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1. When computing the iso-lines for the face (*DBRep_IsoBuilder*) prepare the Hatching algorithm with the following elements: a. Trimmed p-curves of edges. The trimming parameters are computed by intersection with p-curves of the neighboring edges. The trimming will be performed only if the intersection point is covered by the tolerance of common vertex. b. 2D segments connecting the p-curves of the neighboring edges. These segments will close the 2D gaps, which are closed in 3D by the tolerance of vertices shared between edges. This will allow trimming correctly the iso-lines passing through such gaps. 2. Implementation of the additional Init() method for WireExplorer algorithm taking UV bounds of the face to avoid their repeated computation when work working with a face having multiple wires. 3. Test cases for the issue.
93 lines
2.8 KiB
C++
93 lines
2.8 KiB
C++
// Created on: 1994-03-25
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// Created by: Jean Marc LACHAUME
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// Copyright (c) 1994-1999 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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#ifndef _DBRep_IsoBuilder_HeaderFile
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#define _DBRep_IsoBuilder_HeaderFile
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#include <Standard.hxx>
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#include <Standard_DefineAlloc.hxx>
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#include <Standard_Handle.hxx>
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#include <Standard_Real.hxx>
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#include <TColStd_Array1OfReal.hxx>
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#include <TColStd_Array1OfInteger.hxx>
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#include <Standard_Integer.hxx>
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#include <Geom2dHatch_Hatcher.hxx>
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#include <NCollection_IndexedDataMap.hxx>
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class TopoDS_Face;
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class DBRep_Face;
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class TopoDS_Shape;
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class TopTools_OrientedShapeMapHasher;
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//! Creation of isoparametric curves.
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class DBRep_IsoBuilder : public Geom2dHatch_Hatcher
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{
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public:
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DEFINE_STANDARD_ALLOC
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//! Creates the builder.
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Standard_EXPORT DBRep_IsoBuilder(const TopoDS_Face& TopologicalFace, const Standard_Real Infinite, const Standard_Integer NbIsos);
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//! Returns the total number of domains.
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Standard_Integer NbDomains() const
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{
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return myNbDom;
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}
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//! Loading of the isoparametric curves in the
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//! Data Structure of a drawable face.
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Standard_EXPORT void LoadIsos (const Handle(DBRep_Face)& Face) const;
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protected:
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typedef NCollection_IndexedDataMap
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<TopoDS_Shape, Handle(Geom2d_Curve), TopTools_OrientedShapeMapHasher>
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DataMapOfEdgePCurve;
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//! Adds to the hatcher the 2D segments connecting the p-curves
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//! of the neighboring edges to close the 2D gaps which are
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//! closed in 3D by the tolerance of vertices shared between edges.
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//! It will allow trimming correctly the iso-lines passing through
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//! such gaps.
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//! The method also trims the intersecting 2D curves of the face,
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//! forbidding the iso-lines beyond the face boundaries.
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Standard_EXPORT void FillGaps(const TopoDS_Face& theFace,
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DataMapOfEdgePCurve& theEdgePCurveMap);
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private:
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Standard_Real myInfinite;
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Standard_Real myUMin;
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Standard_Real myUMax;
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Standard_Real myVMin;
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Standard_Real myVMax;
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TColStd_Array1OfReal myUPrm;
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TColStd_Array1OfInteger myUInd;
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TColStd_Array1OfReal myVPrm;
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TColStd_Array1OfInteger myVInd;
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Standard_Integer myNbDom;
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};
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#endif // _DBRep_IsoBuilder_HeaderFile
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