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pack

lightweight rectangle packer

boxes

pack is a box packing algorithm which attempts to determine the most compact configuration for a set of rectangles. To this end, it employs the first-fit decreasing (FFD) algorithm to place the boxes, using the length of the layout's shortest side length as a heuristic.

Unlike traditional bin packing algorithms, the boxes here are placed in a single container that grows appropriately as they are packed inside. This property makes it ideal for assembling spritesheets given a list of images.

usage

`pack(sizes) -> layout`

Arranges a list of [ width, height ] pairs into the most compact layout possible. The result will be reminiscent of the following data structure:

var layout = {
  size: [ 13, 8 ],
  boxes: [
    { size: [ 5, 3 ], position: [ 0, 0 ] },
    { size: [ 6, 5 ], position: [ 0, 3 ] }
    { size: [ 5, 4 ], position: [ 6, 0 ] },
    { size: [ 2, 4 ], position: [ 11, 0 ] },
    { size: [ 7, 4 ], position: [ 6, 4 ] },
    { size: [ 1, 3 ], position: [ 5, 0 ] },
  ]
}