%% tgbx0006.mp %% Copyright 2006 Tommy Ekola % % 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;