画矩形，请大家帮忙！！！

Question

怎样通过OnMouseMove,LButtonDown,LButtonUp这三个函数在Ocx控件上画出矩形，好急好急，请大家帮帮我！！！！！！！！！

Answer 1

呵呵，刚刚做完一个画矩形
void C3DCityBuilderView::OnLButtonDown(UINT nFlags, CPoint point) 
{
// TODO: Add your message handler code here and/or call default

m_bIsLButtonDown = TRUE;
m_OldPoint = point;
LButtonDownPoint = point; switch (m_curTool)
{

case ID_MAP_SELECT:
if(curSelectMove != NULL)
SetCursor(curSelectMove);
break;

case ID_MAP_ZOOMIN:
if(curZoomInMove != NULL)
SetCursor(curZoomInMove);
break;

case ID_MAP_ZOOMOUT:
if(curZoomOutMove != NULL)
SetCursor(curZoomOutMove);
break; case ID_MAP_PAN:
if(curPanMove != NULL)
SetCursor(curPanMove);
break; default:
SetCursor(AfxGetApp()->LoadStandardCursor(IDC_ARROW));
break;

}
CView::OnLButtonDown(nFlags, point);
}///////////////////////////////////////////////////////////////////////////void C3DCityBuilderView::OnMouseMove(UINT nFlags, CPoint point) 
{
// TODO: Add your message handler code here and/or call default
CDC *pdc = GetDC();
CRect rect; if(m_bIsLButtonDown)
{ switch (m_curTool)
{
case ID_MAP_SELECT:
if(curSelectMove != NULL)
// SetCursor(curSelectMove);
break;

case ID_MAP_ZOOMIN:
if(curZoomInMove != NULL)
SetCursor(curZoomInMove);
DrawRect(pdc,point); break;

case ID_MAP_ZOOMOUT:
if(curZoomOutMove != NULL)
SetCursor(curZoomOutMove);
DrawRect(pdc,point);

break;

case ID_MAP_PAN:
if(curPanMove != NULL)
SetCursor(curPanMove);
break;

default:
SetCursor(AfxGetApp()->LoadStandardCursor(IDC_ARROW));
break;

}
}
ReleaseDC(pdc);
CView::OnMouseMove(nFlags, point);
}
///////////////////////////////////////////////////////////////////////////
void C3DCityBuilderView::OnLButtonUp(UINT nFlags, CPoint point) 
{
// TODO: Add your message handler code here and/or call default
LButtonUpPoint = point;}///////////////////////////////////////////////////////////////////////////
/*$功能:用于绘制放大，缩小的边框$*/
void C3DCityBuilderView::DrawRect(CDC * pdc,CPoint point)
{ CRect rect;
rect.SetRect(LButtonDownPoint.x, LButtonDownPoint.y, m_OldPoint.x, m_OldPoint.y);
if(m_bIsLButtonDown == 100)
{
rect.NormalizeRect();
pdc->DrawFocusRect(&rect);
}
else 
m_bIsLButtonDown = 100;

rect.SetRect(LButtonDownPoint.x,LButtonDownPoint.y,point.x,point.y);
rect.NormalizeRect();
pdc->DrawFocusRect(&rect);
m_OldPoint = point;
}