CRect::IsRectEmpty

Determines whether CRect is empty.

BOOL IsRectEmpty( ) const throw( );

Return Value

Nonzero if CRect is empty; 0 if CRect is not empty.

Remarks

A rectangle is empty if the width and/or height are 0 or negative. Differs from IsRectNull, which determines whether all coordinates of the rectangle are zero.

备注

The rectangle must be normalized or this function may fail. You can call NormalizeRect to normalize the rectangle before calling this function.

Example

CRect rectNone(0, 0, 0, 0);
CRect rectSome(35, 50, 135, 150);

ASSERT(rectNone.IsRectEmpty());
ASSERT(!rectSome.IsRectEmpty());

CRect rectEmpty(35, 35, 35, 35);
ASSERT(rectEmpty.IsRectEmpty());   

Requirements

Header: atltypes.h

See Also

Concepts

CRect Class

CRect Members

Hierarchy Chart

CRect::IsRectNull

CRect::SetRectEmpty

CRect::NormalizeRect

IsRectEmpty