%!PS-Adobe-1.0
% hexpaper.ps - Version 1.0 : Hexagon mapping paper in PostScript
%
% Copyright 1994 by Daniel C. Nygren
% Current e-mail: nygren@tecnet1.jcte.jcs.mil
%
% Permission to use and modify this software for any purpose other than
% commercial use or its incorporation into a commercial product is
% hereby granted without fee. Permission to copy and distribute this software
% only for non-commercial use is also granted without fee, provided that
% the above copyright notice and this entire permission notice appear in
% all copies, and any supporting documentation. The author makes no
% representations about the suitability of this software for any purpose.
% It is provided "as is" without express or implied warranty.

% This program prints out hexagon mapping paper on a PostScript printer.
% The size of the hexes is adjustable via the side_size variable. The darkness
% of the lines can be changed with the setgray operator and the line thickness
% can also be set differently with the setlinewidth operator.

% --- Defines ---

/#copies 1 def	%Enter number of copies to print out

/side_size {0.2} def	%Enter length of a hexagon side in inches

/paper_width {8.5} def	%Enter paper width in inches
/paper_height {11} def	%Enter paper height in inches
/margin {0.25} def	%Enter paper margin in inches

% Calculate a hexagon's height and width given a side's size
/hex_height {2 side_size mul 60 sin mul} bind def
/hex_width {2 side_size mul 60 cos mul side_size add} bind def

% Calculate how many hexes will fit across the paper's width
% Subtract a hex_width from the available space because we need to
% add one last_hex_bottom at the end of each row of hex_bottoms
/this_many_hexes_wide {paper_width margin 2 mul sub hex_width sub hex_width side_size add div floor} bind def

% Calculate how many hexes will fit across the paper's height
/this_many_hexes_high {paper_height margin 2 mul sub hex_height div floor} bind def

/inch {72 mul} bind def

% --- Lines ---
/line {side_size inch 0 inch rlineto} def
/no_line {side_size inch 0 inch rmoveto} def

/hex_bottom {		%	 %%%%%%
	-60 rotate	 %	%
	line		  %%%%%%
	60 rotate
	line
	60 rotate
	line
	-60 rotate
	line
} bind def

/last_hex_bottom {	%	 %
	-60 rotate	 %	%
	line		  %%%%%%
	60 rotate
	line
	60 rotate
	line
	-60 rotate
} bind def

/hex_top {		  %%%%%%
	60 rotate	 %	%
	line		%	 %------
	-60 rotate
	line
	-60 rotate
	line
	60 rotate
	no_line
} bind def

% --- Start program ---

newpath	%Start with a clean slate

0.2 setgray		%Play with this to change darkness of lines
0.2 setlinewidth	%Play with this to change line thickness

% --- Calculate where to start printing so the hexes are centered ---

% Find out how many hex_bottoms will fit across the paper's width.
this_many_hexes_wide

% Then see how much room they will take up (Don't forget the last hex bottom!)
hex_width side_size add mul hex_width add

% Then subtract from paper width and divide by two to find out where to start
% printing. This x coordinate is left on the stack.
paper_width exch sub 2 div inch

% Find out how many hexes will fit across the paper's height
this_many_hexes_high

% Then see how much room they will take up
hex_height mul

% Then subtract from paper height and divide by two and add hex_height divided
% by two (because we start drawing at the middle of the hex) to find out where
% to start printing This y coordinate is left on the stack.
paper_height exch sub 2 div hex_height 2 div add inch

% Start printing at the calculated spot
moveto

% Construct the rows of hexes by printing a row of hex bottoms
% followed by a row of hex tops. Loop counts must be integers, so
% cvi is used to convert the numbers to integers.

this_many_hexes_high cvi{

	currentpoint	%Save currentpoint on stack twice:
	currentpoint	%once for getting back to print the hex tops,
			%once for returning to move up one row.

	%Make a row of hex_bottoms
	this_many_hexes_wide cvi{

		hex_bottom

	}repeat

	last_hex_bottom	%Last hex bottom doesn't have a tail sticking out

	moveto	%Go back to point saved on stack to print hex tops

	%Make a row of hex tops
	this_many_hexes_wide cvi{

		hex_top

	}repeat

	hex_top	%Last hex top to match last hex bottom

	moveto	%Go back to point saved on stack so we can move up to next row

	0 inch hex_height inch rmoveto	%Move up to next row

}repeat

stroke

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