kodi

var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var width = 700;
var height = 700;
var center = {x: width/2 , y: height/2};

var circleStroke = function(radius, x, y, strokeColor) {
    ctx.strokeStyle = strokeColor;
    ctx.beginPath();
    ctx.arc(x, y, radius, 0, Math.PI * 2);

kodi

    var canvas = document.getElementById('canvas');
    var ctx = canvas.getContext('2d');

    canvas.addEventListener("mousemove", function (e) {
        findxy('move', e)
    }, false);
    canvas.addEventListener("mousedown", function (e) {
        findxy('down', e)
    }, false);
    canvas.addEventListener("mouseup", function (e) {

kodi

Install the following requirements:

brew info zeromq
npm install zmq
npm install socket.io
gem install ffi-rzmq

Within the app directory run the following commands in different panes.

ruby worker.rb