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d5f74e42d6
License statement text corrected; compiler warnings caused by Bison 2.41 disabled for MSVC; a few other compiler warnings on 54-bit Windows eliminated by appropriate type cast Wrong license statements corrected in several files. Copyright and license statements added in XSD and GLSL files. Copyright year updated in some files. Obsolete documentation files removed from DrawResources.
190 lines
6.4 KiB
C++
190 lines
6.4 KiB
C++
// Created on: 2001-12-20
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// Created by: Pavel TELKOV
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// Copyright (c) 2001-2014 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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// Last modification:
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#include <ShapeCustom_Curve2d.ixx>
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#include <Standard_ErrorHandler.hxx>
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#include <gp_Vec2d.hxx>
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#include <gp_Dir2d.hxx>
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#include <gp_Lin2d.hxx>
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#include <gp_Pnt2d.hxx>
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#include <ElCLib.hxx>
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#include <Precision.hxx>
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#include <Geom2d_BSplineCurve.hxx>
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#include <Geom2d_BezierCurve.hxx>
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//=======================================================================
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//function : GetLine
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//purpose : static
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//=======================================================================
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static gp_Lin2d GetLine (const gp_Pnt2d& P1, const gp_Pnt2d& P2,
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const Standard_Real c1, Standard_Real& cf, Standard_Real& cl)
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{
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gp_Vec2d avec (P1,P2);
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gp_Dir2d adir (avec);
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gp_Lin2d alin (P1,adir);
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alin.SetLocation (ElCLib::Value (c1, alin));
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cf = ElCLib::Parameter (alin, P1);
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cl = ElCLib::Parameter (alin, P2);
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return alin;
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}
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//=======================================================================
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//function : IsLinear
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//purpose : static
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//=======================================================================
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Standard_Boolean ShapeCustom_Curve2d::IsLinear(const TColgp_Array1OfPnt2d& thePoles,
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const Standard_Real tolerance,
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Standard_Real& Deviation)
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{
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Standard_Integer nbPoles = thePoles.Length();
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if(nbPoles < 2)
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return Standard_False;
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Standard_Real dMax = 0;
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Standard_Integer iMax1=0,iMax2=0;
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Standard_Integer i;
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for(i = 1; i < nbPoles; i++)
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for(Standard_Integer j = i+1; j <= nbPoles; j++) {
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Standard_Real dist = thePoles(i).SquareDistance(thePoles(j));
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if(dist > dMax) {
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dMax = dist;
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iMax1 = i;
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iMax2 = j;
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}
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}
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Standard_Real dPreci = Precision::PConfusion()*Precision::PConfusion();
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if(dMax < dPreci)
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return Standard_False;
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Standard_Real tol2 = tolerance*tolerance;
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gp_Vec2d avec (thePoles(iMax1),thePoles(iMax2));
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gp_Dir2d adir (avec);
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gp_Lin2d alin (thePoles(iMax1),adir);
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Standard_Real aMax = 0.;
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for(i = 1; i <= nbPoles; i++) {
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Standard_Real dist = alin.SquareDistance(thePoles(i));
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if(dist > tol2)
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return Standard_False;
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if(dist > aMax)
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aMax = dist;
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}
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Deviation = sqrt(aMax);
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return Standard_True;
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}
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//=======================================================================
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//function : ConvertToLine2d
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//purpose : static
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//=======================================================================
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Handle(Geom2d_Line) ShapeCustom_Curve2d::ConvertToLine2d (const Handle(Geom2d_Curve)& theCurve,
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const Standard_Real c1,
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const Standard_Real c2,
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const Standard_Real theTolerance,
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Standard_Real& cf,
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Standard_Real& cl,
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Standard_Real& theDeviation)
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{
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Handle(Geom2d_Line) aLine2d;
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gp_Pnt2d P1 = theCurve->Value(c1);
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gp_Pnt2d P2 = theCurve->Value(c2);
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Standard_Real dPreci = theTolerance*theTolerance;
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if(P1.SquareDistance(P2) < dPreci)
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return aLine2d; // it is not a line
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Handle(Geom2d_BSplineCurve) bsc = Handle(Geom2d_BSplineCurve)::DownCast(theCurve);
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if (!bsc.IsNull()) {
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Standard_Integer nbPoles = bsc->NbPoles();
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TColgp_Array1OfPnt2d Poles(1,nbPoles);
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bsc->Poles(Poles);
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if(!ShapeCustom_Curve2d::IsLinear(Poles,theTolerance,theDeviation))
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return aLine2d; // non
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gp_Lin2d alin = GetLine (P1,P2,c1,cf,cl);
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aLine2d = new Geom2d_Line (alin);
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return aLine2d;
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}
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Handle(Geom2d_BezierCurve) bzc = Handle(Geom2d_BezierCurve)::DownCast(theCurve);
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if (!bzc.IsNull()) {
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Standard_Integer nbPoles = bzc->NbPoles();
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TColgp_Array1OfPnt2d Poles(1,nbPoles);
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bzc->Poles(Poles);
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if(!ShapeCustom_Curve2d::IsLinear(Poles,theTolerance,theDeviation))
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return aLine2d; // non
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gp_Lin2d alin = GetLine (P1,P2,c1,cf,cl);
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aLine2d = new Geom2d_Line (alin);
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return aLine2d;
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}
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return aLine2d;
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}
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//=======================================================================
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//function : SimplifyBSpline2d
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//purpose :
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//=======================================================================
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Standard_Boolean ShapeCustom_Curve2d::SimplifyBSpline2d (Handle(Geom2d_BSplineCurve)& theBSpline2d,
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const Standard_Real theTolerance)
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{
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Standard_Integer aInitNbK;
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Standard_Integer NbK = aInitNbK = theBSpline2d->NbKnots();
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// search knot to remove
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Standard_Boolean IsToRemove = Standard_True;
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Standard_Integer aKnotIndx = NbK-1;
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while (IsToRemove && NbK > 2)
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{
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Standard_Integer aMult = theBSpline2d->Multiplicity(aKnotIndx);
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Standard_Integer DegMult = theBSpline2d->Degree() - aMult;
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if ((DegMult > 1) && theBSpline2d->IsCN(DegMult))
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{
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Standard_Real U = theBSpline2d->Knot(aKnotIndx);
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gp_Vec2d aVec1 = theBSpline2d->LocalDN(U, aKnotIndx-1, aKnotIndx, DegMult);
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gp_Vec2d aVec2 = theBSpline2d->LocalDN(U, aKnotIndx, aKnotIndx+1, DegMult);
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// check the derivations are have the "same" angle
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if (aVec1.IsParallel(aVec2, Precision::Angular()))
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{
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// remove knot
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try
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{
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OCC_CATCH_SIGNALS
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theBSpline2d->RemoveKnot(aKnotIndx,
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aMult-1,
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theTolerance);
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}
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catch(Standard_Failure)
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{
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}
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}
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}
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aKnotIndx--;
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NbK = theBSpline2d->NbKnots();
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if (aKnotIndx == 1 || aKnotIndx == NbK)
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IsToRemove = Standard_False;
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}
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return (aInitNbK > NbK);
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}
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