/* This file is part of GEGL
*
* GEGL is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* GEGL 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GEGL; if not, see .
*
* Copyright 2006 Dominik Ernst
*
* Reflect an image about a line, whose direction is specified by the
* vector that is defined by the x and y properties.
*/
#include "config.h"
#include
#ifdef GEGL_CHANT_PROPERTIES
gegl_chant_double (x, -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
_("Direction vector's X component"))
gegl_chant_double (y, -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
_("Direction vector's Y component"))
#else
#define GEGL_CHANT_NAME reflect
#define GEGL_CHANT_SELF "reflect.c"
#include "chant.h"
#include
static void
create_matrix (OpTransform *op,
GeglMatrix3 *matrix)
{
GeglChantOperation *chant = GEGL_CHANT_OPERATION (op);
gdouble ux = 0, uy = 0;
gdouble l;
ux = chant->x;
uy = chant->y;
l = sqrt(uy*uy + ux*ux);
ux /= l;
uy /= l;
matrix->coeff [0][0] = 2*ux*ux - 1;
matrix->coeff [1][1] = 2*uy*uy - 1;
matrix->coeff [0][1] = matrix->coeff [1][0] = 2*ux*uy;
}
#endif