ashatora/openlayers
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Keep transformed coordinates within valid y range

Browse Source
This commit is contained in:
Tim Schaub
2016-10-05 07:26:41 -06:00
parent 5cdbd76b1e
commit 321c65b023
2 changed files with 41 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
test/spec/ol/proj/epsg3857.test.js
View File

@@ -2,6 +2,7 @@ goog.provide('ol.test.proj.EPSG3857');
goog.require('ol.proj');
goog.require('ol.proj.common');
describe('ol.proj.EPSG3857', function() {
afterEach(function() {
@@ -9,6 +10,38 @@ describe('ol.proj.EPSG3857', function() {
ol.proj.common.add();
});
describe('fromEPSG4326()', function() {
it('transforms from geographic to Web Mercator', function() {
var forward = ol.proj.EPSG3857.fromEPSG4326;
var edge = ol.proj.EPSG3857.HALF_SIZE;
var tolerance = 1e-5;
var cases = [{
g: [0, 0],
m: [0, 0]
}, {
g: [-180, -90],
m: [-edge, -edge]
}, {
g: [180, 90],
m: [edge, edge]
}, {
g: [-111.0429, 45.6770],
m: [-12361239.084208, 5728738.469095]
}];
for (var i = 0, ii = cases.length; i < ii; ++i) {
var point = cases[i].g;
var transformed = forward(point);
expect(transformed[0]).to.roughlyEqual(cases[i].m[0], tolerance);
expect(transformed[1]).to.roughlyEqual(cases[i].m[1], tolerance);
}
});
});
describe('getPointResolution', function() {
it('returns the correct point scale at the equator', function() {
@@ -37,7 +70,7 @@ describe('ol.proj.EPSG3857', function() {
var epsg4326 = ol.proj.get('EPSG:4326');
var resolution = 19.11;
var latitude;
for (latitude = 0; latitude < 90; ++latitude) {
for (latitude = 0; latitude <= 85; ++latitude) {
var point = ol.proj.transform([0, latitude], epsg4326, epsg3857);
expect(epsg3857.getPointResolution(resolution, point)).
to.roughlyEqual(19.11 * Math.cos(Math.PI * latitude / 180), 1e-9);