New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  tileId: 'wac_12758',
  tileHeight: 2944,
  tileSubdomains: ['', '0', '1', '2'],
  tileWidth: 4000,
  
  tileUrl: Ember.computed('tileId', function() {
    return `http://cdn{s}.walkerart.org/public/collections-tiled/${this.get('tileId')}/{z}_{x}_{y}.jpg`;
  }),
  
  tileBounds: Ember.computed('tileHeight', 'tileWidth', function() {
    let p1 = L.latLng(0, this.get('tileHeight'));
    let p2 = L.latLng(this.get('tileWidth'), 0);
    return L.latLngBounds(p1, p2);
  })
});

templates.application.hbs

<ul>
	<li>width: {{tileWidth}}</li>
	<li>height: {{tileHeight}}</li>
  <li>tileId: {{tileId}}</li>
</ul>
{{#leaflet-map lat="0" lng="0" zoom="2" as |layers|}}
  {{layers.tile
    url=tileUrl
    noWrap=true
    subdomains=tileSubdomains
    continuousWorld=false
    tms=false
    detectRetina=false
    unloadInvisibleTiles=false
    reuseTiles=true
    updateWhenIdle=false
    minZoom=1
    maxZoom=3
    bounds=tileBounds
  }}
{{/leaflet-map}}

twiddle.json

{
  "version": "0.10.7",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.0",
    "ember-data": "2.10.0",
    "ember-template-compiler": "2.10.0",
    "ember-testing": "2.10.0"
  },
  "addons": {
  	"ember-leaflet": "3.0.7"
  }
}