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%!PS-Adobe-3.0
%
% ********************************************************************************
%
% Figure 2.8(e) from the book: "The Theory of the Moire Phenomenon"
% by I. Amidror, published by Kluwer Academic Publishers, 1999.
%
%		* * *  Copyright (c) 1999 EPFL  * * *
%
% Author: I. Amidror
%
% Modified: June 9, 1999
%
% ********************************************************************************
%
% Superpositions of 2 line gratings - second layer only:
%
% The grating parameters are as follows:
% 
% theta1, theta2 - the grating angles, in degrees.
% p1, p2 - the respective grating periods, in deciinches.
% xshifti - the period-shifts for the i-th grating, in terms of period fractions.
% len - the length of each of the gratings, in centiinches.
% wid - the width of each of the gratings, in centiinches.
%
% ********************************************************************************
%


0.7 setlinewidth


/len 170 def		% grating length in centiinches
/wid 120 def		% grating width in centiinches
/len2 len 2 div def
/wid2 wid 2 div def

400 400 translate
gsave


% ******************************** Fig. (e):


/theta1 0 def		% angle of grating A
/theta2 6 def		% angle of grating B

/rot 0 def		% general rotation to prevent printer artifacts

/p1 3 def		% period of grating A
/p2 3 def		% period of grating B

/xshift1 0.33 p1 mul def	% period-shift of grating A (e.g. 0.5)
/xshift2 0 p2 mul def		% period-shift of grating A (e.g. 0.5)


% Draw grating B:
gsave
0 0 translate
theta2 rot add rotate
newpath
0 p2 len		% draw lines
{len2 p2 div round p2 mul xshift2 sub sub wid2 neg moveto
0 wid rlineto} for
stroke
grestore
showpage