partei.js

var margin = {top: 280, right: 280, bottom: 250, left: 280},
    radius = Math.min(margin.top, margin.right, margin.bottom, margin.left);

var hue = d3.scale.category10();

/*
var luminance = d3.scale.sqrt()
    .domain([0, 1e6])
    .clamp(true)
    .range([90, 20]);
*/

var svg = d3.select(".content").append("svg")
    .attr("width", 500)
    .attr("height", 500)
    .append("g")
    .attr("transform", "translate(" + (margin.left-40) + "," + (margin.top-50) + ")");

var tip = d3.tip()
  .attr("class", "d3-tip")
  .offset([-10, 0])
  .html( function(d){
    if( d.children ){
      return "<text>" + d.name +"</br> Zum Hineinzoomen klicken</text>"
    }else if( d.depth === 2 ){
      return tip.hide(); //sifu - wie kann man das "richtig" lösen. das stimmt so nicht, produziert einen Fehler auf der Konsole, macht aber was ich will (tip erscheint nicht.)
    }else{
      return "<text><strong>"+d.name+":</br>"+d.partei+",</br>"+d.info+"</strong></text>"
    }
  });

svg.call(tip);

var partition = d3.layout.partition()
    //.sort(function(a, b) { return d3.ascending(a.name, b.name); })
    .size([2 * Math.PI, radius]);

var arc = d3.svg.arc()
    .startAngle( function(d){ return d.x; } )
    .endAngle( function(d){ return d.x + d.dx - 0.01 / ( d.depth + 0.5 ); } )
    .innerRadius( function(d){ return radius / 3 * d.depth; } )
    .outerRadius( function(d){ return radius / ( 2 + d.depth ) * ( d.depth + 1 ) -1; } )

/*
var arc = d3.svg.arc()
    .startAngle(function(d) { return d.x; })
    .endAngle(function(d) { return d.x + d.dx - .01 / (d.depth + .5); })
    .innerRadius(function(d) { return radius / 3 * d.depth; })
    .outerRadius(function(d) { return radius / 3 * (d.depth + 1) - 1; });
*/


d3.json("partei.json", function(error, root) {

  // Compute the initial layout on the entire tree to sum sizes.
  // Also compute the full name and fill color for each node,
  // and stash the children so they can be restored as we descend.
  partition
      .value(function(d) { return d.value; })
      .nodes(root)
      .forEach(function(d) {
        d._children = d.children;
        d.sum = d.value;
        d.key = key(d);
        d.fill = fill(d);
      });

  // Now redefine the value function to use the previously-computed sum.
  partition
      .children(function(d, depth) { return depth < 2 ? d._children : null; })
      .value(function(d) { return d.sum; });

  var center = svg.append("circle")
      .attr("r", radius / 3)
      .on("click", zoomOut);

  svg.append("text") //tuste nicht in circle rein, sondern einfach dahinter? dann geht er
          .text("Stiftungsrat")
           .attr("x", - 45 );

  var path = svg.selectAll("path")
      .data(partition.nodes(root).slice(1))
    .enter().append("path")
      .attr("d", arc)
      .style("fill", function(d) { return d.fill; })
      .style("fill-opacity", function(d){
            if(d.depth===2){
              return 0.01;
            }else{
              return 1;
            }
          })
      .each(function(d) { this._current = updateArc(d); })
      .on("click", zoomIn)
      .on("mouseover", tip.show )
      .on("mouseout", tip.hide);

  function zoomIn(p) {
    if (p.depth > 1) p = p.parent;
    if (!p.children) return;
    zoom(p, p);
  }

  function zoomOut(p) {
    if (!p.parent) return;
    zoom(p.parent, p);
  }

  // Zoom to the specified new root.
  function zoom(root, p) {
    if (document.documentElement.__transition__) return;

    // Rescale outside angles to match the new layout.
    var enterArc,
        exitArc,
        outsideAngle = d3.scale.linear().domain([0, 2 * Math.PI]);

    function insideArc(d) {
      return p.key > d.key
          ? {depth: d.depth - 1, x: 0, dx: 0} : p.key < d.key
          ? {depth: d.depth - 1, x: 2 * Math.PI, dx: 0}
          : {depth: 0, x: 0, dx: 2 * Math.PI};
    }

    function outsideArc(d) {
      return {depth: d.depth + 1, x: outsideAngle(d.x), dx: outsideAngle(d.x + d.dx) - outsideAngle(d.x)};
    }

    center.datum(root);

    // When zooming in, arcs enter from the outside and exit to the inside.
    // Entering outside arcs start from the old layout.
    if (root === p) enterArc = outsideArc, exitArc = insideArc, outsideAngle.range([p.x, p.x + p.dx]);

    path = path.data(partition.nodes(root).slice(1), function(d) { return d.key; });

    // When zooming out, arcs enter from the inside and exit to the outside.
    // Exiting outside arcs transition to the new layout.
    if (root !== p) enterArc = insideArc, exitArc = outsideArc, outsideAngle.range([p.x, p.x + p.dx]);

    d3.transition().duration(d3.event.altKey ? 7500 : 750).each(function() {
      path.exit().transition()
          .style("fill-opacity", function(d) { return d.depth === 1 + (root === p) ? 1 : 0; })
          .attrTween("d", function(d) { return arcTween.call(this, exitArc(d)); })
          .remove();

      path.enter().append("path")
          .style("fill-opacity", function(d) { return d.depth === 2 - (root === p) ? 1 : 0; })
          .style("fill", function(d) { return d.fill; })
          .on("click", zoomIn)
          .each(function(d) { this._current = enterArc(d); })
          .on("mouseover", tip.show )
          .on("mouseout", tip.hide);

      path.transition()
          .style("fill-opacity", 1)
          .style("fill-opacity", function(d){
            if(d.depth===2){
              return 0.01;
            }else{
              return 1;
            }
          })
          .attrTween("d", function(d) { return arcTween.call(this, updateArc(d)); });
    });
  }
});

function key(d) {
  var k = [], p = d;
  while (p.depth) k.push(p.name), p = p.parent;
  return k.reverse().join(".");
}

function fill(d){
  var p = d;
  var c;
  if(p.depth === 1){
    var colors = {
     'SPÖ': 'red',
     'ÖVP': 'black',
     'FPÖ': 'blue',
     'Grüne': 'green',
     'BZÖ': 'orange',
     'unabhängig': '#999',
     'Krone': '#999'
  }
  return colors[p.name];
  }else if(p.depth === 2){
    var c = "#999";
    return c;
  }
}


function arcTween(b) {
  var i = d3.interpolate(this._current, b);
  this._current = i(0);
  return function(t) {
    return arc(i(t));
  };
}

function updateArc(d) {
  return {depth: d.depth, x: d.x, dx: d.dx};
}

d3.select(self.frameElement).style("height", margin.top + margin.bottom + "px");