本次程序设计为基于C++的面向对象的程序设计。用C++各种基本图形（例如，圆、矩形、三角形、直线、点等）的类原型，通过继承图形这一个公共基类来实现图形的增删改以及保存等操作。-The programming C++ based object-oriented programming. With C++ basic graphics (such as circles, rectangles, triangles, lines, points, etc.) of the class prototyp