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CreateRoundRectRgn function

The CreateRoundRectRgn function creates a rectangular region with rounded corners.

Syntax


HRGN CreateRoundRectRgn(
  _In_ int nLeftRect,
  _In_ int nTopRect,
  _In_ int nRightRect,
  _In_ int nBottomRect,
  _In_ int nWidthEllipse,
  _In_ int nHeightEllipse
);

Parameters

nLeftRect [in]

Specifies the x-coordinate of the upper-left corner of the region in device units.

nTopRect [in]

Specifies the y-coordinate of the upper-left corner of the region in device units.

nRightRect [in]

Specifies the x-coordinate of the lower-right corner of the region in device units.

nBottomRect [in]

Specifies the y-coordinate of the lower-right corner of the region in device units.

nWidthEllipse [in]

Specifies the width of the ellipse used to create the rounded corners in device units.

nHeightEllipse [in]

Specifies the height of the ellipse used to create the rounded corners in device units.

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.

Region coordinates are represented as 27-bit signed integers.

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
CreatePolygonRgn
CreatePolyPolygonRgn
CreateRectRgn
CreateRectRgnIndirect
ExtCreateRegion
GetRegionData
DeleteObject
SelectObject

 

 

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