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matrix2.h
Go to the documentation of this file.00001 /* 00002 Copyright (C) 2000 by Jorrit Tyberghein 00003 Largely rewritten by Ivan Avramovic <ivan@avramovic.com> 00004 00005 This library is free software; you can redistribute it and/or 00006 modify it under the terms of the GNU Library General Public 00007 License as published by the Free Software Foundation; either 00008 version 2 of the License, or (at your option) any later version. 00009 00010 This library is distributed in the hope that it will be useful, 00011 but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00013 Library General Public License for more details. 00014 00015 You should have received a copy of the GNU Library General Public 00016 License along with this library; if not, write to the Free 00017 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00018 */ 00019 00020 #ifndef __CS_MATRIX2_H__ 00021 #define __CS_MATRIX2_H__ 00022 00023 #include "csextern.h" 00024 00025 #include "csgeom/vector2.h" 00026 00036 class CS_CRYSTALSPACE_EXPORT csMatrix2 00037 { 00038 public: 00039 float m11, m12; 00040 float m21, m22; 00041 00042 public: 00044 csMatrix2 (); 00045 00047 csMatrix2 (float m11, float m12, 00048 float m21, float m22); 00049 00051 inline csVector2 Row1() const { return csVector2 (m11,m12); } 00052 00054 inline csVector2 Row2() const { return csVector2 (m21,m22); } 00055 00057 inline csVector2 Col1() const { return csVector2 (m11,m21); } 00058 00060 inline csVector2 Col2() const { return csVector2 (m12,m22); } 00061 00063 inline void Set (float m11, float m12, 00064 float m21, float m22) 00065 { 00066 csMatrix2::m11 = m11; csMatrix2::m12 = m12; 00067 csMatrix2::m21 = m21; csMatrix2::m22 = m22; 00068 } 00069 00071 csMatrix2& operator+= (const csMatrix2& m); 00072 00074 csMatrix2& operator-= (const csMatrix2& m); 00075 00077 csMatrix2& operator*= (const csMatrix2& m); 00078 00080 csMatrix2& operator*= (float s); 00081 00083 csMatrix2& operator/= (float s); 00084 00086 inline csMatrix2 operator+ () const { return *this; } 00088 inline csMatrix2 operator- () const 00089 { 00090 return csMatrix2(-m11,-m12, -m21,-m22); 00091 } 00092 00094 void Transpose (); 00095 00097 csMatrix2 GetTranspose () const; 00098 00100 inline csMatrix2 GetInverse () const 00101 { 00102 float inv_det = 1 / (m11 * m22 - m12 * m21); 00103 return csMatrix2 (m22 * inv_det, -m12 * inv_det, -m21 * inv_det, m11 * inv_det); 00104 } 00105 00107 void Invert () { *this = GetInverse (); } 00108 00110 float Determinant () const; 00111 00113 void Identity (); 00114 00116 friend csMatrix2 operator+ (const csMatrix2& m1, const csMatrix2& m2); 00118 friend csMatrix2 operator- (const csMatrix2& m1, const csMatrix2& m2); 00120 friend csMatrix2 operator* (const csMatrix2& m1, const csMatrix2& m2); 00121 00123 inline friend csVector2 operator* (const csMatrix2& m, const csVector2& v) 00124 { 00125 return csVector2 (m.m11*v.x + m.m12*v.y, m.m21*v.x + m.m22*v.y); 00126 } 00127 00129 friend csMatrix2 operator* (const csMatrix2& m, float f); 00131 friend csMatrix2 operator* (float f, const csMatrix2& m); 00133 friend csMatrix2 operator/ (const csMatrix2& m, float f); 00134 }; 00135 00138 #endif // __CS_MATRIX2_H__ 00139
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