I Make Circles

forked from mbostock's block: I Make Circles

<!DOCTYPE html>
<style>

button {
  position: absolute;
  top: 10px;
  left: 10px;
}

circle {
  fill: none;
  stroke: #000;
  stroke-width: 1.5px;
}

</style>
<button>Click Me</button>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

var svg = d3.select("svg"),
    margin = {top: 30, right: 30, bottom: 30, left: 30},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var x = d3.scaleTime()
    .range([0, width]);

var xAxis = d3.axisBottom(x);

var xAxisG = g.append("g")
    .attr("transform", "translate(0, " + height + ")");

d3.timer(function() {
  var now = Date.now();
  x.domain([now - 5000, now]);
  xAxisG.call(xAxis);
});

d3.select("button").on("click", function() {
  var time = Date.now();

var circle = g.append("circle")
      .attr("r", 80)
      .attr("stroke-opacity", 0)
      .attr("cy", Math.random() * height);

circle.transition("time")
      .duration(5000)
      .ease(d3.easeLinear)
      .attrTween("cx", function(d) { return function(t) { return x(time); }; })

circle.transition()
      .duration(750)
      .ease(d3.easeCubicOut)
      .attr("r", 3.5)
      .attr("stroke-opacity", 1)
    .transition()
      .delay(5000 - 750 * 2)
      .ease(d3.easeCubicIn)
      .attr("r", 80)
      .attr("stroke-opacity", 0)
      .remove();
});

</script>

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