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commonutils's Introduction

主要用于记录开发过程中的一些积累,封装一些常用工具

WDSignatureCanvas(iOS涂鸦封装)

大多数涂鸦都是用一次或二次贝塞尔曲线实现的,并通过drawRect或者shapeLayer绘制,无法实现笔锋效果,而OpenGL ES有太复杂,所以自己参考了很多代码库,用二次贝塞尔曲线算法取点,根据速度计算点的大小,最终通过画椭圆的方式,实现笔锋, 效果图下:

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