KineticJS Stage Resizing

How to autosize a KineticJS stage.

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/kineticjs/5.0.6/kinetic.js"></script>
<div id="stage-container">stage goes here!
</div>

CSS

body { background-color: black; color: white; }
#stage-container { background-color: #009900; }

JavaScript

var iPadLandscapeDimensions = {
  width: 1024,
  height: 768
};

var KineticScreenAutoSize = (function() {
  var self = {
    $container: null,
    stage: null,
    baseWidth: 0,
    baseHeight: 0,
    initWidth: 0,
    initHeight: 0
  };

  var init = function(selector, baseWidth, baseHeight) {
    self.$container = $(selector);
    self.baseWidth = baseWidth;
    self.baseHeight = baseHeight;
    initStage();
  };

  var initStage = function($container) {
    self.stage = new Kinetic.Stage({
      container: self.$container.attr('id'),
      width: self.baseWidth,
      height: self.baseHeight
    });
  };

  /*
   * Screen-Sizing Methods
   */
  var autoSize = function() {  
    // Style required for resizeScreen below
    self.$container.css({
      position: 'absolute',
      left: '50%',
      top: '50%',
      width: '100%',
      height: '100%'
    });

    // Resize automatically
    window.addEventListener('resize', resizeStageToFitScreen, false);
    window.addEventListener('orientationchange', resizeStageToFitScreen, false);

    // Resize
    resized = resizeStageToFitScreen();
  };

  var resizeStageToFitScreen = function() {
    /*
     * Following directions here: http://stackoverflow.com/a/19645405/1093087
     */
    var resized = calculateResize();

    // Resize the kinetic container element proportionally
    resized.cssSettings = {
      left: resized.xToCenter + 'px',
      top: resized.yToCenter + 'px',
      width: resized.width,
      height: resized.height,
    }
    self.$container.css(resized.cssSettings);

    // Let Kinetic know its container is resizing with .setWidth and .setHeight
    self.stage.setSize(resized);

    // Use .setScaleX and setScaleY followed by stage.draw to scale the stage
    // and all its components.
    self.stage.scaleX(resized.xScale);
    self.stage.scaleY(resized.yScale);

    self.stage.draw();
    return resized;
  };

  var calculateResize = function() {
    var resized = {
      width: 0,
     ...