一般用 R2_NOT, 在畫第二次時就會把第一次畫的清為底色
afx_msg void OnMouseMove(UINT, CPoint point)
{
if (this == GetCapture() )
{
CClientDC aDC(this);
aDC.SetROP2(R2_NOT);
aShape->draw(aDC);
aShape->SetEndPoint(point);
aShape->draw(aDC, lcolor);
}
}
- R2_BLACK Pixel is always black.
- R2_WHITE Pixel is always white.
- R2_NOP Pixel remains unchanged.
- R2_NOT Pixel is the inverse of the screen color.
- R2_COPYPEN Pixel is the pen color.
- R2_NOTCOPYPEN Pixel is the inverse of the pen color.
- R2_MERGEPENNOT Pixel is a combination of the pen color and the inverse of the screen color (final pixel = (NOT screen pixel) OR pen).
- R2_MASKPENNOT Pixel is a combination of the colors common to both the pen and the inverse of the screen (final pixel = (NOT screen pixel) AND pen).
- R2_MERGENOTPEN Pixel is a combination of the screen color and the inverse of the pen color (final pixel = (NOT pen) OR screen pixel).
- R2_MASKNOTPEN Pixel is a combination of the colors common to both the screen and the inverse of the pen (final pixel = (NOT pen) AND screen pixel).
- R2_MERGEPEN Pixel is a combination of the pen color and the screen color (final pixel = pen OR screen pixel).
- R2_NOTMERGEPEN Pixel is the inverse of the R2_MERGEPEN color (final pixel = NOT(pen OR screen pixel)).
- R2_MASKPEN Pixel is a combination of the colors common to both the pen and the screen (final pixel = pen AND screen pixel).
- R2_NOTMASKPEN Pixel is the inverse of the R2_MASKPEN color (final pixel = NOT(pen AND screen pixel)).
- R2_XORPEN Pixel is a combination of the colors that are in the pen or in the screen, but not in both (final pixel = pen XOR screen pixel).
- R2_NOTXORPEN Pixel is the inverse of the R2_XORPEN color (final pixel = NOT(pen XOR screen pixel)).
