圆弧图元类代码，记录圆弧图元的属性及一些操作方式（如移动），在VB画圆弧时有重要作用-Arc-type element code, record the properties of circular elements and some operations (such as mobile), in VB when painting plays an important role in Arc

函数注册在Matlab和C++接口中起着重要的作用,在介绍函数注册作用-Function in Matlab and c++ interface plays an important role, introduces the function registered function