Dans les API, il y a
The Ellipse function draws an ellipse. The center of the ellipse is the center of the specified bounding rectangle. The ellipse is outlined by using the current pen and is filled by using the current brush.
BOOL Ellipse(
HDC hdc, // handle to device context
int nLeftRect, // x-coord. of bounding rectangle's upper-left corner
int nTopRect, // y-coord. of bounding rectangle's upper-left corner
int nRightRect, // x-coord. of bounding rectangle's lower-right corner
int nBottomRect // y-coord. bounding rectangle's f lower-right corner
);