In MFC:
If I use CBrush like "CBrush brush; CDC* pDC = GetDC();pDC->Ellipse(start.x,start.y,end.x,end.y);",
what color of the ellipse's interior will be?
You're not using the brush or assigning it anything; it's simply a variable declaration. It serves absolutely no purpose, so you'd see whatever color was set for the brush in pDC
.
If you've done nothing to change it, the interior of the ellipsis will be whatever the default background color is for the device context in pDC
.