有道云笔记的原笔迹手写功能的app应用源码，有四种默认的笔直径，和四种默认的笔类型，以及30种色彩，可以随意涂鸦撤销清除并且可以保存图片到设备中-Ethics cloud notes the original handwriting handwriting function app application source code, there are four kinds of default pen diameter, and four kinds of default pen type, a