![jtsiomb](/assets/img/avatar_default.png)
git-svn-id: http://kdtree.googlecode.com/svn/trunk@32 58b2c0e6-ac2f-0410-a5b6-b51bcff41737
129 lines
5.3 KiB
C
129 lines
5.3 KiB
C
/*
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This file is part of ``kdtree'', a library for working with kd-trees.
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Copyright (C) 2007-2011 John Tsiombikas <nuclear@member.fsf.org>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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OF SUCH DAMAGE.
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*/
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#ifndef _KDTREE_H_
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#define _KDTREE_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct kdtree;
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struct kdres;
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/* create a kd-tree for "k"-dimensional data */
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struct kdtree *kd_create(int k);
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/* free the struct kdtree */
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void kd_free(struct kdtree *tree);
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/* remove all the elements from the tree */
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void kd_clear(struct kdtree *tree);
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/* if called with non-null 2nd argument, the function provided
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* will be called on data pointers (see kd_insert) when nodes
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* are to be removed from the tree.
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*/
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void kd_data_destructor(struct kdtree *tree, void (*destr)(void*));
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/* insert a node, specifying its position, and optional data */
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int kd_insert(struct kdtree *tree, const double *pos, void *data);
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int kd_insertf(struct kdtree *tree, const float *pos, void *data);
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int kd_insert3(struct kdtree *tree, double x, double y, double z, void *data);
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int kd_insert3f(struct kdtree *tree, float x, float y, float z, void *data);
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/* Find the nearest node from a given point.
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*
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* This function returns a pointer to a result set with at most one element.
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*/
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struct kdres *kd_nearest(struct kdtree *tree, const double *pos);
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struct kdres *kd_nearestf(struct kdtree *tree, const float *pos);
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struct kdres *kd_nearest3(struct kdtree *tree, double x, double y, double z);
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struct kdres *kd_nearest3f(struct kdtree *tree, float x, float y, float z);
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/* Find the N nearest nodes from a given point.
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*
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* This function returns a pointer to a result set, with at most N elements,
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* which can be manipulated with the kd_res_* functions.
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* The returned pointer can be null as an indication of an error. Otherwise
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* a valid result set is always returned which may contain 0 or more elements.
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* The result set must be deallocated with kd_res_free after use.
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*/
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/*
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struct kdres *kd_nearest_n(struct kdtree *tree, const double *pos, int num);
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struct kdres *kd_nearest_nf(struct kdtree *tree, const float *pos, int num);
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struct kdres *kd_nearest_n3(struct kdtree *tree, double x, double y, double z);
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struct kdres *kd_nearest_n3f(struct kdtree *tree, float x, float y, float z);
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*/
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/* Find any nearest nodes from a given point within a range.
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*
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* This function returns a pointer to a result set, which can be manipulated
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* by the kd_res_* functions.
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* The returned pointer can be null as an indication of an error. Otherwise
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* a valid result set is always returned which may contain 0 or more elements.
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* The result set must be deallocated with kd_res_free after use.
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*/
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struct kdres *kd_nearest_range(struct kdtree *tree, const double *pos, double range);
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struct kdres *kd_nearest_rangef(struct kdtree *tree, const float *pos, float range);
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struct kdres *kd_nearest_range3(struct kdtree *tree, double x, double y, double z, double range);
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struct kdres *kd_nearest_range3f(struct kdtree *tree, float x, float y, float z, float range);
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/* frees a result set returned by kd_nearest_range() */
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void kd_res_free(struct kdres *set);
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/* returns the size of the result set (in elements) */
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int kd_res_size(struct kdres *set);
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/* rewinds the result set iterator */
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void kd_res_rewind(struct kdres *set);
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/* returns non-zero if the set iterator reached the end after the last element */
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int kd_res_end(struct kdres *set);
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/* advances the result set iterator, returns non-zero on success, zero if
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* there are no more elements in the result set.
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*/
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int kd_res_next(struct kdres *set);
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/* returns the data pointer (can be null) of the current result set item
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* and optionally sets its position to the pointers(s) if not null.
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*/
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void *kd_res_item(struct kdres *set, double *pos);
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void *kd_res_itemf(struct kdres *set, float *pos);
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void *kd_res_item3(struct kdres *set, double *x, double *y, double *z);
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void *kd_res_item3f(struct kdres *set, float *x, float *y, float *z);
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/* equivalent to kd_res_item(set, 0) */
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void *kd_res_item_data(struct kdres *set);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _KDTREE_H_ */
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