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/* Libart_LGPL - library of basic graphic primitives
* Copyright (C) 1998 Raph Levien
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __ART_AFFINE_H__
#define __ART_AFFINE_H__
#include <libart_lgpl/art_point.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
void
art_affine_point (ArtPoint *dst, const ArtPoint *src,
const gdouble affine[6]);
void
art_affine_invert (gdouble dst_affine[6], const gdouble src_affine[6]);
void
art_affine_multiply (gdouble dst[6],
const gdouble src1[6], const gdouble src2[6]);
/* set up the identity matrix */
void
art_affine_identity (gdouble dst[6]);
/* set up a scaling matrix */
void
art_affine_scale (gdouble dst[6], gdouble sx, gdouble sy);
/* set up a translation matrix */
void
art_affine_translate (gdouble dst[6], gdouble tx, gdouble ty);
/* find the affine's "expansion factor", i.e. the scale amount */
gdouble
art_affine_expansion (const gdouble src[6]);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __ART_AFFINE_H__ */
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