r_tree 2.1.6

R-tree implementation to index and query two-dimensional data

RTree

A recursive RTree library written in Dart. This R-tree implementation is used to index and query two-dimensional data. Items are inserted and balanced via the RTree class and can then be queried by Rectangle. The balancing can be tweaked by modifying the branch factor of the RTree.

"R-trees are tree data structures used for spatial access methods, i.e., for indexing multi-dimensional information such as geographical coordinates, rectangles or polygons." - http://en.wikipedia.org/wiki/R-tree

Example

Run the example app for a visual demonstration of the RTree

webdev serve example:8080

Navigate to http://localhost:8080. A canvas is drawn, click & drag on the canvas to add rectangles of various colors to your RTree, then click the search button and click & drag over an area of the canvas to search it for rectangles.

Benchmarks

Run the benchmarks in the command line (Dart VM) using:

dart benchmark/benchmarks.dart

You can also run them in a browser using dart2js. This takes an extra step since webdev will only build the web directory as of this writing. You'll also need some binary for serving a directory on a web server, the example below uses serve.

cp -R benchmark/ web
webdev build
serve build

Click the run button and observe the output in the browser console.