Shape Shifter

SVG icon animation tool for Android, iOS, and the web
Under Apache License 2.0
By alexjlockwood

typescript android ios angular svg icon-animations animated-vector-drawable

Shape Shifter

Go to live version or ask a question on Slack

Shape Shifter is a web-app that simplifies
the creation of icon animations for Android, iOS, and the web.

This tool currently exports to standalone SVGs, SVG spritesheets,
and CSS keyframe animations for the web, as well as to
format for Android. I am totally open to adding support for other export formats as well, so
if you have a format that you'd like to see added in the future,
file a feature request!

Try out the beta version, which adds the ability to draw/edit paths directly on the canvas (written using the amazing paper.js library)!


Support us with either a one time donation or a monthly donation and help us
continue our activities. Funds will go towards hiring new developers to work
on awesome features! We'll display your logo below with a link to your site.

? Become a backer ?


Is your company using Shape Shifter? Ask your manager to support us!
We'll display your logo below with a link to your site.

? Become a sponsor ?


I gave a couple of live demos that illustrate how to use the tool at Droidcon SF (15:15 - 20:33):

Here are some example icon animations created by Shape Shifter:


Writing high-quality path morphing animations
is a tedious and time-consuming task. In order to morph one shape into another,
the SVG paths describing the two must be compatible with each other—that is,
they need to have the same number and type of drawing commands. This is problematic because:


To address these problems, Shape Shifter provides the following features:

How does it work?

Pretty much all of the graphics in this app are powered by bezier curve approximations under-the-hood.
I learned most of what I needed to know from this excellent primer on bezier curves
(especially sections 9 and 33, which explain how to split and project points onto bezier
curves without altering their original appearance). Most of the interesting SVG-related code
is located under src/app/model/paths.

Auto fix is powered by an adaptation of the Needleman-Wunsch algorithm,
which is used in bioinformatics to align protein or nucleotide sequences. Instead of
aligning DNA base-pairs, Shape Shifter aligns the individual SVG commands that make up
each path instead. You can view the current implementation of the algorithm in the
AutoAwesome.ts file.

Bug reports & feature requests

Let me know if you encounter any issues with the app (attach SVG files and/or
screenshots if you can). Before you do, take a look at the list of known issues
here and leave a comment
on the existing bugs you want to see fixed in a future release!

I am open to pretty much any feature request, so don't be afraid to ask!
I'll likely work on the most popular feature requests first. I'm especially
curious how I can make this web app more useful for iOS and web developers.

Build instructions

If you want to contribute, you can build and serve the web app locally as follows:

  1. First install Node.js and npm.

  2. Clone the repository and in the root directory, run:

    npm install

  3. To build and serve the web app locally, run:

    npm start

Special thanks

Huge thanks to Nick Butcher, Roman Nurik,
and Steph Yim for all of their help during the early stages of this project!