From aae16d2c1b7a12b700de936ced699cf16d473efe Mon Sep 17 00:00:00 2001
From: Jon Atkins <github@jonatkins.com>
Date: Fri, 6 Dec 2013 08:36:50 +0000
Subject: [PATCH] basemap-bing plugin: dynamic creation of bing map layer - in
 theory should reduce usage

---
 plugins/basemap-bing.user.js | 31 +++++++++++++++++++++++++++----
 1 file changed, 27 insertions(+), 4 deletions(-)

diff --git a/plugins/basemap-bing.user.js b/plugins/basemap-bing.user.js
index 43d0fea8..52944b49 100644
--- a/plugins/basemap-bing.user.js
+++ b/plugins/basemap-bing.user.js
@@ -2,7 +2,7 @@
 // @id             iitc-plugin-bing-maps
 // @name           IITC plugin: Bing maps
 // @category       Map Tiles
-// @version        0.1.1.@@DATETIMEVERSION@@
+// @version        0.1.2.@@DATETIMEVERSION@@
 // @namespace      https://github.com/jonatkins/ingress-intel-total-conversion
 // @updateURL      @@UPDATEURL@@
 // @downloadURL    @@DOWNLOADURL@@
@@ -23,7 +23,7 @@ window.plugin.mapBing = function() {};
 window.plugin.mapBing.setupBingLeaflet = function() {
 @@INCLUDERAW:external/Bing.js@@
 }
-	
+
 
 window.plugin.mapBing.setup = function() {
   window.plugin.mapBing.setupBingLeaflet();
@@ -37,12 +37,35 @@ window.plugin.mapBing.setup = function() {
     'AerialWithLabels': "Aerial with labels",
   };
 
+  // bing maps has an annual usage limit, which will likely be hit in 6 months at this time.
+  // it seems that the usage is counted on initialising the L.BingLayer, when the metadata is retrieved.
+  // so, we'll create some dummy layers and add those to the map, then, the first time a layer is added,
+  // create the L.BingLayer. This will eliminate all usage for users who install but don't use the map,
+  // and only create usage for the map layers actually selected in use
+
+  var bingMapContainers = [];
+
   for (type in bingTypes) {
     var name = bingTypes[type];
-    var bingMap = new L.BingLayer(bingApiKey, {type: type, maxZoom:20});
-    layerChooser.addBaseLayer(bingMap, 'Bing '+name);
+
+    bingMapContainers[type] = new L.LayerGroup();
+    layerChooser.addBaseLayer(bingMapContainers[type], 'Bing '+name);
   }
 
+  // now a leaflet event to catch base layer changes and create a L.BingLayer when needed
+  map.on('baselayerchange', function(e) {
+    for (type in bingMapContainers) {
+      if (e.layer == bingMapContainers[type]) {
+        if (bingMapContainers[type].getLayers().length == 0) {
+          // dummy layer group is empty - create the bing layer
+          console.log('basemap-bing: creating '+type+' layer');
+          var bingMap = new L.BingLayer (bingApiKey, {type: type, maxZoom:20});
+          bingMapContainers[type].addLayer(bingMap);
+        }
+      }
+    }
+  });
+
 };
 
 var setup = window.plugin.mapBing.setup;