//圖形shape類   
//Shape.h

//包含的頭文件

//類定義
class Shape:public CObject{		//繼承于CObject類	
	DECLARE_SERIAL(Shape)   
protected:
	CString expression;		//圖形的表達式
public:
	Shape();
	~Shape();
	virtual void drawShape(CDC *pDC,Coordinate co);		//畫圖，虛函數
	virtual void Serialize(CArchive& ar);				//串行化，虛函數
public:
	CString getExpression();		//獲取圖形的表達式
};