CreateEllipticRgn
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.
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