选择一块区域的实现方法

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);

}