JSFiddle - React, Tailwind, and code Playground

HTML

<canvas id="drawing" width="800px" height="500px"></canvas>

JavaScript

var data_array = [];
var num_vertices = [];

function draw(position) {
    var canvas_elem = document.getElementById('drawing');

    // Check the element is in the DOM and the browser supports canvas
    if(canvas_elem.getContext)
    {
        // Initaliase a 2-dimensional drawing context
        var canvas = canvas_elem.getContext('2d');

        // Clear canvas
        canvas.clearRect(0, 0, canvas_elem.width, canvas_elem.height);

        var data = data_array[num_vertices+1+position].split(",");

        // Draw all vertices
        for( var i=0; i<num_vertices; i++)
        {
            canvas.arc(data[2*i], data[2*i+1], radius, 0, 2 * Math.PI, false);
            canvas.fillStyle = 'black';
            canvas.fill();
        }

        // Connect vertices by lines according to adjacency matrix
        for(var i=0;i<num_vertices; i++)
        {
            for(var j=i; j<num_vertices; j++)
            {
                if(adjacency[i][j]==1)
                {
                    canvas.beginPath();
                    canvas.moveTo(data[2*i],data[2*i+1]);
                    canvas.lineTo(data[2*j],data[2*j+1]);
                    canvas.stroke();
                }
            }
        }
    }
    else
    {
        alert("Please use an HTML5 compatible browser.");
    }
}

draw();