Flexible node link layout

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Homework 2 GitHub Network Graphs</title>
<style>

.link {
  stroke: gray;
  stroke-width: 1.5px;
}

.node {
  fill: #66CC66;
  stroke: #000;
  stroke-width: 1px;
}

.node:hover {
  fill: red;
}

</style>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>

<form>
  Layout:
    <label><input type="radio" name="layout" value="force" checked> Force</label>
    <label><input type="radio" name="layout" value="random" > Random</label>
    <label><input type="radio" name="layout" value="radial"> Radial</label>  
    <label><input type="radio" name="layout" value="line"> Line</label>
    <label><input type="radio" name="layout" value="line_cat"> Line by Category</label>
  </form>

<form>
  Color:
    <label><input type="radio" name="color" value="nocolor" checked> None</label>
    <label><input type="radio" name="color" value="color_cat" > Category</label>
  </form>

<form>
  Size:
    <label><input type="radio" name="size" value="nosize" checked> None</label>
    <label><input type="radio" name="size" value="size_cat" > Category</label>
  </form>
<script>

var width = 900,
    height = 700;

var svg = d3.select("body").append("svg")
            .attr("width", width)
            .attr("height", height);

var link = svg.selectAll(".link"),
    node = svg.selectAll(".node"),
    fill = d3.scaleOrdinal(d3.schemeCategory20);

var simulation;
  
// Init graph data structure
var graph = {nodes:[], links:[]};

// Generate random nodes 
var nb_nodes = 100, nb_cat = 10;

graph.nodes = d3.range(nb_nodes).map(function() {  
  return {cat: Math.floor(nb_cat * Math.random())}; 
})

graph.nodes.map(function(d, i) {

graph.nodes.map(function(e, j) {
    if(Math.random()>.99 && i!=j)
      graph.links.push({"source": i, "target": j})

});
});

function random_layout() {
  
  simulation.stop();

graph.nodes.forEach(function(d, i) {
    d.x = width/4 + 2*width*Math.random()/4;
    d.y = height/4 + 2*height*Math.random()/4;
  })
  
  graph_update(500);
}
  
function force_layout() {

simulation = d3.forceSimulation(graph.nodes)
      .force("link", d3.forceLink(graph.links).id(d => d.index))
      .force("charge", d3.forceManyBody())
      .force("center", d3.forceCenter(width / 2, height / 2));

simulation.on("tick", function() {
		graph_update(0)
  });

}

function line_layout() {

simulation.stop();

graph.nodes.forEach(function(d, i) {
    d.y = height/3;
  })

graph_update(500);
}

function line_cat_layout() {

simulation.stop();

graph.nodes.forEach(function(d, i) {
    d.y = height/3 + d.cat * 20;
  })

graph_update(500);
}

function radial_layout() {

simulation.stop();

var r = height/3;

var arc = d3.arc()
          .outerRadius(r);

var pie = d3.pie()
  .sort(function(a, b) { return a.cat - b.cat;})
          .value(function(d, i) { return 1; }); // equal share for each point

graph.nodes = pie(graph.nodes).map(function(d, i) {
    d.innerRadius = 0;
    d.outerRadius = r;
    d.data.x = arc.centroid(d)[0]+height/3;
    d.data.y = arc.centroid(d)[1]+width/3;
    d.data.endAngle = d.endAngle; 
    d.data.startAngle = d.startAngle; 
    return d.data;
  })

graph_update(500);
}

function category_color() {
  d3.selectAll("circle")
    .transition().duration(500)
    .style("fill", function(d) { return fill(d.cat); });
}

function category_size() {
  d3.selectAll("circle")
    .transition().duration(500)
    .attr("r", function(d) { return Math.sqrt((d.cat+1)*10); });
}

function graph_update(delay) {

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

node.transition().duration(delay)
    .attr("transform", function(d) { 
      return "translate("+d.x+","+d.y+")"; 
  });

}

d3.select("input[value=\"force\"]").on("click", force_layout);
d3.select("input[value=\"random\"]").on("click", random_layout);
d3.select("input[value=\"line\"]").on("click", line_layout);
d3.select("input[value=\"line_cat\"]").on("click", line_cat_layout);
d3.select("input[value=\"radial\"]").on("click", radial_layout);

d3.select("input[value=\"nocolor\"]").on("click", function() {
  d3.selectAll("circle").transition().duration(500).style("fill", "#66CC66");
})
d3.select("input[value=\"color_cat\"]").on("click", category_color);

d3.select("input[value=\"nosize\"]").on("click", function() {
  d3.selectAll("circle").transition().duration(500).attr("r", 5);
})
d3.select("input[value=\"size_cat\"]").on("click", category_size);

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

node = node.data(graph.nodes)
  .enter().append("g").attr("class", "node");

node.append("circle")
  .attr("r", 5)

force_layout();

</script>

</body>
</html>

https://d3js.org/d3.v4.min.js