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%!PS-Adobe-3.0
%
% ********************************************************************************
%
% Figure 2.8(h) 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 3 line gratings:
%
% The grating parameters are as follows - third layer only:
% 
% theta1, theta2, theta3 - the grating angles, in degrees.
% p1, p2, p3 - 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.
%
% ********************************************************************************
%


/inch {72 mul} def
/centiinch {0.72 mul} def
0.7 centiinch 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


/Helvetica findfont
9 scalefont setfont


0.05 inch 1.45 inch translate
gsave


% ******************************** Fig. (h):

/theta1 0 def		% angle of grating A
/theta2 120.0 def	% angle of grating A
/theta3 244.5 def	% angle of grating A

/rot 0 def		% general rotation to prevent printer artifacts

/p1 3 def		% period of grating A
/p2 3 def		% period of grating B
/p3 3 def		% period of grating C

/xshift1 0.5 p1 mul def		% period-shift of grating A (e.g. 0.5)
/xshift2 0 p2 mul def		% period-shift of grating B
/xshift3 0 p3 mul def		% period-shift of grating C


% Draw grating C:
gsave
4.1 inch 6 inch translate
theta3 rot add rotate
newpath
0 p3 len		% draw lines
{centiinch len2 p3 div round p3 mul xshift3 sub centiinch sub wid2 centiinch neg moveto
0 centiinch wid centiinch rlineto} for
stroke
-0.95 inch -0.62 inch moveto
(C) show
grestore


gsave
4.1 inch 6 inch translate
-0.08 inch -1.25 inch moveto
/Times-Roman findfont
12 scalefont setfont
((h)) show
grestore




gsave
1.85 inch 1 inch translate
0 inch 0 inch moveto
/Times-Bold findfont
12 scalefont setfont
(Figure 2.8(h)) show
/Times-Roman findfont
12 scalefont setfont
( from the book: ) show
/Times-Italic findfont
12 scalefont setfont
(The Theory of the Moire) show
-0.06 inch 0 inch rmoveto
(\302 Phenomenon) show
/Times-Roman findfont
12 scalefont setfont
0 inch -0.25 inch moveto
(    by I. Amidror, published by Kluwer Academic Publishers, 1999.) show
1.7 inch -0.65 inch moveto
((Third layer only.)) show
grestore




grestore

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