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201 lines
9.7 KiB
Plaintext
Executable File
201 lines
9.7 KiB
Plaintext
Executable File
-- Created on: 1993-10-20
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-- Created by: Bruno DUMORTIER
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-- Copyright (c) 1993-1999 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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class CompBezierCurvesToBSplineCurve from Convert
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---Purpose: An algorithm to convert a sequence of adjacent
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-- non-rational Bezier curves into a BSpline curve.
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-- A CompBezierCurvesToBSplineCurve object provides a framework for:
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-- - defining the sequence of adjacent non-rational Bezier
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-- curves to be converted into a BSpline curve,
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-- - implementing the computation algorithm, and
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-- - consulting the results.
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-- Warning
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-- Do not attempt to convert rational Bezier curves using this type of algorithm.
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uses
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Array1OfReal from TColStd,
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SequenceOfReal from TColStd,
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SequenceOfInteger from TColStd,
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Array1OfInteger from TColStd,
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Array1OfPnt from TColgp,
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SequenceOfPnt from TColgp,
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SequenceOfArray1OfPoles from Convert
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-------------------------------------------------------------------------
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--- Don't forget to use the method Perform before accessing the Result.
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-------------------------------------------------------------------------
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raises
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ConstructionError from Standard
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is
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Create ( AngularTolerance : Real = 1.0e-4 )
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returns CompBezierCurvesToBSplineCurve from Convert;
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---Purpose: Constructs a framework for converting a sequence of
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-- adjacent non-rational Bezier curves into a BSpline curve.
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-- Knots will be created on the computed BSpline curve at
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-- each junction point of two consecutive Bezier curves. The
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-- degree of continuity of the BSpline curve will be increased at
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-- the junction point of two consecutive Bezier curves if their
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-- tangent vectors at this point are parallel. AngularTolerance
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-- (given in radians, and defaulted to 1.0 e-4) will be used
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-- to check the parallelism of the two tangent vectors.
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-- Use the following functions:
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-- - AddCurve to define in sequence the adjacent Bezier
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-- curves to be converted,
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-- - Perform to compute the data needed to build the BSpline curve,
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-- - and the available consultation functions to access the
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-- computed data. This data may be used to construct the BSpline curve.
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AddCurve( me : in out;
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Poles : Array1OfPnt from TColgp)
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is static;
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--- Purpose: Adds the Bezier curve defined by the table of poles Poles, to
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-- the sequence (still contained in this framework) of adjacent
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-- Bezier curves to be converted into a BSpline curve.
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-- Only polynomial (i.e. non-rational) Bezier curves are
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-- converted using this framework.
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-- If this is not the first call to the function (i.e. if this framework
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-- still contains data in its Bezier curve sequence), the degree
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-- of continuity of the BSpline curve will be increased at the
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-- time of computation at the first point of the added Bezier
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-- curve (i.e. the first point of the Poles table). This will be the
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-- case if the tangent vector of the curve at this point is
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-- parallel to the tangent vector at the end point of the
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-- preceding Bezier curve in the Bezier curve sequence still
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-- contained in this framework. An angular tolerance given at
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-- the time of construction of this framework will be used to
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-- check the parallelism of the two tangent vectors. This
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-- checking procedure and all related computations will be
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-- performed by the Perform function.
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-- When the adjacent Bezier curve sequence is complete, use
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-- the following functions:
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-- - Perform to compute the data needed to build the BSpline curve,
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-- - and the available consultation functions to access the
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-- computed data. This data may be used to construct the BSpline curve.
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-- Warning
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-- The Bezier curve sequence treated by this framework is
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-- automatically initialized with the first Bezier curve when the
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-- function is first called. During subsequent use of this function,
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-- ensure that the first point of the added Bezier curve (i.e. the
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-- first point of the Poles table) is coincident with the last point
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-- of the Bezier curve sequence (i.e. the last point of the
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-- preceding Bezier curve in the sequence) still contained in
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-- this framework. An error may occur at the time of
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-- computation if this condition is not satisfied. Particular care
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-- must be taken with respect to the above, as this condition is
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-- not checked either when defining the Bezier curve
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-- sequence or at the time of computation.
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Perform(me: in out)
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---Purpose: Computes all the data needed to build a BSpline curve
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-- equivalent to the adjacent Bezier curve sequence still
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-- contained in this framework.
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-- A knot is inserted on the computed BSpline curve at the
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-- junction point of two consecutive Bezier curves. The
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-- degree of continuity of the BSpline curve will be increased
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-- at the junction point of two consecutive Bezier curves if
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-- their tangent vectors at this point are parallel. An angular
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-- tolerance given at the time of construction of this
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-- framework is used to check the parallelism of the two
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-- tangent vectors.
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-- Use the available consultation functions to access the
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-- computed data. This data may then be used to construct
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-- the BSpline curve.
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-- Warning
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-- Make sure that the curves in the Bezier curve sequence
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-- contained in this framework are adjacent. An error may
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-- occur at the time of computation if this condition is not
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-- satisfied. Particular care must be taken with respect to the
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-- above as this condition is not checked, either when
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-- defining the Bezier curve sequence or at the time of computation.
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is static;
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Degree(me) returns Integer from Standard
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is static;
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---Purpose: Returns the degree of the BSpline curve whose data is
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-- computed in this framework.
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-- Warning
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-- Take particular care not to use this function before the
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-- computation is performed (Perform function), as this
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-- condition is not checked and an error may therefore occur.
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NbPoles(me) returns Integer from Standard
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is static;
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---Purpose: Returns the number of poles of the BSpline curve whose
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-- data is computed in this framework.
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-- Warning
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-- Take particular care not to use this function before the
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-- computation is performed (Perform function), as this
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-- condition is not checked and an error may therefore occur.
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Poles(me; Poles : in out Array1OfPnt from TColgp)
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is static;
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--- Purpose: Loads the Poles table with the poles of the BSpline curve
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-- whose data is computed in this framework.
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-- Warning
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-- - Do not use this function before the computation is
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-- performed (Perform function).
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-- - The length of the Poles array must be equal to the
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-- number of poles of the BSpline curve whose data is
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-- computed in this framework.
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-- Particular care must be taken with respect to the above, as
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-- these conditions are not checked, and an error may occur.
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NbKnots(me) returns Integer from Standard
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is static;
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---Purpose: Returns the number of knots of the BSpline curve whose
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-- data is computed in this framework.
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-- Warning
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-- Take particular care not to use this function before the
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-- computation is performed (Perform function), as this
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-- condition is not checked and an error may therefore occur.
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KnotsAndMults(me;
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Knots : in out Array1OfReal from TColStd;
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Mults : in out Array1OfInteger from TColStd)
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is static;
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---Purpose:
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-- - loads the Knots table with the knots,
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-- - and loads the Mults table with the corresponding multiplicities
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-- of the BSpline curve whose data is computed in this framework.
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-- Warning
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-- - Do not use this function before the computation is
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-- performed (Perform function).
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-- - The length of the Knots and Mults arrays must be equal
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-- to the number of knots in the BSpline curve whose data is
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-- computed in this framework.
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-- Particular care must be taken with respect to the above as
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-- these conditions are not checked, and an error may occur.
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fields
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mySequence : SequenceOfArray1OfPoles from Convert;
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CurvePoles : SequenceOfPnt from TColgp;
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CurveKnots : SequenceOfReal from TColStd;
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KnotsMultiplicities : SequenceOfInteger from TColStd;
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myDegree : Integer from Standard;
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myAngular : Real from Standard;
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myDone : Boolean from Standard;
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end CompBezierCurvesToBSplineCurve;
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