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%!PS-Adobe-3.0
%
% ********************************************************************************
%
% Figure "ellipse" 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
%
% ********************************************************************************
%
% An elliptic curvilinear grating
%
% The adjustable parameters are as follows:
% 
% theta1 - the angle of the first axis of the elliptic grating, in degrees.
% p1 - the radial period of the elliptic grating along its first axis, in
%	centiinches.
% rad - the radius of the elliptic grating along its first axis, in centiinches.
% ratio - the ratio between the radiuses along the first and the second axes.
% lwidth - the linewidth, in centiinches.
%
% ********************************************************************************
%





% ************ Adjustable parameters for the curvilinear grating:


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

/p1 3 def		% radial period of the elliptic grating along its first axis 
			% in centiinches
/rad 330 def		% radius of the elliptic grating along its first axis 
			% in centiinches
/ratio 1.3 def		% the ratio between the radiuses along the first and the 
			% second axes
/lwidth 1.0 def		% linewidth in centiinches





% ************ Draw the circular grating:

/inch {72 mul} def

/centiinch {0.72 mul} def

0.15 inch 3.0 inch translate


lwidth centiinch setlinewidth


gsave
4 inch 4 inch translate
theta1 rotate
1 ratio scale

/firstrad p1 2.0 div def
newpath
firstrad p1 rad		% draw circles
{/r exch def
 0 0 r centiinch 0 360 arc stroke
} 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
(ellipse) 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, 1999.) show
grestore




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