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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: % % 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 % Draw screen B: gsave 1 inch 2.5 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 -1 inch -1.13 inch moveto (B) 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 grestore grestore showpage