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function isEmpty = IsEmptyRect(a)
% isEmpty = IsEmptyRect(a)
%
% Returns 1 if the rect "a" is empty, otherwise returns 0.
% "A rectangle is considered empty if the bottom coordinate is less than
% or equal to the top coordinate or if the right coordinate is less than
% or equal to the left." (Apple, Inside Mac)
% Also see PsychRects.
% 7/10/96 dgp Wrote it.
% 8/5/96 dgp check rect size.
if nargin~=1
error('Usage: isEmpty = IsEmptyRect(a)');
end
if size(a,2)~=4
error('Wrong size rect argument. Usage: isEmpty = IsEmptyRect(a)');
end
isEmpty=RectWidth(a)<=0 || RectHeight(a)<=0;
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