From 030f80018bb8d904cbe871209bc26e6f341a1c70 Mon Sep 17 00:00:00 2001
From: Silvio <silvio@socioambiental.org>
Date: Mon, 8 Apr 2013 19:45:28 -0300
Subject: Minor fixes and getZoomByBounds method

---
 gmap_arcgis.js | 44 +++++++++++++++++++++++++++++++++++++-------
 1 file changed, 37 insertions(+), 7 deletions(-)

diff --git a/gmap_arcgis.js b/gmap_arcgis.js
index 9a9b4db..a2c8b53 100644
--- a/gmap_arcgis.js
+++ b/gmap_arcgis.js
@@ -4,7 +4,7 @@ function gmapArcgis(config) {
   return {
     // Storable properties
     config: config,
-    map:    config.map,
+    map:    (config.map != undefined) ? config.map : null,
 
     // UI unblocker wrapper
     unblockUI: function() {
@@ -219,21 +219,21 @@ function gmapArcgis(config) {
         var fs = fset.features;
         var title;
         for (var i = 0, c = fs.length; i < c; i++) {
-          fset = fs[i];
+          var feature = fs[i];
 
           if (self.config['markers'][element].title != undefined) {
-            title = fset.attributes[self.config['markers'][element].title];
+            title = feature.attributes[self.config['markers'][element].title];
           }
           else {
-            title = fset.attributes.nome;
+            title = feature.attributes.nome;
           }
     
           self.config['markers'][element].overlay[i] = {};
           self.config['markers'][element].overlay[i].marker = new google.maps.Marker({
             title:    title,
             icon:     self.config['markers'][element].icon,
-            position: fset.geometry[0].getPosition(),
-            map:      map,
+            position: feature.geometry[0].getPosition(),
+            map:      self.map,
           });
     
           // Use a closure so marker data remains available to the listeners
@@ -241,7 +241,7 @@ function gmapArcgis(config) {
             var marker     = self.config['markers'][element].overlay[i].marker;
             var infowindow = self.config['markers'][element].infowindow;
             var content    = self.config['markers'][element].content;
-            var attributes = fset.attributes;
+            var attributes = feature.attributes;
     
             google.maps.event.addListener(marker, 'click', function() {
               infowindow.setContent(content(attributes));
@@ -375,5 +375,35 @@ function gmapArcgis(config) {
       });
     },
 
+    /**
+     * Returns the zoom level at which the given rectangular region fits in the map view.
+     * The zoom level is computed for the currently selected map type.
+     *
+     * @param {google.maps.Map} map
+     * @param {google.maps.LatLngBounds} bounds
+     * @return {Number} zoom level
+     * @see http://stackoverflow.com/questions/9837017/equivalent-of-getboundszoomlevel-in-gmaps-api-3
+     */
+    getZoomByBounds: function(bounds) {
+      var map              = this.map();
+      var MAX_ZOOM         = map.mapTypes.get(map.getMapTypeId()).maxZoom || 21;
+      var MIN_ZOOM         = map.mapTypes.get(map.getMapTypeId()).minZoom || 0;
+      var ne               = map.getProjection().fromLatLngToPoint(bounds.getNorthEast());
+      var sw               = map.getProjection().fromLatLngToPoint(bounds.getSouthWest());
+      var worldCoordWidth  = Math.abs(ne.x-sw.x);
+      var worldCoordHeight = Math.abs(ne.y-sw.y);
+
+      // Fit padding in pixels
+      var FIT_PAD = 40;
+
+      for (var zoom = MAX_ZOOM; zoom >= MIN_ZOOM; --zoom) {
+        if (worldCoordWidth*(1<<zoom)+2*FIT_PAD < $(map.getDiv()).width() &&
+            worldCoordHeight*(1<<zoom)+2*FIT_PAD < $(map.getDiv()).height()) {
+              return zoom;
+            }
+      }
+
+      return 0;
+    }
   }
 };
-- 
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