dungeon_crawler
view prototype/kdtree/kdtree.h @ 59:b6bf86d4f1cf
forgot the new tiles
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Fri, 21 Sep 2012 05:28:45 +0300 |
| parents | |
| children |
line source
1 /*
2 This file is part of ``kdtree'', a library for working with kd-trees.
3 Copyright (C) 2007-2011 John Tsiombikas <nuclear@member.fsf.org>
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are met:
8 1. Redistributions of source code must retain the above copyright notice, this
9 list of conditions and the following disclaimer.
10 2. Redistributions in binary form must reproduce the above copyright notice,
11 this list of conditions and the following disclaimer in the documentation
12 and/or other materials provided with the distribution.
13 3. The name of the author may not be used to endorse or promote products
14 derived from this software without specific prior written permission.
16 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
21 OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
24 IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
25 OF SUCH DAMAGE.
26 */
27 #ifndef _KDTREE_H_
28 #define _KDTREE_H_
30 #ifdef __cplusplus
31 extern "C" {
32 #endif
34 struct kdtree;
35 struct kdres;
38 /* create a kd-tree for "k"-dimensional data */
39 struct kdtree *kd_create(int k);
41 /* free the struct kdtree */
42 void kd_free(struct kdtree *tree);
44 /* remove all the elements from the tree */
45 void kd_clear(struct kdtree *tree);
47 /* if called with non-null 2nd argument, the function provided
48 * will be called on data pointers (see kd_insert) when nodes
49 * are to be removed from the tree.
50 */
51 void kd_data_destructor(struct kdtree *tree, void (*destr)(void*));
53 /* insert a node, specifying its position, and optional data */
54 int kd_insert(struct kdtree *tree, const double *pos, void *data);
55 int kd_insertf(struct kdtree *tree, const float *pos, void *data);
56 int kd_insert3(struct kdtree *tree, double x, double y, double z, void *data);
57 int kd_insert3f(struct kdtree *tree, float x, float y, float z, void *data);
59 /* Find the nearest node from a given point.
60 *
61 * This function returns a pointer to a result set with at most one element.
62 */
63 struct kdres *kd_nearest(struct kdtree *tree, const double *pos);
64 struct kdres *kd_nearestf(struct kdtree *tree, const float *pos);
65 struct kdres *kd_nearest3(struct kdtree *tree, double x, double y, double z);
66 struct kdres *kd_nearest3f(struct kdtree *tree, float x, float y, float z);
68 /* Find the N nearest nodes from a given point.
69 *
70 * This function returns a pointer to a result set, with at most N elements,
71 * which can be manipulated with the kd_res_* functions.
72 * The returned pointer can be null as an indication of an error. Otherwise
73 * a valid result set is always returned which may contain 0 or more elements.
74 * The result set must be deallocated with kd_res_free after use.
75 */
76 /*
77 struct kdres *kd_nearest_n(struct kdtree *tree, const double *pos, int num);
78 struct kdres *kd_nearest_nf(struct kdtree *tree, const float *pos, int num);
79 struct kdres *kd_nearest_n3(struct kdtree *tree, double x, double y, double z);
80 struct kdres *kd_nearest_n3f(struct kdtree *tree, float x, float y, float z);
81 */
83 /* Find any nearest nodes from a given point within a range.
84 *
85 * This function returns a pointer to a result set, which can be manipulated
86 * by the kd_res_* functions.
87 * The returned pointer can be null as an indication of an error. Otherwise
88 * a valid result set is always returned which may contain 0 or more elements.
89 * The result set must be deallocated with kd_res_free after use.
90 */
91 struct kdres *kd_nearest_range(struct kdtree *tree, const double *pos, double range);
92 struct kdres *kd_nearest_rangef(struct kdtree *tree, const float *pos, float range);
93 struct kdres *kd_nearest_range3(struct kdtree *tree, double x, double y, double z, double range);
94 struct kdres *kd_nearest_range3f(struct kdtree *tree, float x, float y, float z, float range);
96 /* frees a result set returned by kd_nearest_range() */
97 void kd_res_free(struct kdres *set);
99 /* returns the size of the result set (in elements) */
100 int kd_res_size(struct kdres *set);
102 /* rewinds the result set iterator */
103 void kd_res_rewind(struct kdres *set);
105 /* returns non-zero if the set iterator reached the end after the last element */
106 int kd_res_end(struct kdres *set);
108 /* advances the result set iterator, returns non-zero on success, zero if
109 * there are no more elements in the result set.
110 */
111 int kd_res_next(struct kdres *set);
113 /* returns the data pointer (can be null) of the current result set item
114 * and optionally sets its position to the pointers(s) if not null.
115 */
116 void *kd_res_item(struct kdres *set, double *pos);
117 void *kd_res_itemf(struct kdres *set, float *pos);
118 void *kd_res_item3(struct kdres *set, double *x, double *y, double *z);
119 void *kd_res_item3f(struct kdres *set, float *x, float *y, float *z);
121 /* equivalent to kd_res_item(set, 0) */
122 void *kd_res_item_data(struct kdres *set);
125 #ifdef __cplusplus
126 }
127 #endif
129 #endif /* _KDTREE_H_ */