Spritesheet Assembler

• Support for SVG/PNG/JPG sprites
• Generate CSS/JSON descriptors
• Simple: tiny source, minimal dependencies. Please fork/contribute!

Install

This package relies on GraphicsMagick, so:

• OS X: brew install graphicsmagick
• Linux: sudo apt-get install graphicsmagick

Install:

npm install -g spritesheet-assembler

And run:

spass -i icons/ -o images/spritesheet.png -d styles/icons.css

Demos

1. CSS SpriteSheet demo
2. Spritesheet packing algorithm demo
3. Check out utility results in tests

Algorithm

• Demo
• Source

Spritesheet packing algorithm is based on the one described in Jake's great article. This implementation, however, doesn't use binary tree, maintaining instead a list of free spaces.

Code Overview

The code is split into three parts:

• lib/ - all the logic of bin-packing is here. Lib provides core abstractions of Sprite and SpriteSheet, as well as the bin-packing algorithm itself. This folder doesn't and shouldn't depend on any core node modules.
• compositors/ - this folder contains compositors, which are responsible for building actual spritesheet out of sprites. Compositors are associated with export mime types, the relation is defined in compositors/index.js.
• descriptors/ - this folder contains spritesheet descriptor generators. Descriptor generators are associated with descriptor mime type, the relation is defined in descriptors/index.js.

Tests

Each test runs spritesheet-assembler with given arguments and compares generated files with expected results.

To run all tests:

npm test

To run only tests with 'svg' in name:

npm test -- svg

To reset test results for all svg tests: (or generate results for a newly added test):

npm test -- svg reset-results

To add a test:

1. create a new folder under tests/ folder which starts with two-digit number, e.g. tests/01-some-new-test/.
2. add arguments.js file which should define input arguments for the utility: example

History

This started as a patch to Chrome DevTools project: https://codereview.chromium.org/2671413004/

License

See LICENSE here.

Contacts

Feel free to drop me a line at aslushnikov@gmail.com or via twitter