Various spatial tree implementations.
The spatial-tree library is intended to contain a collection of spatial tree implementations. A spatial tree is a data structure for organizing and searching points in an n-dimensional space. The present implementation code implements a single spatial tree structure, the k-d tree.
This library currently only supported points in 3D space.[procedure] make-point3d:: DOUBLE * DOUBLE * DOUBLE -> POINT3D
3D point constructor.[procedure] point3d? :: POINT3D -> BOOL
3D point predicate.[procedure] point3d-x :: POINT3D -> DOUBLE
[procedure] point3d-y :: POINT3D -> DOUBLE
[procedure] point3d-z :: POINT3D -> DOUBLE
Accessors for the x,y,z coordinates of a 3D point.
A K-D tree (short for k-dimensional tree) is a space-partitioning data structure for organizing points in a k-dimensional space.
[procedure] list->kd-tree:: POINT3D LIST -> KD-TREE
Given a list of points, constructs and returns a K-D tree object.
Predicates[procedure] kd-tree? :: KD-TREE -> BOOL
Returns #t if the given object is a K-D tree, #f otherwise.[procedure] kd-tree-empty? :: KD-TREE -> BOOL
Returns #t if the given K-D tree object is empty, #f otherwise.[procedure] kd-tree-is-valid? :: KD-TREE -> BOOL
Checks whether the K-D tree property holds for the given tree. Specifically, it tests that all points in the left subtree lie to the left of the plane, p is on the plane, and all points in the right subtree lie to the right.[procedure] kd-tree-all-subtrees-are-valid? :: KD-TREE -> BOOL
Checks whether the K-D tree property holds for the given tree and all subtrees.
Accessors[procedure] kd-tree->list :: KD-TREE -> POINT3D LIST
Returns a list with the points contained in the tree.[procedure] kd-tree->list* :: KD-TREE -> (INT . POINT3D) LIST
Returns a list where every element has the form (i . p), where i is the relative index of this point, and p is the point.[procedure] kd-tree-subtrees :: KD-TREE -> KD-TREE LIST
[procedure] kd-tree-point :: KD-TREE -> POINT3D
Query procedures[procedure] kd-tree-nearest-neighbor
About this egg
- Improvements to internal representation
- Initial release
Copyright 2012 Ivan Raikov and the Okinawa Institute of Science and Technology. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program 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 General Public License for more details. A full copy of the GPL license can be found at <http://www.gnu.org/licenses/>.