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Diffstat (limited to 'Master/texmf-dist/metapost/cmarrows/sgbx0022.mp')
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diff --git a/Master/texmf-dist/metapost/cmarrows/sgbx0022.mp b/Master/texmf-dist/metapost/cmarrows/sgbx0022.mp new file mode 100644 index 00000000000..f5091b73d07 --- /dev/null +++ b/Master/texmf-dist/metapost/cmarrows/sgbx0022.mp @@ -0,0 +1,181 @@ +%% sgbx0022.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_texarrow (expr source_file, cmdname) = + + scantokens ("input tgbx0000"); + + scantokens ("input " & source_file); + + expandafter def scantokens cmdname expr p = + scantokens (cmdname & "__sgbxww")(p) + enddef; + + expandafter vardef scantokens (cmdname & "__sgbxww " & "(expr apth) " & + "text text_ = " & + + "save math_spread, x_height, u, rule_thickness, math_axis," & + " monospace,asc_height,eps, fudge, crisp, hair;" & + "boolean monospace;" & + + "u# := " & decimal u# & ";" & + "math_spread := " & decimal math_spread & ";" & + "x_height# := " & decimal x_height# & ";" & + "rule_thickness# := " & decimal rule_thickness# & ";" & + "math_axis# := " & decimal math_axis# & ";" & + "monospace := " & if monospace : "true" else: "false" fi & ";" & + "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(rule_thickness#, 0); penpos4(rule_thickness#, 0); + y0=y1=y2=math_axis#; x1-.5rule_thickness#=u#; rt x0=w-u#; + y3-y0=y0-y4=if monospace: .24 else: .36 fi asc_height#+eps; + x3=x4=x0-if monospace: 3u# else: 4u# fi - eps; + penpos5(rule_thickness#, angle(z4-z0)); z5l=z0; + penpos6(rule_thickness#, angle(z3-z0)); z6l=z0; + z9=.2[.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 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 T; transform T; + save tt; numeric tt; tt = arctime(arclength apth - (x0-x9)) of apth; + save ttt; numeric ttt; ttt = arctime(arclength apth - (x0-x2)) of apth; + + % Draw the right half of the arrow head + + save right_texarrowhead, pa; + vardef right_texarrowhead(expr T,s) = + (subpath(0, xpart ((z0..{z4-z9}z4r) intersectiontimes + (point s of pp -- point s of pp + (2rule_thickness#,0)))) + of (z0..{z4-z9}z4r)--subpath(s,t) of pp--z2l) transformed T + enddef; + + if arclength apth = 0: + T:=identity shifted (point (length apth) of apth - z0); + elseif arclength apth < x0-x3l: + T:=identity rotatedaround(z0,angle (direction (length apth) of apth)) + shifted (point (length apth) of apth - z0); + else: + T:=mapto(z0, + point (length apth) of apth, + z2, + point ttt of apth, + z9-(0,3rule_thickness#), + point tt of apth - 3rule_thickness# + *(unitvector (direction tt of apth) + rotated 90)); + fi + + save f,s; + vardef f(expr s) = + length(point s of (pp transformed T) - point tt of apth) + < length(point 0 of pp - z9) + enddef; + + if f(0) or (arclength apth < 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 + + pp := (z3l{z9-z3}..z5r); + save pq; path pq; pq := (z3r{z9-z3}..z0); + + save left_texarrowhead, pb; + vardef left_texarrowhead(expr T, s) = + (z2r--subpath(t,s) of pp + --subpath(xpart ( pq intersectiontimes + (point s of pp -- point s of pp + (2rule_thickness#,0))) + ,length pq) of pq) transformed T + enddef; + + if arclength apth = 0: + T:=identity shifted (point (length apth) of apth - z0); + elseif arclength apth < x0-x3l: + T:=identity rotatedaround(z0,angle (direction (length apth) of apth)) + shifted (point (length apth) of apth - z0); + else: + T:=mapto(z0, + point (length apth) of apth, + z2, + point ttt of apth, + z9+(0,3rule_thickness#), + point tt of apth + 3rule_thickness# + *(unitvector (direction tt of apth) + rotated 90)); + fi + + vardef f(expr s) = + length(point s of (pp transformed T) - point tt of apth) + < length(point 0 of pp - z9) + enddef; + + if f(0) or (arclength apth < x0-x3l): s := 0; + else: s := solve f(length pp, 0); + fi + + path pb; + pb := left_texarrowhead(T,s); + + filldraw pa--pb--cycle text_; + + % Draw the path + + if arclength apth > x0-x2: + draw subpath(0,ttt) of apth withpen pencircle scaled rule_thickness# + text_; + fi + + pickup prevpen; + + enddef; + +enddef;
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