ClientToScreen 和 ScreenToClient
2011-06-20 01:52
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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!!!!
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); }
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