Added Center Map Function

src/main/java/seng202/group9/GUI/AirlineGraphController.java

@@ -113,11 +113,11 @@ public class AirlineGraphController extends Controller{
                 countries.put(airline.getCountryName(), 1);
             }
         }
-
         int length = 10;
         if (airlinesFiltered.length < 10){
             length = airlinesFiltered.length;
         }
+
         for (int i = 0 ; i < length; i ++) {
             int max = 0;
             String maxCountry = null;
@@ -130,7 +130,7 @@ public class AirlineGraphController extends Controller{
             series.getData().add(new XYChart.Data<String, Integer>(maxCountry, max));
             countries.remove(maxCountry);
         }
-
+        System.out.println(countries.size());
         countryGraph.getData().add(series);
     }
 

src/main/java/seng202/group9/Map/Map.java

@@ -36,6 +36,7 @@ public class Map {
                     }
                 }
             });
+
     }
 
     public Map(WebView webView, final ArrayList<RoutePath> newRoute, final int type){

src/main/resources/map.html

@@ -28,6 +28,10 @@
             center: {lat: 39.144684, lng: -84.510079},
             zoom: 5
         });
+        google.maps.event.addListener(map, 'center_changed', function() {
+            checkBounds(map);
+        });
+        map.setOptions({ minZoom: 2, maxZoom: 18});
 
         new google.maps.Marker({
             position: {lat: 39.144684, lng: -84.510079},
@@ -42,6 +46,12 @@
             zoom: 5
         });
 
+
+        google.maps.event.addListener(map, 'center_changed', function() {
+            checkBounds(map);
+        });
+        map.setOptions({ minZoom: 2, maxZoom: 18});
+
         new google.maps.Marker({
             position: position[0],
             map: map,
@@ -54,6 +64,11 @@
             center: positions[0],
             zoom: 5
         });
+
+        google.maps.event.addListener(map, 'center_changed', function() {
+            checkBounds(map);
+        });
+        map.setOptions({ minZoom: 2, maxZoom: 18});
         for (var i = 0; i < positions.length; i ++) {
             new google.maps.Marker({
                 position: positions[i][0],
@@ -69,6 +84,11 @@
             center: {lat: 39.144684, lng: -84.510079},
             zoom: 15
         });
+
+        google.maps.event.addListener(map, 'center_changed', function() {
+            checkBounds(map);
+        });
+        map.setOptions({ minZoom: 2, maxZoom: 18});
         // CLEAR EXISTING MARKERS
         if (marker1 !== undefined && marker2 !== undefined && path !== undefined) {
             marker1.setMap(null);
@@ -110,6 +130,11 @@
             center: {lat: 0, lng: 0},
             zoom: 5
         });
+
+        google.maps.event.addListener(map, 'center_changed', function() {
+            checkBounds(map);
+        });
+        map.setOptions({ minZoom: 2, maxZoom: 18});
         for (var i = 0; i < flightPaths.length; i++) {
             var tempMarker1 = null;
             var tempMarker2 = null;
@@ -165,6 +190,31 @@
 
         map.fitBounds(bounds);
     }
+
+    function checkBounds(map) {
+
+        var latNorth = map.getBounds().getNorthEast().lat();
+        var latSouth = map.getBounds().getSouthWest().lat();
+        var newLat;
+
+        if(latNorth<85 && latSouth>-85)     /* in both side -> it's ok */
+            return;
+        else {
+            if(latNorth>85 && latSouth<-85)   /* out both side -> it's ok */
+                return;
+            else {
+                if(latNorth>85)
+                    newLat =  map.getCenter().lat() - (latNorth-85);   /* too north, centering */
+                if(latSouth<-85)
+                    newLat =  map.getCenter().lat() - (latSouth+85);   /* too south, centering */
+            }
+        }
+        //re-centre the map
+        if(newLat) {
+            var newCenter= new google.maps.LatLng( newLat ,map.getCenter().lng() );
+            map.setCenter(newCenter);
+        }
+    }
 </script>
 <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBnt2PJyKZsh-qrsTkbZwSGuUNWPromlLg&callback=initMap" defer></script>
 </body>