考虑一个简单的画图应用程序，可以画圆或者方的形状。
Consider a simple drawing application that can draw shapes such as rectangles and circles.
详细说明：用C+ +语言实现的绘图程序，主要功能包括：画线、画圆、画矩形以及序列化等功能。- Using等功能。
C + + language to achieve the drawing program, the main functions include: drawing lines, drawing circles, drawing rectangle, as well as serialization and other functions.
详细说明：用C+ +语言实现的绘图程序，主要功能包括：画线、画圆、画矩形以及序列化等功能。- Using等功能。
C + + language to achieve the drawing program, the main functions include: drawing lines, drawing circles, drawing rectangle, as well as serialization and other functions.
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