选择一块区域的实现方法

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　　就象画笔中拖动鼠标，画出一个矩形，该区域被选择。有没有现成的例子？我给你一个：年轻的时候写的，有些变量的意义自己想吧，我记不得了。 void CMyView::OnLButtonDown(UINT nFlags, CPoint point) { if (!isrect) { startpoint=point; temppoint=point; flags=TRUE; } CView::OnLButtonDown(nFlags, point); } void CMyView::OnLButtonUp(UINT nFlags, CPoint point) { flags=FALSE; CView::OnLButtonUp(nFlags, point); } void CMyView::OnMouseMove(UINT nFlags, CPoint point) { if (flags) { CDC *pDC=GetDC(); CRect rect(startpoint.x, startpoint.y, temppoint.x, temppoin t.y); rect.NormalizeRect(); pDC->DrawFocusRect(rect); rect.SetRect(startpoint.x, startpoint.y, point.x, point.y); rect.NormalizeRect(); pDC->DrawFocusRect(rect); temppoint=point; isrect=TRUE; ReleaseDC(pDC); } CView::OnMouseMove(nFlags, point); } void CMyView::OnRButtonUp(UINT nFlags, CPoint point) { if(isrect) { CDC *pDC=GetDC(); CRect rect(startpoint.x, startpoint.y, temppoint.x, temppoin t.y); rect.NormalizeRect(); pDC->DrawFocusRect(rect); ReleaseDC(pDC); isrect=FALSE; } CView::OnRButtonUp(nFlags, point); } 　　就象画笔中拖动鼠标，画出一个矩形，该区域被选择。有没有现成的例子？我给你一个：年轻的时候写的，有些变量的意义自己想吧，我记不得了。 void CMyView::OnLButtonDown(UINT nFlags, CPoint point) { if (!isrect) { startpoint=point; temppoint=point; flags=TRUE; } CView::OnLButtonDown(nFlags, point); } void CMyView::OnLButtonUp(UINT nFlags, CPoint point) { flags=FALSE; CView::OnLButtonUp(nFlags, point); } void CMyView::OnMouseMove(UINT nFlags, CPoint point) { if (flags) { CDC *pDC=GetDC(); CRect rect(startpoint.x, startpoint.y, temppoint.x, temppoin t.y); rect.NormalizeRect(); pDC->DrawFocusRect(rect); rect.SetRect(startpoint.x, startpoint.y, point.x, point.y); rect.NormalizeRect(); pDC->DrawFocusRect(rect); temppoint=point; isrect=TRUE; ReleaseDC(pDC); } CView::OnMouseMove(nFlags, point); } void CMyView::OnRButtonUp(UINT nFlags, CPoint point) { if(isrect) { CDC *pDC=GetDC(); CRect rect(startpoint.x, startpoint.y, temppoint.x, temppoin t.y); rect.NormalizeRect(); pDC->DrawFocusRect(rect); ReleaseDC(pDC); isrect=FALSE; } CView::OnRButtonUp(nFlags, point); } 下载本文示例代码


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