1 files changed, 47 insertions, 23 deletions

diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/geometry/LatLngBounds.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/geometry/LatLngBounds.java
index 4fcb91033c..6d027a0cef 100644
--- a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/geometry/LatLngBounds.java
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/geometry/LatLngBounds.java
@@ -5,8 +5,8 @@ import android.os.Parcelable;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 
+import com.mapbox.mapboxsdk.constants.GeometryConstants;
 import com.mapbox.mapboxsdk.exceptions.InvalidLatLngBoundsException;
-import com.mapbox.services.android.telemetry.constants.GeoConstants;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -48,8 +48,8 @@ public class LatLngBounds implements Parcelable {
    */
   public static LatLngBounds world() {
     return new LatLngBounds.Builder()
-      .include(new LatLng(GeoConstants.MAX_LATITUDE, GeoConstants.MAX_LONGITUDE))
-      .include(new LatLng(GeoConstants.MIN_LATITUDE, GeoConstants.MIN_LONGITUDE))
+      .include(new LatLng(GeometryConstants.MAX_LATITUDE, GeometryConstants.MAX_LONGITUDE))
+      .include(new LatLng(GeometryConstants.MIN_LATITUDE, GeometryConstants.MIN_LONGITUDE))
       .build();
   }
 
@@ -194,10 +194,10 @@ public class LatLngBounds implements Parcelable {
    * @return LatLngBounds
    */
   static LatLngBounds fromLatLngs(final List<? extends ILatLng> latLngs) {
-    double minLat = 90;
-    double minLon = 180;
-    double maxLat = -90;
-    double maxLon = -180;
+    double minLat = GeometryConstants.MAX_LATITUDE;
+    double minLon = GeometryConstants.MAX_LONGITUDE;
+    double maxLat = GeometryConstants.MIN_LATITUDE;
+    double maxLon = GeometryConstants.MIN_LONGITUDE;
 
     for (final ILatLng gp : latLngs) {
       final double latitude = gp.getLatitude();
@@ -231,6 +231,30 @@ public class LatLngBounds implements Parcelable {
     return new LatLngBounds(latNorth, lonEast, latSouth, lonWest);
   }
 
+  private static double lat_(int z, int y) {
+    double n = Math.PI - 2.0 * Math.PI * y / Math.pow(2.0, z);
+    return Math.toDegrees(Math.atan(0.5 * (Math.exp(n) - Math.exp(-n))));
+  }
+
+  private static double lon_(int z, int x) {
+    return x / Math.pow(2.0, z) * 360.0 - GeometryConstants.MAX_LONGITUDE;
+  }
+
+  /**
+   * Constructs a LatLngBounds from a Tile identifier.
+   *
+   * Returned bounds will have latitude in the range of Mercator projection.
+   * @see GeometryConstants#MIN_MERCATOR_LATITUDE
+   * @see GeometryConstants#MAX_MERCATOR_LATITUDE
+   *
+   * @param z Tile zoom level.
+   * @param x Tile X coordinate.
+   * @param y Tile Y coordinate.
+   */
+  public static LatLngBounds from(int z, int x, int y) {
+    return new LatLngBounds(lat_(z, y), lon_(z, x + 1), lat_(z, y + 1), lon_(z, x));
+  }
+
   /**
    * Constructs a LatLngBounds from current bounds with an additional latitude-longitude pair.
    *
@@ -305,17 +329,17 @@ public class LatLngBounds implements Parcelable {
    * Returns a new LatLngBounds that stretches to include another LatLngBounds,
    * given by corner points.
    *
-   * @param lonNorth Northern Longitude
-   * @param latEast  Eastern Latitude
-   * @param lonSouth Southern Longitude
-   * @param latWest  Western Longitude
+   * @param latNorth Northern Latitude
+   * @param lonEast  Eastern Longitude
+   * @param latSouth Southern Latitude
+   * @param lonWest  Western Longitude
    * @return BoundingBox
    */
-  public LatLngBounds union(final double lonNorth, final double latEast, final double lonSouth, final double latWest) {
-    return new LatLngBounds((this.latitudeNorth < lonNorth) ? lonNorth : this.latitudeNorth,
-      (this.longitudeEast < latEast) ? latEast : this.longitudeEast,
-      (this.latitudeSouth > lonSouth) ? lonSouth : this.latitudeSouth,
-      (this.longitudeWest > latWest) ? latWest : this.longitudeWest);
+  public LatLngBounds union(final double latNorth, final double lonEast, final double latSouth, final double lonWest) {
+    return new LatLngBounds((this.latitudeNorth < latNorth) ? latNorth : this.latitudeNorth,
+      (this.longitudeEast < lonEast) ? lonEast : this.longitudeEast,
+      (this.latitudeSouth > latSouth) ? latSouth : this.latitudeSouth,
+      (this.longitudeWest > lonWest) ? lonWest : this.longitudeWest);
   }
 
   /**
@@ -326,13 +350,13 @@ public class LatLngBounds implements Parcelable {
    */
   @Nullable
   public LatLngBounds intersect(LatLngBounds box) {
-    double minLatWest = Math.max(getLonWest(), box.getLonWest());
-    double maxLatEast = Math.min(getLonEast(), box.getLonEast());
-    if (maxLatEast > minLatWest) {
-      double minLonSouth = Math.max(getLatSouth(), box.getLatSouth());
-      double maxLonNorth = Math.min(getLatNorth(), box.getLatNorth());
-      if (maxLonNorth > minLonSouth) {
-        return new LatLngBounds(maxLonNorth, maxLatEast, minLonSouth, minLatWest);
+    double minLonWest = Math.max(getLonWest(), box.getLonWest());
+    double maxLonEast = Math.min(getLonEast(), box.getLonEast());
+    if (maxLonEast > minLonWest) {
+      double minLatSouth = Math.max(getLatSouth(), box.getLatSouth());
+      double maxLatNorth = Math.min(getLatNorth(), box.getLatNorth());
+      if (maxLatNorth > minLatSouth) {
+        return new LatLngBounds(maxLatNorth, maxLonEast, minLatSouth, minLonWest);
       }
     }
     return null;