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%% tgbx0027.mp
%% Copyright 2006 Tommy Ekola <tek@kth.se>
%
% 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
%
% This work has the LPPL maintenance status `maintained'. The Current
% Maintainer of this work is Tommy Ekola. The Base Interpreter is
% MetaPost.
vardef setup_paren (expr source_file, cmdname) =
scantokens ("input tgbx0000");
scantokens ("input " & source_file);
expandafter def scantokens cmdname expr p =
scantokens (cmdname & "__tgbxww")(p)
enddef;
expandafter vardef scantokens (cmdname & "__tgbxww " & "(expr apth) " &
"text text_ = " &
"save u, designsize, curve, stem, rule_thickness, eps, fine, " &
" fudge, hair;" &
"u# := " & decimal u# & ";" &
"designsize := " & decimal designsize & ";" &
"curve# := " & decimal curve# & ";" &
"stem# := " & decimal stem# & ";" &
"rule_thickness# := " & decimal rule_thickness# & ";" &
"eps := " & decimal eps & ";" &
"fine# := " & decimal fine# & ";" &
"fudge := " & decimal fudge & ";" &
"hair# := " & decimal hair# & ";" &
% Time for middle piece
"save st; numeric st;" &
"if unknown " & cmdname & "_middle_time:" &
" st := arctime (arclength apth)/2 of apth;" &
"else: st:=" & cmdname & "_middle_time; fi")
save prevpen;
prevpen:=savepen;
save w; numeric w; w :=12u#;
save h; numeric h; h :=0;
save dh; numeric dh; dh:=0.6designsize;
save dw; numeric dw; dw:=curve#-stem#;
save d; numeric d; d :=1.5dh;
save bold; numeric bold; bold := curve#;
save min_breadth; numeric min_breadth;
min_breadth:=rule_thickness#+0.6dw;
save max_breadth; numeric max_breadth;
max_breadth:=bold+2dw;
save heavy_rule_thickness; numeric heavy_rule_thickness#;
heavy_rule_thickness#:=3rule_thickness#;
save x,y;
numeric x[],x[]',x[]l,x[]'l,x[]r,x[]'r,
y[],y[]',y[]l,y[]'l,y[]r,y[]'r;
if fine#>fudge*hair#:
fine# := fudge*hair#;
fi
pickup if fine#=0: nullpen else: pencircle scaled fine# fi;
penpos3(min_breadth,0); penpos4(max_breadth,0);
rt x3r = w-1.25u#+0.5min_breadth; lft x4l = 1.25u#;
bot y3=-d; y4=h;
penpos1(min_breadth,0); penpos2(max_breadth,0);
rt x1r = w-1.25u#+0.5min_breadth; lft x2l = 1.25u#;
top y1 = h; y2=-d;
save mapto, n;
vardef mapto(text t) =
hide(numeric n; n:=0;
numeric x,x_[],y,y_[];
for z=t: z_[incr n]:=z; endfor;
transform T;
z_2 = z_1 transformed T;
z_4 = z_3 transformed T;
z_6 = z_5 transformed T;)
T
enddef;
% The bottom part of the parenthesis
save bottom_part;
vardef bottom_part(expr T) =
filldraw (z3l{3(x4l-x3l),y4-y3}..{up}z4l
--reverse(z3r{3(x4r-x3r),y4-y3}..{up}z4r)
--cycle) transformed T text_;
enddef;
save f;
vardef f(expr s) =
abs(point 0 of apth - (point s of apth +
(w-2.5u#+0.5min_breadth+0.5*max_breadth)
*(unitvector (direction s of apth) rotated 90)))
< ((h+d) ++ (w-2.5u#+0.5min_breadth+0.5*max_breadth))
enddef;
save tolerence; tolerence:=epsilon;
save s; numeric s;
save T; transform T; % transform the bottom part
if arclength apth=0:
T := identity shifted (point (length apth) of apth - z3r);
elseif arclength apth < y1-y2+y4-y3:
T := mapto(z4l,
0.5[point 0 of apth, point (length apth) of apth]
+ abs(x3r-x4l)*(unitvector (point (length apth) of apth -
point 0 of apth) rotated 90),
z4r,
0.5[point 0 of apth, point (length apth) of apth]
+ abs(x3r-x4r)*(unitvector (point (length apth) of apth -
point 0 of apth) rotated 90),
z3r,
point 0 of apth);
else:
s := solve f(0,length apth);
T := mapto(z4l,
point s of apth + (w-2.5u#+0.5min_breadth+0.5max_breadth)
*(unitvector (direction s of apth) rotated 90),
z4r,
point s of apth + (w-2.5u#+0.5min_breadth-0.5max_breadth)
*(unitvector (direction s of apth) rotated 90),
z3r,
point 0 of apth);
fi;
bottom_part(T);
% The top part of the parenthesis
save top_part;
vardef top_part(expr T) =
filldraw (z1l{3(x2l-x1l),y2-y1}..{down}z2l
--reverse(z1r{3(x2r-x1r),y2-y1}..{down}z2r)
--cycle) transformed T text_;
enddef;
save g;
vardef g(expr t) =
abs(point (length apth) of apth - (point t of apth +
(w-2.5u#+0.5min_breadth+0.5max_breadth)
*(unitvector (direction s of apth) rotated 90)))
< ((h+d) ++ (w-2.5u#+0.5min_breadth+0.5max_breadth))
enddef;
save t; numeric t;
transform T; % transform the top part
if arclength apth = 0:
T := identity shifted (point (length apth) of apth - z1r);
elseif arclength apth < y1-y2+y4-y3:
T := mapto(z2l,
0.5[point 0 of apth, point (length apth) of apth]
+abs(x1r-x2l)*(unitvector (point (length apth) of apth
- point 0 of apth) rotated 90),
z2r,
0.5[point 0 of apth, point (length apth) of apth]
+abs(x1r-x2r)*(unitvector (point (length apth) of apth
- point 0 of apth) rotated 90),
z1r,
point (length apth) of apth);
else:
t := solve g(length apth, 0);
T := mapto(z2l,
point t of apth + (w-2.5u#+0.5min_breadth+0.5max_breadth)
*(unitvector (direction t of apth) rotated 90),
z2r,
point t of apth + (w-2.5u#+0.5min_breadth-0.5max_breadth)
*(unitvector (direction t of apth) rotated 90),
z1r,
point (length apth) of apth);
fi;
top_part(T);
% The extension part
save extension_part;
vardef extension_part(expr ss,tt) =
numeric stp; stp:=(ss-tt) div 5pt;
if stp=0: stp:=1; fi
stp:=(ss-tt)/stp;
pickup pencircle scaled heavy_rule_thickness#;
if stp>0:
draw for uu=ss step stp until tt-stp:
point uu of apth + (w-2.5u#+.5min_breadth)
*(unitvector (direction uu of apth) rotated 90)
{direction uu of apth} ..
endfor
{direction tt of apth}
point tt of apth + (w-2.5u#+.5min_breadth)
*(unitvector (direction tt of apth) rotated 90) text_;
fi
enddef;
if arclength apth > y1-y2+y4-y3:
extension_part(s,t);
fi
pickup prevpen;
enddef;
enddef;
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