Multi Series Draggable Column Chart - CanvasJS JavaScript Chart

Multi Series Draggable Column Chart - CanvasJS JavaScript Chart

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: 300px; width: 100%;"></div>

JavaScript

var chart = new CanvasJS.Chart("chartContainer", {  
  title: {
    text: "Try dragging column to reposition dataPoint",
  },
  axisX:{
    minimum: 5,
    maximum: 95
  },
  data: [
    {
      type: "column",
      dataPoints: [
        { x: 10, y: 71 },
        { x: 20, y: 55 },
        { x: 30, y: 50 },
        { x: 40, y: 65 },
        { x: 50, y: 95 },
        { x: 60, y: 68 },
        { x: 70, y: 28 },
        { x: 80, y: 34 },
        { x: 90, y: 14 }
      ]
    }, {
      type: "column",
      dataPoints: [
        { x: 10, y: 78 },
        { x: 20, y: 42 },
        { x: 30, y: 86 },
        { x: 40, y: 25 },
        { x: 50, y: 78 },
        { x: 60, y: 96 },
        { x: 70, y: 36 },
        { x: 80, y: 45 },
        { x: 90, y: 20 }
      ]
    }                     
  ]
});

chart.render();

var xSnapDistance = chart.axisX[0].convertPixelToValue(chart.get("dataPointWidth")) / 2;
var ySnapDistance = (chart.axisY[0].get("maximum") - chart.axisY[0].get("minimum"))/chart.axisY[0].get("interval");

var xValue, yValue, index, ind;

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(e) {

  var dataInfo = chart.getDataPointAtXY(e.clientX, e.clientY);
  if(dataInfo)
    index = dataInfo.dataSeries.index;
  else
    index = 0;
  var dps = chart.data[index].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...