Algorithm Reference http://pds25.egloos.com/pds/201504/21/98/RectangleBinPack.pdf https://github.com/juj/RectangleBinPack https://github.com/PistonDevelopers/texture_packer https://github.com/amethyst/sheep https://github.com/nical/etagere https://github.com/nical/guillotiere https://github.com/mapbox/shelf-pack/