draw bezier
贝塞尔曲线由起始点，终止点(也称猫店)和控制点组成，通过调整控制点，通过一定方式绘制的贝塞尔曲线形状会发生变化
贝塞尔曲线在计算机图形学中运用广泛，例如 Photoshop 中的钢笔效果，我们熟知的 CSS 动画过渡时间函数也是用过贝塞尔曲线(三阶)获取的
这篇文章很好的介绍了贝塞尔曲线：掘金：深入理解贝塞尔曲线
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