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authorTavian Barnes <tavianator@tavianator.com>2020-04-19 16:28:10 -0400
committerTavian Barnes <tavianator@tavianator.com>2020-05-01 09:52:56 -0400
commitc653c8cda8f49d3bbe07190a6477367290ff7f04 (patch)
treecbba1dbb655b851739bcc38b7839758e845dae64 /kd-forest.h
parentd95e93bf70f3351e6fd489284794ef7909fd94ce (diff)
downloadkd-forest-c653c8cda8f49d3bbe07190a6477367290ff7f04.tar.xz
Begin re-writing in Rust
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-rw-r--r--kd-forest.h56
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-/*********************************************************************
- * kd-forest *
- * Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com> *
- * *
- * This program is free software. It comes without any warranty, to *
- * the extent permitted by applicable law. You can redistribute it *
- * and/or modify it under the terms of the Do What The Fuck You Want *
- * To Public License, Version 2, as published by Sam Hocevar. See *
- * the COPYING file or http://www.wtfpl.net/ for more details. *
- *********************************************************************/
-
-#ifndef KD_FOREST_H
-#define KD_FOREST_H
-
-#include <stdbool.h>
-#include <stddef.h>
-#include <stdint.h>
-
-#define KD_DIMEN 3
-
-// Single node in a k-d tree
-typedef struct kd_node_t {
- // Node coordinates
- double coords[KD_DIMEN];
- // Sub-trees
- struct kd_node_t *left, *right;
- // Used to keep track of which sub-tree a node is in during construction
- bool is_left;
- // Weak delete support
- bool removed;
-
- // Corresponding image position for this node
- unsigned int x, y;
-} kd_node_t;
-
-kd_node_t *new_kd_node(double coords[KD_DIMEN], unsigned int x, unsigned int y);
-
-// A forest of k-d trees
-typedef struct {
- // Array of k-d tree roots
- kd_node_t **roots;
- // Size and capacity of the roots array
- unsigned int roots_size, roots_capacity;
- // The actual size of this tree
- size_t size;
- // The size estimate for this tree, counting removed nodes
- size_t size_est;
-} kd_forest_t;
-
-void kdf_init(kd_forest_t *kdf);
-void kdf_destroy(kd_forest_t *kdf);
-void kdf_insert(kd_forest_t *kdf, kd_node_t *node);
-void kdf_remove(kd_forest_t *kdf, kd_node_t *node);
-kd_node_t *kdf_find_nearest(const kd_forest_t *kdf, const double target[KD_DIMEN]);
-
-#endif // KD_FOREST_H