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CreateEllipticRgn function

The CreateEllipticRgn function creates an elliptical region.

Syntax


HRGN CreateEllipticRgn(
  _In_  int nLeftRect,
  _In_  int nTopRect,
  _In_  int nRightRect,
  _In_  int nBottomRect
);

Parameters

nLeftRect [in]

Specifies the x-coordinate in logical units, of the upper-left corner of the bounding rectangle of the ellipse.

nTopRect [in]

Specifies the y-coordinate in logical units, of the upper-left corner of the bounding rectangle of the ellipse.

nRightRect [in]

Specifies the x-coordinate in logical units, of the lower-right corner of the bounding rectangle of the ellipse.

nBottomRect [in]

Specifies the y-coordinate in logical units, of the lower-right corner of the bounding rectangle of the ellipse.

Return value

If the function succeeds, the return value is the handle to the region.

If the function fails, the return value is NULL.

Remarks

When you no longer need the HRGN object, call the DeleteObject function to delete it.

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.

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Wingdi.h (include Windows.h)

Library

Gdi32.lib

DLL

Gdi32.dll

See also

Regions Overview
Region Functions
CreateEllipticRegnIndirect
DeleteObject
SelectObject

 

 

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