if (flag_2&&(nFlags && MK_LBUTTON))
{
CGdiObject *pOldObject=dc.SelectStockObject(NULL_BRUSH);
dc.SetROP2(R2_NOT);
int nDrawmode=dc.GetROP2();
dc.Ellipse(m_EndPoint.x,m_EndPoint.y,m_StartPoint.x,m_StartPoint.y);
dc.SetROP2(nDrawmode);
dc.Ellipse(m_StartPoint.x,m_StartPoint.y,point.x,point.y);
dc.SelectObject(pOldObject);
m_EndPoint=point;
}
{
CGdiObject *pOldObject=dc.SelectStockObject(NULL_BRUSH);
dc.SetROP2(R2_NOT);
int nDrawmode=dc.GetROP2();
dc.Ellipse(m_EndPoint.x,m_EndPoint.y,m_StartPoint.x,m_StartPoint.y);
dc.SetROP2(nDrawmode);
dc.Ellipse(m_StartPoint.x,m_StartPoint.y,point.x,point.y);
dc.SelectObject(pOldObject);
m_EndPoint=point;
}
解决方案 »
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