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98 lines
3.7 KiB
C++
98 lines
3.7 KiB
C++
// Created on: 1995-07-27
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// Created by: Modelistation
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// Copyright (c) 1995-1999 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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#include <Adaptor3d_Surface.hxx>
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#include <gp_Pnt.hxx>
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#include <gp_Vec.hxx>
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#include <Graphic3d_ArrayOfTriangleStrips.hxx>
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#include <Graphic3d_Group.hxx>
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#include <Precision.hxx>
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#include <Prs3d_IsoAspect.hxx>
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#include <Prs3d_ShadingAspect.hxx>
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#include <StdPrs_ShadedSurface.hxx>
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#include <TColStd_Array1OfReal.hxx>
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//=======================================================================
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//function : Add
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//purpose :
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//=======================================================================
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void StdPrs_ShadedSurface::Add (const Handle(Prs3d_Presentation)& thePrs,
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const Adaptor3d_Surface& theSurface,
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const Handle(Prs3d_Drawer)& theDrawer)
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{
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Standard_Integer N1 = theDrawer->UIsoAspect()->Number();
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Standard_Integer N2 = theDrawer->VIsoAspect()->Number();
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N1 = N1 < 3 ? 3 : N1;
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N2 = N2 < 3 ? 3 : N2;
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// If the surface is closed, the faces from back-side are not traced:
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Handle(Graphic3d_Group) aGroup = thePrs->CurrentGroup();
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aGroup->SetGroupPrimitivesAspect (theDrawer->ShadingAspect()->Aspect());
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aGroup->SetClosed (theSurface.IsUClosed() && theSurface.IsVClosed());
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Standard_Integer aNBUintv = theSurface.NbUIntervals (GeomAbs_C1);
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Standard_Integer aNBVintv = theSurface.NbVIntervals (GeomAbs_C1);
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TColStd_Array1OfReal anInterU (1, aNBUintv + 1);
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TColStd_Array1OfReal anInterV (1, aNBVintv + 1);
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theSurface.UIntervals (anInterU, GeomAbs_C1);
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theSurface.VIntervals (anInterV, GeomAbs_C1);
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Standard_Real U1, U2, V1, V2, DU, DV;
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gp_Pnt P1, P2;
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gp_Vec D1U, D1V, D1, D2;
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for (Standard_Integer NU = 1; NU <= aNBUintv; ++NU)
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{
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for (Standard_Integer NV = 1; NV <= aNBVintv; ++NV)
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{
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U1 = anInterU (NU); U2 = anInterU (NU + 1);
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V1 = anInterV (NV); V2 = anInterV (NV + 1);
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U1 = (Precision::IsNegativeInfinite (U1)) ? - theDrawer->MaximalParameterValue() : U1;
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U2 = (Precision::IsPositiveInfinite (U2)) ? theDrawer->MaximalParameterValue() : U2;
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V1 = (Precision::IsNegativeInfinite (V1)) ? - theDrawer->MaximalParameterValue() : V1;
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V2 = (Precision::IsPositiveInfinite (V2)) ? theDrawer->MaximalParameterValue() : V2;
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DU = (U2 - U1) / N1;
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DV = (V2 - V1) / N2;
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Handle(Graphic3d_ArrayOfTriangleStrips) aPArray
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= new Graphic3d_ArrayOfTriangleStrips (2 * (N1 + 1) * (N2 + 1), N1 + 1,
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Standard_True, Standard_False, Standard_False, Standard_False);
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for (Standard_Integer i = 1; i <= N1 + 1; ++i)
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{
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aPArray->AddBound (N2 + 1);
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for (Standard_Integer j = 1; j <= N2 + 1; ++j)
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{
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theSurface.D1 (U1 + DU * (i - 1), V1 + DV * (j - 1), P2, D1U, D1V);
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D1 = D1U ^ D1V;
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D1.Normalize();
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theSurface.D1 (U1 + DU * i, V1 + DV * (j - 1), P2, D1U, D1V);
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D2 = D1U ^ D1V;
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D2.Normalize();
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aPArray->AddVertex (P1, D1);
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aPArray->AddVertex (P2, D2);
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}
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}
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aGroup->AddPrimitiveArray (aPArray);
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}
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}
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}
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