matrix.h

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00001 /* Copyright (C) 2008 Jonathon Jongsma
00002  *
00003  * This library is free software; you can redistribute it and/or
00004  * modify it under the terms of the GNU Library General Public
00005  * License as published by the Free Software Foundation; either
00006  * version 2 of the License, or (at your option) any later version.
00007  *
00008  * This library is distributed in the hope that it will be useful,
00009  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00010  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00011  * Library General Public License for more details.
00012  *
00013  * You should have received a copy of the GNU Library General Public
00014  * License along with this library; if not, write to the Free Software
00015  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
00016  * 02110-1301, USA.
00017  */
00018 #ifndef __CAIROMM_MATRIX_H
00019 #define __CAIROMM_MATRIX_H
00020 
00021 #include <cairo.h>
00022 
00023 namespace Cairo
00024 {
00025 
00050 class Matrix : public cairo_matrix_t
00051 {
00052 public:
00063   Matrix();
00064 
00080   Matrix(double xx, double yx, double xy, double yy, double x0, double y0);
00081 
00089   void translate(double tx, double ty);
00090 
00098   void scale(double sx, double sy);
00099 
00109   void rotate(double radians);
00110 
00116   void invert(); // throws exception
00117 
00130   void multiply(Matrix& a, Matrix& b);
00131 
00150   void transform_distance(double& dx, double& dy) const;
00151 
00157   void transform_point(double& x, double& y) const;
00158 };
00159 
00164 Matrix identity_matrix();
00165 
00174 Matrix translation_matrix(double tx, double ty);
00175 
00184 Matrix scaling_matrix(double sx, double sy);
00185 
00195 Matrix rotation_matrix(double radians);
00196 
00209 Matrix operator*(const Matrix& a, const Matrix& b);
00210 
00211 } // namespace Cairo
00212 
00213 #endif // __CAIROMM_MATRIX_H

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