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/*************************************************************************
* Copyright (C) 2010 Tavian Barnes <tavianator@gmail.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/>. *
*************************************************************************/
/*
* Priority R-Trees for storing bounding box hierarchies. PR-trees are a data
* structure introduced by Arge, de Berg, Haverkort, and Yi, which provides
* asymptotically optimal worst-case lookup, while remaining efficient with
* real-world data. Their structure is derived from B-trees.
*/
#ifndef DIMENSION_IMPL_PRTREE_H
#define DIMENSION_IMPL_PRTREE_H
#include <stdbool.h>
/* Number of children per node */
#define DMNSN_PRTREE_B 6
typedef struct dmnsn_prtree_node {
/* Children (objects or subtrees) */
void *children[DMNSN_PRTREE_B];
bool is_leaf;
/* Bounding box */
dmnsn_bounding_box bounding_box;
} dmnsn_prtree_node;
typedef struct dmnsn_prtree {
dmnsn_prtree_node *root;
dmnsn_array *unbounded;
} dmnsn_prtree;
dmnsn_prtree *dmnsn_new_prtree(const dmnsn_array *objects);
void dmnsn_delete_prtree(dmnsn_prtree *tree);
bool dmnsn_prtree_search(const dmnsn_prtree *tree, dmnsn_line ray,
dmnsn_intersection *intersection);
#endif /* DIMENSION_IMPL_PRTREE_H */
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