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%% rgbx0025.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_paralleloppositerightarrows (expr source_file, cmdname) =
scantokens ("input tgbx0000");
scantokens ("input " & source_file);
expandafter def scantokens cmdname expr p =
scantokens (cmdname & "__rgbxww")(p)
enddef;
expandafter vardef scantokens (cmdname & "__rgbxww " & "(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;
% Path macros
save parallellineright;
vardef parallellineright expr pppp =
save s, stp;
numeric s, stp; stp:=(arclength pppp) div 5pt;
if stp=0: stp:=1; fi
stp:=(arclength pppp)/stp;
if stp>0:
for s=0 step stp until arclength pppp - stp:
point (arctime s of pppp) of pppp +
(.24asc_height#+eps)*(unitvector direction (arctime s of pppp)
of pppp rotated 90)
{direction (arctime s of pppp) of pppp}..
endfor
{direction (length pppp) of pppp}
point (length pppp) of pppp +
(.24asc_height#+eps)*(unitvector direction (length pppp)
of pppp rotated 90)
fi
enddef;
save parallellineleft;
vardef parallellineleft expr pppp =
save s, stp;
numeric s, stp; stp:=(arclength pppp) div 5pt;
if stp=0: stp:=1; fi
stp:=(arclength pppp)/stp;
if stp>0:
for s=0 step stp until arclength pppp - stp:
point (arctime s of pppp) of pppp -
(.24asc_height#+eps)*(unitvector direction (arctime s of pppp)
of pppp rotated 90)
{direction (arctime s of pppp) of pppp}..
endfor
{direction (length pppp) of pppp}
point (length pppp) of pppp -
(.24asc_height#+eps)*(unitvector direction (length pppp)
of pppp rotated 90)
fi
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;
% Macros for drawing the arrow head
save pp; path pp; pp = z4l{z9-z4}..z6r;
save pq; path pq; pq = z0..{z4-z9}z4r;
save right_texarrowhead;
vardef right_texarrowhead(expr T,s) =
(subpath(0, xpart (pq intersectiontimes
(point s of pp -- point s of pp + (2rule_thickness#,0))))
of pq--subpath(s,t) of pp--z2l) transformed T
enddef;
save qq; path qq; qq = z3l{z9-z3}..z5r;
save qp; path qp; qp = z3r{z9-z3}..z0;
save left_texarrowhead;
vardef left_texarrowhead(expr T, s) =
(z2r--subpath(t,s) of qq
--subpath(xpart ( qp intersectiontimes
(point s of qq -- point s of qq + (2rule_thickness#,0)))
,length qp) of qp) transformed T
enddef;
% Draw the arrows. First the left arrow and then the right arrow
save pa, pb, T, tt, ttt;
save f,s;
save p_left; path p_left; p_left := parallellineleft apth;
save p_right; path p_right; p_right := parallellineright apth;
for ppp = p_left, reverse p_right:
transform T;
numeric tt; tt := arctime(arclength ppp - (x0-x9)) of ppp;
numeric ttt; ttt := arctime(arclength ppp - (x0-x2)) of ppp;
% Draw the right half of the arrow head
if arclength ppp = 0:
T:=identity shifted (point (length ppp) of ppp - z0);
elseif arclength ppp < x0-x3l:
T:=identity rotatedaround(z0,angle (direction (length ppp) of ppp))
shifted (point (length ppp) of ppp - z0);
else:
T:=mapto(z0,
point (length ppp) of ppp,
z2,
point ttt of ppp,
z9-(0,3rule_thickness#),
point tt of ppp - 3rule_thickness#
*(unitvector (direction tt of ppp)
rotated 90));
fi
vardef f(expr s) =
length(point s of (pp transformed T) - point tt of ppp)
< length(point 0 of pp - z9)
enddef;
if f(0) or (arclength ppp < x0-x3l): s := 0;
else: s := solve f(length pp, 0);
fi
path pa;
pa := right_texarrowhead(T,s);
% Draw the left part of the arrow head
if arclength ppp = 0:
T:=identity shifted (point (length ppp) of ppp - z0);
elseif arclength ppp < x0-x3l:
T:=identity rotatedaround(z0,angle (direction (length ppp) of ppp))
shifted (point (length ppp) of ppp - z0);
else:
T:=mapto(z0,
point (length ppp) of ppp,
z2,
point ttt of ppp,
z9+(0,3rule_thickness#),
point tt of ppp + 3rule_thickness#
*(unitvector (direction tt of ppp)
rotated 90));
fi
vardef f(expr s) =
length(point s of (qq transformed T) - point tt of ppp)
< length(point 0 of qq - z9)
enddef;
if f(0) or (arclength ppp < x0-x3l): s := 0;
else: s := solve f(length qq, 0);
fi
path pb;
pb := left_texarrowhead(T,s);
filldraw pa--pb--cycle text_;
% Draw the path
if arclength ppp > x0-x2:
draw subpath(0,ttt) of ppp withpen pencircle scaled rule_thickness#
text_;
fi
endfor
pickup prevpen;
enddef;
enddef;
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