canvas庫-fabric.js

參考

https://github.com/fabricjs/fabric.js

https://blackstarxing.github.io/2019-08-17-fabric-doc.html

https://github.com/vipstone/drawingboard?spm=a2c4e.10696291.0.0.41f519a4HHv3wy

https://my.oschina.net/xmqywx/blog/1941539

https://github.com/fabricjs/fabric.js/blob/master/lib/aligning_guidelines.js

https://juejin.im/post/5c5432ca6fb9a049b82ae58a

https://juejin.im/post/5c6612a9518825629b42dd70

https://www.cnblogs.com/lfqcode/p/8601605.html

https://blog.csdn.net/mnhn456/article/details/78758614

https://www.youtube.com/watch?v=fKoZaBiVOgY&list=PLbu98QxRH81LNY0PYN7s-71u8aYi6ozXs&index=20&t=13s

https://www.jianshu.com/p/939974a482fe