状态栏，鼠标拖动画边框.txt

VC＋＋实现在鼠标在打开的图像上拖动

void CMultusefulView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default

	CMultusefulDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);

	m_draging = 1;
	m_dragcretflag = 1;
	m_firstx = point.x;
	m_firsty = point.y;

	pDoc->m_Emlx = point.x;
	pDoc->m_Emly = point.y;

//	AddCross(pDoc->img,pDoc->Row,pDoc->Col,point.x,point.y);
		//在状态条上显示图象大小
	char string[100];
	wsprintf(string,"图像:%d行%d列",pDoc->Row,pDoc->Col);
	CStatusBar* pStatusBar=(CStatusBar*)AfxGetMainWnd()->GetDescendantWindow(AFX_IDW_STATUS_BAR);
	pStatusBar->SetPaneText(pStatusBar->CommandToIndex(ID_INDICATOR_IMAGESIZE),LPCSTR(string));

			wsprintf(string,"选定位置:X=%d Y=%d",point.x,point.y);
		pStatusBar=(CStatusBar*)AfxGetMainWnd()->GetDescendantWindow(AFX_IDW_STATUS_BAR);
		pStatusBar->SetPaneText(pStatusBar->CommandToIndex(ID_INDICATOR_POINT),LPCSTR(string));
		//状态条上显示选定得位置坐标
	if(point.x < pDoc->Col && point.y < pDoc->Row)
	{
		m_btnPressed = true ; 
		m_startP = point ; 
		wsprintf(string,"灰度:%d",pDoc->img[point.y*pDoc->Col + point.x]);
		pStatusBar=(CStatusBar*)AfxGetMainWnd()->GetDescendantWindow(AFX_IDW_STATUS_BAR);
		pStatusBar->SetPaneText(pStatusBar->CommandToIndex(ID_INDICATOR_GRAY),LPCSTR(string));
	}	
//	   Invalidate(TRUE);

	CScrollView::OnLButtonDown(nFlags, point);

}


void CMultusefulView::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if(m_draging)
	{
		m_draging = 0;
		m_dragcretflag = 1;
		m_lastx = point.x;
		m_lasty = point.y;
		ClipCursor(NULL);
	}

	m_endP = point ;
	
	if(m_btnPressed)
		m_btnPressed = false; 
//    Invalidate();
	CScrollView::OnLButtonUp(nFlags, point);
}

void CMultusefulView::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
   CMultusefulDoc *pDoc = GetDocument() ; 
   ASSERT_VALID(pDoc) ;	

   if(point.x>pDoc->Col || point.y>pDoc->Row)
	   return;				// 至关重要！！！！！！！！！

		//在状态条上显示鼠标位置
	m_lastx = point.x;
	m_lasty = point.y;
	char string[100];
	wsprintf(string,"鼠标位置:X=%d Y=%d",point.x,point.y);
	CStatusBar* pStatusBar=(CStatusBar*)AfxGetMainWnd()->GetDescendantWindow(AFX_IDW_STATUS_BAR);
	pStatusBar->SetPaneText(pStatusBar->CommandToIndex(ID_INDICATOR_MOUSE),LPCSTR(string));
//	if(m_draging==1)
//		Invalidate();

	if(m_btnPressed) 
{ 
   CDC *pDC = GetDC() ; 
   CMultusefulDoc *pDoc = GetDocument() ; 
  ASSERT_VALID(pDoc) ; 
  m_endP = point ; 
  rect.SetRect(m_startP,m_endP) ; 
   pDoc->m_recTk.DrawTrackerRect(&rect,AfxGetMainWnd(),pDC,AfxGetMainWnd()) ; 

	wsprintf(string,"所选区域大小：dx=%d dy=%d",abs(rect.right-rect.left),abs(rect.bottom-rect.top));
	pStatusBar=(CStatusBar*)AfxGetMainWnd()->GetDescendantWindow(AFX_IDW_STATUS_BAR);
	pStatusBar->SetPaneText(pStatusBar->CommandToIndex(ID_INDICATOR_RECT),LPCSTR(string));
/*  	CPen pen(PS_DASH,1,RGB(255,0,0));
	pDC->SelectObject(&pen);
	pDC->Rectangle(rect);
*/	
  ReleaseDC(pDC); 

} 

	//	CScrollView::OnMouseMove(nFlags, point);
}


















	int m_dragcretflag;		// 画矩形框的标志位
	int m_lasty;	// 选中框结束点坐标
	int m_lastx;
	int m_firsty;	// 选中框起始点坐标
	int m_firstx;
	int m_draging;	// 判断鼠标是否按下
	bool m_btnPressed; 
	CPoint m_endP; 
	CPoint m_startP; 
	CRect rect ; 





	m_draging = 0;
	m_dragcretflag = 0;		// 画矩形框的标志位
	m_lasty = 0;	// 选中框结束点坐标
	m_lastx = 0;
	m_firsty = 0;	// 选中框起始点坐标
	m_firstx = 0;
	m_btnPressed = false;