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/*************************************************************************
* Copyright (C) 2010-2014 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library 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. *
* *
* The Dimension 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Gradient pattern.
*/
#include "dimension.h"
/** Gradient pattern type. */
typedef struct dmnns_gradient {
dmnsn_pattern pattern;
dmnsn_vector orientation;
} dmnsn_gradient;
/** Gradient pattern callback. */
static double
dmnsn_gradient_pattern_fn(const dmnsn_pattern *pattern, dmnsn_vector v)
{
const dmnsn_gradient *gradient = (const dmnsn_gradient *)pattern;
double n = fmod(dmnsn_vector_dot(gradient->orientation, v), 1.0);
if (n < -dmnsn_epsilon) {
n += 1.0;
}
return n;
}
dmnsn_pattern *
dmnsn_new_gradient_pattern(dmnsn_pool *pool, dmnsn_vector orientation)
{
dmnsn_gradient *gradient = DMNSN_PALLOC(pool, dmnsn_gradient);
gradient->orientation = dmnsn_vector_normalized(orientation);
dmnsn_pattern *pattern = &gradient->pattern;
dmnsn_init_pattern(pattern);
pattern->pattern_fn = dmnsn_gradient_pattern_fn;
return pattern;
}
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