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%% bondgraph.mp
%% Copyright 2007 Henrik Tidefelt
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3
% of this license or (at your option) any later version.
% The latest version of this license is in
% http://www.latex-project.org/lppl.txt
% and version 1.3 or later is part of all distributions of LaTeX
% version 2005/12/01 or later.
%
% This work has the LPPL maintenance status `maintained´.
%
% The Current Maintainer of this work is Henrik Tidefelt,
% tidefelt@isy.liu.se.
%
% This work, referred to as blockdraw.mp, consists of the files
% shiftoff.mp
% blockdraw.mp
% bondgraph.mp
% blockdraw_mp.pdf
%
%
% === Notes regarding the backward incompatible changes of 2007-01-21. ===
%
% As it was discovered that MetaPost uses the verbatimtex construct only in
% the file it appears in, it was concluded that package files cannot contain
% any content that depends on the LaTeX preamble. In other words, any
% btex ... etex constructs must be moved from package files to the application
% sources from where the package files are included.
%
% With the definition of, say, p-junction blocks in the application source,
% it is easy to change notation from the letters "p" and "s" to the numbers
% "0" and "1".
%
% The obvious drawback, beside backward incompatibility, is that this will
% cause a lot of code replication, making bond graph source files
% less concise, and require multiple file search-and-replace actions when
% changing junction notation for a collection of graphs. However, since
% MetaPost only allows literal character strings in the btex ... etex
% construct, these inconveniences seem impossible to work around. Ideas,
% anyone?
input blockdraw;
implicitdraw := false;
boolean junctionimplicitdraw;
junctionimplicitdraw := true;
boolean useopenbonds;
useopenbonds := false;
connectionlw := 0.5pt;
ahlength := 3mm;
bboxmargin := 1.5mm;
def withbbmargin(expr pic ) =
begingroup
save tmppic;
picture tmppic;
tmppic = pic;
setbounds tmppic to bbox pic;
tmppic
endgroup
enddef;
def junction(expr txt, z ) =
begingroup
save tmppic;
picture tmppic;
tmppic := nullpicture;
addto tmppic also shiftoff( txt scaled textscale, to_center );
setbounds tmppic to (-smallblockr,-smallblockr)--(-smallblockr,smallblockr)--(smallblockr,smallblockr)--(smallblockr,-smallblockr)--cycle;
tmppic := tmppic shifted z;
if junctionimplicitdraw:
draw tmppic;
fi
tmppic
endgroup
enddef;
def junctionlbl(expr txt, arrowdir, lbl, z, arrow ) =
begingroup
save tmppic, ahlength, p, d;
ahlength := 1mm;
path p;
numeric d;
picture tmppic;
tmppic := nullpicture;
addto tmppic also shiftoff( txt scaled textscale, to_center );
if arrowdir = to_top:
p := ((lrcorner tmppic)--(urcorner tmppic)) shifted ( z + (connectionlw + 2*ahlength*sind(0.5*ahangle),0) );
d = to_rt;
elseif arrowdir = to_lft:
p := ((urcorner tmppic)--(ulcorner tmppic)) shifted ( z + (0,connectionlw + 2*ahlength*sind(0.5*ahangle)) );
d = to_top;
elseif arrowdir = to_bot:
p := ((urcorner tmppic)--(lrcorner tmppic)) shifted ( z + (connectionlw + 2*ahlength*sind(0.5*ahangle),0) );
d = to_rt;
elseif arrowdir = to_rt:
p := ((ulcorner tmppic)--(urcorner tmppic)) shifted ( z + (0,connectionlw + 2*ahlength*sind(0.5*ahangle)) );
d = to_top;
fi
setbounds tmppic to (-smallblockr,-smallblockr)--(-smallblockr,smallblockr)--(smallblockr,smallblockr)--(smallblockr,-smallblockr)--cycle;
tmppic := tmppic shifted z;
if junctionimplicitdraw:
if arrow:
drawarrow p withpen pencircle scaled connectionlw;
fi
draw conlabel( d, lbl, mspoint( p, 0.5, 0 ) );
draw tmppic;
fi
tmppic
endgroup
enddef;
def terminal(expr d, txt, z ) =
begingroup
save tmppic;
picture tmppic;
tmppic := shiftoff( withbbmargin( txt scaled textscale ), d ) shifted ( z - smallblockr * dir_to( d ) );
if junctionimplicitdraw:
draw tmppic;
fi
tmppic
endgroup
enddef;
def ignorepicture(expr pic ) =
show 0
enddef;
def terminalto(expr j, txt, z ) =
begingroup
ignorepicture( terminal( to_dir( z - (center j) ), txt, z ) );
bgconnect( pointpicture( z ) , j )
endgroup
enddef;
def terminalfr(expr j, txt, z ) =
begingroup
ignorepicture( terminal( to_dir( z - (center j) ), txt, z ) );
bgconnect( j, pointpicture( z ) )
endgroup
enddef;
def bgconnect(expr pica, picb ) =
begingroup
save d;
pair d;
if (center pica) = (center picb):
d := (1,0);
else:
d := unitvector( (center picb) - (center pica) );
fi
((center pica)+d*smallblockr)--((center picb)-d*smallblockr)
endgroup
enddef;
def bond(expr p ) =
begingroup
save t;
numeric t;
t := arctime arclength(p) - ahlength of p;
save z;
pair z;
z = (point t of p) + dir(angle(direction t of p)+90) * ahlength*sind(0.5*ahangle);
save res;
path res;
if useopenbonds:
draw p--z withpen pencircle scaled connectionlw
else:
draw p withpen pencircle scaled connectionlw;
res = (subpath (t,infinity) of p)--z--cycle;
filldraw res withpen pencircle scaled connectionlw
fi
endgroup
enddef;
def causalmark(expr p, where ) =
begingroup
save d;
numeric d;
d = angle( direction where of p );
if where = 0:
d := d + 180;
fi
save z;
pair z;
z = ( point where of p ) + dir(d) * connectionlw;
save res;
path res;
res = (z+dir(d+90)*ahlength*sind(0.5*ahangle))--(z+dir(d-90)*ahlength*sind(0.5*ahangle));
draw res withpen pencircle scaled (2*connectionlw)
endgroup
enddef;
def hbond(expr p ) =
begingroup
bond( p );
causalmark( p, infinity )
endgroup
enddef;
def tbond(expr p ) =
begingroup
bond( p );
causalmark( p, 0 )
endgroup
enddef;
def flowlabel(expr p, txt ) =
% the midpoint has typically singular direction, so we can't do the obvious:
% draw( conlabel( to_dir( dir( angle( direction (0.5*length(p)) of p ) - 90 ) ), txt, mspoint( p, 0.5, 0 ) ) )
draw conlabel( to_dir( dir( angle( (point infinity of p) - (point 0 of p) ) - 90 ) ), txt, mspoint( p, 0.5, 0 ) ) withpen pencircle scaled connectionlw
enddef;
def effortlabel(expr p, txt ) =
% the midpoint has typically singular direction, so we can't do the obvious:
% draw( conlabel( to_dir( dir( angle( direction (0.5*length(p)) of p ) + 90 ) ), txt, mspoint( p, 0.5, 0 ) ) )
draw conlabel( to_dir( dir( angle( (point infinity of p) - (point 0 of p) ) + 90 ) ), txt, mspoint( p, 0.5, 0 ) ) withpen pencircle scaled connectionlw
enddef;
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