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%!PS-Adobe-3.0
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% ********************************************************************************
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% Figure 4.3(top) 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
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% ********************************************************************************
%
% (a), (b), (c) - Superpositions of 2 dot-screens:
%
% 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
1.2 centiinch setlinewidth
1 setlinecap
/len 150 def % screen length in centiinches
/len2 len 2 div def
/Helvetica findfont
10 scalefont setfont
3.2 inch 1.15 inch translate
gsave
90 rotate
% ************************************** Fig. (a):
/theta1 0 def % angle of screen A
/theta2 30 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 def % period of screen A (in the perpendicular direction)
/p2y 3 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
2 inch 0 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
-0.9 inch -0.75 inch moveto
(A) show
grestore
% Draw screen B:
gsave
2 inch 0 inch translate
theta2 rot add rotate
0 p2y len % draw rows of dots
{newpath
/ysave exch centiinch len2 p2y div round p2y mul yshift2 sub centiinch sub def
0 p2 len % draw a row of dots
{centiinch len2 p2 div round p2 mul xshift2 sub centiinch sub ysave moveto
0 0 rlineto} for
stroke
} for
-0.9 inch -0.75 inch moveto
(B) show
grestore
gsave
2 inch 0 inch translate
/Times-Roman findfont
12 scalefont setfont
-0.07 inch -1.2 inch moveto
((a)) show
grestore
% ****************************************** Fig. (b):
/theta1 0 def % angle of screen A
/theta2 34.5 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 def % period of screen A (in the perpendicular direction)
/p2y 3 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
5 inch 0 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
-0.9 inch -0.75 inch moveto
(A) show
grestore
% Draw screen B:
gsave
5 inch 0 inch translate
theta2 rot add rotate
0 p2y len % draw rows of dots
{newpath
/ysave exch centiinch len2 p2y div round p2y mul yshift2 sub centiinch sub def
0 p2 len % draw a row of dots
{centiinch len2 p2 div round p2 mul xshift2 sub centiinch sub ysave moveto
0 0 rlineto} for
stroke
} for
-0.9 inch -0.75 inch moveto
(B) show
grestore
gsave
5 inch 0 inch translate
/Times-Roman findfont
12 scalefont setfont
-0.07 inch -1.2 inch moveto
((b)) show
grestore
% ****************************************** Fig. (c):
/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 def % period of screen A (in the perpendicular direction)
/p2y 3 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
8 inch 0 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
-0.9 inch -0.75 inch moveto
(A) show
grestore
% Draw screen B:
gsave
8 inch 0 inch translate
theta2 rot add rotate
0 p2y len % draw rows of dots
{newpath
/ysave exch centiinch len2 p2y div round p2y mul yshift2 sub centiinch sub def
0 p2 len % draw a row of dots
{centiinch len2 p2 div round p2 mul xshift2 sub centiinch sub ysave moveto
0 0 rlineto} for
stroke
} for
-0.9 inch -0.8 inch moveto
(B) show
grestore
gsave
8 inch 0 inch translate
/Times-Roman findfont
12 scalefont setfont
-0.07 inch -1.2 inch moveto
((c)) show
grestore
gsave
2.7 inch -2.7 inch translate
0 inch 0 inch moveto
/Times-Bold findfont
12 scalefont setfont
(Figure 4.3) show
/Times-Roman findfont
12 scalefont setfont
( (top) 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
grestore
grestore
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