Blame operations/transform/rotate.c

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/* This file is part of GEGL
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 *
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 * GEGL is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 3 of the License, or (at your option) any later version.
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 *
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 * GEGL 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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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
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 *
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 * Copyright 2006 Philip Lafleur
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 */
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#include "config.h"
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#include <glib/gi18n-lib.h>
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#ifdef GEGL_CHANT_PROPERTIES
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gegl_chant_double (degrees, -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
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                   _("Angle to rotate (clockwise)"))
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#else
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#define GEGL_CHANT_NAME rotate
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#define GEGL_CHANT_DESCRIPTION  _("Rotate the buffer around the specified origin.")
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#define GEGL_CHANT_SELF "rotate.c"
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#include "chant.h"
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#include <math.h>
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static void
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create_matrix (OpTransform *op,
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               GeglMatrix3 *matrix)
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{
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  GeglChantOperation *chant = GEGL_CHANT_OPERATION (op);
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  gdouble radians = chant->degrees * (2 * G_PI / 360.0);
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  matrix->coeff [0][0] = matrix->coeff [1][1] = cos (radians);
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  matrix->coeff [0][1] = sin (radians);
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  matrix->coeff [1][0] = - matrix->coeff [0][1];
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}
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#endif