[roychen]

http://paperjs.org/
https://scriptographer.org/

Paper.js is an open source vector graphics scripting framework that runs on top of the HTML5 Canvas. It offers a clean Scene Graph / Document Object Model and a lot of powerful functionality to create and work with vector graphics and bezier curves, all neatly wrapped up in a well designed, consistent and clean programming interface.
Paper.js is based on and largely compatible withScriptographer, a scripting environment for Adobe Illustrator with an active community of scripters and more than 10 years of development.

http://paperjs.org/examples/tadpoles/ 点右上角的source可以看到代码
有兴趣的看看

[aheron]

非常有意思的脚本站，特别是那些个演示

[断翅蝴蝶]

楼主给的几个网站 都看过了

[Helix.xu]

第一个网址上面有个动态演示图片挺好玩的，手机看的 在上面滑动手指会有跟随变化效果，尖角圆角。