/usr/share/texmf-texlive/metapost/blockdraw_mp/blockdraw.mp is in texlive-metapost 2009-15.
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%% Copyright 2006 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
numeric longblockrx;
numeric longblockry;
numeric smallblockr;
longblockrx := 0.7cm;
longblockry := 0.4cm;
smallblockr := 0.3cm;
numeric connectionlw;
numeric blocklw;
connectionlw := 0.8pt;
blocklw = connectionlw;
numeric textscale;
textscale := 1;
boolean implicitdraw;
implicitdraw := true;
input shiftoff;
def sizedblock(expr txt, z, rx, ry ) =
begingroup
save tmppic;
picture tmppic;
tmppic := nullpicture;
addto tmppic also shiftoff( txt scaled textscale, to_center );
addto tmppic doublepath (-rx,-ry)--(-rx,ry)--(rx,ry)--(rx,-ry)--cycle withpen pencircle scaled blocklw;
tmppic := tmppic shifted z;
if implicitdraw:
draw tmppic;
fi
tmppic
endgroup
enddef;
def longblock(expr txt, z ) =
sizedblock( txt, z, longblockrx, longblockry )
enddef;
def squareblock(expr txt, z ) =
sizedblock( txt, z, smallblockr, smallblockr )
enddef;
def roundblock(expr txt, z ) =
begingroup
save tmppic;
picture tmppic;
tmppic := nullpicture;
addto tmppic also shiftoff( txt scaled textscale, to_center );
addto tmppic doublepath (smallblockr,0)...(0,smallblockr)...(-smallblockr,0)...(0,-smallblockr)...cycle withpen pencircle scaled blocklw;
tmppic := tmppic shifted z;
if implicitdraw:
draw tmppic;
fi
tmppic
endgroup
enddef;
def splitdot(expr z ) =
begingroup
save tmppic;
picture tmppic;
tmppic := nullpicture;
addto tmppic contour fullcircle scaled 2.5connectionlw shifted z;
if implicitdraw:
draw tmppic;
fi
tmppic
endgroup
enddef;
def termcircle(expr z ) =
begingroup
save tmppic;
picture tmppic;
tmppic := nullpicture;
addto tmppic doublepath fullcircle scaled 7connectionlw shifted z;
if implicitdraw:
draw tmppic;
fi
tmppic
endgroup
enddef;
def pointpicture(expr z ) =
begingroup
save tmppic;
picture tmppic;
tmppic := nullpicture;
addto tmppic contour fullcircle scaled 0 shifted z;
tmppic
endgroup
enddef;
def mspoint( expr pth, mediation, slide ) =
(point (arctime mediation * arclength(pth) + slide of pth) of pth)
enddef;
def hhconnect(expr pa, pb, mediation, slide ) =
begingroup
save mid, respath;
numeric mid;
path respath;
mid := (mediation)[ xpart pa, xpart pb ] + (if (xpart pb) > (xpart pa): 1 else: -1 fi) * slide;
respath := pa--( mid, ypart pa )--( mid, ypart pb )--pb;
if implicitdraw:
drawarrow respath withpen pencircle scaled connectionlw;
fi
respath
endgroup
enddef;
def vvconnect(expr pa, pb, mediation, slide ) =
begingroup
save mid, respath;
numeric mid;
path respath;
mid := (mediation)[ ypart pa, ypart pb ] + (if (ypart pb) > (ypart pa): 1 else: -1 fi) * slide;
respath := pa--( xpart pa, mid )--( xpart pb, mid )--pb;
if implicitdraw:
drawarrow respath withpen pencircle scaled connectionlw;
fi
respath
endgroup
enddef;
def hvconnect(expr pa, pb ) =
begingroup
save respath;
path respath;
respath := pa--( xpart pb, ypart pa )--pb;
if implicitdraw:
drawarrow respath withpen pencircle scaled connectionlw;
fi
respath
endgroup
enddef;
def vhconnect(expr pa, pb ) =
begingroup
save respath;
path respath;
respath := pa--( xpart pa, ypart pb )--pb;
if implicitdraw:
drawarrow respath withpen pencircle scaled connectionlw;
fi
respath
endgroup
enddef;
def conlabel(expr shiftdir, txt, z ) =
begingroup
save tmppic;
picture tmppic;
tmppic := shiftoffwlm( txt scaled textscale, shiftdir ) shifted z;
if implicitdraw:
draw tmppic;
fi
tmppic
endgroup
enddef;
def leftpoint(expr pic, n, i ) =
(i/(n+1))[llcorner pic,ulcorner pic]
enddef;
def rightpoint(expr pic, n, i ) =
(i/(n+1))[lrcorner pic,urcorner pic]
enddef;
def bottompoint(expr pic, n, i ) =
(i/(n+1))[llcorner pic,lrcorner pic]
enddef;
def toppoint(expr pic, n, i ) =
(i/(n+1))[ulcorner pic,urcorner pic]
enddef;
def llconnect(expr pica, picb, slide ) =
begingroup
hhconnect( leftpoint( pica, 1, 1 ), leftpoint( picb, 1, 1 ), 0.5, slide )
endgroup
enddef;
def rrconnect(expr pica, picb, slide ) =
begingroup
hhconnect( rightpoint( pica, 1, 1 ), rightpoint( picb, 1, 1 ), 0.5, slide )
endgroup
enddef;
def ttconnect(expr pica, picb, slide ) =
begingroup
vvconnect( toppoint( pica, 1, 1 ), toppoint( picb, 1, 1 ), 0.5, slide )
endgroup
enddef;
def bbconnect(expr pica, picb, slide ) =
begingroup
vvconnect( bottompoint( pica, 1, 1 ), bottompoint( picb, 1, 1 ), 0.5, slide )
endgroup
enddef;
def lrconnect(expr pica, picb ) =
begingroup
hhconnect( leftpoint( pica, 1, 1 ), rightpoint( picb, 1, 1 ), 0.5, 0 )
endgroup
enddef;
def rlconnect(expr pica, picb ) =
begingroup
hhconnect( rightpoint( pica, 1, 1 ), leftpoint( picb, 1, 1 ), 0.5, 0 )
endgroup
enddef;
def btconnect(expr pica, picb ) =
begingroup
vvconnect( bottompoint( pica, 1, 1 ), toppoint( picb, 1, 1 ), 0.5, 0 )
endgroup
enddef;
def tbconnect(expr pica, picb ) =
begingroup
vvconnect( toppoint( pica, 1, 1 ), bottompoint( picb, 1, 1 ), 0.5, 0 )
endgroup
enddef;
def ltconnect(expr pica, picb ) =
begingroup
hvconnect( leftpoint( pica, 1, 1 ), toppoint( picb, 1, 1 ) )
endgroup
enddef;
def lbconnect(expr pica, picb ) =
begingroup
hvconnect( leftpoint( pica, 1, 1 ), bottompoint( picb, 1, 1 ) )
endgroup
enddef;
def rtconnect(expr pica, picb ) =
begingroup
hvconnect( rightpoint( pica, 1, 1 ), toppoint( picb, 1, 1 ) )
endgroup
enddef;
def rbconnect(expr pica, picb ) =
begingroup
hvconnect( rightpoint( pica, 1, 1 ), bottompoint( picb, 1, 1 ) )
endgroup
enddef;
def tlconnect(expr pica, picb ) =
begingroup
vhconnect( toppoint( pica, 1, 1 ), leftpoint( picb, 1, 1 ) )
endgroup
enddef;
def trconnect(expr pica, picb ) =
begingroup
vhconnect( toppoint( pica, 1, 1 ), rightpoint( picb, 1, 1 ) )
endgroup
enddef;
def blconnect(expr pica, picb ) =
begingroup
vhconnect( bottompoint( pica, 1, 1 ), leftpoint( picb, 1, 1 ) )
endgroup
enddef;
def brconnect(expr pica, picb ) =
begingroup
vhconnect( bottompoint( pica, 1, 1 ), rightpoint( picb, 1, 1 ) )
endgroup
enddef;
def connect(expr pica, picb ) =
begingroup
save rxa, rya, rxb, ryb;
numeric rxa;
numeric rya;
numeric rxb;
numeric ryb;
save ca, cb;
pair ca;
pair cb;
rxa = 0.5 * ((xpart lrcorner pica) - (xpart llcorner pica));
rya = 0.5 * ((ypart ulcorner pica) - (ypart llcorner pica));
rxb = 0.5 * ((xpart lrcorner picb) - (xpart llcorner picb));
ryb = 0.5 * ((ypart ulcorner picb) - (ypart llcorner picb));
ca = center pica;
cb = center picb;
if (xpart ca) < (xpart cb) - ( rxa + rxb ):
if (ypart ca) < (ypart cb) - ( rya + ryb ):
rbconnect( pica, picb )
elseif (ypart ca) > (ypart cb) + ( rya + ryb ):
rtconnect( pica, picb )
else:
rlconnect( pica, picb )
fi
elseif (xpart ca) > (xpart cb) + ( rxa + rxb ):
if (ypart ca) < (ypart cb) - ( rya + ryb ):
lbconnect( pica, picb )
elseif (ypart ca) > (ypart cb) + ( rya + ryb ):
ltconnect( pica, picb )
else:
lrconnect( pica, picb )
fi
else:
if (ypart ca) < (ypart cb) - ( rya + ryb ):
tbconnect( pica, picb )
elseif (ypart ca) > (ypart cb) + ( rya + ryb ):
btconnect( pica, picb )
else:
hvconnect( center pica, center picb )
fi
fi
endgroup
enddef;
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