(1)鼠标在进行操作的时候,要用到各种命令,而各种命令和实体图形的交互,实际就是鼠标的移动,按下,抬起等
对于不同的命令,如画线,平移等都与鼠标的动作相关,因此有必要抽像出一个基类,而各种命令具体实现鼠标
的各种操作,具体如下
class CComand
{
public:
CComand(){};
virtual ~CComand(){};
public:
virtual void OnLButtonDown(UINT nFlags, CPosition pos){};
virtual void OnMouseMove(UINT nFlags, CPosition pos){};
virtual void OnRButtonDown(UINT nFlags, CPosition pos){};
virtual void OnLButtonUp(UINT nFlags, CPosition pos){};
virtual void OnMouseWheel(UINT nFlags, short zDelta, CPosition pos){};
virtual void OnMButtonDown(UINT nFlags, CPosition pos){};
virtual void OnMButtonUp(UINT nFlags, CPosition pos){};
private:
int m_nStep;
};
而m_nStep则是用来记录鼠标抬起及按下的次数
(2)在画直线,圆等实体的时候,都具有平移,旋转,镜像等功能,所以需要抽像出一个实体类,为了具有串行化功能,因此可以
从CObject派生
class CSolid : public CObject
{
public:
CSolid(){};
virtual ~CSolid(){};
protected:
int m_Width;
UINT m_Style;
COLORREF m_color;
public:
virtual void GetColor(COLORREF &clr){clr = m_color;};
virtual void SetColor(COLORREF clr){m_color = clr;};
virtual void DrawSolid(CDC *pDC, int drawMode) = 0;
virtual BOOL PickSolid(CPosition &pos, float dis) = 0;
virtual CSolid* Rotate(const CPosition &base, float angle) = 0;
virtual CSolid* Explan(CPosition pos, short zDelta) = 0;
virtual CSolid* Move(CPosition first, CPosition second) = 0;
virtual void DrawRect(BOOL br, CPosition &pos, CPosition *bpos = NULL){};
virtual CSolid *Mirror(CPosition &first, CPosition &second) = 0;
virtual CSolid *CopySolid() = 0;
};
int m_Width;
UINT m_Style;
COLORREF m_color;
以上三个变量可以初始化线宽,风格及艳色