var dependency =
{
  Stay_Is: {
    used:{class:[{Stay_Is:"+obli"}, {Stay_Js:"+obli"}]},
    unused:{class:[{Stay_Is:"-obli"}, {Stay_Js:"-obli"}]}},
  Sail_Number: {
    yes:{class:[{_Numbers:"+obli"}]},
    unused:{class:[{_Numbers:"-obli"}]}},
  Luff: {
    used:{calc:[set_area]},
    blur:{take:["Head_I","Head_J"],max:hypotenuse}
    },
  Leech: {
    used:{calc:[set_area]}},
  Foot: {
    used:{calc:[set_area]}},
  LP: {
    used:{calc:[set_area]}},
  _Sail_Type:
  {
    _any_:{class:[{Stay_Is:"opti"}, {Stay_Js:"opti"}]},
    Genoa_1:{take:["Head_J","LP",1.5],calc:set_lp},
    Genoa_2:{take:["Head_J","LP",1.35],calc:set_lp},
    Genoa_3:{take:["Head_J","LP",1.1],calc:set_lp},
    Staysail:{class:[{Stay_Is:"obli"}, {Stay_Js:"obli"}]}
  }
};
function set_lp(e,ids)
{
  if (ids.length == 3)
  {
    var a = getFloatOf(ids[0]);
    var g = ids[2];
    var lp = a*g;
    if (lp > 0)
    {
      setFloatOf(ids[1],lp,2);
    }
  }
  return null;
}