D3 Examples - Animating Circles (React & SVG)

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
  font-family: Helvetica, sans-serif;
}
svg {
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
}
.filter-btn.active {
  font-weight: bold;
}
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="d3-grid.js"></script>
<script src="https://fb.me/react-0.12.2.min.js"></script>
<script src="https://fb.me/jsxtransformer-0.12.2.js"></script>
<script type="text/jsx;harmony=true">
​
var width = 960,
    height = 960
    TAU = Math.PI * 2;
​
var grid = d3.layout.grid()
  .size([width, height]);
​
var color = d3.scale.linear()
  .interpolate(d3.interpolateHcl)
  .domain([0, 100])
  .range(["#F66A96", "#3E6E9C"]);
​
var data = d3.range(5000).map(function(d) { 
  return {
    id: d,
    size: 1 + Math.floor(Math.random() * 5),
    r: Math.random() * 50,
    color: Math.floor(Math.random() * 100),
    f: (Math.random() > 0.5 ? -1 : 1) * (Math.random() * 10000 + 1000)
  }; 
});
​
var Svg = React.createClass({
  getInitialState() {
    return {
      t: 0
    }
  },
​
  update(t) {
    this.setState({t});
  },
​
  componentDidMount() {
    d3.timer(this.update);
  },
​
  render() {
    return <svg width={this.props.width} height={this.props.height}>
      {this.props.data.map((d) => {
        var alpha = TAU / d.f * (this.state.t % d.f);
        return <circle transform={"translate(" + (d.x + Math.cos(alpha) * d.r) + "," + (d.y + Math.sin(alpha) * d.r) + ")"} fill={color(d.color)} r={d.size} key={d.id} />
      })}
    </svg>;
  }
})
​
React.render(<Svg width={width} height={height} data={grid(data)} />, document.body);
​
d3.select(self.frameElement).style("height", height + "px");
​
</script>
    