[XeTeX] Problems with xcolor and fontspec

[Stephen Moye]

The following minimum example shows the problem: I would like to generate some text in random colors and specify the opacity. In the example file below, either I get black text with opacity of 50%, or random colors at 100% opacity, or one random color for all the text at 50% opacity. Can I have my cake and eat it too? That is, can I have random colors *and* control over the opacity?

I'm using MacTeX 2011.

Thanks for any insights.

Stephen Moye

%%=====8><-----%%

% !TEX TS-program = XeLaTeX-xdv2pdf

\documentclass{article}

\input random
\usepackage{xcolor}
\usepackage{fontspec}

\setmainfont{Helvetica}

\newlength{\huedim}

\newcommand{\randcolor}{%
	\setrandim\huedim{0.0pt}{1.0pt}%
	\definecolor{mycolor}{hsb}{\pointless\huedim,1.0,1.0}%
	\color{mycolor}
}

\newcommand{\testit}[3]{%
	%%% Uncomment *one* of the following \put commands to see the difference:
	%
	%%% This returns only gray:
	%\put(#1,#2){\randcolor\addfontfeature{Opacity=0.5}\color{mycolor}#3}
	%
	%%% This returns only the color first defined:
	%\put(#1,#2){\randcolor\addfontfeature{Color=mycolor,Opacity=0.5}\color{mycolor}#3}
	%
	%%% This works as it should, but the opacity is 100%
	%\put(#1,#2){\randcolor\color{mycolor}#3}
}

\begin{document}

\begin{picture}(100,100)
\testit{20}{100}{X}
\testit{30}{90}{y}
\testit{40}{80}{z}
\end{picture}

\end{document}