command.h

一个用VC++编写的绘图工具

#ifndef _Command_h_
#define _Command_h_

#include "POSITION.H"

enum ECommandType	// 命令类
{
	ctUnknown = 0,

//  创建对象命令类
	ctCreateLine		= 1,	// 创建对象
	ctCreateRectangle	= 2,	// 创建矩形
	ctCreateCircle		= 3,	// 创建圆
	ctCreateArc			= 4,	// 创建圆弧
	// ...其他创建类型

//  修改命令类
	ctMove = 11,		// 移动
	ctRotate = 12,		// 旋转
	ctMirror = 13		// 镜像
	// ...其他创建类型
};

class CCommand
{
protected:
	int		m_nStep ; // 命令操作步

public:
	CCommand() {}
	~CCommand() {}

	virtual int GetType() = 0;	// 返回命令类型 ECommandType
	virtual int OnLButtonDown(UINT nFlags, const Position& pos) = 0 ;
	virtual int OnMouseMove(UINT nFlags, const Position& pos) = 0 ;
	virtual int OnRButtonDown(UINT nFlags, const Position& pos) = 0 ;
	virtual int Cancel() = 0 ;
} ;


///////////////////////////////////////////////////////////////
/*	
 *	CCreateLine
 */
class CCreateLine : public CCommand
{
private:
	Position m_begin;	// 直线的起点
	Position m_end;		// 直线的终点 
public:
	CCreateLine() ;
	~CCreateLine() ;

	int		GetType();
	int		OnLButtonDown(UINT nFlags, const Position& pos) ;
	int		OnMouseMove(UINT nFlags, const Position& pos) ;
	int		OnRButtonDown(UINT nFlags, const Position& pos) ;

	int		Cancel() ;
} ;

///////////////////////////////////////////////////////////////
/*	
 *	CCreateRect
 */
class CCreateRect : public CCommand
{
private:
	Position m_LeftTop;
	Position m_RightBottom;
public:
	CCreateRect() ;
	~CCreateRect() ;

	int		GetType();
	int		OnLButtonDown(UINT nFlags, const Position& pos) ;
	int		OnMouseMove(UINT nFlags, const Position& pos) ;
	int		OnRButtonDown(UINT nFlags, const Position& pos) ;

	int		Cancel() ;
} ;

///////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////
/*	
 *	CCreateArc
 */
class CCreateArc : public CCommand
{
private:
	Position m_center;
	Position m_begin;
	Position m_end ;
public:
	CCreateArc() ;
	~CCreateArc() ;

	int		GetType();
	int		OnLButtonDown(UINT nFlags, const Position& pos) ;
	int		OnMouseMove(UINT nFlags, const Position& pos) ;
	int		OnRButtonDown(UINT nFlags, const Position& pos) ;

	int		Cancel() ;
} ;

class CMove : public CCommand
{
private:
	Position m_basePos;
	Position m_desPos;
public:
	CMove() ;
	~CMove() ;
	
	int		GetType();
	int		OnLButtonDown(UINT nFlags, const Position& pos) ;
	int		OnMouseMove(UINT nFlags, const Position& pos) ;
	int		OnRButtonDown(UINT nFlags, const Position& pos) ;

	int		Cancel() ;
} ;

class CRotate : public CCommand
{
private:
	Position m_basePos;
	Position m_desPos;
public:
	CRotate() ;
	~CRotate() ;
	
	int		GetType();
	int		OnLButtonDown(UINT nFlags, const Position& pos) ;
	int		OnMouseMove(UINT nFlags, const Position& pos) ;
	int		OnRButtonDown(UINT nFlags, const Position& pos) ;

	int		Cancel() ;
} ;

#endif