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/*************************************************************************
* Copyright (C) 2009-2010 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
* Patterns.
*/
#include "dimension.h"
/* Allocate a dummy pattern */
dmnsn_pattern *
dmnsn_new_pattern(void)
{
dmnsn_pattern *pattern = dmnsn_malloc(sizeof(dmnsn_pattern));
pattern->trans = dmnsn_identity_matrix();
pattern->free_fn = NULL;
return pattern;
}
/* Delete a pattern */
void
dmnsn_delete_pattern(dmnsn_pattern *pattern)
{
if (pattern->free_fn) {
(*pattern->free_fn)(pattern->ptr);
}
dmnsn_free(pattern);
}
/* Precompute the transformation matrix inverse */
void
dmnsn_initialize_pattern(dmnsn_pattern *pattern)
{
pattern->trans_inv = dmnsn_matrix_inverse(pattern->trans);
}
/* Invoke the pattern callback with the right transformation */
double
dmnsn_pattern_value(const dmnsn_pattern *pattern, dmnsn_vector v)
{
v = dmnsn_transform_vector(pattern->trans_inv, v);
return (*pattern->pattern_fn)(pattern, v);
}
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