三次Bezier曲线虽然原理跟二次Bezier曲线的类似，但是具体编程时还是有很多地方需要注意，因实际应用中三次Bezier曲线的作用越来越大，-Although the principle of three Bezier curves with the quadratic Bezier curve is similar, but the specific programming when there are still many places need attention, because o