Imports of package quadtree

PathSynopsis
container/heapPackage heap provides heap operations for any type that implements heap.Interface.
errorsPackage errors implements functions to manipulate errors.
github.com/paulmach/orb
github.com/paulmach/orb/planarPackage planar computes properties on geometries assuming they are in 2d euclidean space.
mathPackage math provides basic constants and mathematical functions.