NBA_Championship_Teams

flare.json

{
 "name": "NBA Champions",
 "children": [
  {
   "name": "Atlanta Hawks",
   "children": [
    {
     "name": "1958",
     "children": [
      {"name": "Bob Pettit", "size": 3938},
      {"name": "Slater Martin", "size": 3812},
      {"name": "Cliff Hagan", "size": 6714},
      {"name": "Jack McMahon", "size": 743},
	  {"name": "Ed Macauley", "size": 744}
     ]
    }
   ]
  },
   {
   "name": "Boston Celtics",
   "children": [
    {
     "name": "1957",
     "children": [
      {"name": "Bill Russell", "size": 3938},
      {"name": "Bob Cousy", "size": 3812},
      {"name": "Bill Sharman", "size": 6714},
      {"name": "Jim Loscutoff", "size": 743},
	  {"name": "Tom Heinsohn", "size": 744}
     ]
    },
    {
     "name": "1959",
     "children": [
      {"name": "Bill Russell", "size": 3938},
      {"name": "Bob Cousy", "size": 3812},
      {"name": "Bill Sharman", "size": 6714},
      {"name": "Frank Ramsey", "size": 743},
	  {"name": "Tom Heinsohn", "size": 744}
     ]
    },
    {
     "name": "1960",
     "children": [
      {"name": "Bill Russell", "size": 3938},
      {"name": "Bob Cousy", "size": 3812},
      {"name": "Bill Sharman", "size": 6714},
      {"name": "Frank Ramsey", "size": 743},
	  {"name": "Tom Heinsohn", "size": 744}
     ]
    },
    {
     "name": "1961",
     "children": [
      {"name": "Bill Russell", "size": 3938},
      {"name": "Bob Cousy", "size": 3812},
      {"name": "Sam Jones", "size": 6714},
      {"name": "Frank Ramsey", "size": 743},
	  {"name": "Tom Heinsohn", "size": 744}
     ]
    },
    {
     "name": "1962",
     "children": [
      {"name": "Bill Russell", "size": 3938},
      {"name": "Bob Cousy", "size": 3812},
      {"name": "Sam Jones", "size": 6714},
      {"name": "Tom Sanders", "size": 743},
	  {"name": "Tom Heinsohn", "size": 744}
     ]
    },
    {
     "name": "1963",
     "children": [
      {"name": "Bill Russell", "size": 3938},
      {"name": "Bob Cousy", "size": 3812},
      {"name": "Sam Jones", "size": 6714},
      {"name": "Tom Sanders", "size": 743},
	  {"name": "John Havlicek", "size": 744}
     ]
    },
    {
     "name": "1964",
     "children": [
      {"name": "Bill Russell", "size": 3938},
      {"name": "John Havlicek", "size": 3812},
      {"name": "Sam Jones", "size": 6714},
      {"name": "K.C. Jones", "size": 743},
	  {"name": "Tom Sanders", "size": 744}
     ]
    },
    {
     "name": "1965",
     "children": [
      {"name": "Bill Russell", "size": 3938},
      {"name": "John Havlicek", "size": 3812},
      {"name": "Sam Jones", "size": 6714},
      {"name": "K.C. Jones", "size": 743},
	  {"name": "Tom Sanders", "size": 744}
     ]
    },
    {
     "name": "1966",
     "children": [
      {"name": "Bill Russell", "size": 3938},
      {"name": "John Havlicek", "size": 3812},
      {"name": "Sam Jones", "size": 6714},
      {"name": "K.C. Jones", "size": 743},
	  {"name": "Tom Sanders", "size": 744}
     ]
    },
    {
     "name": "1968",
     "children": [
      {"name": "Bill Russell", "size": 3938},
      {"name": "John Havlicek", "size": 3812},
      {"name": "Sam Jones", "size": 6714},
      {"name": "Bailey Howell", "size": 743},
	  {"name": "Tom Sanders", "size": 744}
     ]
    },
    {
     "name": "1969",
     "children": [
      {"name": "Bill Russell", "size": 3938},
      {"name": "John Havlicek", "size": 3812},
      {"name": "Larry Siegfried", "size": 6714},
      {"name": "Bailey Howell", "size": 743},
	  {"name": "Tom Sanders", "size": 744}
     ]
    },
    {
     "name": "1974",
     "children": [
      {"name": "Dave Cowens", "size": 3938},
      {"name": "John Havlicek", "size": 3812},
      {"name": "Jo Jo White", "size": 6714},
      {"name": "Paul Silas", "size": 743},
	  {"name": "Don Chaney", "size": 744}
     ]
    },
    {
     "name": "1976",
     "children": [
      {"name": "Dave Cowens", "size": 3938},
      {"name": "John Havlicek", "size": 3812},
      {"name": "Jo Jo White", "size": 6714},
      {"name": "Paul Silas", "size": 743},
	  {"name": "Charlie Scott", "size": 744}
     ]
    },
    {
     "name": "1981",
     "children": [
      {"name": "Larry Bird", "size": 3938},
      {"name": "Cedric Maxwell", "size": 3812},
      {"name": "Robert Parish", "size": 6714},
      {"name": "Chris Ford", "size": 743},
	  {"name": "Tiny Archibald", "size": 744}
     ]
    },
    {
     "name": "1984",
     "children": [
      {"name": "Larry Bird", "size": 3938},
      {"name": "Cedric Maxwell", "size": 3812},
      {"name": "Robert Parish", "size": 6714},
      {"name": "Dennis Johnson", "size": 743},
	  {"name": "Gerald Henderson", "size": 744}
     ]
    },
    {
     "name": "1986",
     "children": [
      {"name": "Larry Bird", "size": 3938},
      {"name": "Kevin McHale", "size": 3812},
      {"name": "Robert Parish", "size": 6714},
      {"name": "Dennis Johnson", "size": 743},
	  {"name": "Danny Ainge", "size": 744}
     ]
    },
    {
     "name": "2008",
     "children": [
      {"name": "Paul Pierce", "size": 3938},
      {"name": "Kevin Garnett", "size": 3812},
      {"name": "Ray Allen", "size": 6714},
      {"name": "Rajon Rondo", "size": 743},
	  {"name": "Kendrick Perkins", "size": 744}
     ]
    }
   ]
  },
   {
   "name": "Brooklyn Nets"
  },
   {
   "name": "Charlotte Hornets"
  },
    {
   "name": "Chicago Bulls",
   "children": [
    {
     "name": "1991",
     "children": [
      {"name": "Michael Jordan", "size": 3938},
      {"name": "Scottie Pippen", "size": 3812},
      {"name": "Horace Grant", "size": 6714},
      {"name": "Bill Cartwright", "size": 743},
	  {"name": "John Paxton", "size": 744}
     ]
    },
    {
     "name": "1992",
     "children": [
      {"name": "Michael Jordan", "size": 3938},
      {"name": "Scottie Pippen", "size": 3812},
      {"name": "Horace Grant", "size": 6714},
      {"name": "Bill Cartwright", "size": 743},
	  {"name": "John Paxton", "size": 744}
     ]
    },
    {
     "name": "1993",
     "children": [
      {"name": "Michael Jordan", "size": 3938},
      {"name": "Scottie Pippen", "size": 3812},
      {"name": "Horace Grant", "size": 6714},
      {"name": "Bill Cartwright", "size": 743},
	  {"name": "B.J. Armstrong", "size": 744}
     ]
    },
    {
     "name": "1996",
     "children": [
      {"name": "Michael Jordan", "size": 3938},
      {"name": "Scottie Pippen", "size": 3812},
      {"name": "Ron Harper", "size": 6714},
      {"name": "Luc Longley", "size": 743},
	  {"name": "Dennis Rodman", "size": 744}
     ]
    },
    {
     "name": "1997",
     "children": [
      {"name": "Michael Jordan", "size": 3938},
      {"name": "Scottie Pippen", "size": 3812},
      {"name": "Ron Harper", "size": 6714},
      {"name": "Luc Longley", "size": 743},
	  {"name": "Dennis Rodman", "size": 744}
     ]
    },
    {
     "name": "1998",
     "children": [
      {"name": "Michael Jordan", "size": 3938},
      {"name": "Scottie Pippen", "size": 3812},
      {"name": "Ron Harper", "size": 6714},
      {"name": "Luc Longley", "size": 743},
	  {"name": "Dennis Rodman", "size": 744}
     ]
    }
   ]
  },
    {
   "name": "Cleveland Cavaliers",
   "children": [
    {
     "name": "2016",
     "children": [
      {"name": "LeBron James", "size": 3938},
      {"name": "Kyrie Irving", "size": 3812},
      {"name": "Kevin Love", "size": 6714},
      {"name": "JR Smith", "size": 743},
	  {"name": "Timofey Mozgov", "size": 744}
     ]
    }
   ]
  },
    {
   "name": "Dallas Mavericks",
   "children": [
    {
     "name": "2011",
     "children": [
      {"name": "Dirk Nowitzki", "size": 3938},
      {"name": "Jason Kidd", "size": 3812},
      {"name": "Tyson Chandler", "size": 6714},
      {"name": "Jason Terry", "size": 743},
	  {"name": "Caron Butler", "size": 744}
     ]
    }
   ]
  },
    {
   "name": "Denver Nuggets"
  },
    {
   "name": "Detroit Pistons",
   "children": [
    {
     "name": "1989",
     "children": [
      {"name": "Isiah Thomas", "size": 3938},
      {"name": "Joe Dumars", "size": 3812},
      {"name": "Bill Laimbeer", "size": 6714},
      {"name": "Rick Mahorn", "size": 743},
	  {"name": "Andrian Dantley", "size": 744}
     ]
    },
    {
     "name": "1990",
     "children": [
      {"name": "Isiah Thomas", "size": 3938},
      {"name": "Joe Dumars", "size": 3812},
      {"name": "Bill Laimbeer", "size": 6714},
      {"name": "James Edwards", "size": 743},
	  {"name": "Dennis Rodman", "size": 744}
     ]
    },
    {
     "name": "2004",
     "children": [
      {"name": "Rip Hamilton", "size": 3938},
      {"name": "Tayshaun Prince", "size": 3812},
      {"name": "Chauncey Billups", "size": 6714},
      {"name": "Ben Wallace", "size": 743},
	  {"name": "Mehmet Okur", "size": 744}
     ]
    }
   ]
  },
    {
   "name": "Golden State Warriors",
   "children": [
    {
     "name": "1956",
     "children": [
      {"name": "Jack George", "size": 3938},
      {"name": "Paul Arizin", "size": 3812},
      {"name": "Neil Johnston", "size": 6714},
      {"name": "Tom Gola", "size": 743},
	  {"name": "Joe Graboski", "size": 744}
     ]
    },
    {
     "name": "1975",
     "children": [
      {"name": "Rick Barry", "size": 3938},
      {"name": "Butch Beard", "size": 3812},
      {"name": "Jamaal Wilkes", "size": 6714},
      {"name": "Clifford Ray", "size": 743},
	  {"name": "Charles Johnson", "size": 744}
     ]
    },
    {
     "name": "2015",
     "children": [
      {"name": "Stephen Curry", "size": 3938},
      {"name": "Klay Thompson", "size": 3812},
      {"name": "Draymond Green", "size": 6714},
      {"name": "Harrison Barnes", "size": 743},
	  {"name": "Andrew Bogut", "size": 744}
     ]
    }
   ]
  },
    {
   "name": "Houston Rockets",
   "children": [
    {
     "name": "1994",
     "children": [
      {"name": "Hakeem Olajuwon", "size": 3938},
      {"name": "Robert Horry", "size": 3812},
      {"name": "Kenny Smith", "size": 6714},
      {"name": "Vernon Maxwell", "size": 743},
	  {"name": "Otis Thorpe", "size": 744}
     ]
    },
    {
     "name": "1995",
     "children": [
      {"name": "Hakeem Olajuwon", "size": 3938},
      {"name": "Robert Horry", "size": 3812},
      {"name": "Kenny Smith", "size": 6714},
      {"name": "Vernon Maxwell", "size": 743},
	  {"name": "Clyde Drexler", "size": 744}
     ]
    }
   ]
  },
    {
   "name": "Indiana Pacers"
  },
    {
   "name": "LA Clippers"
  },
    {
   "name": "Los Angeles Lakers",
   "children": [
    {
     "name": "1949",
     "children": [
      {"name": "George Mikan", "size": 3938},
      {"name": "Jim Pollard", "size": 3812},
      {"name": "Herm Shaefer", "size": 6714},
      {"name": "Don Carlson", "size": 743},
	  {"name": "Arnie Ferrin", "size": 744}
     ]
    },
    {
     "name": "1950",
     "children": [
      {"name": "George Mikan", "size": 3938},
      {"name": "Jim Pollard", "size": 3812},
      {"name": "Vern Mikkelsen", "size": 6714},
      {"name": "Arnie Ferrin", "size": 743},
	  {"name": "Herm Schaefer", "size": 744}
     ]
    },
    {
     "name": "1952",
     "children": [
      {"name": "George Mikan", "size": 3938},
      {"name": "Vern Mikkelsen", "size": 3812},
      {"name": "Jim Pollard", "size": 6714},
      {"name": "Slater Martin", "size": 743},
	  {"name": "Bob Harrison", "size": 744}
     ]
    },
    {
     "name": "1953",
     "children": [
      {"name": "George Mikan", "size": 3938},
      {"name": "Vern Mikkelsen", "size": 3812},
      {"name": "Jim Pollard", "size": 6714},
      {"name": "Slater Martin", "size": 743},
	  {"name": "Pep Saul", "size": 744}
     ]
    },
    {
     "name": "1954",
     "children": [
      {"name": "George Mikan", "size": 3938},
      {"name": "Jim Pollard", "size": 3812},
      {"name": "Vern Mikkelsen", "size": 6714},
      {"name": "Slater Martin", "size": 743},
	  {"name": "Clyde Lovellette", "size": 744}
     ]
    },
    {
     "name": "1972",
     "children": [
      {"name": "Wilt Chamberlain", "size": 3938},
      {"name": "Jerry West", "size": 3812},
      {"name": "Jim McMilliam", "size": 6714},
      {"name": "Gail Goodrich", "size": 743},
	  {"name": "Happy Hairston", "size": 744}
     ]
    },
    {
     "name": "1980",
     "children": [
      {"name": "Norm Nixon", "size": 3938},
      {"name": "Kareem Abdul-Jabbar", "size": 3812},
      {"name": "Jamaal Wilkes", "size": 6714},
      {"name": "Michael Cooper", "size": 743},
	  {"name": "Magic Johnson", "size": 744}
     ]
    },
    {
     "name": "1982",
     "children": [
      {"name": "Norm Nixon", "size": 3938},
      {"name": "Kareem Abdul-Jabbar", "size": 3812},
      {"name": "Jamaal Wilkes", "size": 6714},
      {"name": "Michael Cooper", "size": 743},
	  {"name": "Magic Johnson", "size": 744}
     ]
    },
    {
     "name": "1985",
     "children": [
      {"name": "Magic Johnson", "size": 3938},
      {"name": "James Worthy", "size": 3812},
      {"name": "Kareem Abdul-Jabbar", "size": 6714},
      {"name": "Bryon Scott", "size": 743},
	  {"name": "Michael Cooper", "size": 744}
     ]
    },
    {
     "name": "1987",
     "children": [
      {"name": "Magic Johnson", "size": 3938},
      {"name": "James Worthy", "size": 3812},
      {"name": "Bryon Scott", "size": 6714},
      {"name": "Kareem Abdul-Jabbar", "size": 743},
	  {"name": "A.C. Green", "size": 744}
     ]
    },
    {
     "name": "1988",
     "children": [
      {"name": "Magic Johnson", "size": 3938},
      {"name": "James Worthy", "size": 3812},
      {"name": "Byron Scott", "size": 6714},
      {"name": "Kareem Abdul-Jabbar", "size": 743},
	  {"name": "A.C. Green", "size": 744}
     ]
    },
    {
     "name": "2000",
     "children": [
      {"name": "Kobe Bryant", "size": 3938},
      {"name": "Shaquille O'Neal", "size": 3812},
      {"name": "Ron Harper", "size": 6714},
      {"name": "Glen Rice", "size": 743},
	  {"name": "A.C. Green", "size": 744}
     ]
    },
    {
     "name": "2001",
     "children": [
      {"name": "Kobe Bryant", "size": 3938},
      {"name": "Shaquille O'Neal", "size": 3812},
      {"name": "Ron Harper", "size": 6714},
      {"name": "Rick Fox", "size": 743},
	  {"name": "Horace Grant", "size": 744}
     ]
    },
    {
     "name": "2002",
     "children": [
      {"name": "Kobe Bryant", "size": 3938},
      {"name": "Shaquille O'Neal", "size": 3812},
      {"name": "Rick Fox", "size": 6714},
      {"name": "Samaki Walker", "size": 743},
	  {"name": "Derek Fisher", "size": 744}
     ]
    },
    {
     "name": "2009",
     "children": [
      {"name": "Kobe Bryant", "size": 3938},
      {"name": "Derek Fisher", "size": 3812},
      {"name": "Pau Gasol", "size": 6714},
      {"name": "Andrew Bynum", "size": 743},
	  {"name": "Lamar Odom", "size": 744}
     ]
    },
    {
     "name": "2010",
     "children": [
      {"name": "Kobe Bryant", "size": 3938},
      {"name": "Derek Fisher", "size": 3812},
      {"name": "Pau Gasol", "size": 6714},
      {"name": "Andrew Bynum", "size": 743},
	  {"name": "Metta World Peace", "size": 744}
     ]
    }
   ]
  },
    {
   "name": "Memphis Grizzlies"
  },
    {
   "name": "Miami Heat",
   "children": [
    {
     "name": "2006",
     "children": [
      {"name": "Dwyane Wade", "size": 3938},
      {"name": "Shaquille O'Neal", "size": 3812},
      {"name": "Udonis Haslem", "size": 6714},
      {"name": "James Posey", "size": 743},
	  {"name": "Jason Williams", "size": 744}
     ]
    },
   {
     "name": "2012",
     "children": [
      {"name": "Dwyane Wade", "size": 3938},
      {"name": "LeBron James", "size": 3812},
      {"name": "Chris Bosh", "size": 6714},
      {"name": "Mario Chalmers", "size": 743},
	  {"name": "Joel Anthony", "size": 744}
     ]
    },
    {
     "name": "2013",
     "children": [
      {"name": "Dwyane Wade", "size": 3938},
      {"name": "LeBron James", "size": 3812},
      {"name": "Chris Bosh", "size": 6714},
      {"name": "Mario Chalmers", "size": 743},
	  {"name": "Udonis Haslem", "size": 744}
     ]
    }
   ]
  },
    {
   "name": "Milwaukee Bucks",
   "children": [
    {
     "name": "1971",
     "children": [
      {"name": "Kareem Abdul-Jabbar", "size": 3938},
      {"name": "Oscar Robertson", "size": 3812},
      {"name": "Bob Dandridge", "size": 6714},
      {"name": "Jon McGlocklin", "size": 743},
	  {"name": "Greg Smith", "size": 744}
     ]
    }
   ]
  },
     {
   "name": "Minnesota Timberwolves"
  },
     {
   "name": "New Orleans Pelicans"
  },
     {
   "name": "New York Knicks",
   "children": [
    {
     "name": "1970",
     "children": [
      {"name": "Walt Frazier", "size": 3938},
      {"name": "Willis Reed", "size": 3812},
      {"name": "Dick Barnett", "size": 6714},
      {"name": "Dave DeBusschere", "size": 743},
	  {"name": "Bill Bradley", "size": 744}
     ]
    },
    {
     "name": "1973",
     "children": [
      {"name": "Walt Frazier", "size": 3938},
      {"name": "Willis Reed", "size": 3812},
      {"name": "Earl Monroe", "size": 6714},
      {"name": "Dave DeBusschere", "size": 743},
	  {"name": "Bill Bradley", "size": 744}
     ]
    }
   ]
  },
     {
   "name": "OKC Thunder",
   "children": [
    {
     "name": "1979 (Supersonics)",
     "children": [
      {"name": "Jack Sikma", "size": 3938},
      {"name": "Dennis Johnson", "size": 3812},
      {"name": "Gus Williams", "size": 6714},
      {"name": "John Johnson", "size": 743},
	  {"name": "Lonnie Shelton", "size": 744}
     ]
    }
   ]
  },
     {
   "name": "Orlando Magic"
  },
    {
   "name": "Philadelphia 76ers",
   "children": [
    {
     "name": "1967",
     "children": [
      {"name": "Wilt Chamberlain", "size": 3938},
      {"name": "Hal Greer", "size": 3812},
      {"name": "Chet Walker", "size": 6714},
      {"name": "Luke Jackson", "size": 743},
	  {"name": "Wali Jones", "size": 744}
     ]
    },
    {
     "name": "1983",
     "children": [
      {"name": "Moses Malone", "size": 3938},
      {"name": "Julius Erving", "size": 3812},
      {"name": "Maurice Cheeks", "size": 6714},
      {"name": "Andrew Toney", "size": 743},
	  {"name": "Marc Iavaroni", "size": 744}
     ]
    }
   ]
  },
    {
   "name": "Pheonix Suns"
  },
    {
   "name": "Sacramento Kings",
   "children": [
    {
     "name": "1951 (Royals)",
     "children": [
      {"name": "Arnie Risen", "size": 3938},
      {"name": "Bob Davies", "size": 3812},
      {"name": "Jack Coleman", "size": 6714},
      {"name": "Bobby Wanzer", "size": 743},
	  {"name": "Arnie Johnson", "size": 744}
     ]
    }
   ]
  },
    {
   "name": "San Antonio Spurs",
   "children": [
    {
     "name": "1999",
     "children": [
      {"name": "Tim Duncan", "size": 3938},
      {"name": "David Robinson", "size": 3812},
      {"name": "Avery Johnson", "size": 6714},
      {"name": "Sean Elliot", "size": 743},
	  {"name": "Mario Elie", "size": 744}
     ]
    },
    {
     "name": "2003",
     "children": [
      {"name": "Tim Duncan", "size": 3938},
      {"name": "Tony Parker", "size": 3812},
      {"name": "Bruce Bowan", "size": 6714},
      {"name": "David Robinson", "size": 743},
	  {"name": "Stephen Jackson", "size": 744}
     ]
    },
    {
     "name": "2005",
     "children": [
      {"name": "Tim Duncan", "size": 3938},
      {"name": "Tony Parker", "size": 3812},
      {"name": "Bruce Bowan", "size": 6714},
      {"name": "Manu Ginobli", "size": 743},
	  {"name": "Rasho Nesterovic", "size": 744}
     ]
    },
    {
     "name": "2007",
     "children": [
      {"name": "Tim Duncan", "size": 3938},
      {"name": "Tony Parker", "size": 3812},
      {"name": "Bruce Bowan", "size": 6714},
      {"name": "Manu Ginobli", "size": 743},
	  {"name": "Brent Barry", "size": 744}
     ]
    },
    {
     "name": "2014",
     "children": [
      {"name": "Tim Duncan", "size": 3938},
      {"name": "Tony Parker", "size": 3812},
      {"name": "Manu Ginobli", "size": 6714},
      {"name": "Kawhi Leonard", "size": 743},
	  {"name": "Danny Green", "size": 744}
     ]
    }
   ]
  },
     {
   "name": "Toronoto Raptors"
  },
  {
   "name": "Utah Jazz"
  }
 ]
}

index.html

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.node {
  cursor: pointer;
}

.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 1.5px;
}

.node text {
  font: 14px sans-serif;
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 1.5px;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var margin = {top: 20, right: 120, bottom: 20, left: 120},
    width = 960 - margin.right - margin.left,
    height = 800 - margin.top - margin.bottom;

var i = 0,
    duration = 750,
    root;

var tree = d3.layout.tree()
    .size([height, width]);

var diagonal = d3.svg.diagonal()
    .projection(function(d) { return [d.y, d.x]; });

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.right + margin.left)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.json("flare.json", function(error, flare) {
  if (error) throw error;

  root = flare;
  root.x0 = height / 2;
  root.y0 = 0;

  function collapse(d) {
    if (d.children) {
      d._children = d.children;
      d._children.forEach(collapse);
      d.children = null;
    }
  }

  root.children.forEach(collapse);
  update(root);
});

d3.select(self.frameElement).style("height", "800px");

function update(source) {

  // Compute the new tree layout.
  var nodes = tree.nodes(root).reverse(),
      links = tree.links(nodes);

  // Normalize for fixed-depth.
  nodes.forEach(function(d) { d.y = d.depth * 180; });

  // Update the nodes…
  var node = svg.selectAll("g.node")
      .data(nodes, function(d) { return d.id || (d.id = ++i); });

  // Enter any new nodes at the parent's previous position.
  var nodeEnter = node.enter().append("g")
      .attr("class", "node")
      .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; })
      .on("click", click);

  nodeEnter.append("circle")
      .attr("r", 1e-6)
      .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

  nodeEnter.append("text")
      .attr("x", function(d) { return d.children || d._children ? -10 : 10; })
      .attr("dy", ".35em")
      .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
      .text(function(d) { return d.name; })
      .style("fill-opacity", 1e-6);

  // Transition nodes to their new position.
  var nodeUpdate = node.transition()
      .duration(duration)
      .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });

  nodeUpdate.select("circle")
      .attr("r", 4.5)
      .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

  nodeUpdate.select("text")
      .style("fill-opacity", 1);

  // Transition exiting nodes to the parent's new position.
  var nodeExit = node.exit().transition()
      .duration(duration)
      .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
      .remove();

  nodeExit.select("circle")
      .attr("r", 1e-6);

  nodeExit.select("text")
      .style("fill-opacity", 1e-6);

  // Update the links…
  var link = svg.selectAll("path.link")
      .data(links, function(d) { return d.target.id; });

  // Enter any new links at the parent's previous position.
  link.enter().insert("path", "g")
      .attr("class", "link")
      .attr("d", function(d) {
        var o = {x: source.x0, y: source.y0};
        return diagonal({source: o, target: o});
      });

  // Transition links to their new position.
  link.transition()
      .duration(duration)
      .attr("d", diagonal);

  // Transition exiting nodes to the parent's new position.
  link.exit().transition()
      .duration(duration)
      .attr("d", function(d) {
        var o = {x: source.x, y: source.y};
        return diagonal({source: o, target: o});
      })
      .remove();

  // Stash the old positions for transition.
  nodes.forEach(function(d) {
    d.x0 = d.x;
    d.y0 = d.y;
  });
}

// Toggle children on click.
function click(d) {
  if (d.children) {
    d._children = d.children;
    d.children = null;
  } else {
    d.children = d._children;
    d._children = null;
  }
  update(d);
}

</script>