How to color half page?

Question

I used color to color my page. I want a horizontal (halfway) colored patch which begins from the midpoint and ends at the right end of the page. (Only for the first page and not for the complete document.) I've used the following commands from the package.

\usepackage{color} \color{white} \pagecolor{black}

Answer 1

The following example uses eso-pic to tap into the shipout mechanism, printing a rectangular block in BackGround of the current page. The hook is the LowerLeft part of the Page, so we shift over .5\paperwidth and then set a rectangle of appropriate size.

\documentclass{article}

\usepackage{eso-pic,xcolor}
\usepackage{lipsum}

\begin{document}

% To this page only, add a background that fills have the page (from the top)
\AddToShipoutPictureBG*{%
  \AtPageLowerLeft{%
    \hspace*{.5\paperwidth}%
    \color{blue}%
    \rule{.5\paperwidth}{\paperheight}%
  }%
}%

\lipsum[1-10]

\end{document}