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137 lines
4.9 KiB
Plaintext
Executable File
137 lines
4.9 KiB
Plaintext
Executable File
// Created on: 2008-12-28
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// Created by: Roman Lygin
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// Copyright (c) 2008-2012 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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// roman.lygin@gmail.com
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#include <Precision.hxx>
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//=======================================================================
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//function : Extrema_CurveCache
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//purpose :
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//=======================================================================
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Extrema_CurveCache::Extrema_CurveCache(const Curve& theC,
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const Standard_Real theUFirst,
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const Standard_Real theULast,
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const Standard_Integer theNbSamples,
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const Standard_Boolean theToCalculate) :
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myC (0), myNbSamples (-1), myIsArrayValid (Standard_False)
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{
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SetCurve (theC, theUFirst, theULast, theNbSamples, theToCalculate);
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}
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//=======================================================================
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//function : Extrema_CurveCache
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//purpose :
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//=======================================================================
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Extrema_CurveCache::Extrema_CurveCache() : myC (0), myNbSamples (-1),
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myIsArrayValid (Standard_False)
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{
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}
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//=======================================================================
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//function : SetCurve
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//purpose :
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//=======================================================================
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void Extrema_CurveCache::SetCurve (const Curve& theC,
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const Standard_Integer theNbSamples,
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const Standard_Boolean theToCalculate)
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{
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myC = (Standard_Address)&theC;
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myNbSamples = theNbSamples;
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myIsArrayValid = Standard_False;
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myPntArray.Nullify();
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if (theToCalculate) {
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CalculatePoints();
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}
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}
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//=======================================================================
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//function : SetCurve
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//purpose :
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//=======================================================================
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void Extrema_CurveCache::SetCurve (const Curve& theC,
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const Standard_Real theUFirst,
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const Standard_Real theULast,
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const Standard_Integer theNbSamples,
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const Standard_Boolean theToCalculate)
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{
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SetCurve (theC, theNbSamples, Standard_False); //no calculation
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SetRange (theUFirst, theULast, theToCalculate);
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}
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//=======================================================================
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//function : SetRange
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//purpose :
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//=======================================================================
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void Extrema_CurveCache::SetRange (const Standard_Real theUFirst,
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const Standard_Real theULast,
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const Standard_Boolean theToCalculate)
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{
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//myTrimFirst and myTrimLast are used to compute values on unlimited curves
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myTrimFirst = myFirst = theUFirst;
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if (Precision::IsInfinite(myTrimFirst)){
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myTrimFirst = -1.0e+10;
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}
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myTrimLast = myLast = theULast;
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if (Precision::IsInfinite(myTrimLast)){
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myTrimLast = 1.0e+10;
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}
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myIsArrayValid = Standard_False;
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myPntArray.Nullify();
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if (theToCalculate) {
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CalculatePoints();
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}
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}
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//=======================================================================
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//function : CalculatePoints
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//purpose :
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//=======================================================================
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void Extrema_CurveCache::CalculatePoints()
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{
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if (myIsArrayValid) return; //no need to recalculate if nothing has changed
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const Curve& aCurve = *((Curve*)myC);
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// compute myNbSamples point along the [myTrimFirst, myTrimLast] range
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Standard_Real aDelta = myTrimLast - myTrimFirst;
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Standard_Real aPar0 = aDelta / myNbSamples / 100.;
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aDelta = (aDelta - aPar0) / (myNbSamples - 1);
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aPar0 = myTrimFirst + (aPar0/2.);
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//Cache points
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myPntArray = new ArrayOfPnt (1, myNbSamples);
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Standard_Integer i;
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Standard_Real aPar;
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for (i = 1, aPar = aPar0; i <= myNbSamples; i++, aPar += aDelta) {
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myPntArray->SetValue (i, aCurve.Value (aPar));
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}
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myIsArrayValid = Standard_True; //cache is available now
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}
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