametricTolerance : Real)
- returns BSplineCurveToBezierCurve
- --- Purpose : Computes all the data needed to convert
- -- the portion of the BSpline curve BasisCurve
- -- limited by the two parameter values U1 and U2
- -- for Example if there is a Knot Uk and
- -- Uk < U < Uk + ParametricTolerance/2 the last curve
- -- corresponds to the span [Uk-1, Uk] and not to [Uk, Uk+1]
- -- The result consists of a series of BasisCurve arcs
- -- limited by points corresponding to knot values of the curve.
- -- Use the available interrogation functions to ascertain
- -- the number of computed Bezier arcs, and then to
- -- construct each individual Bezier curve (or all Bezier curves).
- -- Note: ParametricTolerance is not used.
- -- Raises DomainError if U1 or U2 are out of the parametric bounds of the basis
- -- curve [FirstParameter, LastParameter]. The Tolerance criterion
- -- is ParametricTolerance.
- -- Raised if Abs (U2 - U1) <= ParametricTolerance.
- raises DomainError;
-
-
- Arc (me : in out; Index : Integer) returns BezierCurve
- --- Purpose :Constructs and returns the Bezier curve of index
- -- Index to the table of adjacent Bezier arcs
- -- computed by this algorithm.
- -- This Bezier curve has the same orientation as the
- -- BSpline curve analyzed in this framework.
- -- Exceptions
- -- Standard_OutOfRange if Index is less than 1 or
- -- greater than the number of adjacent Bezier arcs
- -- computed by this algorithm.
- raises OutOfRange
- is static;
-
-
- Arcs (me : in out; Curves : in out Array1OfBezierCurve)
- --- Purpose :Constructs all the Bezier curves whose data is
- -- computed by this algorithm and loads these curves
- -- into the Curves table.
- -- The Bezier curves have the same orientation as the
- -- BSpline curve analyzed in this framework.
- -- Exceptions
- -- Standard_DimensionError if the Curves array was
- -- not created with the following bounds:
- -- - 1 , and
- -- - the number of adjacent Bezier arcs computed by
- -- this algorithm (as given by the function NbArcs).
- raises DimensionError
- is static;
-
- Knots(me; TKnots : out Array1OfReal from TColStd)
- ---Purpose: This methode returns the bspline's knots associated to
- -- the converted arcs
- -- Raises DimensionError if the length of Curves is not equal to
- -- NbArcs + 1
- raises DimensionError
- is static;
-
- NbArcs (me) returns Integer is static;
- --- Purpose :
- -- Returns the number of BezierCurve arcs.
- -- If at the creation time you have decomposed the basis curve
- -- between the parametric values UFirst, ULast the number of
- -- BezierCurve arcs depends on the number of knots included inside
- -- the interval [UFirst, ULast].
- -- If you have decomposed the whole basis B-spline curve the number
- -- of BezierCurve arcs NbArcs is equal to the number of knots less
- -- one.
-
-fields
-
- myCurve : BSplineCurve from Geom2d;
-end BSplineCurveToBezierCurve;
projects / occt.git / blobdiff