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1 | // Created on: 2014-10-15 |
2 | // Created by: Denis Bogolepov |
3 | // Copyright (c) 2014 OPEN CASCADE SAS |
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 <OpenGl_Cylinder.hxx> |
17 | |
18 | // ======================================================================= |
19 | // function : OpenGl_Cylinder |
20 | // purpose : |
21 | // ======================================================================= |
22 | OpenGl_Cylinder::OpenGl_Cylinder() |
23 | : myBotRad (1.0f), |
24 | myTopRad (1.0f), |
25 | myHeight (1.0f) |
26 | { |
27 | // |
28 | } |
29 | |
30 | // ======================================================================= |
31 | // function : Init |
32 | // purpose : |
33 | // ======================================================================= |
34 | Standard_Boolean OpenGl_Cylinder::Init (const Standard_ShortReal theBotRad, |
35 | const Standard_ShortReal theTopRad, |
36 | const Standard_ShortReal theHeight, |
37 | const Standard_Integer theNbSlices, |
38 | const Standard_Integer theNbStacks) |
39 | { |
40 | myBotRad = theBotRad; |
41 | myTopRad = theTopRad; |
42 | myHeight = theHeight; |
43 | return OpenGl_Quadric::init (theNbSlices, theNbStacks); |
44 | } |
45 | |
46 | // ======================================================================= |
47 | // function : evalVertex |
48 | // purpose : |
49 | // ======================================================================= |
50 | OpenGl_Vec3 OpenGl_Cylinder::evalVertex (const Standard_ShortReal theU, |
51 | const Standard_ShortReal theV) const |
52 | { |
53 | const Standard_ShortReal aU = static_cast<Standard_ShortReal> (theU * M_PI * 2.0); |
54 | const Standard_ShortReal aRadius = myBotRad + (myTopRad - myBotRad) * theV; |
55 | return OpenGl_Vec3 (cosf (aU) * aRadius, |
56 | sinf (aU) * aRadius, |
57 | theV * myHeight); |
58 | } |
59 | |
60 | // ======================================================================= |
61 | // function : evalNormal |
62 | // purpose : |
63 | // ======================================================================= |
64 | OpenGl_Vec3 OpenGl_Cylinder::evalNormal (const Standard_ShortReal theU, |
65 | const Standard_ShortReal /*theV*/) const |
66 | { |
67 | const Standard_ShortReal aU = static_cast<Standard_ShortReal> (theU * M_PI * 2.0); |
68 | return OpenGl_Vec3 (cosf (aU) * myHeight, |
69 | sinf (aU) * myHeight, |
70 | myBotRad - myTopRad).Normalized(); |
71 | } |