D3js: label Otomatis penempatan untuk menghindari tumpang tindih? (gaya tolakan)

function arrangeLabels() {
  var move = 1;
  while(move > 0) {
    move = 0;
    svg.selectAll(".place-label")
       .each(function() {
         var that = this,
             a = this.getBoundingClientRect();
         svg.selectAll(".place-label")
            .each(function() {
              if(this != that) {
                var b = this.getBoundingClientRect();
                if(overlap) {
                  // determine amount of movement, move labels
                }
              }
            });
       });
  }
}

// Place and label location
var foci = [],
    labels = [];

// Store the projected coordinates of the places for the foci and the labels
places.features.forEach(function(d, i) {
    var c = projection(d.geometry.coordinates);
    foci.push({x: c[0], y: c[1]});
    labels.push({x: c[0], y: c[1], label: d.properties.name})
});

// Create the force layout with a slightly weak charge
var force = d3.layout.force()
    .nodes(labels)
    .charge(-20)
    .gravity(0)
    .size([width, height]);

// Append the place labels, setting their initial positions to
// the feature's centroid
var placeLabels = svg.selectAll('.place-label')
    .data(labels)
    .enter()
    .append('text')
    .attr('class', 'place-label')
    .attr('x', function(d) { return d.x; })
    .attr('y', function(d) { return d.y; })
    .attr('text-anchor', 'middle')
    .text(function(d) { return d.label; });

force.on("tick", function(e) {
    var k = .1 * e.alpha;
    labels.forEach(function(o, j) {
        // The change in the position is proportional to the distance
        // between the label and the corresponding place (foci)
        o.y += (foci[j].y - o.y) * k;
        o.x += (foci[j].x - o.x) * k;
    });

    // Update the position of the text element
    svg.selectAll("text.place-label")
        .attr("x", function(d) { return d.x; })
        .attr("y", function(d) { return d.y; });
});

force.start();

var label_array = [];
var anchor_array = [];

//Create circles
svg.selectAll("circle")
.data(dataset)
.enter()
.append("circle")
.attr("id", function(d){
    var text = getRandomStr();
    var id = "point-" + text;
    var point = { x: xScale(d[0]), y: yScale(d[1]) }
    var onFocus = function(){
        d3.select("#" + id)
            .attr("stroke", "blue")
            .attr("stroke-width", "2");
    };
    var onFocusLost = function(){
        d3.select("#" + id)
            .attr("stroke", "none")
            .attr("stroke-width", "0");
    };
    label_array.push({x: point.x, y: point.y, name: text, width: 0.0, height: 0.0, onFocus: onFocus, onFocusLost: onFocusLost});
    anchor_array.push({x: point.x, y: point.y, r: rScale(d[1])});
    return id;                                   
})
.attr("fill", "green")
.attr("cx", function(d) {
    return xScale(d[0]);
})
.attr("cy", function(d) {
    return yScale(d[1]);
})
.attr("r", function(d) {
    return rScale(d[1]);
});

//Create labels
var labels = svg.selectAll("text")
.data(label_array)
.enter()
.append("text")
.attr("class", "label")
.text(function(d) {
    return d.name;
})
.attr("x", function(d) {
    return d.x;
})
.attr("y", function(d) {
    return d.y;
})
.attr("font-family", "sans-serif")
.attr("font-size", "11px")
.attr("fill", "black")
.on("mouseover", function(d){
    d3.select(this).attr("fill","blue");
    d.onFocus();
})
.on("mouseout", function(d){
    d3.select(this).attr("fill","black");
    d.onFocusLost();
});

var links = svg.selectAll(".link")
.data(label_array)
.enter()
.append("line")
.attr("class", "link")
.attr("x1", function(d) { return (d.x); })
.attr("y1", function(d) { return (d.y); })
.attr("x2", function(d) { return (d.x); })
.attr("y2", function(d) { return (d.y); })
.attr("stroke-width", 0.6)
.attr("stroke", "gray");

var index = 0;
labels.each(function() {
    label_array[index].width = this.getBBox().width;
    label_array[index].height = this.getBBox().height;
    index += 1;
});

d3.labeler()
    .label(label_array)
    .anchor(anchor_array)
    .width(w)
    .height(h)
    .start(50);

labels
    .transition()
    .duration(800)
    .attr("x", function(d) { return (d.x); })
    .attr("y", function(d) { return (d.y); });

links
    .transition()
    .duration(800)
    .attr("x2",function(d) { return (d.x); })
    .attr("y2",function(d) { return (d.y); });

const labelPadding = 2;

// the component used to render each label
const textLabel = layoutTextLabel()
  .padding(labelPadding)
  .value(d => d.properties.name);

// a strategy that combines simulated annealing with removal
// of overlapping labels
const strategy = layoutRemoveOverlaps(layoutGreedy());

// create the layout that positions the labels
const labels = layoutLabel(strategy)
    .size((d, i, g) => {
        // measure the label and add the required padding
        const textSize = g[i].getElementsByTagName('text')[0].getBBox();
        return [textSize.width + labelPadding * 2, textSize.height + labelPadding * 2];
    })
    .position(d => projection(d.geometry.coordinates))
    .component(textLabel);

// render!
svg.datum(places.features)
     .call(labels);

var width = 700,
    height = 500;

var mouse = [0,0];

var force = d3.layout.force()
    .size([width*2, height])
    .gravity(0.05)
    .chargeDistance(30)
    .friction(0.2)
    .charge(function(d){return d.fixed?0:-1000})
    .linkDistance(5)
    .on("tick", tick);

var drag = force.drag()
    .on("dragstart", dragstart);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
    .on("click", function(){
        mouse = d3.mouse(d3.select(this).node()).map(function(d) {
            return parseInt(d);
        });
        graph.links.forEach(function(d,i){
            var rn = Math.random()*200 - 100;
            d.source.fixed = true; 
            d.source.px = mouse[0];
            d.source.py = mouse[1] + rn;
            d.target.y = mouse[1] + rn;
        })
        force.resume();

        d3.selectAll("circle").classed("fixed", function(d){ return d.fixed});
    });

var link = svg.selectAll(".link"),
    node = svg.selectAll(".node");

var graph = {
  "nodes": [
    {"x": 469, "y": 410},
    {"x": 493, "y": 364},
    {"x": 442, "y": 365},
    {"x": 467, "y": 314},
    {"x": 477, "y": 248},
    {"x": 425, "y": 207},
    {"x": 402, "y": 155},
    {"x": 369, "y": 196},
    {"x": 350, "y": 148},
    {"x": 539, "y": 222},
    {"x": 594, "y": 235},
    {"x": 582, "y": 185}
  ],
  "links": [
    {"source":  0, "target":  1},
    {"source":  2, "target":  3},
    {"source":  4, "target":  5},
    {"source":  6, "target":  7},
    {"source":  8, "target":  9},
    {"source":  10, "target":  11}
  ]
}

function tick() {
  graph.nodes.forEach(function (d) {
     if(d.fixed) return;
     if(d.xmouse[0]+50) d.x--
    })

  link.attr("x1", function(d) { return d.source.x; })
      .attr("y1", function(d) { return d.source.y; })
      .attr("x2", function(d) { return d.target.x; })
      .attr("y2", function(d) { return d.target.y; });

  node.attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
}

function dblclick(d) {
  d3.select(this).classed("fixed", d.fixed = false);
}

function dragstart(d) {
  d3.select(this).classed("fixed", d.fixed = true);
}

  force
      .nodes(graph.nodes)
      .links(graph.links)
      .start();

  link = link.data(graph.links)
    .enter().append("line")
      .attr("class", "link");

  node = node.data(graph.nodes)
    .enter().append("circle")
      .attr("class", "node")
      .attr("r", 10)
      .on("dblclick", dblclick)
      .call(drag);

.link {
  stroke: #ccc;
  stroke-width: 1.5px;
}

.node {
  cursor: move;
  fill: #ccc;
  stroke: #000;
  stroke-width: 1.5px;
  opacity: 0.5;
}

.node.fixed {
  fill: #f00;
}

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