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%!PS-Adobe-3.0
%
% ********************************************************************************
%
% Figure "randparh" from the Moire Demonstration Kit accompanying the book: 
%		"The Theory of the Moire Phenomenon"
% by I. Amidror, published by Kluwer Academic Publishers, 2000.
%
%		* * *  Copyright (c) 2000 EPFL  * * *
%
% Author: I. Amidror
%
% Modified: May 24, 2002
%
% ********************************************************************************
%
% A randomized horizontal parabolic dot-screen
%
% The adjustable parameters are as follows:
% 
% theta1 - the angle of the screen in degrees.
% p1 - the period of the screen in its main direction, in centiinches.
% p1y - the period of the screen in its secondary direction, in centiinches.
% len - the length of the screen, in centiinches.
% wid - the width of the screen, in centiinches.
% diam - the dot diameter, in centiinches.
%
% ********************************************************************************
%





% ************ Adjustable parameters for the grid:


/theta1 0 def		% angle of the screen in degrees

/p1 3 def		% period of the screen in its main direction in centiinches

/p1y 3 def		% period of the screen in its secondary direction in centiinches

/len 700 def		% length of the screen in centiinches

/wid 700 def		% width of the screen in centiinches

/diam 1.5 def		% the dot diameter in centiinches




% ************ Draw the dot-screen:

/inch {72 mul} def

/centiinch {0.72 mul} def

/myrand {rand 2147483647 div 2 mul 1 sub} def	% random number between -1...1

7 srand		% seed for rand

/rr 1 def	% random numbers will be generated in the range -rr...rr
		% (in PostScript points!)

0.2 inch 3.0 inch translate


/len2 len 2 div def
/wid2 wid 2 div def
diam centiinch setlinewidth

1 setlinecap


/a 0.001 def	% coefficient of x**2 for the parabolas

/x len2 neg def
/xx x x mul a mul def


gsave
4 inch 4.0 inch translate
theta1 rotate
0 p1y len		% draw rows of dots
{newpath
	/ysave exch centiinch wid2 centiinch sub def
	0 p1 len		% draw a row of dots
	{centiinch len2 xx sub centiinch sub 
	myrand rr mul sub ysave myrand rr mul sub moveto
	0 0 rlineto} for
	stroke
	/x x p1y add def
	/xx x x mul a mul def
} for
grestore



gsave
1.75 inch -1.0 inch translate
0.5 inch 0 inch moveto
/Times-Roman findfont
12 scalefont setfont
(Figure  ) show
/Times-Bold findfont
12 scalefont setfont
(randparh) show
/Times-Roman findfont
12 scalefont setfont
(  from the Moire) show
-0.06 inch 0 inch rmoveto
(\302 Demonstration Kit) show
0.1 inch -0.25 inch moveto
(accompanying 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
0.1 inch -0.5 inch moveto
(by I. Amidror, published by Kluwer Academic Publishers, 2000.) show
grestore




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