Draggable Scatter Chart with Data from CSV - CanvasJS Javascript Charts

Draggable Scatter Chart with Data from CSV - CanvasJS Javascript Charts

by canvasjs

HTML

<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<div id="chartContainer" style="height: 340px; width: 100%;"></div>
<span id="displayCoordinates"></span>

JavaScript

var dataPoints = [];
$.get("https://codepen.io/anon/pen/LBGgOP.js", function(data) {
  getDataPointsFromCSV(data);
  chart.render();
});

function getDataPointsFromCSV(csv) {		
  var allLinesArray = csv.split("\n");
  if( allLinesArray.length > 0 ){
    for (var i = 0; i <= allLinesArray.length-1; i++) {
      var rowData = allLinesArray[i].split(",");
      dataPoints.push({ x: parseInt(rowData[0]), y: parseInt(rowData[1]) });
    }
  }   
}

var chart = new CanvasJS.Chart("chartContainer",{
  axisX:{
    minimum: 5,
    maximum: 95
  },
  title: {
    text: "Draggable Scatter Graph",
  },
  data: [
    {
      type: "scatter",
      dataPoints: dataPoints
    }
  ]
});

chart.render();

var xSnapDistance = 1;
var ySnapDistance = 1;

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;
  var len = dps.length;

  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) {
   ...