/* * affine.h -- Affine Transforms for 2d objects * Copyright (C) 2002 Charles Yates <charles.yates@pandora.be> * * 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. */#ifndef _AFFINE_H#define _AFFINE_H#include <math.h>/** Affine transforms for 2d image manipulation. Current provides shearing and 	rotating support.*/typedef struct {	double matrix[2][2];} affine_transform_t;void affine_transform_init( affine_transform_t *this );void affine_transform_rotate( affine_transform_t *this, double angle );void affine_transform_shear( affine_transform_t *this, double shear );void affine_transform_scale( affine_transform_t *this, double sx, double sy );double affine_transform_mapx( affine_transform_t *this, int x, int y );double affine_transform_mapy( affine_transform_t *this, int x, int y );#endif