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94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/* Libart_LGPL - library of basic graphic primitives
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* Copyright (C) 1998 Raph Levien
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __ART_AFFINE_H__
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#define __ART_AFFINE_H__
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#ifdef LIBART_COMPILATION
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#include "art_point.h"
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#else
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#include <libart_lgpl/art_point.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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void
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art_affine_point (ArtPoint *dst, const ArtPoint *src,
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const double affine[6]);
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void
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art_affine_invert (double dst_affine[6], const double src_affine[6]);
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/* flip the matrix, FALSE, FALSE is a simple copy operation, and
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TRUE, TRUE equals a rotation by 180 degrees */
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void
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art_affine_flip (double dst_affine[6], const double src_affine[6],
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int horz, int vert);
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void
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art_affine_to_string (char str[128], const double src[6]);
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void
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art_affine_multiply (double dst[6],
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const double src1[6], const double src2[6]);
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/* set up the identity matrix */
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void
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art_affine_identity (double dst[6]);
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/* set up a scaling matrix */
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void
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art_affine_scale (double dst[6], double sx, double sy);
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/* set up a rotation matrix; theta is given in degrees */
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void
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art_affine_rotate (double dst[6], double theta);
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/* set up a shearing matrix; theta is given in degrees */
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void
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art_affine_shear (double dst[6], double theta);
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/* set up a translation matrix */
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void
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art_affine_translate (double dst[6], double tx, double ty);
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/* find the affine's "expansion factor", i.e. the scale amount */
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double
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art_affine_expansion (const double src[6]);
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/* Determine whether the affine transformation is rectilinear,
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i.e. whether a rectangle aligned to the grid is transformed into
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another rectangle aligned to the grid. */
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int
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art_affine_rectilinear (const double src[6]);
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/* Determine whether two affine transformations are equal within grid allignment */
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int
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art_affine_equal (double matrix1[6], double matrix2[6]);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __ART_AFFINE_H__ */
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