ClientToScreen 和ScreenToClient 用法

ClientToScreen( )是把窗口坐标转换为屏幕坐标

ScreenToClient( )是把屏幕坐标转换为窗口坐标

屏幕坐标是相对于屏幕左上角的，而窗口坐标是相对于窗口用户区左上角的

VC下，有些函数使用窗口坐标，有些使用屏幕坐标，使用时要分清。





一个窗体分为两部分：系统区和客户区

象标题和菜单之类的是系统区，由系统来控制，客户区就是你的地盘喽！！！

Width, Height 是指整体的，ClientWidth, ClientHeight是指客户区的，两者相减就是

系统区的啦！！！

ClientToScreen是把坐标从当前窗体转化成全屏幕的！！！

ScreenToClient是把屏幕坐标转化成相对当前窗体的坐标！！！！

 

 //Resize window to proper size based on video standard

 CRect recDstD1( 0, 0, 720, 576 );  

 static_preview_window.ClientToScreen(&recDstD1); //    recDstD1 {top=53 bottom=629 left=200 right=920} CRect



 static_preview_window.SetWindowPos(&CWnd::wndBottom, recDstD1.left, recDstD1.top, recDstD1.right - recDstD1.left + 10, new_height + 10, SWP_NOMOVE | SWP_SHOWWINDOW); 

 

bool   m_bIsLButtonDawn =false;



void CDrawDlg::OnMouseMove(UINT nFlags, CPoint point)


{

// TODO: Add your message handler code here and/or call default

CWnd *pwnd=GetDlgItem(IDC_EDIT1);

     CDC *pdc=pwnd->GetDC();

CRect rect;

this->ClientToScreen(&point);

pwnd->ScreenToClient(&point);

pwnd->GetClientRect(&rect);



//   HCURSOR hcur=::LoadCursorFromFile("pen.cur");


//   SetClassLong(GetSafeHwnd(),GCL_HCURSOR,(LONG)hcur);  



// CPen pen(PS_INSIDEFRAME,-1,RGB(255,255,255));

//      CPen* olePen=pdc->SelectObject(&pen);

if(rect.PtInRect(point) &&   m_bIsLButtonDawn )


{



   pdc->DPtoLP(&m_fp);

   pdc->MoveTo(m_fp);

   pdc->DPtoLP(&point);

   pdc->LineTo(point);



}

   m_fp=point;

//   pdc->SelectObject(olePen);

ReleaseDC(pdc);

CDialog::OnMouseMove(nFlags, point);

}



void CDrawDlg::OnLButtonUp(UINT nFlags, CPoint point)


{

   m_bIsLButtonDawn =false;

// TODO: Add your message handler code here and/or call default

/**//*

    CWnd *pwnd=GetDlgItem(IDC_EDIT1);

      CDC *pdc=pwnd->GetDC();

   CRect rect;

   this->ClientToScreen(&point);

   pwnd->ScreenToClient(&point);

   pwnd->GetClientRect(&rect);

  

   if(rect.PtInRect(point))

   {

    pdc->DPtoLP(&m_fp);

    pdc->MoveTo(m_fp);

    pdc->DPtoLP(&point);

    pdc->LineTo(point);



   }

   ReleaseDC(pdc);*/



CDialog::OnLButtonUp(nFlags, point);

}



void CDrawDlg::OnLButtonDown(UINT nFlags, CPoint point)


{

// TODO: Add your message handler code here and/or call default

CWnd *pwnd=GetDlgItem(IDC_EDIT1);

CDC *pDC=pwnd->GetDC();

CRect rect;

this->ClientToScreen(&point);

pwnd->ScreenToClient(&point);

pwnd->GetClientRect(&rect);

if(rect.PtInRect(point))


{

   m_fp.x=point.x;

   m_fp.y=point.y;

}

ReleaseDC(pDC);

   m_bIsLButtonDawn =true;

CDialog::OnLButtonDown(nFlags, point);