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+\ProvidesPackageRCS[v\pgfversion] $Header: /cvsroot/pgf/pgf/generic/pgf/libraries/pgflibrarytikzbackgrounds.code.tex,v 1.1 2005/08/13 18:59:56 tantau Exp $
+
+% Copyright 2005 by Till Tantau <tantau@cs.tu-berlin.de>.
+%
+% This program can be redistributed and/or modified under the terms
+% of the GNU Public License, version 2.
+
+
+% Layers
+
+\pgfdeclarelayer{background}
+\pgfsetlayers{background,main}
+
+
+% Main style
+
+\tikzstyle{background rectangle}= [draw]
+\tikzstyle{background top}= [draw]
+\tikzstyle{background bottom}= [draw]
+\tikzstyle{background left}= [draw]
+\tikzstyle{background right}= [draw]
+\tikzstyle{background grid}= [help lines,draw]
+
+\define@key{tikz}{inner frame sep}{\def\tikz@framexsep{#1}\def\tikz@frameysep{#1}}
+\define@key{tikz}{inner frame xsep}{\def\tikz@framexsep{#1}}
+\define@key{tikz}{inerr frame ysep}{\def\tikz@frameysep{#1}}
+\def\tikz@framexsep{1ex}
+\def\tikz@frameysep{1ex}
+
+\define@key{tikz}{outer frame sep}{\def\tikz@outerframexsep{#1}\def\tikz@outerframeysep{#1}}
+\define@key{tikz}{outer frame xsep}{\def\tikz@outerframexsep{#1}}
+\define@key{tikz}{outer frame ysep}{\def\tikz@outerframeysep{#1}}
+\def\tikz@outerframexsep{0ex}
+\def\tikz@outerframeysep{0ex}
+
+
+% Looseness
+
+\tikzstyle{loose background}= [inner frame sep=2ex]
+\tikzstyle{tight background}= [inner frame sep=0ex]
+
+
+
+% Showing background styles
+
+\tikzstyle{framed}= [style=show background rectangle]
+\tikzstyle{gridded}= [style=show background grid]
+
+\tikzstyle{show background rectangle}=[execute at end picture=\tikz@background@framed]
+\tikzstyle{show background top}= [execute at end picture=\tikz@background@top]
+\tikzstyle{show background bottom}= [execute at end picture=\tikz@background@bottom]
+\tikzstyle{show background left}= [execute at end picture=\tikz@background@left]
+\tikzstyle{show background right}= [execute at end picture=\tikz@background@right]
+\tikzstyle{show background grid}= [execute at end picture=\tikz@background@grid]
+
+
+% Implementation
+
+\def\tikz@background@save{%
+ \ifx\tikz@bg@minx\@undefined%
+ \pgf@xb=\pgf@picminx%
+ \pgf@yb=\pgf@picminy%
+ \pgf@xc=\pgf@picmaxx%
+ \pgf@yc=\pgf@picmaxy%
+ \setlength{\pgf@x}{\tikz@framexsep}%
+ \setlength{\pgf@y}{\tikz@frameysep}%
+ \advance\pgf@xb by-\pgf@x%
+ \advance\pgf@yb by-\pgf@y%
+ \advance\pgf@xc by\pgf@x%
+ \advance\pgf@yc by\pgf@y%
+ \edef\tikz@bg@minx{\the\pgf@xb}%
+ \edef\tikz@bg@miny{\the\pgf@yb}%
+ \edef\tikz@bg@maxx{\the\pgf@xc}%
+ \edef\tikz@bg@maxy{\the\pgf@yc}%
+ \setlength{\pgf@x}{\tikz@outerframexsep}%
+ \setlength{\pgf@y}{\tikz@outerframeysep}%
+ \advance\pgf@xb by-\pgf@x%
+ \advance\pgf@yb by-\pgf@y%
+ \advance\pgf@xc by\pgf@x%
+ \advance\pgf@yc by\pgf@y%
+ \edef\tikz@bg@outerminx{\the\pgf@xb}%
+ \edef\tikz@bg@outerminy{\the\pgf@yb}%
+ \edef\tikz@bg@outermaxx{\the\pgf@xc}%
+ \edef\tikz@bg@outermaxy{\the\pgf@yc}%
+ \fi%
+}
+
+\def\tikz@background@framed{%
+ \tikz@background@save%
+ \pgfonlayer{background}
+ \path[style=background rectangle] (\tikz@bg@minx,\tikz@bg@miny) rectangle (\tikz@bg@maxx,\tikz@bg@maxy);
+ \endpgfonlayer
+}
+
+\def\tikz@background@top{%
+ \tikz@background@save%
+ \pgfonlayer{background}
+ \path[style=background top] (\tikz@bg@outerminx,\tikz@bg@maxy) -- (\tikz@bg@outermaxx,\tikz@bg@maxy);
+ \endpgfonlayer
+}
+
+\def\tikz@background@bottom{%
+ \tikz@background@save%
+ \pgfonlayer{background}
+ \path[style=background bottom] (\tikz@bg@outerminx,\tikz@bg@miny) -- (\tikz@bg@outermaxx,\tikz@bg@miny);
+ \endpgfonlayer
+}
+
+\def\tikz@background@left{%
+ \tikz@background@save%
+ \pgfonlayer{background}
+ \path[style=background left] (\tikz@bg@minx,\tikz@bg@outerminy) -- (\tikz@bg@minx,\tikz@bg@outermaxy);
+ \endpgfonlayer
+}
+
+\def\tikz@background@right{%
+ \tikz@background@save%
+ \pgfonlayer{background}
+ \path[style=background right] (\tikz@bg@maxx,\tikz@bg@outerminy) -- (\tikz@bg@maxx,\tikz@bg@outermaxy);
+ \endpgfonlayer
+}
+
+\def\tikz@background@grid{%
+ \tikz@background@save%
+ \pgfonlayer{background}
+ \path[style=background grid] (\tikz@bg@minx,\tikz@bg@miny) grid (\tikz@bg@maxx,\tikz@bg@maxy);
+ \endpgfonlayer
+}
+
+
+\endinput