pgfgas.sty

%%
%% Copyright 2011, Robert Schwarz <schwarz@zib.de>
%%
%% PGF Gas
%%
%% This program is free software: you can redistribute it and/or modify
%% it under the terms of the GNU General Public License as published by
%% the Free Software Foundation, either version 3 of the License, or
%% (at your option) any later version.
%%
%% This program is distributed in the hope that it will be useful,
%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
%% GNU General Public License for more details.
%%
%% You should have received a copy of the GNU General Public License
%% along with this program. If not, see <http:%%www.gnu.org/licenses/>.
%%
\ProvidesPackage{pgfgas}

%%% compressor %%%
\pgfdeclareshape{compressor}{
  \inheritsavedanchors[from=rectangle]
  \inheritanchorborder[from=rectangle]
  \inheritanchor[from=rectangle]{center}
  \inheritanchor[from=rectangle]{north}
  \inheritanchor[from=rectangle]{south}
  \inheritanchor[from=rectangle]{west}
  \inheritanchor[from=rectangle]{east}
  \backgroundpath{
    % store lower right in xa/ya and upper right in xb/yb
   \southwest \pgf@xa=\pgf@x \pgf@ya=\pgf@y
   \northeast \pgf@xb=\pgf@x \pgf@yb=\pgf@y

   \pgfpathmoveto{\pgfpoint{0.5*\pgf@xa}{0.866*\pgf@yb}}
   \pgfpathlineto{\pgfpoint{\pgf@xb}{0}}

   \pgfpathmoveto{\pgfpoint{0.5*\pgf@xa}{0.866*\pgf@ya}}
   \pgfpathlineto{\pgfpoint{\pgf@xb}{0}}

   \pgfpathcircle{\pgfpoint{0}{0}}{\pgf@yb}
  }
}
\tikzset{circuit declare symbol = cs}
\tikzset{set cs graphic = cs graphic}
\tikzset{cs graphic/.style= {
    transform shape,
    draw,
    thick,
    shape=compressor,
    circuit symbol size=width 3 height 3,
  }
}

%%% resistor %%%
\pgfdeclareshape{resistor}{
  \inheritsavedanchors[from=rectangle]
  \inheritanchorborder[from=rectangle]
  \inheritanchor[from=rectangle]{center}
  \inheritanchor[from=rectangle]{north}
  \inheritanchor[from=rectangle]{south}
  \inheritanchor[from=rectangle]{west}
  \inheritanchor[from=rectangle]{east}
  \backgroundpath{
    % store lower right in xa/ya and upper right in xb/yb
    \southwest \pgf@xa=\pgf@x \pgf@ya=\pgf@y
    \northeast \pgf@xb=\pgf@x \pgf@yb=\pgf@y

    \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@ya}}
    \pgfpathlineto{\pgfpoint{\pgf@xa}{\pgf@yb}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{\pgf@yb}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{\pgf@ya}}
    \pgfpathlineto{\pgfpoint{\pgf@xa}{\pgf@ya}}
    \pgfpathclose
  }
}
\tikzset{circuit declare symbol = re}
\tikzset{set re graphic = re graphic}
\tikzset{re graphic/.style = {
    transform shape,
    draw,
    thick,
    shape=resistor,
    circuit symbol size=width 4 height 2
  }
}

%%% valve %%%
\pgfdeclareshape{valve}{
  \inheritsavedanchors[from=rectangle]
  \inheritanchorborder[from=rectangle]
  \inheritanchor[from=rectangle]{center}
  \inheritanchor[from=rectangle]{north}
  \inheritanchor[from=rectangle]{south}
  \inheritanchor[from=rectangle]{west}
  \inheritanchor[from=rectangle]{east}
  \backgroundpath{
    % store lower right in xa/ya and upper right in xb/yb
    \southwest \pgf@xa=\pgf@x \pgf@ya=\pgf@y
    \northeast \pgf@xb=\pgf@x \pgf@yb=\pgf@y

    \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@ya}}
    \pgfpathlineto{\pgfpoint{\pgf@xa}{\pgf@yb}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{\pgf@ya}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{\pgf@yb}}
    \pgfpathlineto{\pgfpoint{\pgf@xa}{\pgf@ya}}
    \pgfpathclose
  }
}
\tikzset{circuit declare symbol = va}
\tikzset{set va graphic = va graphic}
\tikzset{va graphic/.style= {
    transform shape,
    draw,
    thick,
    circuit symbol size=width 3.5 height 2.5,
    shape=valve
  }
}

%%% controlvalve %%%
\pgfdeclareshape{controlvalve}{
  \inheritsavedanchors[from=rectangle]
  \inheritanchorborder[from=rectangle]
  \inheritanchor[from=rectangle]{center}
  \inheritanchor[from=rectangle]{north}
  \inheritanchor[from=rectangle]{south}
  \inheritanchor[from=rectangle]{west}
  \inheritanchor[from=rectangle]{east}
  \backgroundpath{
    % store lower right in xa/ya and upper right in xb/yb
    \southwest \pgf@xa=\pgf@x \pgf@ya=\pgf@y
    \northeast \pgf@xb=\pgf@x \pgf@yb=\pgf@y

    \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@ya}}
    \pgfpathlineto{\pgfpoint{\pgf@xa}{\pgf@yb}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{\pgf@yb}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{\pgf@ya}}
    \pgfpathlineto{\pgfpoint{\pgf@xa}{\pgf@ya}}
    \pgfpathclose

    \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@ya}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{0}}

    \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@yb}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{0}}
  }
}
\tikzset{circuit declare symbol = cv}
\tikzset{set cv graphic = cv graphic}
\tikzset{cv graphic/.style= {
    transform shape,
    draw,
    thick,
    circuit symbol size=width 4 height 2,
    shape=controlvalve
  }
}

%%% pipe %%%
\pgfdeclareshape{pipe}{
  \inheritsavedanchors[from=rectangle]
  \inheritanchorborder[from=rectangle]
  \inheritanchor[from=rectangle]{center}
  \inheritanchor[from=rectangle]{north}
  \inheritanchor[from=rectangle]{south}
  \inheritanchor[from=rectangle]{west}
  \inheritanchor[from=rectangle]{east}
  \backgroundpath{
    % store lower right in xa/ya and upper right in xb/yb
    \southwest \pgf@xa=\pgf@x \pgf@ya=\pgf@y
    \northeast \pgf@xb=\pgf@x \pgf@yb=\pgf@y

    \pgfpathmoveto{\pgfpoint{\pgf@xb}{0}}
    \pgfpathlineto{\pgfpoint{\pgf@xa}{\pgf@ya}}
    \pgfpathlineto{\pgfpoint{\pgf@xa}{\pgf@yb}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{0}}
    \pgfpathclose
  }
}
\tikzset{circuit declare symbol = pi}
\tikzset{set pi graphic = pi graphic}
\tikzset{pi graphic/.style= {
    transform shape,
    draw,
    circuit symbol size=width .5 height .5,
    fill,
    shape=pipe
  }
}