csgeom/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 "csgeom/vector2.h" 00024 00034 class csMatrix2 00035 { 00036 public: 00037 float m11, m12; 00038 float m21, m22; 00039 00040 public: 00042 csMatrix2 (); 00043 00045 csMatrix2 (float m11, float m12, 00046 float m21, float m22); 00047 00049 inline csVector2 Row1() const { return csVector2 (m11,m12); } 00050 00052 inline csVector2 Row2() const { return csVector2 (m21,m22); } 00053 00055 inline csVector2 Col1() const { return csVector2 (m11,m21); } 00056 00058 inline csVector2 Col2() const { return csVector2 (m12,m22); } 00059 00061 inline void Set (float m11, float m12, 00062 float m21, float m22) 00063 { 00064 csMatrix2::m11 = m11; csMatrix2::m12 = m12; 00065 csMatrix2::m21 = m21; csMatrix2::m22 = m22; 00066 } 00067 00069 csMatrix2& operator+= (const csMatrix2& m); 00070 00072 csMatrix2& operator-= (const csMatrix2& m); 00073 00075 csMatrix2& operator*= (const csMatrix2& m); 00076 00078 csMatrix2& operator*= (float s); 00079 00081 csMatrix2& operator/= (float s); 00082 00084 inline csMatrix2 operator+ () const { return *this; } 00086 inline csMatrix2 operator- () const 00087 { 00088 return csMatrix2(-m11,-m12, -m21,-m22); 00089 } 00090 00092 void Transpose (); 00093 00095 csMatrix2 GetTranspose () const; 00096 00098 inline csMatrix2 GetInverse () const 00099 { 00100 float inv_det = 1 / (m11 * m22 - m12 * m21); 00101 return csMatrix2 (m22 * inv_det, -m12 * inv_det, -m21 * inv_det, m11 * inv_det); 00102 } 00103 00105 void Invert () { *this = GetInverse (); } 00106 00108 float Determinant () const; 00109 00111 void Identity (); 00112 00114 friend csMatrix2 operator+ (const csMatrix2& m1, const csMatrix2& m2); 00116 friend csMatrix2 operator- (const csMatrix2& m1, const csMatrix2& m2); 00118 friend csMatrix2 operator* (const csMatrix2& m1, const csMatrix2& m2); 00119 00121 inline friend csVector2 operator* (const csMatrix2& m, const csVector2& v) 00122 { 00123 return csVector2 (m.m11*v.x + m.m12*v.y, m.m21*v.x + m.m22*v.y); 00124 } 00125 00127 friend csMatrix2 operator* (const csMatrix2& m, float f); 00129 friend csMatrix2 operator* (float f, const csMatrix2& m); 00131 friend csMatrix2 operator/ (const csMatrix2& m, float f); 00132 }; 00133 00136 #endif // __CS_MATRIX2_H__ 00137
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