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+%% tgbx0006.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_parallelarrows (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 math_spread, x_height, u, rule_thickness, bar, math_axis," &
+ " asc_height, eps, fudge, crisp, hair;" &
+
+ "math_spread :=" & decimal math_spread & ";" &
+ "x_height# :=" & decimal x_height# & ";" &
+ "u# :=" & decimal u# & ";" &
+ "rule_thickness# :=" & decimal rule_thickness# & ";" &
+ "bar# :=" & decimal bar# & ";" &
+ "math_axis# :=" & decimal math_axis# & ";" &
+ "asc_height# :=" & decimal asc_height# & ";" &
+ "eps :=" & decimal eps & ";" &
+ "fudge :=" & decimal fudge & ";" &
+ "crisp# :=" & decimal crisp# & ";" &
+ "hair# :=" & decimal hair# & ";")
+
+ save prevpen;
+ prevpen:=savepen;
+
+ save x,y;
+ numeric x[], x[]', x[]l, x[]'l, x[]r, x[]'r,
+ y[], y[]', y[]l, y[]'l, y[]r, y[]'r;
+
+ save spread, w;
+ numeric spread, w;
+
+ if crisp#>fudge*hair#:
+ crisp#:=fudge*hair#;
+ fi
+ pickup if crisp#=0: nullpen else: pencircle scaled crisp# fi;
+
+ spread = math_spread[.45x_height#, .55x_height#];
+ w = 18u#;
+
+ penpos1(rule_thickness#, 90); penpos2(rule_thickness#, 90);
+ penpos3(bar#, 0); penpos4(bar#, 0);
+ y0=y1=y2=math_axis#; x1-.5rule_thickness#=u#; rt x0=w-u#;
+ y3-y0=y0-y4=.24asc_height#+eps;
+ x3=x4=x0-3u#-eps;
+ penpos5(bar#, angle(z4-z0)); z5l=z0;
+ penpos6(bar#, angle(z3-z0)); z6l=z0;
+ z9=.381966[.5[z3,z4],z0];
+
+ save pp; path pp; pp = z4l{z9-z4}..z6r;
+ save t; numeric t; t = xpart(pp intersectiontimes ((0,y2l)--(w,y2l)));
+ x2=xpart point t of pp;
+
+ save texarrowhead;
+ vardef texarrowhead(expr T) =
+ filldraw (z0..{z4-z9}z4r--subpath(0,t) of pp
+ --z2l--z2r--subpath(t,0) of (z3l{z9-z3}..z5r)
+ --z3r{z9-z3}..z0 & cycle) transformed T text_;
+ enddef;
+
+ 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;
+
+ save tt; numeric tt; tt = arctime(arclength apth - (x0-x3l)) of apth;
+ save ttt; numeric ttt; ttt = arctime(arclength apth - (x0-x2)) of apth;
+
+ save parallelline;
+ vardef parallelline expr ppp =
+ save s, stp;
+ numeric s, stp; stp:=(arclength ppp) div 5pt;
+ if stp=0: stp:=1; fi
+ stp:=(arclength ppp)/stp;
+
+ if stp>0:
+ draw for s=0 step stp until arclength ppp - stp:
+ point (arctime s of ppp) of ppp +
+ (.24asc_height#+eps)*(unitvector direction (arctime s of ppp)
+ of ppp rotated 90)
+ {direction (arctime s of ppp) of ppp}..
+ endfor
+ {direction (length ppp) of ppp}
+ point (length ppp) of ppp +
+ (.24asc_height#+eps)*(unitvector direction (length ppp)
+ of ppp rotated 90)
+ withpen pencircle scaled rule_thickness# text_;
+
+ draw for s=0 step stp until arclength ppp - stp:
+ point (arctime s of ppp) of ppp -
+ (.24asc_height#+eps)*(unitvector direction (arctime s of ppp)
+ of ppp rotated 90)
+ {direction (arctime s of ppp) of ppp}..
+ endfor
+ {direction (length ppp) of ppp}
+ point (length ppp) of ppp -
+ (.24asc_height#+eps)*(unitvector direction (length ppp)
+ of ppp rotated 90)
+ withpen pencircle scaled rule_thickness# text_;
+ fi
+ enddef;
+
+ if arclength apth > x0-x2: parallelline subpath(0,ttt) of apth; fi
+
+ save T; transform T;
+ if arclength apth = 0:
+ T:=identity shifted (point (length apth) of apth - z0)
+ shifted (0,.24asc_height#+eps);
+ elseif arclength apth < x0-x3l:
+ T:=identity rotatedaround(z0,angle (direction (length apth) of apth))
+ shifted (point (length apth) of apth - z0)
+ shifted ((.24asc_height#+eps)*
+ (unitvector (direction (length apth) of apth) rotated 90));
+ else:
+ T:=mapto(z0,
+ point (length apth) of apth +
+ (.24asc_height#+eps)*
+ (unitvector (direction (length apth) of apth) rotated 90),
+ z2,
+ point ttt of apth +
+ (.24asc_height#+eps)*
+ (unitvector (direction (length apth) of apth) rotated 90),
+ z3l,
+ point tt of apth);
+ fi
+ texarrowhead(T);
+
+ if arclength apth = 0:
+ T:=identity shifted (point (length apth) of apth - z0)
+ shifted (0,-.24asc_height#+eps);
+ elseif arclength apth < x0-x3l:
+ T:=identity rotatedaround(z0,angle (direction (length apth) of apth))
+ shifted (point (length apth) of apth - z0)
+ shifted ((.24asc_height#+eps)*
+ (unitvector (direction (length apth) of apth) rotated -90));
+ else:
+ T:=mapto(z0,
+ point (length apth) of apth -
+ (.24asc_height#+eps)*
+ (unitvector (direction (length apth) of apth) rotated 90),
+ z2,
+ point ttt of apth -
+ (.24asc_height#+eps)*
+ (unitvector (direction (length apth) of apth) rotated 90),
+ z4l,
+ point tt of apth);
+ fi
+ texarrowhead(T);
+
+ pickup prevpen;
+
+ enddef;
+
+enddef; \ No newline at end of file