45 lines
1.5 KiB
JavaScript
45 lines
1.5 KiB
JavaScript
import {calculateSourceResolution} from '../../../../src/ol/reproj.js';
|
|
import {get as getProjection, transform} from '../../../../src/ol/proj.js';
|
|
|
|
|
|
describe('ol.reproj', function() {
|
|
|
|
describe('#calculateSourceResolution', function() {
|
|
const proj3857 = getProjection('EPSG:3857');
|
|
const proj4326 = getProjection('EPSG:4326');
|
|
const origin = [0, 0];
|
|
const point3857 = [50, 40];
|
|
const point4326 = transform(point3857, proj3857, proj4326);
|
|
|
|
it('is identity for identical projection', function() {
|
|
let result;
|
|
const resolution = 500;
|
|
result = calculateSourceResolution(
|
|
proj3857, proj3857, origin, resolution);
|
|
expect(result).to.be(resolution);
|
|
|
|
result = calculateSourceResolution(
|
|
proj3857, proj3857, point3857, resolution);
|
|
expect(result).to.be(resolution);
|
|
|
|
result = calculateSourceResolution(
|
|
proj4326, proj4326, point4326, resolution);
|
|
expect(result).to.be(resolution);
|
|
});
|
|
|
|
it('calculates correctly', function() {
|
|
const resolution4326 = 5;
|
|
|
|
const resolution3857 = calculateSourceResolution(
|
|
proj3857, proj4326, point4326, resolution4326);
|
|
expect(resolution3857).not.to.be(resolution4326);
|
|
expect(resolution3857).to.roughlyEqual(
|
|
5 * proj4326.getMetersPerUnit(), 1e-4);
|
|
|
|
const result = calculateSourceResolution(
|
|
proj4326, proj3857, point3857, resolution3857);
|
|
expect(result).to.be(resolution4326);
|
|
});
|
|
});
|
|
});
|