d3 on click on circle pause and resume transition of marker along line

I would like help to correct my code to click the marker circle element to pause or resume transition of this element along the line. My code moves marker along a line and I can pause and resume this transition using on click on button element but I would like to be able to click on the marker circle itself, not the button. I have used various references including : http://www.nytimes.com/interactive/2013/09/25/sports/americas-cup-course.html http://jsfiddle.net/meetamit/UJuWX/3/ http://jsfiddle.net/Y62Hq/2/ D3 tween - pause and resume controls

I would ultimately like to be able animate a marker along a geo path, pause and resume this at points along the path and click through on these points.

this is my code so far:

<!DOCTYPE html>
<html lang="en">
    <head>
<meta charset="utf-8">
<title>Need help</title>

<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-array.v1.min.js"></script>
<script src="https://d3js.org/d3-geo.v1.min.js"></script>
<script src="https://d3js.org/d3-queue.v3.min.js"></script>

<style type="text/css">

body{
    font-family:"Helvetica Neue", Helvetica, sans-serif;
    color: red;
}
button {
  position: absolute;
  top: 15px;
  left: 10px;
  background: #004276;
  padding-right: 26px;
  border-radius: 2px;
  cursor: pointer;
}
circle {
  fill: steelblue;
  stroke: pink;
  stroke-width: 3px;
}
.point{
    fill:green;

}
.line{
  fill: none;
  stroke: red;
  stroke-width: 4;
  stroke-dasharray: 4px,8px;
}
</style>
</head>
<body>

<button>Start</button>

<script>

    var w = 960,
        h = 500;

    var duration = 10000;

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

    var line = d3.line()
    .x(function(d){return (d)[0];})
    .y(function(d){return (d)[1];});

var data =
 [
  [480, 200],
  [580, 400],
  [680, 100],
  [780, 300],
  [180, 300],
  [280, 100],
  [380, 400]
];

//path to animate
var linepath = svg.append("path")
  .data([data])
  .attr("d", line)
    .attr('class', 'line')
    .attr("d", function(d){
        console.log(this);
        return line(d)
    });

var points = svg.selectAll("circle")
      .data(data)
        .enter()
        .append("circle")
      .attr("r", 7)
        .attr("transform", function(d) { return "translate(" + (d) + ")"; })
        .attr("class", "point");

var pauseValues = {
        lastTime: 0,
        currentTime: 0
        };
        var marker = svg.append("circle")
          .attr("r", 19)
          .attr("transform", "translate(" + (data[0]) + ")")
            .on('click', function(d,i){
                d3.select(this)
                .style("fill", "orange")
                .transition()
            });

function transition() {
  marker.transition()
        .duration(duration - (duration * pauseValues.lastTime))
        .attrTween("transform", translateAlong(linepath.node()))
        .on("end", function(){
        pauseValues = {
          lastT: 0,
          currentT: 0
        };
        transition()
      });
}

function translateAlong(path) {
  var l = path.getTotalLength();
  return function(d, i, a) {
    return function(t) {
      t += pauseValues.lastTime;
      var p = path.getPointAtLength(t * l);
      pauseValues.currentTime = t;
      return "translate(" + p.x + "," + p.y + ")";
    };
  };
}

d3.select('button').on('click',function(d,i){
  var self = d3.select(this);
  if (self.text() == "Pause"){
        self.text('Start');
        marker.transition()
      .duration(0);
        setTimeout(function(){
            pauseValues.lastTime = pauseValues.currentTime;
        }, 100);
  }else{
    self.text('Pause');
    transition();
  }
});

</script>
</body>
</html>