+++ /dev/null
-/**
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.lucene.spatial.geometry;
-
-
-/**
- * Abstract base lat-lng class which can manipulate fixed point or floating
- * point based coordinates. Instances are immutable.
- *
- * @see FloatLatLng
- *
- * <p><font color="red"><b>NOTE:</b> This API is still in
- * flux and might change in incompatible ways in the next
- * release.</font>
- */
-public abstract class LatLng {
-
- public abstract boolean isNormalized();
-
- public abstract boolean isFixedPoint();
-
- public abstract LatLng normalize();
-
- public abstract int getFixedLat();
-
- public abstract int getFixedLng();
-
- public abstract double getLat();
-
- public abstract double getLng();
-
- public abstract LatLng copy();
-
- public abstract FixedLatLng toFixed();
-
- public abstract FloatLatLng toFloat();
-
- /**
- * Convert the lat/lng into the cartesian coordinate plane such that all
- * world coordinates are represented in the first quadrant.
- * The x dimension corresponds to latitude and y corresponds to longitude.
- * The translation starts with the normalized latlng and adds 180 to the latitude and
- * 90 to the longitude (subject to fixed point scaling).
- */
- public CartesianPoint toCartesian() {
- LatLng ll=normalize();
-
- int lat=ll.getFixedLat();
- int lng=ll.getFixedLng();
-
- return new CartesianPoint(
- lng+180*FixedLatLng.SCALE_FACTOR_INT,
- lat+90*FixedLatLng.SCALE_FACTOR_INT
- );
- }
-
- /**
- * The inverse of toCartesian(). Always returns a FixedLatLng.
- * @param pt
- */
- public static LatLng fromCartesian(CartesianPoint pt) {
- int lat=pt.getY() - 90 * FixedLatLng.SCALE_FACTOR_INT;
- int lng=pt.getX() - 180 * FixedLatLng.SCALE_FACTOR_INT;
-
- return new FixedLatLng(lat, lng);
- }
-
- /**
- * Calculates the distance between two lat/lng's in miles.
- * Imported from mq java client.
- *
- * @param ll2
- * Second lat,lng position to calculate distance to.
- *
- * @return Returns the distance in miles.
- */
- public double arcDistance(LatLng ll2) {
- return arcDistance(ll2, DistanceUnits.MILES);
- }
-
- /**
- * Calculates the distance between two lat/lng's in miles or meters.
- * Imported from mq java client. Variable references changed to match.
- *
- * @param ll2
- * Second lat,lng position to calculate distance to.
- * @param lUnits
- * Units to calculate distance, defaults to miles
- *
- * @return Returns the distance in meters or miles.
- */
- public double arcDistance(LatLng ll2, DistanceUnits lUnits) {
- LatLng ll1 = normalize();
- ll2 = ll2.normalize();
-
- double lat1 = ll1.getLat(), lng1 = ll1.getLng();
- double lat2 = ll2.getLat(), lng2 = ll2.getLng();
-
- // Check for same position
- if (lat1 == lat2 && lng1 == lng2)
- return 0.0;
-
- // Get the m_dLongitude difference. Don't need to worry about
- // crossing 180 since cos(x) = cos(-x)
- double dLon = lng2 - lng1;
-
- double a = radians(90.0 - lat1);
- double c = radians(90.0 - lat2);
- double cosB = (Math.cos(a) * Math.cos(c))
- + (Math.sin(a) * Math.sin(c) * Math.cos(radians(dLon)));
-
- double radius = (lUnits == DistanceUnits.MILES) ? 3963.205/* MILERADIUSOFEARTH */
- : 6378.160187/* KMRADIUSOFEARTH */;
-
- // Find angle subtended (with some bounds checking) in radians and
- // multiply by earth radius to find the arc distance
- if (cosB < -1.0)
- return 3.14159265358979323846/* PI */* radius;
- else if (cosB >= 1.0)
- return 0;
- else
- return Math.acos(cosB) * radius;
- }
-
- private double radians(double a) {
- return a * 0.01745329251994;
- }
-
- @Override
- public String toString() {
- return "[" + getLat() + "," + getLng() + "]";
- }
-
- /**
- * Calculate the midpoint between this point an another. Respects fixed vs floating point
- * @param other
- */
- public abstract LatLng calculateMidpoint(LatLng other);
-
- @Override
- public abstract int hashCode();
-
- @Override
- public abstract boolean equals(Object obj);
-}
fnp / pylucene.git / blobdiff