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();
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();
并没有消掉,我试过了的
pen.CreatePen(PS_SOLID, 1, RGB(200,0,0)); OldPen = pDC->SelectObject(&pen);
dc.SetROP2(R2_NOT);//是用Not的 pDC->MoveTo(10,10);
pDC->LineTo(200,200); pDC->SelectObject(OldPen);
pen.DeleteObject();
R2_NOT
来画,画线的颜色总是黑色呢?
R2_NOT表示反色绘图 ClientDC.SetROP2(R2_NOT);
ClientDC.MoveTo(s_PointBegin);
ClientDC.LineTo(s_PointEnd);
ClientDC.SetROP2(R2_COPYPEN);
ClientDC.MoveTo(s_PointBegin);
ClientDC.LineTo(point);
这是一段简单的绘图语句,擦除上次的线后从新绘制