[android] #4475 - Introducing LatLng.wrap() and removing usage of wra…

…p() in JNI's nativeLatLngForPixel()

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/geometry/LatLng.java

@@ -6,6 +6,7 @@
 
 import com.mapbox.mapboxsdk.constants.GeoConstants;
 import com.mapbox.mapboxsdk.constants.MathConstants;
+import com.mapbox.mapboxsdk.utils.MathUtils;
 
 import java.io.Serializable;
 
@@ -118,6 +119,17 @@ public double getAltitude() {
         return altitude;
     }
 
+    /**
+     * Return a new LatLng object with a wrapped Longitude.  This allows original data object
+     * to remain unchanged.
+     * @return New LatLng object with wrapped Longitude
+     */
+    public LatLng wrap(){
+        LatLng wrappedVersion = new LatLng(this);
+        wrappedVersion.setLongitude(MathUtils.wrap(wrappedVersion.getLongitude(), GeoConstants.MIN_LONGITUDE, GeoConstants.MAX_LONGITUDE));
+        return wrappedVersion;
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) {

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/MathUtils.java

@@ -24,4 +24,23 @@ public static float clamp(float value, float min, float max) {
         return Math.max(min, Math.min(max, value));
     }
 
+    /**
+     * Constrains n to the given range (including min, excluding max) via modular arithmetic.
+     *
+     * Same formula as used in Core GL (math.hpp)
+     * std::fmod((std::fmod((value - min), d) + d), d) + min;
+     *
+     * @param value Value to wrap
+     * @param min Minimum value
+     * @param max Maximum value
+     * @return Wrapped value
+     */
+    public static double wrap(double value, double min, double max) {
+        double delta = max - min;
+
+        double firstMod = (value - min) % delta;
+        double secondMod = (firstMod + delta) % delta;
+
+        return secondMod + min;
+    }
 }

platform/android/MapboxGLAndroidSDKTestApp/src/test/java/com/mapbox/mapboxsdk/geometry/LatLngTest.java

@@ -2,19 +2,17 @@
 
 import android.location.Location;
 import android.os.Parcel;
-
 import com.mapbox.mapboxsdk.geometry.LatLng;
 import com.mapbox.mapboxsdk.utils.MockParcel;
-
 import org.junit.Test;
-
 import java.util.Objects;
-
+import dalvik.annotation.TestTargetClass;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
@@ -202,4 +200,11 @@ public void testDescribeContents() {
         assertEquals("contents should be 0", 0, latLng.describeContents(), DELTA);
     }
 
+    @Test
+    public void testWrapped() {
+        LatLng latLng = new LatLng(45.0, -185.0);
+        LatLng wrapped = latLng.wrap();
+        assertTrue(!latLng.equals(wrapped));
+        assertTrue(wrapped.getLongitude() == 175.0);
+    }
 }

platform/android/src/jni.cpp

@@ -1176,7 +1176,7 @@ jni::jobject* nativeLatLngForPixel(JNIEnv *env, jni::jobject* obj, jlong nativeM
     jfloat x = jni::GetField<jfloat>(*env, pixel, *pointFXId);
     jfloat y = jni::GetField<jfloat>(*env, pixel, *pointFYId);
 
-    mbgl::LatLng latLng = nativeMapView->getMap().latLngForPixel(mbgl::ScreenCoordinate(x, y)).wrapped();
+    mbgl::LatLng latLng = nativeMapView->getMap().latLngForPixel(mbgl::ScreenCoordinate(x, y));
     return &jni::NewObject(*env, *latLngClass, *latLngConstructorId, latLng.latitude, latLng.longitude);
 }