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TestTraversal.java
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TestTraversal.java
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/*
* Copyright 2019, 2022 Uber Technologies, Inc.
*
* Licensed 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 com.uber.h3core;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import com.uber.h3core.exceptions.H3Exception;
import com.uber.h3core.util.CoordIJ;
import java.util.List;
import org.junit.Test;
/** Tests for grid traversal functions (k-ring, distance and line, and local IJ coordinates). */
public class TestTraversal extends BaseTestH3Core {
@Test
public void testKring() {
List<String> hexagons = h3.gridDisk("8928308280fffff", 1);
assertEquals(1 + 6, hexagons.size());
assertTrue(hexagons.contains("8928308280fffff"));
assertTrue(hexagons.contains("8928308280bffff"));
assertTrue(hexagons.contains("89283082807ffff"));
assertTrue(hexagons.contains("89283082877ffff"));
assertTrue(hexagons.contains("89283082803ffff"));
assertTrue(hexagons.contains("89283082873ffff"));
assertTrue(hexagons.contains("8928308283bffff"));
}
@Test
public void testKring2() {
List<String> hexagons = h3.gridDisk("8928308280fffff", 2);
assertEquals(1 + 6 + 12, hexagons.size());
assertTrue(hexagons.contains("89283082813ffff"));
assertTrue(hexagons.contains("89283082817ffff"));
assertTrue(hexagons.contains("8928308281bffff"));
assertTrue(hexagons.contains("89283082863ffff"));
assertTrue(hexagons.contains("89283082823ffff"));
assertTrue(hexagons.contains("89283082873ffff"));
assertTrue(hexagons.contains("89283082877ffff"));
assertTrue(hexagons.contains("8928308287bffff"));
assertTrue(hexagons.contains("89283082833ffff"));
assertTrue(hexagons.contains("8928308282bffff"));
assertTrue(hexagons.contains("8928308283bffff"));
assertTrue(hexagons.contains("89283082857ffff"));
assertTrue(hexagons.contains("892830828abffff"));
assertTrue(hexagons.contains("89283082847ffff"));
assertTrue(hexagons.contains("89283082867ffff"));
assertTrue(hexagons.contains("89283082803ffff"));
assertTrue(hexagons.contains("89283082807ffff"));
assertTrue(hexagons.contains("8928308280bffff"));
assertTrue(hexagons.contains("8928308280fffff"));
}
@Test
public void testKringLarge() {
int k = 50;
List<String> hexagons = h3.gridDisk("8928308280fffff", k);
int expectedCount = 1;
for (int i = 1; i <= k; i++) {
expectedCount += i * 6;
}
assertEquals(expectedCount, hexagons.size());
}
@Test(expected = IllegalArgumentException.class)
public void testKringTooLarge() {
int k = 13780510;
// Cannot be materialized into Java because the maximum array size is INT32_MAX
h3.gridDisk(h3.latLngToCell(0, 0, 15), k);
}
@Test
public void testKringPentagon() {
List<String> hexagons = h3.gridDisk("821c07fffffffff", 1);
assertEquals(1 + 5, hexagons.size());
assertTrue(hexagons.contains("821c2ffffffffff"));
assertTrue(hexagons.contains("821c27fffffffff"));
assertTrue(hexagons.contains("821c07fffffffff"));
assertTrue(hexagons.contains("821c17fffffffff"));
assertTrue(hexagons.contains("821c1ffffffffff"));
assertTrue(hexagons.contains("821c37fffffffff"));
}
@Test
public void testHexRange() {
List<List<String>> hexagons = h3.gridDiskUnsafe("8928308280fffff", 1);
assertEquals(2, hexagons.size());
assertEquals(1, hexagons.get(0).size());
assertEquals(6, hexagons.get(1).size());
assertTrue(hexagons.get(0).contains("8928308280fffff"));
assertTrue(hexagons.get(1).contains("8928308280bffff"));
assertTrue(hexagons.get(1).contains("89283082807ffff"));
assertTrue(hexagons.get(1).contains("89283082877ffff"));
assertTrue(hexagons.get(1).contains("89283082803ffff"));
assertTrue(hexagons.get(1).contains("89283082873ffff"));
assertTrue(hexagons.get(1).contains("8928308283bffff"));
}
@Test
public void testKRingDistances() {
List<List<String>> hexagons = h3.gridDiskDistances("8928308280fffff", 1);
assertEquals(2, hexagons.size());
assertEquals(1, hexagons.get(0).size());
assertEquals(6, hexagons.get(1).size());
assertTrue(hexagons.get(0).contains("8928308280fffff"));
assertTrue(hexagons.get(1).contains("8928308280bffff"));
assertTrue(hexagons.get(1).contains("89283082807ffff"));
assertTrue(hexagons.get(1).contains("89283082877ffff"));
assertTrue(hexagons.get(1).contains("89283082803ffff"));
assertTrue(hexagons.get(1).contains("89283082873ffff"));
assertTrue(hexagons.get(1).contains("8928308283bffff"));
}
@Test
public void testHexRange2() {
List<List<String>> hexagons = h3.gridDiskDistances("8928308280fffff", 2);
assertEquals(3, hexagons.size());
assertEquals(1, hexagons.get(0).size());
assertEquals(6, hexagons.get(1).size());
assertEquals(12, hexagons.get(2).size());
assertTrue(hexagons.get(0).contains("8928308280fffff"));
assertTrue(hexagons.get(1).contains("8928308280bffff"));
assertTrue(hexagons.get(1).contains("89283082873ffff"));
assertTrue(hexagons.get(1).contains("89283082877ffff"));
assertTrue(hexagons.get(1).contains("8928308283bffff"));
assertTrue(hexagons.get(1).contains("89283082807ffff"));
assertTrue(hexagons.get(1).contains("89283082803ffff"));
assertTrue(hexagons.get(2).contains("8928308281bffff"));
assertTrue(hexagons.get(2).contains("89283082857ffff"));
assertTrue(hexagons.get(2).contains("89283082847ffff"));
assertTrue(hexagons.get(2).contains("8928308287bffff"));
assertTrue(hexagons.get(2).contains("89283082863ffff"));
assertTrue(hexagons.get(2).contains("89283082867ffff"));
assertTrue(hexagons.get(2).contains("8928308282bffff"));
assertTrue(hexagons.get(2).contains("89283082823ffff"));
assertTrue(hexagons.get(2).contains("89283082833ffff"));
assertTrue(hexagons.get(2).contains("892830828abffff"));
assertTrue(hexagons.get(2).contains("89283082817ffff"));
assertTrue(hexagons.get(2).contains("89283082813ffff"));
}
@Test
public void testKRingDistancesPentagon() {
h3.gridDiskDistances("821c07fffffffff", 1);
// No exception should happen
}
@Test(expected = H3Exception.class)
public void testHexRangePentagon() {
h3.gridDiskUnsafe("821c07fffffffff", 1);
}
@Test
public void testHexRing() {
List<String> hexagons = h3.gridRingUnsafe("8928308280fffff", 1);
assertEquals(6, hexagons.size());
assertTrue(hexagons.contains("8928308280bffff"));
assertTrue(hexagons.contains("89283082807ffff"));
assertTrue(hexagons.contains("89283082877ffff"));
assertTrue(hexagons.contains("89283082803ffff"));
assertTrue(hexagons.contains("89283082873ffff"));
assertTrue(hexagons.contains("8928308283bffff"));
}
@Test
public void testHexRing2() {
List<String> hexagons = h3.gridRingUnsafe("8928308280fffff", 2);
assertEquals(12, hexagons.size());
assertTrue(hexagons.contains("89283082813ffff"));
assertTrue(hexagons.contains("89283082817ffff"));
assertTrue(hexagons.contains("8928308281bffff"));
assertTrue(hexagons.contains("89283082863ffff"));
assertTrue(hexagons.contains("89283082823ffff"));
assertTrue(hexagons.contains("8928308287bffff"));
assertTrue(hexagons.contains("89283082833ffff"));
assertTrue(hexagons.contains("8928308282bffff"));
assertTrue(hexagons.contains("89283082857ffff"));
assertTrue(hexagons.contains("892830828abffff"));
assertTrue(hexagons.contains("89283082847ffff"));
assertTrue(hexagons.contains("89283082867ffff"));
}
@Test
public void testHexRingLarge() {
int k = 50;
List<String> hexagons = h3.gridRingUnsafe("8928308280fffff", k);
int expectedCount = 50 * 6;
assertEquals(expectedCount, hexagons.size());
}
@Test(expected = H3Exception.class)
public void testHexRingPentagon() {
h3.gridRingUnsafe("821c07fffffffff", 1);
}
@Test(expected = H3Exception.class)
public void testHexRingAroundPentagon() {
h3.gridRingUnsafe("821c37fffffffff", 2);
}
@Test
public void testHexRingSingle() {
String origin = "8928308280fffff";
List<String> hexagons = h3.gridRingUnsafe(origin, 0);
assertEquals(1, hexagons.size());
assertEquals("8928308280fffff", hexagons.get(0));
}
@Test(expected = H3Exception.class)
public void testH3DistanceFailedDistance() {
// This fails because of a limitation in the H3 core library.
// It cannot find distances when spanning more than one base cell.
// Expected correct result is 2.
h3.gridDistance("8029fffffffffff", "8079fffffffffff");
}
@Test(expected = H3Exception.class)
public void testH3DistanceFailedResolution() {
// Cannot find distances when the indexes are not comparable (different resolutions)
h3.gridDistance("81283ffffffffff", "8029fffffffffff");
}
@Test(expected = H3Exception.class)
public void testH3DistanceFailedPentagonDistortion() {
// This fails because of a limitation in the H3 core library.
// It cannot find distances from opposite sides of a pentagon.
// Expected correct result is 9.
h3.gridDistance("821c37fffffffff", "822837fffffffff");
}
@Test
public void testH3Distance() {
// Resolution 0 to some neighbors
assertEquals(0, h3.gridDistance("8029fffffffffff", "8029fffffffffff"));
assertEquals(1, h3.gridDistance("8029fffffffffff", "801dfffffffffff"));
assertEquals(1, h3.gridDistance("8029fffffffffff", "8037fffffffffff"));
// Resolution 1 from a base cell onto a pentagon
assertEquals(2, h3.gridDistance("81283ffffffffff", "811d7ffffffffff"));
assertEquals(2, h3.gridDistance("81283ffffffffff", "811cfffffffffff"));
assertEquals(3, h3.gridDistance("81283ffffffffff", "811c3ffffffffff"));
// Resolution 5 within the same base cell
assertEquals(0, h3.gridDistance("85283083fffffff", "85283083fffffff"));
assertEquals(1, h3.gridDistance("85283083fffffff", "85283093fffffff"));
assertEquals(2, h3.gridDistance("85283083fffffff", "8528342bfffffff"));
assertEquals(3, h3.gridDistance("85283083fffffff", "85283477fffffff"));
assertEquals(4, h3.gridDistance("85283083fffffff", "85283473fffffff"));
assertEquals(5, h3.gridDistance("85283083fffffff", "85283447fffffff"));
}
@Test(expected = H3Exception.class)
public void testDistanceAcrossPentagon() {
// Opposite sides of a pentagon.
h3.gridDistance("81283ffffffffff", "811dbffffffffff");
}
@Test(expected = H3Exception.class)
public void testCellToLocalIjNoncomparable() {
h3.cellToLocalIj("832830fffffffff", "822837fffffffff");
}
@Test(expected = H3Exception.class)
public void testCellToLocalIjTooFar() {
h3.cellToLocalIj("822a17fffffffff", "822837fffffffff");
}
@Test(expected = H3Exception.class)
public void testCellToLocalIjPentagonDistortion() {
h3.cellToLocalIj("81283ffffffffff", "811cbffffffffff");
}
@Test
public void testCellToLocalIjPentagon() {
final String origin = "811c3ffffffffff";
assertEquals(new CoordIJ(0, 0), h3.cellToLocalIj(origin, origin));
assertEquals(new CoordIJ(1, 0), h3.cellToLocalIj(origin, "811d3ffffffffff"));
assertEquals(new CoordIJ(-1, 0), h3.cellToLocalIj(origin, "811cfffffffffff"));
}
@Test
public void testCellToLocalIjHexagons() {
final String origin = "8828308281fffff";
assertEquals(new CoordIJ(392, 336), h3.cellToLocalIj(origin, origin));
assertEquals(new CoordIJ(387, 336), h3.cellToLocalIj(origin, "88283080c3fffff"));
assertEquals(new CoordIJ(392, -14), h3.cellToLocalIj(origin, "8828209581fffff"));
}
@Test
public void testLocalIjToCellPentagon() {
final String origin = "811c3ffffffffff";
assertEquals(origin, h3.localIjToCell(origin, new CoordIJ(0, 0)));
assertEquals("811d3ffffffffff", h3.localIjToCell(origin, new CoordIJ(1, 0)));
assertEquals("811cfffffffffff", h3.localIjToCell(origin, new CoordIJ(-1, 0)));
}
@Test(expected = H3Exception.class)
public void testLocalIjToCellTooFar() {
h3.localIjToCell("8049fffffffffff", new CoordIJ(2, 0));
}
@Test
public void testH3Line() {
for (int res = 0; res < 12; res++) {
String origin = h3.latLngToCellAddress(37.5, -122, res);
String destination = h3.latLngToCellAddress(25, -120, res);
List<String> line = h3.gridPathCells(origin, destination);
long distance = h3.gridDistance(origin, destination);
// Need to add 1 to account for the origin as well
assertEquals("Distance matches expected", distance + 1, line.size());
for (int i = 1; i < line.size(); i++) {
assertTrue(
"Every index in the line is a neighbor of the previous",
h3.areNeighborCells(line.get(i - 1), line.get(i)));
}
assertTrue("Line contains start", line.contains(origin));
assertTrue("Line contains destination", line.contains(destination));
}
}
@Test(expected = H3Exception.class)
public void testH3LineFailed() {
long origin = h3.latLngToCell(37.5, -122, 9);
long destination = h3.latLngToCell(37.5, -122, 10);
h3.gridPathCells(origin, destination);
}
}