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The potpack npm package is a utility for packing rectangles into a single bin. It is useful for tasks such as packing images into a texture atlas or arranging elements in a confined space efficiently.
Rectangle Packing
This feature allows you to pack a list of rectangles into a single bin. The function returns the width and height of the bin and the fill rate. The input rectangles are modified to include their x and y positions in the bin.
const potpack = require('potpack');
const rectangles = [
{ w: 100, h: 200 },
{ w: 300, h: 100 },
{ w: 50, h: 50 }
];
const { w, h, fill } = potpack(rectangles);
console.log(`Packed width: ${w}, height: ${h}, fill: ${fill}`);
console.log('Rectangles:', rectangles);
The bin-pack package provides similar functionality for packing rectangles into a bin. It offers a more flexible API with support for different packing algorithms. Compared to potpack, bin-pack may offer more options but could be more complex to use.
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.
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 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
— only import
in ESM-capable versions (v12.15+):
import potpack from 'potpack';
FAQs
A tiny library for packing 2D rectangles (for sprite layouts)
We found that potpack demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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