79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/*
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quadtree.h
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2014 JSK (kutani@projectkutani.com)
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Part of the Panic Panic project.
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Released to the public domain. See LICENSE for details.
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*/
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#ifndef _QUADTREE_H
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#define _QUADTREE_H
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#ifndef _AABB_H
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#include "aabb.h"
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#endif
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/// Opaque pointer to a quadtree data structure
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typedef struct _qtree* qtree;
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/// A function pointer def for determining if an element exists in a range
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typedef int (*qtree_fnc)(void *ptr, aabb *range);
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typedef int (*qtree_rm)(void *ptr, void *cmp);
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/// Create a new qtree
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/*!
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Creates a new qtree with a bound of w,h size, centered at x,y.
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Uses the passed function pointer fnc to test elements against nodes
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for insertion, and finding.
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Returns a new qtree pointer.
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*/
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qtree qtree_new(float x, float y, float w, float h, qtree_fnc fnc, qtree_rm rm);
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void qtree_destroy(qtree q);
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/// Insert an element
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/*!
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Inserts the passed element into quadtree q.
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Uses the function passed to qtree_new() to determine where the
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element should go.
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*/
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void qtree_insert(qtree q, void *ptr);
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/// Removes an element from the quadtree
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/*!
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Performs a selective removal of the passed element.
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Performs a naive pointer comparison and a depth-first search of the
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tree, so this isn't very fast.
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*/
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void qtree_remove(qtree q, void *ptr);
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/// Set the maximum number of elements per node
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/*!
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Sets the maximum elements per quadtree node.
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The default is 4.
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*/
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void qtree_setMaxNodeCnt(qtree q, uint16_t cnt);
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/// Resets a quadtree
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/*!
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Clears all nodes held by the quadtree and creates a fresh root node
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with no elements assigned.
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*/
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void qtree_clear(qtree q);
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/// Find all elements within a rectangular bound
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/*!
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Performs a search for any elements within the given x,y + w,h
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bound. Returns an array of pointers to any elements (which should be
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freed by the user), and places the number of elements in cnt.
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*/
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void** qtree_findInArea(qtree q, float x, float y, float w, float h, uint32_t *cnt);
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#endif
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