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%!PS-Adobe-3.0 % % ******************************************************************************** % % Figure 7.5(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 3 line gratings - first layer only: % % The grating parameters are as follows: % % 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 0.9 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 2.05 inch 1.13 inch translate gsave % ******************************** Fig. (a): /theta1 0 def % angle of grating A /theta2 120 def % angle of grating B /theta3 244.5 def % angle of grating C /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 A: gsave 2 inch 6.2 inch 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 -0.95 inch -0.62 inch moveto (A) show grestore % Draw white cross: gsave 2 inch 6.2 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 2 inch 6.2 inch translate -0.08 inch -1.28 inch moveto /Times-Roman findfont 12 scalefont setfont ((a)) show grestore gsave -0.25 inch 1.2 inch translate 0 inch 0 inch moveto /Times-Bold findfont 12 scalefont setfont (Figure 7.5(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 showpage