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Mostly duplicated comments were removed and missing ones were moved into dedicated class CDL files. Some more duplicated comments were removed from CDL files. Correction of merge
126 lines
5.0 KiB
Plaintext
126 lines
5.0 KiB
Plaintext
-- Created on: 1991-10-03
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-- Copyright (c) 1991-1999 Matra Datavision
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-- Copyright (c) 1999-2014 OPEN CASCADE SAS
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--
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-- This file is part of Open CASCADE Technology software library.
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--
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-- This library is free software; you can redistribute it and/or modify it under
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-- the terms of the GNU Lesser General Public License version 2.1 as published
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-- by the Free Software Foundation, with special exception defined in the file
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-- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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-- distribution for complete text of the license and disclaimer of any warranty.
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--
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-- Alternatively, this file may be used under the terms of Open CASCADE
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-- commercial license or contractual agreement.
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class BSplineCurveKnotSplitting from GeomConvert
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--- Purpose : An algorithm to determine points at which a BSpline
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-- curve should be split in order to obtain arcs of the same continuity.
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-- If you require curves with a minimum continuity for
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-- your computation, it is useful to know the points
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-- between which an arc has a continuity of a given
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-- order. The continuity order is given at the construction time.
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-- For a BSpline curve, the discontinuities are
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-- localized at the knot values. Between two knot values
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-- the BSpline is infinitely and continuously
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-- differentiable. At a given knot, the continuity is equal
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-- to: Degree - Mult, where Degree is the
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-- degree of the BSpline curve and Mult is the multiplicity of the knot.
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-- It is possible to compute the arcs which correspond to
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-- this splitting using the global function
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-- SplitBSplineCurve provided by the package GeomConvert.
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-- A BSplineCurveKnotSplitting object provides a framework for:
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-- - defining the curve to be analyzed and the
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-- required degree of continuity,
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-- - implementing the computation algorithm, and
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-- - consulting the results.
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uses Array1OfInteger from TColStd,
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HArray1OfInteger from TColStd,
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BSplineCurve from Geom
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raises DimensionError from Standard,
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RangeError from Standard
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is
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Create (BasisCurve : BSplineCurve from Geom; ContinuityRange : Integer)
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returns BSplineCurveKnotSplitting
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--- Purpose : Determines points at which the BSpline curve
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-- BasisCurve should be split in order to obtain arcs
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-- with a degree of continuity equal to ContinuityRange.
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-- These points are knot values of BasisCurve. They
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-- are identified by indices in the knots table of BasisCurve.
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-- Use the available interrogation functions to access
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-- computed values, followed by the global function
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-- SplitBSplineCurve (provided by the package GeomConvert) to split the curve.
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-- Exceptions
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-- Standard_RangeError if ContinuityRange is less than zero.
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raises RangeError;
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NbSplits (me) returns Integer is static;
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--- Purpose :Returns the number of points at which the analyzed
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-- BSpline curve should be split, in order to obtain arcs
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-- with the continuity required by this framework.
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-- All these points correspond to knot values. Note that
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-- the first and last points of the curve, which bound the
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-- first and last arcs, are counted among these splitting points.
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Splitting (me; SplitValues : in out Array1OfInteger)
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--- Purpose : Loads the SplitValues table with the split knots
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-- values computed in this framework. Each value in the
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-- table is an index in the knots table of the BSpline
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-- curve analyzed by this algorithm.
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-- The values in SplitValues are given in ascending
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-- order and comprise the indices of the knots which
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-- give the first and last points of the curve. Use two
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-- consecutive values from the table as arguments of the
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-- global function SplitBSplineCurve (provided by the
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-- package GeomConvert) to split the curve.
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-- Exceptions
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-- Standard_DimensionError if the array SplitValues
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-- was not created with the following bounds:
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-- - 1, and
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-- - the number of split points computed in this
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-- framework (as given by the function NbSplits).
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raises DimensionError
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is static;
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SplitValue (me; Index : Integer) returns Integer
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--- Purpose : Returns the split knot of index Index to the split knots
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-- table computed in this framework. The returned value
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-- is an index in the knots table of the BSpline curve
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-- analyzed by this algorithm.
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-- Notes:
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-- - If Index is equal to 1, the corresponding knot
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-- gives the first point of the curve.
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-- - If Index is equal to the number of split knots
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-- computed in this framework, the corresponding
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-- point is the last point of the curve.
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-- Exceptions
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-- Standard_RangeError if Index is less than 1 or
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-- greater than the number of split knots computed in this framework.
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raises RangeError
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is static;
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fields
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splitIndexes : HArray1OfInteger;
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end BSplineCurveKnotSplitting;
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