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1 | // Created on: 2014-01-10 |
2 | // Created by: Denis BOGOLEPOV |
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3 | // Copyright (c) 2013-2014 OPEN CASCADE SAS |
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4 | // |
5 | // This file is part of Open CASCADE Technology software library. |
6 | // |
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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 |
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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 | // ======================================================================= |
17 | // function : Perform |
18 | // purpose : |
19 | // ======================================================================= |
20 | template<class T, int N> |
21 | void BVH_Sorter<T, N>::Perform (BVH_Set<T, N>* theSet, |
22 | const Standard_Integer theAxis) |
23 | { |
24 | Perform (theSet, theAxis, 0, theSet->Size() - 1); |
25 | } |
26 | |
27 | // ======================================================================= |
28 | // function : Perform |
29 | // purpose : |
30 | // ======================================================================= |
31 | template<class T, int N> |
32 | void BVH_Sorter<T, N>::Perform (BVH_Set<T, N>* theSet, |
33 | const Standard_Integer theAxis, |
34 | const Standard_Integer theBegElement, |
35 | const Standard_Integer theEndElement) |
36 | { |
37 | Standard_Integer aLft = theBegElement; |
38 | Standard_Integer aRgh = theEndElement; |
39 | |
40 | T aPivot = theSet->Center ((aRgh + aLft) / 2, theAxis); |
41 | |
42 | while (aLft < aRgh) |
43 | { |
44 | while (theSet->Center (aLft, theAxis) < aPivot && aLft < theEndElement) |
45 | { |
46 | ++aLft; |
47 | } |
48 | |
49 | while (theSet->Center (aRgh, theAxis) > aPivot && aRgh > theBegElement) |
50 | { |
51 | --aRgh; |
52 | } |
53 | |
54 | if (aLft <= aRgh) |
55 | { |
56 | if (aLft != aRgh) |
57 | { |
58 | theSet->Swap (aLft, aRgh); |
59 | } |
60 | |
61 | ++aLft; |
62 | --aRgh; |
63 | } |
64 | } |
65 | |
66 | if (aRgh > theBegElement) |
67 | { |
68 | Perform (theSet, theAxis, theBegElement, aRgh); |
69 | } |
70 | |
71 | if (aLft < theEndElement) |
72 | { |
73 | Perform (theSet, theAxis, aLft, theEndElement); |
74 | } |
75 | } |