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%!PS-Adobe-3.0
%
% ********************************************************************************
%
% Figure 7.6(a) 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 grids - first layer only:
%
% The grating parameters are as follows:
% 
% theta1, theta2 - the grid angles, in degrees.
% p1, p2 - the respective grid periods, in deciinches.
% p1y, p2y - the respective grid periods (perpendicular direction), in 
%	deciinches.
% a1, a2 - the respective internal angles of the 2 grids (normally 90 degrees).
% 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
0.9 centiinch setlinewidth


/len 180 def		% grating length in centiinches
/wid 130 def		% grating width in centiinches
/len2 len 2 div def
/wid2 wid 2 div def


2 inch 3.78 inch translate
gsave


% ****************************************** Fig. (a):

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

/a1 90 def		% internal angle of grid A
/a2 90 def		% internal angle of grid B

/rot 0 def		% general rotation to prevent printer artifacts

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

/p1y 3 def		% period of grid A
/p2y 3 def		% period of grid B

/xshift1 0 p1 mul def		% x period-shift of grid A (e.g. 0.5)
/yshift1 0 p1y mul def		% y period-shift of grid A (e.g. 0.5)
/xshift2 0 p2 mul def		% x period-shift of grid B
/yshift2 0 p2y mul def		% x period-shift of grid B



% Draw first grid:
gsave
2 inch 3.5 inch yshift1 add translate
theta1 rot add rotate
newpath
0 p1 len		% draw lines
{centiinch len2 p1 div round p1 mul xshift1 sub centiinch sub wid2 centiinch neg moveto
0 centiinch wid centiinch rlineto} for
stroke
grestore

gsave
2 inch xshift1 add 3.5 inch translate
a1 theta1 add rot add rotate
newpath
0 p1y len		% draw lines
{centiinch len2 p1y div round p1y mul yshift1 sub centiinch sub wid2 centiinch neg moveto
0 centiinch wid centiinch rlineto} for
stroke
grestore

gsave
/Helvetica findfont
9 scalefont setfont
2 inch 3.5 inch translate
theta1 rot add rotate
-1.01 inch -0.65 inch moveto
(A) show
-0.75 inch -0.905 inch moveto
(B) show
grestore


gsave
/Times-Roman findfont
12 scalefont setfont
2 inch 3.5 inch translate
-0.04 inch -1.15 inch moveto
((a)) show
grestore



% draw white cross:
gsave
2 inch 3.5 inch translate
newpath
0.1 inch 0.01 inch moveto
0 inch -0.02 inch rlineto
-0.09 inch 0 inch rlineto
0 inch -0.09 inch rlineto
-0.02 inch 0 inch rlineto
0 inch 0.09 inch rlineto
-0.09 inch 0 inch rlineto
0 inch 0.02 inch rlineto
0.09 inch 0 inch rlineto
0 inch 0.09 inch rlineto
0.02 inch 0 inch rlineto
0 inch -0.09 inch rlineto
closepath
1 setgray
fill
grestore



gsave
-0.25 inch -1.5 inch translate
0 inch 0 inch moveto
/Times-Bold findfont
12 scalefont setfont
(Figure 7.6(a)) 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
((First layer only.)) show
grestore



grestore

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