Add support to view other attributions

package.json

@@ -88,6 +88,7 @@
     "lodash.throttle": "^4.0.0",
     "lru-cache": "^4.0.0",
     "reqwest": "^2.0.5",
+    "shortid": "^2.2.6",
     "three": "^0.74.0",
     "topojson": "^1.6.24",
     "xhr2": "^0.1.3"

src/World.js

@@ -49,14 +49,22 @@ class World extends EventEmitter {
   }
 
   _initAttribution() {
-    var message = '<a href="http://vizicities.com" target="_blank">Powered by ViziCities</a>';
+    var message = '<a href="http://vizicities.com" target="_blank">ViziCities</a> | <a id="show-attr" href="#">Attribution</a>';
 
     var element = document.createElement('div');
     element.classList.add('vizicities-attribution');
 
+    var additionalElem = document.createElement('div');
+    additionalElem.id = 'attribution-container';
+
     element.innerHTML = message;
+    element.appendChild(additionalElem);
 
     this._container.appendChild(element);
+
+    document.getElementById('show-attr').addEventListener('click', function(e) {
+      e.currentTarget.parentNode.classList.toggle('is-visible');
+    });
   }
 
   _initEngine() {
@@ -133,6 +141,21 @@ class World extends EventEmitter {
     this.emit('postUpdate', delta);
   }
 
+  _addAttribution(id, message) {
+    var container = document.getElementById('attribution-container');
+
+    var span = document.createElement('p');
+    span.dataset.layer = id;
+    span.innerHTML = message;
+
+    container.appendChild(span);
+  }
+
+  _removeAttribution(id) {
+    var elem = document.querySelectorAll('#attribution-container [data-layer="' + id + '"]')[0];
+    elem.remove();
+  }
+
   // Set world view
   setView(latlon) {
     // Store initial geographic coordinate for the [0,0,0] world position
@@ -230,6 +253,9 @@ class World extends EventEmitter {
 
     return new Promise((resolve, reject) => {
       layer._addToWorld(this).then(() => {
+        if (layer._options.attribution) {
+          this._addAttribution(layer._options.id, layer._options.attribution);
+        }
         this.emit('layerAdded', layer);
         resolve(this);
       }).catch(reject);

src/layer/Layer.js

@@ -1,5 +1,6 @@
 import EventEmitter from 'eventemitter3';
 import extend from 'lodash.assign';
+import shortid from 'shortid';
 import THREE from 'three';
 import Scene from '../engine/Scene';
 import {CSS3DObject} from '../vendor/CSS3DRenderer';
@@ -23,6 +24,7 @@ class Layer extends EventEmitter {
     super();
 
     var defaults = {
+      id: shortid.generate(),
       output: true,
       outputToScene: true
     };

src/vizicities.css

@@ -1,4 +1,5 @@
 .vizicities-attribution {
+  position: relative;
   background: rgba(255, 255, 255, 0.9);
   border-radius: 3px 0 0;
   bottom: 0;
@@ -16,7 +17,25 @@
   text-decoration: none;
 }
 
-  .vizicities-attribution a:hover {
-    color: #2bb2ed;
-    text-decoration: underline;
-  }
+.vizicities-attribution a:hover {
+color: #2bb2ed;
+text-decoration: underline;
+}
+
+#attribution-container {
+  position: absolute;
+  right: 0;
+  bottom: 0;
+  z-index: -1;
+  width: 250px;
+  padding: 4px 7px;
+  padding-right: 120px;
+  background: rgba(255, 255, 255, 0.9);
+  border-radius: 3px 0 0;
+  opacity: 0;
+  transition: opacity 100ms linear;
+}
+
+.is-visible #attribution-container {
+  opacity: 1;
+}