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Calculate tile grid extent from extent of bottom-level tile matrix

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Prefers extent derived from the tile matrix set in the capabilities
over default projection extent.
This commit is contained in:
Mateusz Łoskot
2019-01-21 15:21:39 +01:00
parent 8f46bb563b
commit 98e8bec370
4 changed files with 77 additions and 20 deletions
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27
test/spec/ol/source/wmts.test.js
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@@ -1,4 +1,5 @@
import WMTSCapabilities from '../../../../src/ol/format/WMTSCapabilities.js';
import {getBottomLeft, getTopRight} from '../../../../src/ol/extent.js';
import {get as getProjection} from '../../../../src/ol/proj.js';
import Projection from '../../../../src/ol/proj/Projection.js';
import WMTSTileGrid from '../../../../src/ol/tilegrid/WMTS.js';
@@ -149,6 +150,32 @@ describe('ol.source.WMTS', function() {
expect(options.projection.getCode()).to.be.eql('urn:ogc:def:crs:OGC:1.3:CRS84');
});
it('uses extent of tile matrix instead of projection extent', function() {
const options = optionsFromCapabilities(capabilities,
{layer: 'BlueMarbleNextGeneration', matrixSet: 'google3857subset'});
// Since google3857subset defines subset of space defined by the google3857 matrix set:
// - top left corner: -10000000, 10000000
// - calculated grid extent: [-10000000, 9999694.25188686, -9999694.25188686, 10000000]
// then the tile grid extent is only a part of the full projection extent.
const gridExtent = options.tileGrid.getExtent();
const gridBottomLeft = getBottomLeft(gridExtent);
const gridTopRight = getTopRight(gridExtent);
expect(Math.round(gridBottomLeft[0])).to.be.eql(-10000000);
expect(Math.round(gridBottomLeft[1])).to.be.eql(9999847);
expect(Math.round(gridTopRight[0])).to.be.eql(-9999847);
expect(Math.round(gridTopRight[1])).to.be.eql(10000000);
const projExtent = options.projection.getExtent();
const projBottomLeft = getBottomLeft(projExtent);
const projTopRight = getTopRight(projExtent);
expect(Math.round(projBottomLeft[0])).to.be.eql(-20037508);
expect(Math.round(projBottomLeft[1])).to.be.eql(-20037508);
expect(Math.round(projTopRight[0])).to.be.eql(20037508);
expect(Math.round(projTopRight[1])).to.be.eql(20037508);
});
it('doesn\'t fail if the GetCap doesn\'t contains Constraint tags', function() {
const tmpXml = content.replace(/<ows:Constraint[\s\S]*?<\/ows:Constraint>/g, '');
const tmpCapabilities = parser.read(tmpXml);