1 /* 2 * Copyright 2005 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.google.common.geometry; 17 18 public strictfp class S2LatLngTest extends GeometryTestCase { 19 testBasic()20 public void testBasic() { 21 S2LatLng llRad = S2LatLng.fromRadians(S2.M_PI_4, S2.M_PI_2); 22 assertTrue(llRad.lat().radians() == S2.M_PI_4); 23 assertTrue(llRad.lng().radians() == S2.M_PI_2); 24 assertTrue(llRad.isValid()); 25 S2LatLng llDeg = S2LatLng.fromDegrees(45, 90); 26 assertEquals(llDeg, llRad); 27 assertTrue(llDeg.isValid()); 28 assertTrue(!S2LatLng.fromDegrees(-91, 0).isValid()); 29 assertTrue(!S2LatLng.fromDegrees(0, 181).isValid()); 30 31 S2LatLng bad = S2LatLng.fromDegrees(120, 200); 32 assertTrue(!bad.isValid()); 33 S2LatLng better = bad.normalized(); 34 assertTrue(better.isValid()); 35 assertEquals(better.lat(), S1Angle.degrees(90)); 36 assertDoubleNear(better.lng().radians(), S1Angle.degrees(-160).radians()); 37 38 bad = S2LatLng.fromDegrees(-100, -360); 39 assertTrue(!bad.isValid()); 40 better = bad.normalized(); 41 assertTrue(better.isValid()); 42 assertEquals(better.lat(), S1Angle.degrees(-90)); 43 assertDoubleNear(better.lng().radians(), 0); 44 45 assertTrue((S2LatLng.fromDegrees(10, 20).add(S2LatLng.fromDegrees(20, 30))).approxEquals( 46 S2LatLng.fromDegrees(30, 50))); 47 assertTrue((S2LatLng.fromDegrees(10, 20).sub(S2LatLng.fromDegrees(20, 30))).approxEquals( 48 S2LatLng.fromDegrees(-10, -10))); 49 assertTrue((S2LatLng.fromDegrees(10, 20).mul(0.5)).approxEquals(S2LatLng.fromDegrees(5, 10))); 50 } 51 testConversion()52 public void testConversion() { 53 // Test special cases: poles, "date line" 54 assertDoubleNear( 55 new S2LatLng(S2LatLng.fromDegrees(90.0, 65.0).toPoint()).lat().degrees(), 90.0); 56 assertEquals( 57 new S2LatLng(S2LatLng.fromRadians(-S2.M_PI_2, 1).toPoint()).lat().radians(), -S2.M_PI_2); 58 assertDoubleNear( 59 Math.abs(new S2LatLng(S2LatLng.fromDegrees(12.2, 180.0).toPoint()).lng().degrees()), 180.0); 60 assertEquals( 61 Math.abs(new S2LatLng(S2LatLng.fromRadians(0.1, -S2.M_PI).toPoint()).lng().radians()), 62 S2.M_PI); 63 64 // Test a bunch of random points. 65 for (int i = 0; i < 100000; ++i) { 66 S2Point p = randomPoint(); 67 assertTrue(S2.approxEquals(p, new S2LatLng(p).toPoint())); 68 } 69 70 // Test generation from E5 71 S2LatLng test = S2LatLng.fromE5(123456, 98765); 72 assertDoubleNear(test.lat().degrees(), 1.23456); 73 assertDoubleNear(test.lng().degrees(), 0.98765); 74 } 75 testDistance()76 public void testDistance() { 77 assertEquals( 78 S2LatLng.fromDegrees(90, 0).getDistance(S2LatLng.fromDegrees(90, 0)).radians(), 0.0); 79 assertDoubleNear( 80 S2LatLng.fromDegrees(-37, 25).getDistance(S2LatLng.fromDegrees(-66, -155)).degrees(), 77, 81 1e-13); 82 assertDoubleNear( 83 S2LatLng.fromDegrees(0, 165).getDistance(S2LatLng.fromDegrees(0, -80)).degrees(), 115, 84 1e-13); 85 assertDoubleNear( 86 S2LatLng.fromDegrees(47, -127).getDistance(S2LatLng.fromDegrees(-47, 53)).degrees(), 180, 87 2e-6); 88 } 89 } 90