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1 | // Created on: 2016-07-07 |
2 | // Copyright (c) 2016 OPEN CASCADE SAS |
3 | // Created by: Oleg AGASHIN |
4 | // |
5 | // This file is part of Open CASCADE Technology software library. |
6 | // |
7 | // This library is free software; you can redistribute it and/or modify it under |
8 | // the terms of the GNU Lesser General Public License version 2.1 as published |
9 | // by the Free Software Foundation, with special exception defined in the file |
10 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
11 | // distribution for complete text of the license and disclaimer of any warranty. |
12 | // |
13 | // Alternatively, this file may be used under the terms of Open CASCADE |
14 | // commercial license or contractual agreement. |
15 | |
16 | #include <BRepMesh_SphereRangeSplitter.hxx> |
17 | #include <GCPnts_TangentialDeflection.hxx> |
18 | |
19 | //======================================================================= |
20 | // Function: GenerateSurfaceNodes |
21 | // Purpose : |
22 | //======================================================================= |
23 | Handle(IMeshData::ListOfPnt2d) BRepMesh_SphereRangeSplitter::GenerateSurfaceNodes( |
24 | const IMeshTools_Parameters& theParameters) const |
25 | { |
26 | // Calculate parameters for iteration in V direction |
27 | Standard_Real aStep = 0.7 * GCPnts_TangentialDeflection::ArcAngularStep( |
28 | GetDFace()->GetSurface()->Sphere().Radius(), GetDFace()->GetDeflection(), |
29 | theParameters.Angle, theParameters.MinSize); |
30 | |
31 | const std::pair<Standard_Real, Standard_Real>* aRange[2] = { |
32 | &GetRangeV(), |
33 | &GetRangeU() |
34 | }; |
35 | |
36 | std::pair<Standard_Real, Standard_Real> aStepAndOffset[2]; |
37 | computeStep(*aRange[0], aStep, aStepAndOffset[0]); |
38 | computeStep(*aRange[1], aStep, aStepAndOffset[1]); |
39 | |
40 | const Handle(NCollection_IncAllocator) aTmpAlloc = |
41 | new NCollection_IncAllocator(IMeshData::MEMORY_BLOCK_SIZE_HUGE); |
42 | Handle(IMeshData::ListOfPnt2d) aNodes = new IMeshData::ListOfPnt2d(aTmpAlloc); |
43 | |
44 | const Standard_Real aHalfDu = aStepAndOffset[1].first * 0.5; |
45 | Standard_Boolean Shift = Standard_False; |
46 | Standard_Real aPasV = aRange[0]->first + aStepAndOffset[0].first; |
47 | for (; aPasV < aStepAndOffset[0].second; aPasV += aStepAndOffset[0].first) |
48 | { |
49 | Shift = !Shift; |
50 | const Standard_Real d = (Shift) ? aHalfDu : 0.; |
51 | Standard_Real aPasU = aRange[1]->first + d; |
52 | for (; aPasU < aStepAndOffset[1].second; aPasU += aStepAndOffset[1].first) |
53 | { |
54 | aNodes->Append(gp_Pnt2d(aPasU, aPasV)); |
55 | } |
56 | } |
57 | |
58 | return aNodes; |
59 | } |