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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 {
+ /* Children (objects or subtrees) */
+ void *children[DMNSN_PRTREE_B];
+ bool is_leaf;
+
+ /* Bounding box */
+ dmnsn_bounding_box bounding_box;
+} 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 */