Add coordinates transformation example

Author: interactive-game-maps

map.js

@@ -9,7 +9,9 @@
 // Step 1:
 // Initialize the map with basic information
 var interactive_map = new InteractiveMap('map', {
+    // This will limit automatic zooming to this zoom level
     max_good_zoom: 6,
+    // This is the max zoom the map will allow
     max_map_zoom: 8,
     website_source: 'https://github.com/interactive-game-maps/template',
     website_subdir: 'template',

marker_logic/information.js

@@ -82,6 +82,14 @@ function addInformation(map) {
                 fillColor: 'red',
                 fillOpacity: 0.2
             };
+        },
+
+        // If the coordinates are extracted from the game files they might need a transformation to
+        // map correctly
+        coordsToLatLng: function (coords) {
+            var lx = (coords[0] + 1) * 0.5;
+            var ly = (coords[1] - 1) * 0.5;
+            return L.latLng(ly, lx);
         }
 
         // Some additional notes: