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/////////////////////////////////////////////////////////////
// Flash Plugin and Player
// Copyright (C) 1998,1999 Olivier Debon
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
///////////////////////////////////////////////////////////////
// Author : Olivier Debon <odebon@club-internet.fr>
//
#include "matrix.h"
#ifdef RCSID
static char *rcsid = "$Id$";
#endif
Matrix::Matrix()
{
a = 1.0;
d = 1.0;
b = c = 0.0;
tx = ty = 0;
}
Matrix Matrix::operator*(Matrix m)
{
Matrix mat;
mat.a = this->a * m.a + this->b * m.c;
mat.b = this->a * m.b + this->b * m.d;
mat.c = this->c * m.a + this->d * m.c;
mat.d = this->c * m.b + this->d * m.d;
mat.tx = this->getX(m.tx,m.ty);
mat.ty = this->getY(m.tx,m.ty);
return mat;
}
Matrix Matrix::invert()
{
Matrix mat;
float det;
det = a*d-b*c;
mat.a = d/det;
mat.b = -b/det;
mat.c = -c/det;
mat.d = a/det;
mat.tx = - (long)(mat.a * tx + mat.b * ty);
mat.ty = - (long)(mat.c * tx + mat.d * ty);
return mat;
}
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