Draggable bubble chart - CanvasJS JavaScript Charts

Draggable bubble chart - CanvasJS JavaScript Charts

by canvasjs

HTML

<script src="https://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",{        
  axisX:{
    minimum: 5,
    maximum: 95
  },
  title: {
    text: "Try dragging column to reposition dataPoint",
  },
  data: [
    {
      type: "bubble",
      dataPoints: [
        { x: 10, y: 71, z: 1 },
        { x: 20, y: 55, z: 2 },
        { x: 30, y: 50, z: 3 },
        { x: 40, y: 65, z: 2 },
        { x: 50, y: 95, z: 1 },
        { x: 60, y: 68, z: 4 },
        { x: 70, y: 28, z: 3 },
        { x: 80, y: 34, z: 2 },
        { x: 90, y: 14, z: 1 }
      ]
    }                   
  ]
});

chart.render();

var xSnapDistance = 5;
var ySnapDistance = 3;

var xValue, yValue;

var mouseDown = false;
var selected = null;
var changeCursor = false;

var timerId = null;

function getPosition(e) {
  var parentOffset = $("#chartContainer > .canvasjs-chart-container").offset();          	
  var relX = e.pageX - parentOffset.left;
  var relY = e.pageY - parentOffset.top;
  xValue = Math.round(chart.axisX[0].convertPixelToValue(relX));
  yValue = Math.round(chart.axisY[0].convertPixelToValue(relY));
}

function searchDataPoint() {
  var dps = chart.data[0].dataPoints;
  for(var i = 0; i < dps.length; i++ ) {
    if( (xValue >= dps[i].x - xSnapDistance && xValue <= dps[i].x + xSnapDistance) && 
       (yValue >= dps[i].y - ySnapDistance && yValue <= dps[i].y + ySnapDistance) ) {
      if(mouseDown) {
        selected = i;
        break;
      }
      else {
        changeCursor = true;
        break; 
      }
    } else {
      selected = null;
      changeCursor = false;
    }
  }

}

jQuery("#chartContainer > .canvasjs-chart-container").on({
  mousedown: function(e) {
    mouseDown = true;
    getPosition(e);  
    searchDataPoint();
  },
  mousemove: function(e) {
    getPosition(e);
    if(mouseDown) {
      clearTimeout(timerId);
      timerId = setTimeout(function(){
        if(selected != null) {
          chart.data[0].dataPoints[selected].y = yValue;
          chart.render();
        }   
      },...