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052c37669b
- Implementation of hashers for analytic curves (Line, Circle, Ellipse, Hyperbola, Parabola) and freeform curves (Bezier, BSpline, Trimmed, Offset) in both 2D and 3D - Implementation of hashers for surfaces including elementary surfaces (Plane, Cylinder, Cone, Sphere, Torus) and derived surfaces (Revolution, LinearExtrusion, RectangularTrimmed, Offset) - Comprehensive test coverage for all hasher implementations
48 lines
1.8 KiB
Plaintext
48 lines
1.8 KiB
Plaintext
// Copyright (c) 2025 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 _Geom2dHash_PointHasher_HeaderFile
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#define _Geom2dHash_PointHasher_HeaderFile
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#include <Standard_HashUtils.hxx>
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#include <gp_Pnt2d.hxx>
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#include <cmath>
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//! OCCT-style hasher for gp_Pnt2d (2D points).
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//! Used for geometry deduplication.
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struct Geom2dHash_PointHasher
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{
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// Hashes the 2D point by its XY coordinates.
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std::size_t operator()(const gp_Pnt2d& thePoint) const noexcept
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{
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constexpr double aTolerance = 1e-12;
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constexpr double aFactor = 1.0 / aTolerance;
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// Round each coordinate to tolerance precision before hashing
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const std::size_t aHashes[2] = {
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opencascade::hash(static_cast<int64_t>(std::round(thePoint.X() * aFactor))),
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opencascade::hash(static_cast<int64_t>(std::round(thePoint.Y() * aFactor)))};
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return opencascade::hashBytes(aHashes, sizeof(aHashes));
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}
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// Compares two 2D points with fixed tolerance.
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bool operator()(const gp_Pnt2d& thePoint1, const gp_Pnt2d& thePoint2) const noexcept
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{
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constexpr double aTolerance = 1e-12;
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return std::abs(thePoint1.X() - thePoint2.X()) <= aTolerance
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&& std::abs(thePoint1.Y() - thePoint2.Y()) <= aTolerance;
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}
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};
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#endif // _Geom2dHash_PointHasher_HeaderFile
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