fengshuo · November 27, 2016 18:45
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <meta charset="utf-8">
 <style>
 rect{
  fill: white;
 }
 circle {
  stroke: #000;
  stroke-opacity: .5;
 }
 </style>
 <body>
 <script src="//d3js.org/d3.v3.min.js"></script>
 <script>
 var width = 1200,
    height = 500;
 var nodes = d3.range(8).map(function(i) {
  return {
     type: Math.random() * 8 | 0,
     radius: 30,
     fixed: true,
     type: i,
     x: (i + 1) * (width / 9),
     y: height / 2
   };
 });
  
 var logo = ["T","E","R","A","P","E","A","K"];
 var color = d3.scale.category10();
 var force = d3.layout.force()
    .gravity(0)
    .charge(0)
    .nodes(nodes)
    .size([width, height])
    .on("tick", ticked);
 var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
    .on("mousemove", mousemoved);
 svg.append("rect")
    .attr("width", width)
    .attr("height", height);
 svg.selectAll("circle")
    .data(logo)
  .enter().append("text")
 	.attr("x",function(d,i){return (i + 1) * (width / 9)} )
  .attr("y",function(d,i){return height / 2})
  .text(function(d){return d})
  .style("fill", function(d,i){return color(i)})
  .style("font-size", "24px")
 //     .attr("r", function(d) { return d.radius - 2; })
 //     .style("fill", function(d) { return color(d.type); });
 var p0;
 force.start();
 function mousemoved() {
  var p1 = d3.mouse(this);
  p0 = p1;
  var node = {
    radius: Math.random() * 12 + 4,
    type: Math.random() * 8 | 0,
    x: p1[0],
    y: p1[1],
    px: (p0 || (p0 = p1))[0],
    py: p0[1]
  };
  svg.append("circle")
      .data([node])
      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; })
      .attr("r", function(d) { return d.radius - 2; })
      .style("fill", function(d) { return color(d.type); })
    .transition()
      .delay(3000)
      .attr("r", 1e-6)
      .each("end", function() { nodes.splice(9, 1); })
      .remove();
  nodes.push(node);
  force.resume();
 }
 function ticked(e) {
  var q = d3.geom.quadtree(nodes),
      k = e.alpha * 0.1,
      i = 0,
      n = nodes.length,
      o;
  while (++i < n) {
    o = nodes[i];
    if (o.fixed) continue;
    c = nodes[o.type];
    o.x += (c.x - o.x) * k;
    o.y += (c.y - o.y) * k;
    q.visit(collide(o));
  }
  svg.selectAll("circle")
      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
 }
 function collide(node) {
  var r = node.radius + 16,
      nx1 = node.x - r,
      nx2 = node.x + r,
      ny1 = node.y - r,
      ny2 = node.y + r;
  return function(quad, x1, y1, x2, y2) {
    if (quad.point && (quad.point !== node)) {
      var x = node.x - quad.point.x,
          y = node.y - quad.point.y,
          l = Math.sqrt(x * x + y * y),
          r = node.radius + quad.point.radius;
      if (l < r) {
        l = (l - r) / l * .5;
        node.px += x * l;
        node.py += y * l;
      }
    }
    return x1 > nx2
        || x2 < nx1
        || y1 > ny2
        || y2 < ny1;
  };
 }
 </script>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>
	rect{
	fill: white;
	}
	circle {
	stroke: #000;
	stroke-opacity: .5;
	}
	</style>
	<body>
	<script src="//d3js.org/d3.v3.min.js"></script>
	<script>
	var width = 1200,
	height = 500;
	var nodes = d3.range(8).map(function(i) {
	return {
	type: Math.random() * 8 \| 0,
	radius: 30,
	fixed: true,
	type: i,
	x: (i + 1) * (width / 9),
	y: height / 2
	};
	});

	var logo = ["T","E","R","A","P","E","A","K"];
	var color = d3.scale.category10();
	var force = d3.layout.force()
	.gravity(0)
	.charge(0)
	.nodes(nodes)
	.size([width, height])
	.on("tick", ticked);
	var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height)
	.on("mousemove", mousemoved);
	svg.append("rect")
	.attr("width", width)
	.attr("height", height);
	svg.selectAll("circle")
	.data(logo)
	.enter().append("text")
	.attr("x",function(d,i){return (i + 1) * (width / 9)} )
	.attr("y",function(d,i){return height / 2})
	.text(function(d){return d})
	.style("fill", function(d,i){return color(i)})
	.style("font-size", "24px")
	// .attr("r", function(d) { return d.radius - 2; })
	// .style("fill", function(d) { return color(d.type); });
	var p0;
	force.start();
	function mousemoved() {
	var p1 = d3.mouse(this);
	p0 = p1;
	var node = {
	radius: Math.random() * 12 + 4,
	type: Math.random() * 8 \| 0,
	x: p1[0],
	y: p1[1],
	px: (p0 \|\| (p0 = p1))[0],
	py: p0[1]
	};
	svg.append("circle")
	.data([node])
	.attr("cx", function(d) { return d.x; })
	.attr("cy", function(d) { return d.y; })
	.attr("r", function(d) { return d.radius - 2; })
	.style("fill", function(d) { return color(d.type); })
	.transition()
	.delay(3000)
	.attr("r", 1e-6)
	.each("end", function() { nodes.splice(9, 1); })
	.remove();
	nodes.push(node);
	force.resume();
	}
	function ticked(e) {
	var q = d3.geom.quadtree(nodes),
	k = e.alpha * 0.1,
	i = 0,
	n = nodes.length,
	o;
	while (++i < n) {
	o = nodes[i];
	if (o.fixed) continue;
	c = nodes[o.type];
	o.x += (c.x - o.x) * k;
	o.y += (c.y - o.y) * k;
	q.visit(collide(o));
	}
	svg.selectAll("circle")
	.attr("cx", function(d) { return d.x; })
	.attr("cy", function(d) { return d.y; });
	}
	function collide(node) {
	var r = node.radius + 16,
	nx1 = node.x - r,
	nx2 = node.x + r,
	ny1 = node.y - r,
	ny2 = node.y + r;
	return function(quad, x1, y1, x2, y2) {
	if (quad.point && (quad.point !== node)) {
	var x = node.x - quad.point.x,
	y = node.y - quad.point.y,
	l = Math.sqrt(x * x + y * y),
	r = node.radius + quad.point.radius;
	if (l < r) {
	l = (l - r) / l * .5;
	node.px += x * l;
	node.py += y * l;
	}
	}
	return x1 > nx2
	\|\| x2 < nx1
	\|\| y1 > ny2
	\|\| y2 < ny1;
	};
	}
	</script>