Crate static_aabb2d_index

This crate implements a static/fixed size indexing data structure for two dimensional axis aligned bounding boxes. The index allows for fast construction and fast querying but cannot be modified after creation.

2D axis aligned bounding boxes are represented by two extent points (four values): (min_x, min_y), (max_x, max_y).

This is a port of the flatbush javascript library.

Examples

use static_aabb2d_index::*;
// create builder for index containing 4 axis aligned bounding boxes
// index also supports integers and custom types that implement the IndexableNum trait
let mut builder: StaticAABB2DIndexBuilder<f64> = StaticAABB2DIndexBuilder::new(4);
// add bounding boxes to the index
// add takes in (min_x, min_y, max_x, max_y) of the bounding box
builder.add(0.0, 0.0, 2.0, 2.0);
builder.add(-1.0, -1.0, 3.0, 3.0);
builder.add(0.0, 0.0, 1.0, 3.0);
builder.add(4.0, 2.0, 16.0, 8.0);
// note build() may return an error if the number of added boxes does not equal the static size
// given at the time the builder was created or the type used fails to cast to/from a u16
let index: StaticAABB2DIndex<f64> = builder.build().unwrap();
// query the created index (min_x, min_y, max_x, max_y)
let query_results = index.query(-1.0, -1.0, -0.5, -0.5);
// query_results holds the index positions of the boxes that overlap with the box given
// (positions are according to the order boxes were added the index builder)
assert_eq!(query_results, vec![1]);
// the query may also be done with a visiting function that can stop the query early
let mut visited_results: Vec<usize> = Vec::new();
let mut visitor = |box_added_pos: usize| -> bool {
    visited_results.push(box_added_pos);
    // return true to continue visiting results, false to stop early
    true
};

index.visit_query(-1.0, -1.0, -0.5, -0.5, &mut visitor);
assert_eq!(visited_results, vec![1]);

Structs

AABB	Simple 2D axis aligned bounding box which holds the extents of a 2D box.
NeighborsState	Holds state for priority queue used in nearest neighbors query.
StaticAABB2DIndex	Static/fixed size indexing data structure for two dimensional axis aligned bounding boxes.
StaticAABB2DIndexBuilder	Used to build a StaticAABB2DIndex.

Enums

StaticAABB2DIndexBuildError

Error type for errors that may be returned in attempting to build the index.

Traits

IndexableNum

Trait used by the StaticAABB2DIndex that is required to be implemented for type T. It is blanket implemented for all supported primitive numeric types.

Functions

hilbert_xy_to_index

Maps 2d space to 1d hilbert curve space.

Type Definitions

NeighborPriorityQueue

Type alias for priority queue used for nearest neighbor searches.