画了条直线,怎么通过设置异或后,再把它画一次的方法来在视觉上消掉这条直线?
如下画线:
CPen pen,*OldPen;
pen.CreatePen(PS_SOLID, 1, RGB(200,0,0));
OldPen = pDC->SelectObject(&pen);
// pDC->SetROP2(R2_XORPEN);
pDC->MoveTo(10,10);
pDC->LineTo(200,200);
pDC->SelectObject(OldPen);
pen.DeleteObject();