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potpack's Introduction

potpack

A tiny JavaScript library for packing 2D rectangles into a near-square container, which is useful for generating CSS sprites and WebGL textures. Similar to shelf-pack, but static (you can't add items once a layout is generated), and aims for maximal space utilization.

A variation of algorithms used in rectpack2D and bin-pack, which are in turn based on this article by Blackpawn.

Example usage

import potpack from 'potpack';

const boxes = [
    {w: 300, h: 50},
    {w: 100, h: 200},
    ...
];

const {w, h, fill} = potpack(boxes);
// w and h are resulting container's width and height;
// fill is the space utilization value (0 to 1), higher is better

// potpack mutates the boxes array: it's sorted by height,
// and box objects are augmented with x, y coordinates:
boxes[0]; // {w: 300, h: 50,  x: 100, y: 0}
boxes[1]; // {w: 100, h: 200, x: 0,   y: 0}

Install

Install with NPM: npm install potpack.

Potpack is provided as a ES module, so it's only supported on modern browsers, excluding IE:

<script type="module">
import potpack from 'https://cdn.skypack.dev/potpack';
...
</script>

In Node, you can't use require โ€” only import in ESM-capable versions (v12.15+):

import potpack from 'potpack';

potpack's People

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potpack's Issues

Drop Images Folder

This looks beautiful. It could be even more usable if a folder could be specified where images were stored and then potpack derived the dimensions from the images found there.

Sort Messes up Id

I am passing an object into - potpack(array)
array has a unique id,
I try to references is later
var id = this.nodes[i].group.id
var groupX = gridValues[id].x;

But it seems everything has been reorganized.
I thought the array its self and all its child keys would be mutated in a sort, is this correct?

Example does not work properly

Original Example

import potpack from 'potpack';

const boxes = [
    {w: 300, h: 50},
    {w: 100, h: 200},
    ...
];

const {w, h, fill} = potpack(boxes);
// w and h are resulting container's width and height;
// fill is the space utilization value (0 to 1), higher is better

// potpack mutates the boxes array: it's sorted by height,
// and box objects are augmented with x, y coordinates:
boxes[0]; // {w: 300, h: 50,  x: 100, y: 0}
boxes[1]; // {w: 100, h: 200, x: 0,   y: 0}

Example usage is as above but real world tests are further below.

Test from Github Source Code

import potpack from 'potpack';

const boxes = [
    {w: 300, h: 50},
    {w: 100, h: 200},
    ...
];

const {w, h, fill} = potpack(boxes);
// w and h are resulting container's width and height;
// fill is the space utilization value (0 to 1), higher is better

// potpack mutates the boxes array: it's sorted by height,
// and box objects are augmented with x, y coordinates:
boxes[0]; // {w: 100, h: 200, x: 0, y: 0}
boxes[1]; // {w: 300, h: 50, x: 0, y: 200}

The important difference in the 2th example is that the order changes so it is not possible to distinguish without an id system.

Why is there such a difference, is the code in the git repo broken?

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