The CreateEllipticRgn function creates an elliptical region.
HRGN CreateEllipticRgn(
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int nLeftRect, |
// x-coordinate of the upper-left corner of the bounding rectangle |
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int nTopRect, |
// y-coordinate of the upper-left corner of the bounding rectangle |
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int nRightRect, |
// x-coordinate of the lower-right corner of the bounding rectangle |
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int nBottomRect |
// y-coordinate of the lower-right corner of the bounding rectangle |
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); |
If the function succeeds, the return value is the handle to the region.
If the function fails, the return value is NULL. To get extended error information, call GetLastError.
A bounding rectangle defines the size, shape, and orientation of the region: The long sides of the rectangle define the length of the ellipse’s major axis; the short sides define the length of the ellipse’s minor axis; and the center of the rectangle defines the intersection of the major and minor axes.
The coordinates of the bounding rectangle are specified in logical units.