HRGN CreateEllipticRgn(X1, Y1, X2, Y2)
This function creates an elliptical region.
| Parameter | Type/Description | |
| X1 | int Specifies the x-coordinate of the upper-left corner of the bounding rectangle of the ellipse. | |
| Y1 | int Specifies the y-coordinate of the upper-left corner of the bounding rectangle of the ellipse. | |
| X2 | int Specifies the x-coordinate of the lower-right corner of the bounding rectangle of the ellipse. | |
| Y2 | int Specifies the y-coordinate of the lower-right corner of the bounding rectangle of the ellipse. |
The return value identifies a new region if the function is successful. Otherwise, it is NULL.
The width of the rectangle, specified by the absolute value of X2 – X1, must not exceed 32,767 units. This limit also applies to the height of the rectangle.