Particles

forked from danielandrukonis's block: fresh block

<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
  margin: 0;
  background: #222;
  min-width: 960px;
}
rect {
  fill: none;
  pointer-events: all;
}
circle {
  fill: none;
  stroke-width: 2.5px;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
var width = Math.max(960, innerWidth),
    height = Math.max(500, innerHeight);
var i = 0;
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
svg.append("rect")
    .attr("width", width)
    .attr("height", height)
    .on("ontouchstart" in document ? "touchmove" : "mousemove", particle);
function particle() {
  var m = d3.mouse(this);
  svg.insert("circle", "rect")
      .attr("cx", m[0])
      .attr("cy", m[1])
      .attr("r", 1e-6)
      .style("stroke", d3.hsl((i = (i + 1) % 360), 1, .5))
      .style("stroke-opacity", 1)
    .transition()
      .duration(2000)
      .ease(Math.sqrt)
      .attr("r", 100)
      .style("stroke-opacity", 1e-6)
      .remove();
  d3.event.preventDefault();
}
</script>
Raw

https://d3js.org/d3.v3.min.js