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%!PS-Adobe-3.0
%
% ********************************************************************************
%
% Figure 2.13(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 dot-screens - first layer only:
%
% The screen parameters are as follows:
% 
% theta1, theta2 - the screen angles, in degrees.
% p1, p2  - the respective screen periods (main direction), in deciinches.
% p1y, p2y - the respective screen periods (perpendicular direction), in 
%	deciinches.
% xshifti, yshifti - the respective period-shifts for the i-th screen, in terms
%	of period fractions.
% len - the length (and width) of each of the screens, in centiinches.
%
% ********************************************************************************
%


/inch {72 mul} def
/centiinch {0.72 mul} def
1 centiinch setlinewidth


1 setlinecap


/len 200 def		% screen length in centiinches
/len2 len 2 div def


/Helvetica findfont
10 scalefont setfont


3.15 inch 4.9 inch translate
gsave


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

/theta1 0 def		% angle of screen A
/theta2 5 def		% angle of screen B

/rot 0 def		% general rotation to prevent printer artifacts

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

/p1y 3 1 mul def		% period of screen A (in the perpendicular direction)
/p2y 3 1 mul def		% period of screen B (in the perpendicular direction)

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


% Draw screen A:
gsave
1 inch 2.5 inch translate
theta1 rot add rotate
0 p1y len		% draw rows of dots
{newpath
	/ysave exch centiinch len2 p1y div round p1y mul yshift1 sub centiinch sub def
	0 p1 len		% draw a row of dots
	{centiinch len2 p1 div round p1 mul xshift1 sub centiinch sub ysave moveto
	0 0 rlineto} for
	stroke
} for
-1.12 inch -1.0 inch moveto
(A) show
grestore


gsave
-1.3 inch -2.5 inch translate
0 inch 0 inch moveto
/Times-Bold findfont
12 scalefont setfont
(Figure 2.13(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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