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boolean debug;

pad := 0.1;
debug := false;

def insert (expr bp)(suffix s)(text loops)=
  forsuffixes $=loops:
    if $=1:
      subpath(0, s[$]t * length bp - pad) of bp
    fi .. 
      if length s[$]p = 4:
        {direction s[$]t * length bp of bp rotated 180}(point 2 of s[$]p)
      else:
        subpath(2, length s[$]p-2) of s[$]p
      fi rotated angle direction s[$]t * length bp of bp shifted point s[$]t * length bp of bp .. 
      subpath(s[$]t * length bp + pad, (if known s[$+1]t: s[$+1]t * length bp - pad else: length bp fi)) of bp
  endfor
enddef;

def loop(expr height) = 
  (-.75height,0) .. (0,0) .. {-1,0}(0, height) .. (0,0) .. (.75height,0) enddef;


%%
%% The idea is to draw loops and toinsert them into other shapes at a 'time'.
%% This time lies between 0 and 1
%% 
%% The easiest way to modify the drawing is by changing the main shape at te bottom
%% of the file
%%

beginfig(1);

  path l[][]p, main;
  numeric l[][]t;

  %% Contsructing loop 1 and its subloops
  l[1][1]p = loop(15mm);
  l[1][1]t = .3;

  l[1][2]p = loop(19mm);
  l[1][2]t = 2/4;

  l[1][3]p = loop(9mm);
  l[1][3]t = .6;

  l[4][1]t = 1.5/6;
  l[4][1]p = insert(loop(40mm), l[1], 1, 2, 3);

 
  %% Constructing loop 2 and its subloops
  l[2][1]p = loop(12mm);
  l[2][1]t = .3;

  l[5][1]p = loop(4mm);
  l[5][1]t = .35;

  l[5][2]p = loop(4mm);
  l[5][2]t = .5;

  l[2][2]p = insert(loop(15mm), l[5], 1, 2);
  l[2][2]t = .5;

  l[2][3]p = loop(9mm);
  l[2][3]t = .7;
 
  l[4][2]t = 3/6;
  l[4][2]p = insert(loop(40mm), l[2], 1, 2, 3);


  %% Constructing loop 3 and its subloops
  l[3][1]p = loop(10mm);
  l[3][1]t = .3;

  l[3][2]p = loop(12mm);
  l[3][2]t = .4;

  l[3][3]p = loop(10mm);
  l[3][3]t = .5;

  l[3][4]p = loop(8mm);
  l[3][4]t = .6;

  l[3][5]p = loop(15mm);
  l[3][5]t = .7;

  l[4][3]t = 4.5/6;
  l[4][3]p = insert(loop(40mm), l[3], 1, 2, 3, 4, 5);

  %% Definition of the main shape, and the insertion of the subloops
  main = insert((0,0) -- (0,400mm), l[4], 1, 2, 3);
  draw main;

  % Drawing debug information
  if debug:  
    for s=0 step 1 until length main:
      dotlabel.bot(decimal s, point s of main) withcolor red;
    endfor
  fi
endfig;

end;