Use tracking.js on node.js

Question

I'm trying to do some color tracking on images with node.js. I found tracking.js to be quite suitable for the job. I've got the problem solved in the browser. As i tried to move things over to node.js, i realised that tracking.js depends on DOM elements to convert images to matrices, etc.

My usecase looks similar to this (from the tracking.js examples):

window.onload = function() {
  var img = document.getElementById('img');
  var demoContainer = document.querySelector('.demo-container');

  var tracker = new tracking.ColorTracker(['magenta', 'cyan', 'yellow']);

  tracker.on('track', function(event) {
    event.data.forEach(function(rect) {
      window.plot(rect.x, rect.y, rect.width, rect.height, rect.color);
    });
  });

  tracking.track('#img', tracker);

  window.plot = function(x, y, w, h, color) {
    console.log('found ',color,' at ',x,y,w,h) // these results would be used in node.js
    var rect = document.createElement('div');
    document.getElementById('bdy').appendChild(rect);
    rect.classList.add('rect');
    rect.style.border = '2px solid ' + color;
    rect.style.width = w + 'px';
    rect.style.height = h + 'px';
    rect.style.left = (img.offsetLeft + x) + 'px';
    rect.style.top = (img.offsetTop + y) + 'px';
  };
};

As I understand they present a gulp test that works in the repo, but i can't find a proper module anywhere.

Is there an elegant alternative way to make tracking.js run on node.js?

Answer 1

The latest commit has absolved this problem (from issue #47).