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%!PS-Adobe-3.0
%
% ********************************************************************************
%
% Figure "grid2" from the Moire Demonstration Kit accompanying 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 14, 1999
%
% ********************************************************************************
%
% A periodic line grid with a slightly larger period
%
% The adjustable parameters are as follows:
% 
% theta1 - the angle of the first grating in degrees.
% theta2 - the angle of the second grating in degrees.
% p1 - the period of the first grating, in centiinches.
% p2 - the period of the second grating, in centiinches.
% len - the length of the two gratings, in centiinches.
% wid - the width of the two grating (= their lines length), in centiinches.
% lwidth - the linewidth, in centiinches.
%
% ********************************************************************************
%





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


/theta1 0 def		% angle of the first grating in degrees

/theta2 33 def		% angle of the second grating in degrees

/p1 3.1 def		% period of the first grating in centiinches

/p2 3.1 def		% period of the second grating in centiinches

/len 699 def		% length of the two gratings in centiinches

/wid 699 def		% width of the two gratings (= lines length) in centiinches

/lwidth 1.0 def		% linewidth in centiinches




% ************ Draw the grid:

/len2 len 2 div def
/wid2 wid 2 div def
lwidth  setlinewidth


gsave
0 0 translate
theta1 rotate
newpath
0 p1 len		% draw lines of first grating
{len2 sub wid2 neg moveto
0 wid rlineto} for
stroke
grestore


gsave
0 0 translate
theta2 rotate
newpath
0 p2 len		% draw lines of second grating
{len2 sub wid2 neg moveto
0 wid rlineto} for
stroke
grestore


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