%% Save file as: COLORS.STY                     Source: FILESERV@SHSU.BITNET
%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
% Name:
%	colors.sty
% Author:  Fred Knight <knight@ll.mit.edu>
% Purpose:
%	Implement grayscale or color selection from LaTeX for PostScript.
%	Works with black-and-white and color PostScript printers.
%	A rainbow of colors is defined by default; you can add any
%	color if you know its RGB values, e.g., from $OPENWINHOME/lib/rgb.txt.
% NOTE: RGB.TXT is stored as STY.COLORS_RGB_TXT on FILESERV and is in the
%       [.STY] directory on Niord.SHSU.edu (192.92.115.8)
%
% Examples:
%-----1.
%	\documentstyle[colors,...]{...}
%
%	\begin{verse}
%		\psred Roses are red;\\
%		\psblue The sky is blue;\\
%		\psgreen Pickles are green;\\
%		\psorange Colors are new.\\ \psblack
%
%		\red{Strawberries are red too;}\\
%		\violet{But violets are never blue;}\\
%	\end{verse}
%-----2.
%	\documentstyle[colors,...]{...}
%
%	\def\psLightGoldenrod{\pssetrgbcolor{0.93}{0.86}{0.51}}
%	\def\LightGoldenrod#1{\psgsave\psLightGoldenrod#1\psgrestore}
%	\LightGoldenrod{I like Light Goldenrod for a border color.}
%	I like \psLightGoldenrod Light Goldenrod\psblack for a border color.
% Usage:
%	\ps<color>	: changes to <color>,
%			: e.g., \psred red \psblue not blue
%	\<color>{text}	: outputs text in <color>,
%			: e.g., \red{strawberries}
%
%	\pssetgray{f}	: changes color to shade of gray
%			: f = 0 (black) to 1 (white)
% Restrictions:
%	Only for Postscript---black & white or color!
%	Only for dvi-to-ps driver that understands:
%		\special{ps:: <Postscript commands>}
% Modification History:
%	write, 19 Oct 90, FKK
%	alter \psred, \psorange, etc.; make a bw rainbow, 13 Nov 90, FKK
%	omit pscolor and psbw booleans, 26 Jun 91, FKK
%	add macros with arguments (see usage), 26 Jun 91, FKK
%	remove \tan (conflicts with tangent) but keep \pstan, 15 Apr 92, FKK
%-------------------------------------------------------------------
%
%	=====>> BASIC ACCESS TO POSTSCRIPT COLORS
%
%	=====>> Usage: \pssetrgbcolor{red}{green}{blue}
%		where:		0 < red < 1, etc.
%	=====>> Note: B&W ps printers understand setrgbcolor!
%
\def\pssetrgbcolor#1#2#3{\immediate\special{ps:: #1 #2 #3 setrgbcolor}}
\def\pssetgray#1{\immediate\special{ps:: #1 setgray}}
\def\psgsave{\immediate\special{ps:: gsave}}
\def\psgrestore{\immediate\special{ps:: grestore}}
%
%	=====>> COMMANDS DERIVED FROM \pssetrgbcolor AND \pssetgray
%	=====>> TWO TYPES: SET A NEW COLOR (NO ARGUMENT), e.g., \psred
%	=====>>		   COLOR AN ARGUMENT, e.g., \red{Roses are red;}
%
\def\psgray#1{\pssetgray{#1}}
\def\psblack{\psgray{0}}
\def\black#1{\psgsave\psblack#1\psgrestore}
\def\psred{\pssetrgbcolor{1}{0}{0}}
\def\red#1{\psgsave\psred#1\psgrestore}
\def\psorange{\pssetrgbcolor{1}{.65}{0}}
\def\orange#1{\psgsave\psorange#1\psgrestore}
\def\psyellow{\pssetrgbcolor{1}{1}{0}}
\def\yellow#1{\psgsave\psyellow#1\psgrestore}
\def\psgreen{\pssetrgbcolor{0}{1}{0}}
\def\green#1{\psgsave\psgreen#1\psgrestore}
\def\psblue{\pssetrgbcolor{0}{0}{1}}
\def\blue#1{\psgsave\psblue#1\psgrestore}
\def\psviolet{\pssetrgbcolor{.72}{.33}{.83}}
\def\violet#1{\psgsave\psviolet#1\psgrestore}
\def\pstan{\pssetrgbcolor{.5}{.5}{.2}}
%conflicts with tangent%\def\tan#1{\psgsave\pstan#1\psgrestore}
\def\psbrown{\pssetrgbcolor{.5}{.3}{.3}}
\def\brown#1{\psgsave\psbrown#1\psgrestore}
\def\pswhite{\psgray{1}}
\def\white#1{\psgsave\pswhite#1\psgrestore}