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+\documentclass{article}
+\usepackage{axiom}
+\begin{document}
+\title{\$SPAD/src/algebra color.spad}
+\author{Jim Wen}
+\maketitle
+\begin{abstract}
+\end{abstract}
+\eject
+\tableofcontents
+\eject
+\section{domain COLOR Color}
+<<domain COLOR Color>>=
+)abbrev domain COLOR Color
+++ Author: Jim Wen
+++ Date Created: 10 May 1989
+++ Date Last Updated: 19 Mar 1991 by Jon Steinbach
+++ Basic Operations: red, yellow, green, blue, hue, numberOfHues, color, +, *, =
+++ Related Constructors:
+++ Also See:
+++ AMS Classifications:
+++ Keywords: 
+++ References:
+++ Description: Color() specifies a domain of 27 colors provided in the 
+++ \Language{} system (the colors mix additively).
+ 
+
+Color(): Exports == Implementation where
+  I      ==> Integer
+  PI     ==> PositiveInteger
+  SF     ==> DoubleFloat
+ 
+  Exports ==> AbelianSemiGroup with
+    "*"    : (PI, %) -> %
+      ++ s * c, returns the color c, whose weighted shade has been scaled by s.
+    "*"    : (SF, %) -> %
+      ++ s * c, returns the color c, whose weighted shade has been scaled by s.
+    "+"    : (%, %) -> %
+      ++ c1 + c2 additively mixes the two colors c1 and c2.
+    red    : ()      -> %
+      ++ red() returns the position of the red hue from total hues.
+    yellow : ()      -> %
+      ++ yellow() returns the position of the yellow hue from total hues.
+    green  : ()      -> %
+      ++ green() returns the position of the green hue from total hues.
+    blue   : ()      -> %
+      ++ blue() returns the position of the blue hue from total hues.
+    hue    : %       -> I
+      ++ hue(c) returns the hue index of the indicated color c.
+    numberOfHues : ()    -> PI
+      ++ numberOfHues() returns the number of total hues, set in totalHues.
+    color  : Integer -> %
+      ++ color(i) returns a color of the indicated hue i.
+  
+  Implementation ==> add
+    totalHues   ==> 27  --see  (header.h file) for the current number
+
+    Rep := Record(hue:I, weight:SF)
+ 
+
+    f:SF * c:% ==
+      -- s * c returns the color c, whose weighted shade has been scaled by s
+      zero? f => c
+      -- 0 is the identitly function...or maybe an error is better?
+      [c.hue, f * c.weight]
+ 
+    x + y ==
+      x.hue = y.hue => [x.hue, x.weight + y.weight]
+      if y.weight > x.weight then  -- let x be color with bigger weight
+        c := x
+        x := y
+        y := c
+      diff := x.hue - y.hue
+      if (xHueSmaller:= (diff < 0)) then diff := -diff
+      if (moreThanHalf:=(diff > totalHues quo 2)) then diff := totalHues-diff
+      offset : I := wholePart(round (diff::SF/(2::SF)**(x.weight/y.weight)) )
+      if (xHueSmaller and ^moreThanHalf) or (^xHueSmaller and moreThanHalf) then
+        ans := x.hue + offset
+      else
+        ans := x.hue - offset
+      if (ans < 0) then ans := totalHues + ans
+      else if (ans > totalHues) then ans := ans - totalHues
+      [ans,1]
+ 
+    x = y     == (x.hue = y.hue) and (x.weight = y.weight)
+    red()     == [1,1]
+    yellow()  == [11::I,1]
+    green()   == [14::I,1]
+    blue()    == [22::I,1]
+    sample()  == red()
+    hue c     == c.hue
+    i:PositiveInteger * c:% == i::SF * c
+    numberOfHues() == totalHues 
+
+    color i ==
+      if (i<0) or (i>totalHues) then
+       error concat("Color should be in the range 1..",totalHues::String)
+      [i::I, 1]
+ 
+    coerce(c:%):OutputForm ==
+      hconcat ["Hue: "::OutputForm, (c.hue)::OutputForm,
+               "  Weight: "::OutputForm, (c.weight)::OutputForm]
+
+@
+\section{domain PALETTE Palette}
+<<domain PALETTE Palette>>=
+)abbrev domain PALETTE Palette
+++ Author: Jim Wen
+++ Date Created: May 10th 1989
+++ Date Last Updated: Jan 19th 1990
+++ Basic Operations: dark, dim, bright, pastel, light, hue, shade, coerce
+++ Related Constructors:
+++ Also See:
+++ AMS Classifications:
+++ Keywords: dim,bright,pastel,coerce
+++ References:
+++ Description: This domain describes four groups of color shades (palettes).
+ 
+Palette(): Exports == Implementation where
+  I      ==> Integer
+  C      ==> Color
+  SHADE  ==> ["Dark","Dim","Bright","Pastel","Light"]
+
+  Exports ==> SetCategory with
+    dark   : C  -> %
+      ++ dark(c) sets the shade of the indicated hue of c to it's lowest value.
+    dim    : C  -> %
+      ++ dim(c) sets the shade of a hue, c,  above dark, but below bright.
+    bright : C  -> %
+      ++ bright(c) sets the shade of a hue, c, above dim, but below pastel.
+    pastel : C  -> %
+      ++ pastel(c) sets the shade of a hue, c,  above bright, but below light.
+    light  : C  -> %
+      ++ light(c) sets the shade of a hue, c,  to it's highest value.
+    hue    : %  -> C
+      ++ hue(p) returns the hue field of the indicated palette p.
+    shade  : %  -> I
+      ++ shade(p) returns the shade index of the indicated palette p.
+    coerce : C  -> %
+      ++ coerce(c) sets the average shade for the palette to that of the 
+      ++ indicated color c.
+ 
+  Implementation ==> add
+    Rep := Record(shadeField:I, hueField:C)
+
+    dark   c == [1,c]
+    dim    c == [2,c]  
+    bright c == [3,c]  
+    pastel c == [4,c]  
+    light  c == [5,c]  
+    hue    p == p.hueField
+    shade  p == p.shadeField
+    sample() == bright(sample())
+    coerce(c:Color):% == bright c
+    coerce(p:%):OutputForm ==
+      hconcat ["[",coerce(p.hueField),"] from the ",SHADE.(p.shadeField)," palette"]
+
+@
+\section{License}
+<<license>>=
+--Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
+--All rights reserved.
+--
+--Redistribution and use in source and binary forms, with or without
+--modification, are permitted provided that the following conditions are
+--met:
+--
+--    - Redistributions of source code must retain the above copyright
+--      notice, this list of conditions and the following disclaimer.
+--
+--    - Redistributions in binary form must reproduce the above copyright
+--      notice, this list of conditions and the following disclaimer in
+--      the documentation and/or other materials provided with the
+--      distribution.
+--
+--    - Neither the name of The Numerical ALgorithms Group Ltd. nor the
+--      names of its contributors may be used to endorse or promote products
+--      derived from this software without specific prior written permission.
+--
+--THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+--IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+--TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+--PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+--OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+--EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+--PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+--PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+--LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+--NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+--SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+@
+<<*>>=
+<<license>>
+ 
+<<domain COLOR Color>>
+<<domain PALETTE Palette>>
+@
+\eject
+\begin{thebibliography}{99}
+\bibitem{1} nothing
+\end{thebibliography}
+\end{document}