π Quadtree (Go)
A quadtree implementation in Go, featuring insertion and retrieval of bounding boxes and points.
What is it?
"A quadtree is a tree data structure in which each internal node has exactly four children. Quadtrees are most often used to partition a two-dimensional space by recursively subdividing it into four quadrants or regions. The regions may be square or rectangular, or may have arbitrary shapes. This data structure was named a quadtree by Raphael Finkel and J.L. Bentley in 1974." - Wikipedia (2016)
Setup
Usage
qt := &quadtree.Quadtree{
Bounds: quadtree.Bounds{
X: 0,
Y: 0,
Width: 100,
Height: 100,
},
MaxObjects: 10,
MaxLevels: 4,
Level: 0,
Objects: make([]quadtree.Bounds, 0),
Nodes: make([]quadtree.Quadtree, 0),
}
// Insert some boxes
qt.Insert(Bounds{
X: 1,
Y: 1,
Width: 10,
Height: 10,
})
qt.Insert(Bounds{
X: 5,
Y: 5,
Width: 10,
Height: 10,
})
qt.Insert(Bounds{
X: 10,
Y: 10,
Width: 10,
Height: 10,
})
qt.Insert(Bounds{
X: 15,
Y: 15,
Width: 10,
Height: 10,
})
//Get all the intersections
intersections := qt.RetrieveIntersections(Bounds{
X: 5,
Y: 5,
Width: 2.5,
Height: 2.5,
})
// Clear the Quadtree
qt.Clear()
Acknowledgements
This package is based on Timo Hausmann JavaScript Quadtree implementation. This is in turn based on this post.
License
MIT
Original JavaScript code: Copyright Β© 2012 Timo Hausmann
Go code: Copyright Β© 2016 James Milner