Edit fiddle - JSFiddle - Code Playground

HTML

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<br/><!-- Just so that JSFiddle's Result label doesn't overlap the Chart -->
<div id="chartContainer">
  <div id = "ySlider" style="height: 360px; width: 2%; float: left; max-width: 15px; min-width: 10px"></div>
  <div id="chartContainer1" style="height: 360px; width: 95%;"></div>
</div>
<br/>
<div id = "xSlider" style="width: 95%; margin-left: 5px"></div>
<div id="tableContainer">
  <table id="chartData">
  </table>
</div>

JavaScript

Module

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var selectedDataPoints = [];
var axisXMin = 0, axisXMax = 0;
var axisYMin = 0, axisYMax = 0;
var initialized = false;
var chart1 = new CanvasJS.Chart("chartContainer1", {
  title: {
    text: "Select the Region to Highlight dataPoints"
  },
  zoomEnabled: true,
  zoomType: "xy",
  rangeChanged: drawLasso, //changeSelectedDataPoints, // drawLasso
  data: [{
    type: "scatter",
    markerSize: 10,
    selectedMarkColor: "red", // Marker color by which selected dataPoints will be represented
    dataPoints: dataGenerator(100),
  }]
});
​
chart1.render();
​
let isMouseDown = false;
let startPoint = null;
let previousPoint = {};
let endPoint = null;
let mouseDownTime;
let mouseUpTime;
let lassoPoints = [];
​
var canvas = document.querySelector('#chartContainer1');
// var ctx = canvas.getContext('2d');
​
// Add event listeners for mouse down, up, and move events
canvas.addEventListener('mousedown', handleMouseDown);
canvas.addEventListener('mouseup', handleMouseUp);
canvas.addEventListener('mousemove', handleMouseMove);
​
​
canvas.addEventListener('click', function(event) {
  const timeElapsed = (+mouseUpTime) - (+mouseDownTime);
  if (timeElapsed > 400) return;
​
  const canvasPoint = convertToCanvasCoordinates({
    x: event.pageX - canvas.offsetLeft,
    y: event.pageY - canvas.offsetTop
  });
  const closestPoint = findClosestPoint(canvasPoint);
  if (closestPoint) {
    //console.log(`closestPoint = ${JSON.stringify(closestPoint)}`);
    selectPoint(closestPoint);
  }
});
​
function convertToCanvasCoordinates(point) {
  return {
    x: chart1.axisX[0].convertPixelToValue(point.x),
    y: chart1.axisY[0].convertPixelToValue(point.y)
  };
}
​
function findClosestPoint(clickedPoint) {
  let smallestDistance = 999999;
  let closestPoint = null;
  const maxDistance = 100;
  const dataPoints = chart1.options.data[0].dataPoints;
  for (var i = 0; i < dataPoints.length; i++) {
    const point = dataPoints[i];
    const dx = clickedPoint.x - point.x;
    const dy = clickedPoint.y - point.y;
    const d = Math.pow(dx, 2) + Math.pow(dy, 2);
    if (d < smallestDistance && d < maxDistance) {
      smallestDistance = d;
      closestPoint = point;
    }
  }
  return closestPoint;
}
​
function selectPoint(point) {
  selectedDataPoints.push(point);
  point.markerColor = 'red';
}
​
function drawLasso(e) {
  console.log('draw lasso');
  
 // console.log(`e = ${JSON.stringify(e)}`);
  
  
  resetViewport(e);
}
​
// Function to handle mouse down event
function handleMouseDown(event) {
  mouseDownTime = new Date();
  isMouseDown = true;
  var clickPoint = {
    x: event.clientX - canvas.offsetLeft,
    y: event.clientY - canvas.offsetTop
  };
  startPoint = convertToCanvasCoordinates(clickPoint);
  console.log(`startPoint = {${startPoint.x}, ${startPoint.y}}`);
}
​
// Function to handle mouse up event
function handleMouseUp(event) {
  mouseUpTime = new Date();
  isMouseDown = false;
  var clickPoint = {
    x: event.clientX - canvas.offsetLeft,
    y: event.clientY - canvas.offsetTop
  };
  endPoint = convertToCanvasCoordinates(clickPoint);
  console.log(`endPoint = {${endPoint.x}, ${endPoint.y}}`);
}
​
// Function to handle mouse move event
function handleMouseMove(event) {
  if (isMouseDown) {
    var currentPoint = {
      x: event.clientX - canvas.offsetLeft,
      y: event.clientY - canvas.offsetTop
    };
​
   // ctx.strokeStyle = 'red';
   // ctx.lineWidth = 2;
   // ctx.moveTo(previousPoint.x, previousPoint.y);
   // ctx.lineTo(currentPoint.x, currentPoint.y);
    //ctx.stroke();
    
    lassoPoints.push(currentPoint);
​
    previousPoint = currentPoint;
  }
}
​
/*
//----- Function for indicating selected regions dataPoints marker size --------
function changeSelectedDataPoints(e) {
  var data = e.chart.options.data;
  if (!e.chart.options.axisX)
    e.chart.options.axisX = {};
​
  if (!e.chart.options.axisY)
    e.chart.options.axisY = {};
​
  var axisX = e.axisX[0];
  var axisY = e.axisY[0];
  
//  selectedDataPoints = [];
​
  for (var i = 0; i < data.length; i++) {
    var dataPoints = data[i].dataPoints;
    var selectedMarkColor = data[i].selectedMarkColor;
    for (var j = 0; j < dataPoints.length; j++) {
      if (dataPoints[j].x > axisX.viewportMinimum && dataPoints[j].x < axisX.viewportMaximum && dataPoints[j].y > axisY.viewportMinimum && dataPoints[j].y < axisY.viewportMaximum)
      {
        selectedDataPoints.push(dataPoints[j]);
        if (typeof dataPoints[j].originalMarkerSize === "undefined")            {
          dataPoints[j].selectedMarkColor = dataPoints[j].markerSize ? dataPoints[j].markerColor : "red";
        }
        dataPoints[j].markerColor = selectedMarkColor;
      }
      else if (!initialized)
      {
        dataPoints[j].markerColor = dataPoints[j].originalMarkerSize;
      }
    }
​
  }
​
  addTable(e.chart)
​
  e.chart.options.axisX[0].viewportMinimum = e.chart.options.axisX[0].viewportMaximum = null;
  e.chart.options.axisY[0].viewportMinimum = e.chart.options.axisY[0].viewportMaximum = null;
  
  e.chart.render(); //setting the zoom to null first
​
  e.chart.options.axisX[0].viewportMinimum = axisXMin;
  e.chart.options.axisX[0].viewportMaximum = axisXMax;
  e.chart.options.axisY[0].viewportMinimum = axisYMin;
  e.chart.options.axisY[0].viewportMaximum = axisYMax;
  
  e.chart.render(); //setting the previous zoom region (workaround for the behaviour)
  
  if(e.trigger === "reset") {
    removeTable(e.chart);
  }
  
  initialized = true;
  
  console.log(selectedDataPoints);
  
}
*/
​
function resetViewport(e) {
  e.chart.options.axisX[0].viewportMinimum = e.chart.options.axisX[0].viewportMaximum = null;
  e.chart.options.axisY[0].viewportMinimum = e.chart.options.axisY[0].viewportMaximum = null;
  
  e.chart.render(); //setting the zoom to null first
​
  e.chart.options.axisX[0].viewportMinimum = axisXMin;
  e.chart.options.axisX[0].viewportMaximum = axisXMax;
  e.chart.options.axisY[0].viewportMinimum = axisYMin;
  e.chart.options.axisY[0].viewportMaximum = axisYMax;
  
  e.chart.render(); //setting the previous zoom region (workaround for the behaviour)
}
​
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;
}
​
function addTable(chart){
  var tableData = "<tr> <td> X-value </td> <td> Y-value </td> </tr>";
  $('#chartData').empty()
  
​
  for(var j = 0; j < selectedDataPoints.length; j++){
    tableData += "<tr>" + "<td>" + selectedDataPoints[j].x + "</td>";
    tableData += ("<td>" + selectedDataPoints[j].y +"</td>")
    tableData += "</tr>";
  }
  $("#chartData").append(tableData);
  
}
​
​
function removeTable(chart) {
  $('#chartData').empty()
  selectedDataPoints = [];
}
​
$("#xSlider").slider({
  range: true,
  min: chart1.axisX[0].get("minimum"),
  max: chart1.axisX[0].get("maximum"),
  values: [ chart1.axisX[0].get("minimum"), chart1.axisX[0].get("maximum") ], //Defalt zoom state
  slide: function( event, ui ) {
    chart1.axisX[0].set("viewportMinimum", ui.values[0], false);
    chart1.axisX[0].set("viewportMaximum", ui.values[1]);
    axisXMin = ui.values[0];
    axisXMax = ui.values[1];
  }
});
​
$("#ySlider").slider({
  range: true,
  orientation: "vertical",
  min: chart1.axisY[0].get("minimum"),
  max: chart1.axisY[0].get("maximum"),
  values: [ chart1.axisY[0].get("minimum"), chart1.axisY[0].get("maximum") ], //Defalt zoom state
  slide: function( event, ui ) {
    chart1.axisY[0].set("viewportMinimum", ui.values[0], false);
    chart1.axisY[0].set("viewportMaximum", ui.values[1]);
    axisYMin = ui.values[0];
    axisYMax = ui.values[1];
  }
});
​
chart1.axisY[0].set("viewportMinimum", $("#ySlider").slider("values", 0), false);
chart1.axisY[0].set("viewportMaximum", $("#ySlider").slider("values", 1));
​
chart1.axisX[0].set("viewportMinimum", $("#xSlider").slider("values", 0), false);
chart1.axisX[0].set("viewportMaximum", $("#xSlider").slider("values", 1));

CSS

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.canvasjs-chart-toolbar> button:first-child {
  display: none !important;
}
​
#chartData{
  border: 1px solid black;
}
td{
  border: 1px solid black;
  width: 7%;
}

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