openlayers
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Build tools and sources for developing OpenLayers based mapping applications
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JavaScript
goog.provide('ol.test.proj');
goog.require('ol.proj');
goog.require('ol.proj.EPSG4326');
goog.require('ol.proj.Projection');
goog.require('ol.proj.common');
describe('ol.proj', function() {
afterEach(function() {
ol.proj.clearAllProjections();
ol.proj.common.add();
});
describe('projection equivalence', function() {
function _testAllEquivalent(codes) {
var projections = codes.map(ol.proj.get);
projections.forEach(function(source) {
projections.forEach(function(destination) {
expect(ol.proj.equivalent(source, destination)).to.be.ok();
});
});
}
it('gives that 3857, 102100, 102113, 900913 are equivalent ', function() {
_testAllEquivalent([
'EPSG:3857',
'EPSG:102100',
'EPSG:102113',
'EPSG:900913'
]);
});
it('gives that custom 3413 is equivalent to self', function() {
var code = 'EPSG:3413';
var source = new ol.proj.Projection({
code: code
});
var destination = new ol.proj.Projection({
code: code
});
expect(ol.proj.equivalent(source, destination)).to.be.ok();
});
it('gives that default 3857 is equivalent to self', function() {
_testAllEquivalent([
'EPSG:3857',
'EPSG:3857'
]);
});
it('gives that CRS:84, urn:ogc:def:crs:EPSG:6.6:4326, EPSG:4326 are ' +
'equivalent',
function() {
_testAllEquivalent([
'CRS:84',
'urn:ogc:def:crs:EPSG:6.6:4326',
'EPSG:4326'
]);
});
it('requires code and units to be equal for projection evquivalence',
function() {
var proj1 = new ol.proj.Projection({
code: 'EPSG:3857',
units: 'm'
});
var proj2 = new ol.proj.Projection({
code: 'EPSG:3857',
units: 'tile-pixels'
});
expect(ol.proj.equivalent(proj1, proj2)).to.not.be.ok();
});
});
describe('identify transform', function() {
it('returns a new object, with same coord values', function() {
var epsg4326 = ol.proj.get('EPSG:4326');
var uniqueObject = {};
var sourcePoint = [uniqueObject, uniqueObject];
var destinationPoint = ol.proj.transform(
sourcePoint, epsg4326, epsg4326);
expect(sourcePoint === destinationPoint).to.not.be();
expect(destinationPoint[0] === sourcePoint[0]).to.be.ok();
expect(destinationPoint[1] === sourcePoint[1]).to.be.ok();
});
});
describe('transform 0,0 from 4326 to 3857', function() {
it('returns expected value', function() {
var point = ol.proj.transform([0, 0], 'EPSG:4326', 'EPSG:3857');
expect(point).not.to.be(undefined);
expect(point).not.to.be(null);
expect(point[1]).to.roughlyEqual(0, 1e-9);
});
});
describe('transform 0,0 from 3857 to 4326', function() {
it('returns expected value', function() {
var point = ol.proj.transform([0, 0], 'EPSG:3857', 'EPSG:4326');
expect(point).not.to.be(undefined);
expect(point).not.to.be(null);
expect(point[0]).to.eql(0);
expect(point[1]).to.eql(0);
});
});
describe('transform from 4326 to 3857 (Alastaira)', function() {
// http://alastaira.wordpress.com/2011/01/23/the-google-maps-bing-maps-spherical-mercator-projection/
it('returns expected value using ol.proj.transform', function() {
var point = ol.proj.transform(
[-5.625, 52.4827802220782], 'EPSG:4326', 'EPSG:900913');
expect(point).not.to.be(undefined);
expect(point).not.to.be(null);
expect(point[0]).to.roughlyEqual(-626172.13571216376, 1e-9);
expect(point[1]).to.roughlyEqual(6887893.4928337997, 1e-8);
});
it('returns expected value using ol.proj.fromLonLat', function() {
var point = ol.proj.fromLonLat([-5.625, 52.4827802220782]);
expect(point).not.to.be(undefined);
expect(point).not.to.be(null);
expect(point[0]).to.roughlyEqual(-626172.13571216376, 1e-9);
expect(point[1]).to.roughlyEqual(6887893.4928337997, 1e-8);
});
});
describe('transform from 3857 to 4326 (Alastaira)', function() {
// http://alastaira.wordpress.com/2011/01/23/the-google-maps-bing-maps-spherical-mercator-projection/
it('returns expected value using ol.proj.transform', function() {
var point = ol.proj.transform([-626172.13571216376, 6887893.4928337997],
'EPSG:900913', 'EPSG:4326');
expect(point).not.to.be(undefined);
expect(point).not.to.be(null);
expect(point[0]).to.roughlyEqual(-5.625, 1e-9);
expect(point[1]).to.roughlyEqual(52.4827802220782, 1e-9);
});
it('returns expected value using ol.proj.toLonLat', function() {
var point = ol.proj.toLonLat([-626172.13571216376, 6887893.4928337997]);
expect(point).not.to.be(undefined);
expect(point).not.to.be(null);
expect(point[0]).to.roughlyEqual(-5.625, 1e-9);
expect(point[1]).to.roughlyEqual(52.4827802220782, 1e-9);
});
});
describe('canWrapX()', function() {
it('requires an extent for allowing wrapX', function() {
var proj = new ol.proj.Projection({
code: 'foo',
global: true
});
expect(proj.canWrapX()).to.be(false);
proj.setExtent([1, 2, 3, 4]);
expect(proj.canWrapX()).to.be(true);
proj = new ol.proj.Projection({
code: 'foo',
global: true,
extent: [1, 2, 3, 4]
});
expect(proj.canWrapX()).to.be(true);
proj.setExtent(null);
expect(proj.canWrapX()).to.be(false);
});
it('requires global to be true for allowing wrapX', function() {
var proj = new ol.proj.Projection({
code: 'foo',
extent: [1, 2, 3, 4]
});
expect(proj.canWrapX()).to.be(false);
proj.setGlobal(true);
expect(proj.canWrapX()).to.be(true);
proj = new ol.proj.Projection({
code: 'foo',
global: true,
extent: [1, 2, 3, 4]
});
expect(proj.canWrapX()).to.be(true);
proj.setGlobal(false);
expect(proj.canWrapX()).to.be(false);
});
});
describe('transformExtent()', function() {
it('transforms an extent given projection identifiers', function() {
var sourceExtent = [-15, -30, 45, 60];
var destinationExtent = ol.proj.transformExtent(
sourceExtent, 'EPSG:4326', 'EPSG:3857');
expect(destinationExtent).not.to.be(undefined);
expect(destinationExtent).not.to.be(null);
expect(destinationExtent[0])
.to.roughlyEqual(-1669792.3618991037, 1e-9);
expect(destinationExtent[2]).to.roughlyEqual(5009377.085697311, 1e-9);
expect(destinationExtent[1]).to.roughlyEqual(-3503549.843504376, 1e-8);
expect(destinationExtent[3]).to.roughlyEqual(8399737.889818361, 1e-8);
});
});
describe('Proj4js integration', function() {
var proj4 = window.proj4;
afterEach(function() {
delete proj4.defs['EPSG:21781'];
window.proj4 = proj4;
ol.proj.setProj4(window.proj4);
});
it('creates ol.proj.Projection instance from EPSG:21781', function() {
proj4.defs('EPSG:21781',
'+proj=somerc +lat_0=46.95240555555556 +lon_0=7.439583333333333 ' +
'+k_0=1 +x_0=600000 +y_0=200000 +ellps=bessel ' +
'+towgs84=674.374,15.056,405.346,0,0,0,0 +units=m +no_defs');
var proj = ol.proj.get('EPSG:21781');
expect(proj.getCode()).to.eql('EPSG:21781');
expect(proj.getUnits()).to.eql('m');
expect(proj.getMetersPerUnit()).to.eql(1);
});
it('can use an alternative namespace for proj4', function() {
var proj4 = window.proj4;
var proj4new = proj4;
delete window.proj4;
ol.proj.setProj4(proj4new);
proj4new.defs('EPSG:21781',
'+proj=somerc +lat_0=46.95240555555556 +lon_0=7.439583333333333 ' +
'+k_0=1 +x_0=600000 +y_0=200000 +ellps=bessel ' +
'+towgs84=674.374,15.056,405.346,0,0,0,0 +units=m +no_defs');
var proj = ol.proj.get('EPSG:21781');
expect(proj.getCode()).to.eql('EPSG:21781');
expect(proj.getUnits()).to.eql('m');
expect(proj.getMetersPerUnit()).to.eql(1);
});
it('creates ol.proj.Projection instance from EPSG:3739', function() {
proj4.defs('EPSG:3739',
'+proj=tmerc +lat_0=40.5 +lon_0=-110.0833333333333 +k=0.9999375 ' +
'+x_0=800000.0000101599 +y_0=99999.99998983997 +ellps=GRS80 ' +
'+towgs84=0,0,0,0,0,0,0 +units=us-ft +no_defs');
var proj = ol.proj.get('EPSG:3739');
expect(proj.getCode()).to.eql('EPSG:3739');
expect(proj.getUnits()).to.eql('us-ft');
expect(proj.getMetersPerUnit()).to.eql(1200 / 3937);
delete proj4.defs['EPSG:3739'];
});
it('allows Proj4js projections to be used transparently', function() {
var point = ol.proj.transform(
[-626172.13571216376, 6887893.4928337997], 'GOOGLE', 'WGS84');
expect(point[0]).to.roughlyEqual(-5.625, 1e-9);
expect(point[1]).to.roughlyEqual(52.4827802220782, 1e-9);
});
it('allows new Proj4js projections to be defined', function() {
proj4.defs('EPSG:21781',
'+proj=somerc +lat_0=46.95240555555556 +lon_0=7.439583333333333 ' +
'+k_0=1 +x_0=600000 +y_0=200000 +ellps=bessel ' +
'+towgs84=674.374,15.056,405.346,0,0,0,0 +units=m +no_defs');
var point = ol.proj.transform([7.439583333333333, 46.95240555555556],
'EPSG:4326', 'EPSG:21781');
expect(point[0]).to.roughlyEqual(600072.300, 1);
expect(point[1]).to.roughlyEqual(200146.976, 1);
});
it('works with ol.proj.fromLonLat and ol.proj.toLonLat', function() {
proj4.defs('EPSG:21781',
'+proj=somerc +lat_0=46.95240555555556 +lon_0=7.439583333333333 ' +
'+k_0=1 +x_0=600000 +y_0=200000 +ellps=bessel ' +
'+towgs84=674.374,15.056,405.346,0,0,0,0 +units=m +no_defs');
var lonLat = [7.439583333333333, 46.95240555555556];
var point = ol.proj.fromLonLat(lonLat, 'EPSG:21781');
expect(point[0]).to.roughlyEqual(600072.300, 1);
expect(point[1]).to.roughlyEqual(200146.976, 1);
point = ol.proj.toLonLat(point, 'EPSG:21781');
expect(point[0]).to.roughlyEqual(lonLat[0], 1);
expect(point[1]).to.roughlyEqual(lonLat[1], 1);
});
it('caches the new Proj4js projections given their srsCode', function() {
proj4.defs('EPSG:21781',
'+proj=somerc +lat_0=46.95240555555556 +lon_0=7.439583333333333 ' +
'+k_0=1 +x_0=600000 +y_0=200000 +ellps=bessel ' +
'+towgs84=674.374,15.056,405.346,0,0,0,0 +units=m +no_defs');
var code = 'urn:ogc:def:crs:EPSG:21781';
var srsCode = 'EPSG:21781';
proj4.defs(code, proj4.defs(srsCode));
var proj = ol.proj.get(code);
var proj2 = ol.proj.get(srsCode);
expect(ol.proj.equivalent(proj2, proj)).to.be(true);
delete proj4.defs[code];
});
it('numerically estimates point scale at the equator', function() {
var googleProjection = ol.proj.get('GOOGLE');
expect(ol.proj.getPointResolution(googleProjection, 1, [0, 0])).
to.roughlyEqual(1, 1e-1);
});
it('numerically estimates point scale at various latitudes', function() {
var epsg3857Projection = ol.proj.get('EPSG:3857');
var googleProjection = ol.proj.get('GOOGLE');
var point, y;
for (y = -20; y <= 20; ++y) {
point = [0, 1000000 * y];
expect(ol.proj.getPointResolution(googleProjection, 1, point)).to.roughlyEqual(
ol.proj.getPointResolution(epsg3857Projection, 1, point), 1e-1);
}
});
it('numerically estimates point scale at various points', function() {
var epsg3857Projection = ol.proj.get('EPSG:3857');
var googleProjection = ol.proj.get('GOOGLE');
var point, x, y;
for (x = -20; x <= 20; x += 2) {
for (y = -20; y <= 20; y += 2) {
point = [1000000 * x, 1000000 * y];
expect(ol.proj.getPointResolution(googleProjection, 1, point)).to.roughlyEqual(
ol.proj.getPointResolution(epsg3857Projection, 1, point), 1e-1);
}
}
});
it('does not overwrite existing projections in the registry', function() {
var epsg4326 = ol.proj.get('EPSG:4326');
new ol.proj.Projection({
code: 'EPSG:4326',
units: 'degrees',
extent: [-45, -45, 45, 45]
});
expect(ol.proj.get('EPSG:4326')).to.equal(epsg4326);
});
});
describe('ol.proj.getTransformFromProjections()', function() {
it('returns a transform function', function() {
var transform = ol.proj.getTransformFromProjections(ol.proj.get('GOOGLE'),
ol.proj.get('EPSG:4326'));
expect(typeof transform).to.be('function');
var output = transform([-12000000, 5000000]);
expect(output[0]).to.roughlyEqual(-107.79783409434258, 1e-9);
expect(output[1]).to.roughlyEqual(40.91627447067577, 1e-9);
});
it('works for longer arrays', function() {
var transform = ol.proj.getTransformFromProjections(ol.proj.get('GOOGLE'),
ol.proj.get('EPSG:4326'));
expect(typeof transform).to.be('function');
var output = transform([-12000000, 5000000, -12000000, 5000000]);
expect(output[0]).to.roughlyEqual(-107.79783409434258, 1e-9);
expect(output[1]).to.roughlyEqual(40.91627447067577, 1e-9);
expect(output[2]).to.roughlyEqual(-107.79783409434258, 1e-9);
expect(output[3]).to.roughlyEqual(40.91627447067577, 1e-9);
});
});
describe('ol.proj.getTransform()', function() {
it('returns a function', function() {
var transform = ol.proj.getTransform('GOOGLE', 'EPSG:4326');
expect(typeof transform).to.be('function');
});
it('returns a transform function', function() {
var transform = ol.proj.getTransform('GOOGLE', 'EPSG:4326');
expect(typeof transform).to.be('function');
var output = transform([-626172.13571216376, 6887893.4928337997]);
expect(output[0]).to.roughlyEqual(-5.625, 1e-9);
expect(output[1]).to.roughlyEqual(52.4827802220782, 1e-9);
});
it('works for longer arrays of coordinate values', function() {
var transform = ol.proj.getTransform('GOOGLE', 'EPSG:4326');
expect(typeof transform).to.be('function');
var output = transform([
-626172.13571216376, 6887893.4928337997,
-12000000, 5000000,
-626172.13571216376, 6887893.4928337997
]);
expect(output[0]).to.roughlyEqual(-5.625, 1e-9);
expect(output[1]).to.roughlyEqual(52.4827802220782, 1e-9);
expect(output[2]).to.roughlyEqual(-107.79783409434258, 1e-9);
expect(output[3]).to.roughlyEqual(40.91627447067577, 1e-9);
expect(output[4]).to.roughlyEqual(-5.625, 1e-9);
expect(output[5]).to.roughlyEqual(52.4827802220782, 1e-9);
});
it('accepts an optional destination array', function() {
var transform = ol.proj.getTransform('EPSG:3857', 'EPSG:4326');
var input = [-12000000, 5000000];
var output = [];
var got = transform(input, output);
expect(got).to.be(output);
expect(output[0]).to.roughlyEqual(-107.79783409434258, 1e-9);
expect(output[1]).to.roughlyEqual(40.91627447067577, 1e-9);
expect(input).to.eql([-12000000, 5000000]);
});
it('accepts a dimension', function() {
var transform = ol.proj.getTransform('GOOGLE', 'EPSG:4326');
expect(typeof transform).to.be('function');
var dimension = 3;
var output = transform([
-626172.13571216376, 6887893.4928337997, 100,
-12000000, 5000000, 200,
-626172.13571216376, 6887893.4928337997, 300
], undefined, dimension);
expect(output[0]).to.roughlyEqual(-5.625, 1e-9);
expect(output[1]).to.roughlyEqual(52.4827802220782, 1e-9);
expect(output[2]).to.be(100);
expect(output[3]).to.roughlyEqual(-107.79783409434258, 1e-9);
expect(output[4]).to.roughlyEqual(40.91627447067577, 1e-9);
expect(output[5]).to.be(200);
expect(output[6]).to.roughlyEqual(-5.625, 1e-9);
expect(output[7]).to.roughlyEqual(52.4827802220782, 1e-9);
expect(output[8]).to.be(300);
});
});
describe('ol.proj.transform()', function() {
it('transforms a 2d coordinate', function() {
var got = ol.proj.transform([-10, -20], 'EPSG:4326', 'EPSG:3857');
expect(got).to.have.length(2);
expect(got[0]).to.roughlyEqual(-1113194.9079327357, 1e-3);
expect(got[1]).to.roughlyEqual(-2273030.92698769, 1e-3);
});
it('transforms a 3d coordinate', function() {
var got = ol.proj.transform([-10, -20, 3], 'EPSG:4326', 'EPSG:3857');
expect(got).to.have.length(3);
expect(got[0]).to.roughlyEqual(-1113194.9079327357, 1e-3);
expect(got[1]).to.roughlyEqual(-2273030.92698769, 1e-3);
expect(got[2]).to.be(3);
});
it('transforms a 4d coordinate', function() {
var got = ol.proj.transform([-10, -20, 3, 4], 'EPSG:4326', 'EPSG:3857');
expect(got).to.have.length(4);
expect(got[0]).to.roughlyEqual(-1113194.9079327357, 1e-3);
expect(got[1]).to.roughlyEqual(-2273030.92698769, 1e-3);
expect(got[2]).to.be(3);
expect(got[3]).to.be(4);
});
it('works with 3d points and proj4 defs', function() {
proj4.defs('custom',
'+proj=somerc +lat_0=46.95240555555556 +lon_0=7.439583333333333 ' +
'+k_0=1 +x_0=600000 +y_0=200000 +ellps=bessel ' +
'+towgs84=674.374,15.056,405.346,0,0,0,0 +units=m +no_defs');
var got = ol.proj.transform([-111, 45.5, 123], 'EPSG:4326', 'custom');
expect(got).to.have.length(3);
expect(got[0]).to.roughlyEqual(-6601512.194209638, 1);
expect(got[1]).to.roughlyEqual(6145843.802742112, 1);
expect(got[2]).to.be(123);
delete proj4.defs.custom;
});
});
describe('ol.proj.Projection.prototype.getMetersPerUnit()', function() {
beforeEach(function() {
proj4.defs('EPSG:26782',
'+proj=lcc +lat_1=29.3 +lat_2=30.7 +lat_0=28.66666666666667 ' +
'+lon_0=-91.33333333333333 +x_0=609601.2192024384 +y_0=0 ' +
'+ellps=clrk66 +datum=NAD27 +to_meter=0.3048006096012192 +no_defs');
proj4.defs('EPSG:3739', '+proj=tmerc +lat_0=40.5 ' +
'+lon_0=-110.0833333333333 +k=0.9999375 +x_0=800000.0000101599 ' +
'+y_0=99999.99998983997 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 ' +
'+units=us-ft +no_defs');
proj4.defs('EPSG:4269', 'GEOGCS["NAD83",' +
'DATUM["North_American_Datum_1983",' +
'SPHEROID["GRS 1980",6378137,298.257222101,' +
'AUTHORITY["EPSG","7019"]],' +
'AUTHORITY["EPSG","6269"]],' +
'PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],' +
'UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],' +
'AUTHORITY["EPSG","4269"]]');
proj4.defs('EPSG:4279', 'GEOGCS["OS(SN)80",DATUM["OS_SN_1980",' +
'SPHEROID["Airy 1830",6377563.396,299.3249646,' +
'AUTHORITY["EPSG","7001"]],' +
'AUTHORITY["EPSG","6279"]],' +
'PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],' +
'UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],' +
'AUTHORITY["EPSG","4279"]]');
});
afterEach(function() {
delete proj4.defs['EPSG:26782'];
delete proj4.defs['EPSG:3739'];
delete proj4.defs['EPSG:4269'];
delete proj4.defs['EPSG:4279'];
});
it('returns value in meters', function() {
var epsg4326 = ol.proj.get('EPSG:4326');
expect(epsg4326.getMetersPerUnit()).to.eql(
ol.proj.EPSG4326.METERS_PER_UNIT);
});
it('works for proj4js projections without units', function() {
var epsg26782 = ol.proj.get('EPSG:26782');
expect(epsg26782.getMetersPerUnit()).to.eql(0.3048006096012192);
});
it('works for proj4js projections with units other than m', function() {
var epsg3739 = ol.proj.get('EPSG:3739');
expect(epsg3739.getMetersPerUnit()).to.eql(1200 / 3937);
});
it('works for proj4js OGC WKT GEOGCS projections', function() {
var epsg4269 = ol.proj.get('EPSG:4269');
expect(epsg4269.getMetersPerUnit()).to.eql(
6378137 * 0.01745329251994328);
var epsg4279 = ol.proj.get('EPSG:4279');
expect(epsg4279.getMetersPerUnit()).to.eql(
6377563.396 * 0.01745329251994328);
});
});
});