lineview.h

实现DC画线的鼠标任意拖动,适合初学VC者.

// LineView.h : interface of the CLineView class
//
/////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_LINEVIEW_H__C955253E_A512_4464_83D4_3384D9F27B58__INCLUDED_)
#define AFX_LINEVIEW_H__C955253E_A512_4464_83D4_3384D9F27B58__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#include "Line1.h"
class CLineView : public CView
{
protected: // create from serialization only
	CLineView();
	DECLARE_DYNCREATE(CLineView);

// Attributes
public:
	CLineDoc* GetDocument();
    
// Operations
public:
   
// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CLineView)
	public:
	virtual void OnDraw(CDC* pDC);  // overridden to draw this view
	virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
	protected:
	virtual BOOL OnPreparePrinting(CPrintInfo* pInfo);
	virtual void OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo);
	virtual void OnEndPrinting(CDC* pDC, CPrintInfo* pInfo);
	//}}AFX_VIRTUAL

// Implementation
public:
	
	double PointLineDistance(CPoint p1,CPoint p2,CPoint p3);//点p1到由p2 p3组成的直线之间的距离
	double Distance(CPoint p1,CPoint p2);//两个点之间的距离。

	CLine m_line;
	BOOL m_LButtonUp;
	BOOL m_LButtondown;
	virtual ~CLineView();
#ifdef _DEBUG
	virtual void AssertValid() const;
	virtual void Dump(CDumpContext& dc) const;
#endif

protected:

// Generated message map functions
protected:
	BOOL m_online;
	//{{AFX_MSG(CLineView)
	afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
	afx_msg void OnMouseMove(UINT nFlags, CPoint point);
	afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
private:
	BOOL DrawMark;
	BOOL m_onPoint2;
	CPoint P3;
	BOOL m_onPoint1;
	int m_LineNum;
	BOOL m_mDrawline;
	CStatic m_mPiccontrol;
	CFont m_font;
};

#ifndef _DEBUG  // debug version in LineView.cpp
inline CLineDoc* CLineView::GetDocument()
   { return (CLineDoc*)m_pDocument; }
#endif

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_LINEVIEW_H__C955253E_A512_4464_83D4_3384D9F27B58__INCLUDED_)