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# csgeom/matrix2.h

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    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
    00037 class CS_CRYSTALSPACE_EXPORT csMatrix2
    00038 {
    00039 public:
    00040   float m11, m12;
    00041   float m21, m22;
    00042
    00043 public:
    00045   csMatrix2 ();
    00046
    00048   csMatrix2 (float m11, float m12,
    00049              float m21, float m22);
    00050
    00052   inline csVector2 Row1() const { return csVector2 (m11,m12); }
    00053
    00055   inline csVector2 Row2() const { return csVector2 (m21,m22); }
    00056
    00058   inline csVector2 Col1() const { return csVector2 (m11,m21); }
    00059
    00061   inline csVector2 Col2() const { return csVector2 (m12,m22); }
    00062
    00064   inline void Set (float m11, float m12,
    00065                    float m21, float m22)
    00066   {
    00067     csMatrix2::m11 = m11; csMatrix2::m12 = m12;
    00068     csMatrix2::m21 = m21; csMatrix2::m22 = m22;
    00069   }
    00070
    00072   csMatrix2& operator+= (const csMatrix2& m);
    00073
    00075   csMatrix2& operator-= (const csMatrix2& m);
    00076
    00078   csMatrix2& operator*= (const csMatrix2& m);
    00079
    00081   csMatrix2& operator*= (float s);
    00082
    00084   csMatrix2& operator/= (float s);
    00085
    00087   inline csMatrix2 operator+ () const { return *this; }
    00089   inline csMatrix2 operator- () const
    00090   {
    00091     return csMatrix2(-m11,-m12, -m21,-m22);
    00092   }
    00093
    00095   void Transpose ();
    00096
    00098   csMatrix2 GetTranspose () const;
    00099
    00101   inline csMatrix2 GetInverse () const
    00102   {
    00103     float inv_det = 1 / (m11 * m22 - m12 * m21);
    00104     return csMatrix2 (m22 * inv_det, -m12 * inv_det,
    00105                       -m21 * inv_det, m11 * inv_det);
    00106   }
    00107
    00109   void Invert () { *this = GetInverse (); }
    00110
    00112   float Determinant () const;
    00113
    00115   void Identity ();
    00116
    00118   friend csMatrix2 operator+ (const csMatrix2& m1, const csMatrix2& m2);
    00120   friend csMatrix2 operator- (const csMatrix2& m1, const csMatrix2& m2);
    00122   friend csMatrix2 operator* (const csMatrix2& m1, const csMatrix2& m2);
    00123
    00125   inline friend csVector2 operator* (const csMatrix2& m, const csVector2& v)
    00126   {
    00127     return csVector2 (m.m11*v.x + m.m12*v.y, m.m21*v.x + m.m22*v.y);
    00128   }
    00129
    00131   friend csMatrix2 operator* (const csMatrix2& m, float f);
    00133   friend csMatrix2 operator* (float f, const csMatrix2& m);
    00135   friend csMatrix2 operator/ (const csMatrix2& m, float f);
    00136 };
    00137
    00140 #endif // __CS_MATRIX2_H__
    00141