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CreateEllipticRgn info  Overview  Group

The CreateEllipticRgn function creates an elliptical region.

HRGN CreateEllipticRgn(

    int nLeftRect,

// x-coordinate of the upper-left corner of the bounding rectangle

    int nTopRect,

// y-coordinate of the upper-left corner of the bounding rectangle

    int nRightRect,

// x-coordinate of the lower-right corner of the bounding rectangle

    int nBottomRect 

// y-coordinate of the lower-right corner of the bounding rectangle

   );

Parameters

nLeftRect
Specifies the x-coordinate of the upper-left corner of the bounding rectangle of the ellipse.
nTopRect
Specifies the y-coordinate of the upper-left corner of the bounding rectangle of the ellipse.
nRightRect
Specifies the x-coordinate of the lower-right corner of the bounding rectangle of the ellipse.
nBottomRect
Specifies the y-coordinate of the lower-right corner of the bounding rectangle of the ellipse.

Return Values

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.

Remarks

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.

See Also

CreateEllipticRgnIndirect, DeleteObject, SelectObject 

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