Changing area marker size on hover

HTML

<script src="http://canvasjs.com/assets/script/canvasjs.min.js"></script>
<br/><!-- Just so that JSFiddle's Result label doesn't overlap the Chart -->
<div id="chartContainer" style="height: 360px; width: 100%;"></div>

JavaScript

var chart = new CanvasJS.Chart("chartContainer", {
  data: [{
    type: "splineArea",
    markerSize: 0,
    hoveredMarkerSize: 30, // Marker size by which hovered dataPoints will be represented
    dataPoints: dataGenerator(100),
    mouseover(event) {
      event.dataPoint.markerSize = event.dataSeries.hoveredMarkerSize;
      event.chart.render();
    },
    mouseout(event) {
      delete event.dataPoint.markerSize;
      event.chart.render();
    }
  }]
});

chart.render();


function dataGenerator(limit) {
  var y = 100;
  var points = [];
  for (var i = 0; i < limit; i += 1) {
    y += (Math.random() * 100 - 50);
    points.push({
      x: i - limit / 2,
      y: y
    });
  }
  return points;
}