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/*
* Transfo.h -- Header for common geometric routines.
*
* Authors : Patrick Lecoanet.
* Creation date :
*
* $Id$
*/
/*
* Copyright (c) 1993 - 1999 CENA, Patrick Lecoanet --
*
* This code 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 code 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 code; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifndef _Transfo_h
#define _Transfo_h
#include "Types.h"
#include <math.h>
#include <limits.h>
/*
* First subscript is matrix row, second is matrix column.
* So a[0][1] is upper right corner of matrix a and a[2][0]
* is lower left corner.
*/
typedef struct _ZnTransfo {
float _[3][2];
} ZnTransfo;
ZnTransfo *
ZnTransfoNew(void);
ZnTransfo *
ZnTransfoDuplicate(ZnTransfo *t);
void
ZnTransfoFree(ZnTransfo *t);
void
ZnPrintTransfo(ZnTransfo *t);
void
ZnTransfoSetIdentity(ZnTransfo *t);
ZnBool
ZnTransfoIsIdentity(ZnTransfo *t);
ZnTransfo *
ZnTransfoCompose(ZnTransfo *res,
ZnTransfo *t1,
ZnTransfo *t2);
ZnTransfo *
ZnTransfoInvert(ZnTransfo *t,
ZnTransfo *inv);
void
ZnTransfoDecompose(ZnTransfo *t,
ZnPoint *scale,
ZnPoint *trans,
ZnReal *rotation,
ZnReal *skewxy);
ZnBool
ZnTransfoEqual(ZnTransfo *t1,
ZnTransfo *t2,
ZnBool include_translation);
ZnBool
ZnTransfoHasSkew(ZnTransfo *t);
ZnBool
ZnTransfoIsTranslation(ZnTransfo *t);
ZnPoint *
ZnTransformPoint(ZnTransfo *t,
ZnPoint *p,
ZnPoint *xp);
void
ZnTransformPoints(ZnTransfo *t,
ZnPoint *p,
ZnPoint *xp,
unsigned int num);
ZnTransfo *
ZnTranslate(ZnTransfo *t,
ZnReal delta_x,
ZnReal delta_y,
ZnBool abs);
ZnTransfo *
ZnScale(ZnTransfo *t,
ZnReal scale_x,
ZnReal scale_y);
ZnTransfo *
ZnRotateRad(ZnTransfo *t,
ZnReal angle);
ZnTransfo *
ZnRotateDeg(ZnTransfo *t,
ZnReal angle);
ZnTransfo *
ZnSkewRad(ZnTransfo *t,
ZnReal skew_x,
ZnReal skew_y);
ZnTransfo *
ZnSkewDeg(ZnTransfo *t,
ZnReal skew_x,
ZnReal skew_y);
#endif /* _Transfo_h */
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