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function drawbox (r1,r2,c1,c2,color,w,e)
%DRAWBOX draw a box around a submatrix in the figure.
% Used by cspy, cs_dmspy, and ccspy.
% Example:
% drawbox (r1,r2,c1,c2,color,w,e)
% See also drawboxes, plot
% Copyright 2006-2012, Timothy A. Davis, http://www.suitesparse.com
if (r1 == r2 | c1 == c2) %#ok
return
end
if (e == 1)
r1 = r1 - .5 ;
r2 = r2 - .5 ;
c1 = c1 - .5 ;
c2 = c2 - .5 ;
else
r1 = ceil (r1 / e) - .5 ;
r2 = ceil ((r2 - 1) / e) + .5 ;
c1 = ceil (c1 / e) - .5 ;
c2 = ceil ((c2 - 1) / e) + .5 ;
end
if (c2 > c1 | r2 > r1) %#ok
plot ([c1 c2 c2 c1 c1], [r1 r1 r2 r2 r1], color, 'LineWidth', w) ;
end
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