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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
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