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h3core.spec.js
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h3core.spec.js
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/*
* Copyright 2018-2019, 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.
*/
import test from 'tape';
import * as h3 from '../lib/h3core';
import {
E_FAILED,
E_DOMAIN,
E_LATLNG_DOMAIN,
E_RES_DOMAIN,
E_CELL_INVALID,
E_DIR_EDGE_INVALID,
E_PENTAGON,
E_DUPLICATE_INPUT,
E_NOT_NEIGHBORS,
E_RES_MISMATCH,
E_UNKNOWN_UNIT,
E_ARRAY_LENGTH
} from '../lib/errors';
const GEO_PRECISION = 12;
function toLowPrecision(maybeNumber) {
if (typeof maybeNumber === 'number') {
return Number(maybeNumber.toPrecision(GEO_PRECISION));
}
if (Array.isArray(maybeNumber)) {
return maybeNumber.map(toLowPrecision);
}
throw new Error(`Unhandled type: ${maybeNumber}`);
}
function almostEqual(a, b, factor = 1e-6) {
return Math.abs(a - b) < a * factor;
}
// Assert a vertex loop regardless of starting vertex
function assertLoop(assert, loop, expected, isGeoJSON) {
// Drop the repeated vertex if GeoJSON
if (isGeoJSON) {
loop = loop.slice(0, -1);
}
// Find the start index
const index = loop.findIndex(
vertex => toLowPrecision(vertex).join(',') === toLowPrecision(expected[0]).join(',')
);
assert.ok(index >= 0, 'Found start index in loop');
// Wrap the loop to the right start index
loop = loop.slice(index).concat(loop.slice(0, index));
// Close GeoJSON loops
if (isGeoJSON) {
loop.push(loop[0]);
}
assert.deepEqual(loop, expected, 'Got expected loop (independent of starting vertex)');
}
function assertPolygon(assert, input, expected, isGeoJSON) {
assert.equal(input.length, expected.length, 'Polygon has expected number of loops');
for (let i = 0; i < input.length; i++) {
assertLoop(assert, input[i], expected[i], isGeoJSON);
}
}
function assertMultiPolygon(assert, input, expected, isGeoJSON) {
assert.equal(input.length, expected.length, 'MultiPolygon has expected number of polygons');
for (let i = 0; i < input.length; i++) {
assertPolygon(assert, input[i], expected[i], isGeoJSON);
}
}
test('isValidCell', assert => {
assert.ok(h3.isValidCell('85283473fffffff'), 'H3 index is considered an index');
assert.ok(h3.isValidCell('821C37FFFFFFFFF'), 'H3 index in upper case is considered an index');
assert.ok(
h3.isValidCell('085283473fffffff'),
'H3 index with leading zero is considered an index'
);
assert.ok(
!h3.isValidCell('ff283473fffffff'),
'Hexidecimal string with incorrect bits is not valid'
);
assert.ok(!h3.isValidCell('85283q73fffffff'), 'String with non-hexidecimal chars is not valid');
assert.ok(
!h3.isValidCell('85283473fffffff112233'),
'String with additional parsed chars is not valid'
);
assert.ok(
!h3.isValidCell('85283473fffffff_lolwut'),
'String with additional unparsed chars is not valid'
);
assert.ok(
!h3.isValidCell('8a283081f1f1f1f1f1f5505ffff'),
'String with extraneous parsable characters in the middle is not valid'
);
assert.ok(
!h3.isValidCell('8a28308_hello_world_5505ffff'),
'String with extraneous unparsable characters in the middle is not valid'
);
assert.ok(!h3.isValidCell('lolwut'), 'Random string is not considered an index');
assert.ok(!h3.isValidCell(null), 'Null is not considered an index');
assert.ok(!h3.isValidCell(), 'Undefined is not considered an index');
assert.ok(!h3.isValidCell({}), 'Object is not considered an index');
for (let res = 0; res < 16; res++) {
assert.ok(
h3.isValidCell(h3.latLngToCell(37, -122, res)),
'H3 index is considered an index'
);
}
assert.end();
});
test('isValidCell split long', assert => {
assert.ok(h3.isValidCell([0x3fffffff, 0x8528347]), 'Integer H3 index is considered an index');
assert.ok(
!h3.isValidCell([0x73fffffff, 0xff2834]),
'Integer with incorrect bits is not considered an index'
);
assert.ok(!h3.isValidCell([]), 'Empty array is not valid');
assert.ok(!h3.isValidCell([1]), 'Array with a single element is not valid');
assert.ok(
!h3.isValidCell([0x3fffffff, 0x8528347, 0]),
'Array with an additional element is not valid'
);
assert.end();
});
test('latLngToCell', assert => {
const h3Index = h3.latLngToCell(37.3615593, -122.0553238, 5);
assert.equal(h3Index, '85283473fffffff', 'Got the expected H3 index back');
const ffffffffAddress = h3.latLngToCell(30.943387, -164.991559, 5);
assert.equal(ffffffffAddress, '8547732ffffffff', 'Properly handle 8 Fs');
const centralAddress = h3.latLngToCell(46.04189431883772, 71.52790329909925, 15);
assert.equal(centralAddress, '8f2000000000000', 'Properly handle leading zeros');
assert.end();
});
test('latLngToCell - longitude wrapping', assert => {
const h3Index = h3.latLngToCell(37.3615593, -122.0553238 + 360.0, 5);
assert.equal(h3Index, '85283473fffffff', 'world-wrapping lng accepted');
assert.end();
});
test('latLngToCell - invalid lat/lng', assert => {
assert.throws(
() => h3.latLngToCell(Infinity, 0, 5),
{code: E_LATLNG_DOMAIN},
'non-finite lat throws'
);
assert.throws(
() => h3.latLngToCell(0, Infinity, 5),
{code: E_LATLNG_DOMAIN},
'non-finite lng throws'
);
assert.throws(
() => h3.latLngToCell(NaN, 0, 5),
{code: E_LATLNG_DOMAIN},
'non-finite lat throws'
);
assert.throws(
() => h3.latLngToCell('spam', 0, 5),
{code: E_LATLNG_DOMAIN},
'non-numeric lat throws'
);
assert.throws(() => h3.latLngToCell(0, NaN, 5), {code: E_LATLNG_DOMAIN}, 'NaN lng throws');
assert.end();
});
test('getResolution', assert => {
assert.equal(h3.getResolution(), -1, 'Got an invalid resolution back with no query');
for (let res = 0; res < 16; res++) {
const h3Index = h3.latLngToCell(37.3615593, -122.0553238, res);
assert.equal(h3.getResolution(h3Index), res, 'Got the expected resolution back');
}
assert.end();
});
test('getResolution - integers', assert => {
for (let res = 0; res < 16; res++) {
// Same as in h3GetResolution above
const h3Index = h3.latLngToCell(37.3615593, -122.0553238, res);
const h3IndexInt = h3.h3IndexToSplitLong(h3Index);
assert.equal(h3.getResolution(h3IndexInt), res, 'Got the expected resolution back for int');
}
assert.end();
});
test('cellToLatLng', assert => {
const latlng = h3.cellToLatLng('85283473fffffff');
assert.deepEqual(
toLowPrecision(latlng),
toLowPrecision([37.34579337536848, -121.97637597255124]),
'lat/lng matches expected'
);
assert.end();
});
test('cellToLatLng - Integer', assert => {
const latlng = h3.cellToLatLng([0x3fffffff, 0x8528347]);
assert.deepEqual(
toLowPrecision(latlng),
toLowPrecision([37.34579337536848, -121.97637597255124]),
'lat/lng matches expected'
);
assert.end();
});
test('cellToBoundary', assert => {
const latlngs = h3.cellToBoundary('85283473fffffff');
const expectedlatlngs = [
[37.271355866731895, -121.91508032705622],
[37.353926450852256, -121.86222328902491],
[37.42834118609435, -121.9235499963016],
[37.42012867767778, -122.0377349642703],
[37.33755608435298, -122.09042892904395],
[37.26319797461824, -122.02910130919]
];
assert.deepEqual(
toLowPrecision(latlngs),
toLowPrecision(expectedlatlngs),
'Coordinates match expected'
);
assert.end();
});
test('cellToBoundary - GeoJson', assert => {
const latlngs = h3.cellToBoundary('85283473fffffff', true);
const expectedlatlngs = [
[37.271355866731895, -121.91508032705622].reverse(),
[37.353926450852256, -121.86222328902491].reverse(),
[37.42834118609435, -121.9235499963016].reverse(),
[37.42012867767778, -122.0377349642703].reverse(),
[37.33755608435298, -122.09042892904395].reverse(),
[37.26319797461824, -122.02910130919].reverse(),
// Repeat first point
[37.271355866731895, -121.91508032705622].reverse()
];
assert.deepEqual(
toLowPrecision(latlngs),
toLowPrecision(expectedlatlngs),
'Coordinates match expected'
);
assert.end();
});
test('cellToBoundary - 10-Vertex Pentagon', assert => {
const latlngs = h3.cellToBoundary('81623ffffffffff', true);
const expectedlatlngs = [
[55.94007484027041, 12.754829243237465],
[55.178175815407634, 10.2969712998247],
[55.25056228923789, 9.092686031788569],
[57.37516125699395, 7.616228186063625],
[58.549882762724735, 7.302087248609307],
[60.638711932789995, 8.825639091130396],
[61.315435771664646, 9.83036925628956],
[60.502253257733344, 12.271971757766304],
[59.732575088573185, 13.216340916028171],
[57.09422515125156, 13.191260467897605],
// Repeat first point
[55.94007484027041, 12.754829243237465]
];
assert.deepEqual(
toLowPrecision(latlngs),
toLowPrecision(expectedlatlngs),
'Coordinates match expected'
);
assert.end();
});
test('gridDisk', assert => {
const hexagons = h3.gridDisk('8928308280fffff', 1);
assert.equal(1 + 6, hexagons.length, 'got the expected number of hexagons for a single ring');
[
'8928308280fffff',
'8928308280bffff',
'89283082807ffff',
'89283082877ffff',
'89283082803ffff',
'89283082873ffff',
'8928308283bffff'
].forEach(hexagonAddress => {
assert.ok(hexagons.indexOf(hexagonAddress) > -1, 'found an expected hexagon');
});
assert.end();
});
test('gridDisk 2', assert => {
const hexagons = h3.gridDisk('8928308280fffff', 2);
assert.equal(1 + 6 + 12, hexagons.length, 'got the expected number of hexagons for two rings');
[
'89283082813ffff',
'89283082817ffff',
'8928308281bffff',
'89283082863ffff',
'89283082823ffff',
'89283082873ffff',
'89283082877ffff',
'8928308287bffff',
'89283082833ffff',
'8928308282bffff',
'8928308283bffff',
'89283082857ffff',
'892830828abffff',
'89283082847ffff',
'89283082867ffff',
'89283082803ffff',
'89283082807ffff',
'8928308280bffff',
'8928308280fffff'
].forEach(hexagonAddress => {
assert.ok(hexagons.indexOf(hexagonAddress) > -1, 'found an expected hexagon');
});
assert.end();
});
test('gridDisk - Bad Radius', assert => {
assert.throws(
() => h3.gridDisk('8928308280fffff', -7),
{code: E_DOMAIN},
'Throws with bad radius'
);
assert.end();
});
test('gridDisk - out of bounds', assert => {
assert.throws(
() => h3.gridDisk(['8928308280fffff'], 1e6),
{code: E_ARRAY_LENGTH},
'throws if the output is too large'
);
assert.end();
});
test('gridDisk - Pentagon', assert => {
const hexagons = h3.gridDisk('821c07fffffffff', 1);
assert.equal(
1 + 5,
hexagons.length,
'got the expected number for a single ring around a pentagon'
);
[
'821c2ffffffffff',
'821c27fffffffff',
'821c07fffffffff',
'821c17fffffffff',
'821c1ffffffffff',
'821c37fffffffff'
].forEach(hexagonAddress => {
assert.ok(hexagons.indexOf(hexagonAddress) > -1, 'found an expected hexagon');
});
assert.end();
});
test('gridDisk - Edge case', assert => {
// There was an issue reading particular 64-bit integers correctly, this kRing ran into it
const hexagons = h3.gridDisk('8928308324bffff', 1);
assert.equal(1 + 6, hexagons.length, 'got the expected number of hexagons');
[
'8928308324bffff',
'892830989b3ffff',
'89283098987ffff',
'89283098997ffff',
'8928308325bffff',
'89283083243ffff',
'8928308324fffff'
].forEach(hexagonAddress => {
assert.ok(hexagons.indexOf(hexagonAddress) > -1, 'found an expected hexagon');
});
assert.end();
});
test('gridDiskDistances', assert => {
const hexagons = h3.gridDiskDistances('8928308280fffff', 1);
assert.equal(1, hexagons[0].length, 'got the expected number of hexagons for the origin');
assert.equal(6, hexagons[1].length, 'got the expected number of hexagons for ring 1');
assert.deepEqual(hexagons[0], ['8928308280fffff'], 'Got origin in ring 0');
[
'8928308280bffff',
'89283082807ffff',
'89283082877ffff',
'89283082803ffff',
'89283082873ffff',
'8928308283bffff'
].forEach(hexagonAddress => {
assert.ok(hexagons[1].indexOf(hexagonAddress) > -1, 'found an expected hexagon');
});
assert.end();
});
test('gridDiskDistances - 2 rings', assert => {
const hexagons = h3.gridDiskDistances('8928308280fffff', 2);
assert.equal(1, hexagons[0].length, 'got the expected number of hexagons for the origin');
assert.equal(6, hexagons[1].length, 'got the expected number of hexagons for ring 1');
assert.equal(12, hexagons[2].length, 'got the expected number of hexagons for ring 1');
assert.deepEqual(hexagons[0], ['8928308280fffff'], 'Got origin in ring 0');
[
'8928308280bffff',
'89283082807ffff',
'89283082877ffff',
'89283082803ffff',
'89283082873ffff',
'8928308283bffff'
].forEach(hexagonAddress => {
assert.ok(hexagons[1].indexOf(hexagonAddress) > -1, 'found an expected hexagon');
});
[
'89283082813ffff',
'89283082817ffff',
'8928308281bffff',
'89283082863ffff',
'89283082823ffff',
'8928308287bffff',
'89283082833ffff',
'8928308282bffff',
'89283082857ffff',
'892830828abffff',
'89283082847ffff',
'89283082867ffff'
].forEach(hexagonAddress => {
assert.ok(hexagons[2].indexOf(hexagonAddress) > -1, 'found an expected hexagon');
});
assert.end();
});
test('gridDiskDistances - Pentagon', assert => {
const hexagons = h3.gridDiskDistances('821c07fffffffff', 1);
assert.equal(1, hexagons[0].length, 'got the expected number of hexagons for the origin');
assert.equal(
5,
hexagons[1].length,
'got the expected number of hexagons for a ring around a pentagon'
);
assert.deepEqual(hexagons[0], ['821c07fffffffff'], 'Got origin in ring 0');
[
'821c2ffffffffff',
'821c27fffffffff',
'821c17fffffffff',
'821c1ffffffffff',
'821c37fffffffff'
].forEach(hexagonAddress => {
assert.ok(hexagons[1].indexOf(hexagonAddress) > -1, 'found an expected hexagon');
});
assert.end();
});
test('gridDiskDistances - out of bounds', assert => {
assert.throws(
() => h3.gridDiskDistances(['8928308280fffff'], 1e6),
{code: E_ARRAY_LENGTH},
'throws if the output is too large'
);
assert.end();
});
test('gridRingUnsafe', assert => {
const hexagons = h3.gridRingUnsafe('8928308280fffff', 1);
assert.equal(6, hexagons.length, 'got the expected number of hexagons for ring 1');
[
'8928308280bffff',
'89283082807ffff',
'89283082877ffff',
'89283082803ffff',
'89283082873ffff',
'8928308283bffff'
].forEach(hexagonAddress => {
assert.ok(hexagons.indexOf(hexagonAddress) > -1, 'found an expected hexagon');
});
assert.end();
});
test('gridRingUnsafe - ring 2', assert => {
const hexagons = h3.gridRingUnsafe('8928308280fffff', 2);
assert.equal(12, hexagons.length, 'got the expected number of hexagons for ring 1');
[
'89283082813ffff',
'89283082817ffff',
'8928308281bffff',
'89283082863ffff',
'89283082823ffff',
'8928308287bffff',
'89283082833ffff',
'8928308282bffff',
'89283082857ffff',
'892830828abffff',
'89283082847ffff',
'89283082867ffff'
].forEach(hexagonAddress => {
assert.ok(hexagons.indexOf(hexagonAddress) > -1, 'found an expected hexagon');
});
assert.end();
});
test('gridRingUnsafe - ring 0', assert => {
const hexagons = h3.gridRingUnsafe('8928308280fffff', 0);
assert.deepEqual(hexagons, ['8928308280fffff'], 'Got origin in ring 0');
assert.end();
});
test('gridRingUnsafe - pentagon', assert => {
assert.throws(
() => h3.gridRingUnsafe('821c07fffffffff', 2),
{code: E_PENTAGON},
'Throws with a pentagon origin'
);
assert.throws(
() => h3.gridRingUnsafe('821c2ffffffffff', 1),
{code: E_PENTAGON},
'Throws with a pentagon in the ring itself'
);
assert.throws(
() => h3.gridRingUnsafe('821c2ffffffffff', 5),
{code: E_PENTAGON},
'Throws with a pentagon inside the ring'
);
assert.end();
});
test('polygonToCells', assert => {
const hexagons = h3.polygonToCells(
[
[
[37.813318999983238, -122.4089866999972145],
[37.7866302000007224, -122.3805436999997056],
[37.7198061999978478, -122.3544736999993603],
[37.7076131999975672, -122.5123436999983966],
[37.7835871999971715, -122.5247187000021967],
[37.8151571999998453, -122.4798767000009008]
]
],
9
);
assert.equal(hexagons.length, 1253, 'got an appropriate number of hexagons back');
assert.end();
});
test('polygonToCells - GeoJson', assert => {
const hexagons = h3.polygonToCells(
[
[
[-122.4089866999972145, 37.813318999983238],
[-122.3805436999997056, 37.7866302000007224],
[-122.3544736999993603, 37.7198061999978478],
[-122.5123436999983966, 37.7076131999975672],
[-122.5247187000021967, 37.7835871999971715],
[-122.4798767000009008, 37.8151571999998453]
]
],
9,
true
);
assert.equal(hexagons.length, 1253, 'got an appropriate number of hexagons back');
assert.end();
});
test('polygonToCells - Single Loop', assert => {
const hexagons = h3.polygonToCells(
[
[37.813318999983238, -122.4089866999972145],
[37.7866302000007224, -122.3805436999997056],
[37.7198061999978478, -122.3544736999993603],
[37.7076131999975672, -122.5123436999983966],
[37.7835871999971715, -122.5247187000021967],
[37.8151571999998453, -122.4798767000009008]
],
9
);
assert.equal(hexagons.length, 1253, 'got an appropriate number of hexagons back');
assert.end();
});
test('polygonToCells - Single Loop GeoJson', assert => {
const hexagons = h3.polygonToCells(
[
[-122.4089866999972145, 37.813318999983238],
[-122.3805436999997056, 37.7866302000007224],
[-122.3544736999993603, 37.7198061999978478],
[-122.5123436999983966, 37.7076131999975672],
[-122.5247187000021967, 37.7835871999971715],
[-122.4798767000009008, 37.8151571999998453]
],
9,
true
);
assert.equal(hexagons.length, 1253, 'got an appropriate number of hexagons back');
assert.end();
});
test('polygonToCells - Single Loop Transmeridian', assert => {
const hexagons = h3.polygonToCells(
[
[0.5729577951308232, -179.4270422048692],
[0.5729577951308232, 179.4270422048692],
[-0.5729577951308232, 179.4270422048692],
[-0.5729577951308232, -179.4270422048692]
],
7
);
assert.equal(hexagons.length, 4238, 'got an appropriate number of hexagons back');
assert.end();
});
test('polygonToCells - Empty', assert => {
const hexagons = h3.polygonToCells([], 9);
assert.equal(hexagons.length, 0, 'got no hexagons back');
assert.end();
});
test('polygonToCells - Empty Loop', assert => {
const hexagons = h3.polygonToCells([[]], 9);
assert.equal(hexagons.length, 0, 'got no hexagons back');
assert.end();
});
test('polygonToCells - Bad Input', assert => {
assert.throws(() => h3.polygonToCells([]), {code: E_RES_DOMAIN});
assert.throws(() => h3.polygonToCells([], 42), {code: E_RES_DOMAIN});
assert.throws(() => h3.polygonToCells([], null), {code: E_RES_DOMAIN});
// These throw simple JS errors, probably fine for now
assert.throws(() => h3.polygonToCells(null, 9));
assert.throws(() => h3.polygonToCells(undefined, 9));
assert.throws(() => h3.polygonToCells({}, 9));
assert.end();
});
test('polygonToCells - out of bounds', assert => {
const polygon = [
[85, 85],
[85, -85],
[-85, -85],
[-85, 85],
[85, 85]
];
assert.throws(
() => h3.polygonToCells(polygon, 15),
{code: E_ARRAY_LENGTH},
'throws if expected output is too large'
);
assert.end();
});
test('polygonToCells - With Hole', assert => {
const hexagons = h3.polygonToCells(
[
[
[37.813318999983238, -122.4089866999972145],
[37.7866302000007224, -122.3805436999997056],
[37.7198061999978478, -122.3544736999993603],
[37.7076131999975672, -122.5123436999983966],
[37.7835871999971715, -122.5247187000021967],
[37.8151571999998453, -122.4798767000009008]
],
[
[37.7869802, -122.4471197],
[37.7664102, -122.4590777],
[37.7710682, -122.4137097]
]
],
9
);
assert.equal(hexagons.length, 1214, 'got an appropriate number of hexagons back');
assert.end();
});
test('polygonToCells - With Hole GeoJson', assert => {
const hexagons = h3.polygonToCells(
[
[
[-122.4089866999972145, 37.813318999983238],
[-122.3805436999997056, 37.7866302000007224],
[-122.3544736999993603, 37.7198061999978478],
[-122.5123436999983966, 37.7076131999975672],
[-122.5247187000021967, 37.7835871999971715],
[-122.4798767000009008, 37.8151571999998453]
],
[
[-122.4471197, 37.7869802],
[-122.4590777, 37.7664102],
[-122.4137097, 37.7710682]
]
],
9,
true
);
assert.equal(hexagons.length, 1214, 'got an appropriate number of hexagons back');
assert.end();
});
test('polygonToCells - With Two Holes', assert => {
const hexagons = h3.polygonToCells(
[
[
[37.813318999983238, -122.4089866999972145],
[37.7866302000007224, -122.3805436999997056],
[37.7198061999978478, -122.3544736999993603],
[37.7076131999975672, -122.5123436999983966],
[37.7835871999971715, -122.5247187000021967],
[37.8151571999998453, -122.4798767000009008]
],
[
[37.7869802, -122.4471197],
[37.7664102, -122.4590777],
[37.7710682, -122.4137097]
],
[
[37.747976, -122.490025],
[37.73155, -122.503758],
[37.72544, -122.452603]
]
],
9
);
assert.equal(hexagons.length, 1172, 'got an appropriate number of hexagons back');
assert.end();
});
test('polygonToCells - BBox corners (#67)', assert => {
const {north, south, east, west} = {
east: -56.25,
north: -33.13755119234615,
south: -34.30714385628804,
west: -57.65625
};
const vertices = [
[north, east],
[north, west],
[south, west],
[south, east]
];
const hexagons = h3.polygonToCells(vertices, 7);
assert.equal(hexagons.length, 4499, 'got the expected number of hexagons back');
assert.end();
});
// Helper - make a polygon from a unit circle with an arbitrary number of vertices
function makePolygon(numVerts, radius = 1) {
const interval = (2 * Math.PI) / numVerts;
const polygon = [];
for (let i = 0; i < numVerts; i++) {
const theta = interval * i;
polygon.push([radius * Math.cos(theta), radius * Math.sin(theta)]);
}
return polygon;
}
test('polygonToCells - memory management bug (#103)', assert => {
// Note that when this memory mangement issue occurs, it makes a number of *other* tests fail.
// Unfortunately this test itself doesn't seem to fail, though the original pair of polygons
// in #103 failed deterministically with this length check.
const simplePolygon = makePolygon(4);
const complexPolygon = makePolygon(1260);
const len1 = h3.polygonToCells(simplePolygon, 3).length;
h3.polygonToCells(complexPolygon, 3);
const len2 = h3.polygonToCells(simplePolygon, 3).length;
assert.equal(
len1,
len2,
'polygonToCells with many vertexes should not mess up later polyfills'
);
assert.end();
});
test('polygonToCells - memory management bug (#103, holes)', assert => {
const simplePolygon = makePolygon(4);
const complexPolygon = [simplePolygon, makePolygon(1260, 0.5), makePolygon(2000, 0.5)];
const len1 = h3.polygonToCells(simplePolygon, 3).length;
h3.polygonToCells(complexPolygon, 3);
const len2 = h3.polygonToCells(simplePolygon, 3).length;
assert.equal(
len1,
len2,
'polygonToCells with many vertexes should not mess up later polyfills'
);
assert.end();
});
test('cellsToMultiPolygon - Empty', assert => {
const h3Indexes = [];
const multiPolygon = h3.cellsToMultiPolygon(h3Indexes);
assert.deepEqual(multiPolygon, [], 'no hexagons yields an empty array');
assert.end();
});
test('cellsToMultiPolygon - Single', assert => {
const h3Indexes = ['89283082837ffff'];
const multiPolygon = h3.cellsToMultiPolygon(h3Indexes);
const vertices = h3.cellToBoundary(h3Indexes[0]);
const expected = [[vertices]];
assertMultiPolygon(assert, multiPolygon, expected);
assert.end();
});
test('cellsToMultiPolygon - Single GeoJson', assert => {
const h3Indexes = ['89283082837ffff'];
const multiPolygon = h3.cellsToMultiPolygon(h3Indexes, true);
const vertices = h3.cellToBoundary(h3Indexes[0], true);
const expected = [[vertices]];
assertMultiPolygon(assert, multiPolygon, expected, true);
assert.end();
});
test('cellsToMultiPolygon - Contiguous 2', assert => {
// the second hexagon shares v0 and v1 with the first
const h3Indexes = ['89283082837ffff', '89283082833ffff'];
const multiPolygon = h3.cellsToMultiPolygon(h3Indexes);
const vertices0 = h3.cellToBoundary(h3Indexes[0]);
const vertices1 = h3.cellToBoundary(h3Indexes[1]);
const expected = [
[
[
vertices1[0],
vertices1[1],
vertices1[2],
vertices0[1],
vertices0[2],
vertices0[3],
vertices0[4],
vertices0[5],
vertices1[4],
vertices1[5]
]
]
];
assertMultiPolygon(assert, multiPolygon, expected);
assert.end();
});
test('cellsToMultiPolygon - Non-contiguous 2', assert => {
// the second hexagon does not touch the first
const h3Indexes = ['89283082837ffff', '8928308280fffff'];
const multiPolygon = h3.cellsToMultiPolygon(h3Indexes);
const vertices0 = h3.cellToBoundary(h3Indexes[0]);
const vertices1 = h3.cellToBoundary(h3Indexes[1]);
const expected = [[vertices0], [vertices1]];
assertMultiPolygon(assert, multiPolygon, expected);
assert.end();
});
test('cellsToMultiPolygon - Hole', assert => {
// Six hexagons in a ring around a hole
const h3Indexes = [
'892830828c7ffff',
'892830828d7ffff',
'8928308289bffff',
'89283082813ffff',
'8928308288fffff',
'89283082883ffff'
];
const multiPolygon = h3.cellsToMultiPolygon(h3Indexes);
assert.equal(multiPolygon.length, 1, 'polygon count matches expected');
assert.equal(multiPolygon[0].length, 2, 'loop count matches expected');
assert.equal(multiPolygon[0][0].length, 6 * 3, 'outer coord count matches expected');
assert.equal(multiPolygon[0][1].length, 6, 'inner coord count matches expected');
assert.end();
});
test('cellsToMultiPolygon - kRing', assert => {
// 2-ring in order returned by algo
let h3Indexes = h3.gridDisk('8930062838bffff', 2);
let multiPolygon = h3.cellsToMultiPolygon(h3Indexes);
assert.equal(multiPolygon.length, 1, 'polygon count matches expected');
assert.equal(multiPolygon[0].length, 1, 'loop count matches expected');
assert.equal(multiPolygon[0][0].length, 6 * (2 * 2 + 1), 'coord count matches expected');
// Same k-ring in random order
h3Indexes = [
'89300628393ffff',
'89300628383ffff',
'89300628397ffff',
'89300628067ffff',
'89300628387ffff',
'893006283bbffff',
'89300628313ffff',
'893006283cfffff',
'89300628303ffff',
'89300628317ffff',
'8930062839bffff',
'8930062838bffff',
'8930062806fffff',
'8930062838fffff',
'893006283d3ffff',
'893006283c3ffff',
'8930062831bffff',
'893006283d7ffff',
'893006283c7ffff'
];
multiPolygon = h3.cellsToMultiPolygon(h3Indexes);
assert.equal(multiPolygon.length, 1, 'polygon count matches expected');
assert.equal(multiPolygon[0].length, 1, 'loop count matches expected');
assert.equal(multiPolygon[0][0].length, 6 * (2 * 2 + 1), 'coord count matches expected');
h3Indexes = h3.gridDisk('8930062838bffff', 6).sort();
multiPolygon = h3.cellsToMultiPolygon(h3Indexes);
assert.equal(multiPolygon[0].length, 1, 'loop count matches expected');
assert.end();
});
test('cellsToMultiPolygon - Nested Donuts', assert => {
const origin = '892830828c7ffff';
const h3Indexes = h3.gridRingUnsafe(origin, 1).concat(h3.gridRingUnsafe(origin, 3));
const multiPolygon = h3.cellsToMultiPolygon(h3Indexes);
// This assertion is brittle, as the order of polygons is undefined, and it would
// be equally correct if the smaller ring was first
assert.equal(multiPolygon.length, 2, 'polygon count matches expected');
assert.equal(multiPolygon[0].length, 2, 'loop count matches expected');
assert.equal(multiPolygon[0][0].length, 6 * 7, 'outer coord count matches expected');
assert.equal(multiPolygon[0][1].length, 6 * 5, 'inner coord count matches expected');
assert.equal(multiPolygon[1].length, 2, 'loop count matches expected');
assert.equal(multiPolygon[1][0].length, 6 * 3, 'outer coord count matches expected');
assert.equal(multiPolygon[1][1].length, 6, 'inner coord count matches expected');
assert.end();
});
test('compactCells and uncompactCells', assert => {
const hexagons = h3.polygonToCells(
[
[
[37.813318999983238, -122.4089866999972145],
[37.7866302000007224, -122.3805436999997056],
[37.7198061999978478, -122.3544736999993603],
[37.7076131999975672, -122.5123436999983966],
[37.7835871999971715, -122.5247187000021967],
[37.8151571999998453, -122.4798767000009008]
]
],
9
);
const compactedHexagons = h3.compactCells(hexagons);
assert.equal(compactedHexagons.length, 209, 'got an appropriate number of hexagons back');
const uncompactedHexagons = h3.uncompactCells(compactedHexagons, 9);
assert.equal(uncompactedHexagons.length, 1253, 'got an appropriate number of hexagons back');
assert.end();
});
test('compactCells - Empty', assert => {
assert.deepEqual(h3.compactCells(), [], 'got an empty array for an undefined input');
assert.deepEqual(h3.compactCells(null), [], 'got an empty array for a falsy input');
assert.deepEqual(h3.compactCells([]), [], 'got an empty array for an empty input');
assert.deepEqual(h3.compactCells({}), [], 'got an empty array for an invalid input');
assert.end();
});
test('compactCells - Res 0 edge case, issue #159', assert => {
// k-ring around a res 0 pentagon
const cells = h3.gridDisk('820807fffffffff', 4);
const compacted = h3.compactCells(cells);
assert.equal(compacted.length, 11, 'got an appropriate number of hexagons back');
assert.end();
});
test('uncompactCells - Empty', assert => {