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Merge pull request #6966 from ahocevar/resolution-for-zoom

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Add getResolutionForZoom method for ol.View
This commit is contained in:
Andreas Hocevar
2017-06-28 13:01:54 +02:00
committed by GitHub
parent 72f5ff917f aa8d7b0b36
commit c0e4da6d8c
2 changed files with 38 additions and 3 deletions
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16
src/ol/view.js
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@@ -809,6 +809,18 @@ ol.View.prototype.getZoomForResolution = function(resolution) {
};
/**
* Get the resolution for a zoom level.
* @param {number} zoom Zoom level.
* @return {number} The view resolution for the provided zoom level.
* @api
*/
ol.View.prototype.getResolutionForZoom = function(zoom) {
return /** @type {number} */ (this.constrainResolution(
this.maxResolution_, zoom - this.minZoom_, 0));
};
/**
* Fit the given geometry or extent based on the given map size and border.
* The size is pixel dimensions of the box to fit the extent into.
@@ -1025,9 +1037,7 @@ ol.View.prototype.setRotation = function(rotation) {
* @api
*/
ol.View.prototype.setZoom = function(zoom) {
var resolution = this.constrainResolution(
this.maxResolution_, zoom - this.minZoom_, 0);
this.setResolution(resolution);
this.setResolution(this.getResolutionForZoom(zoom));
};

25
test/spec/ol/view.test.js
View File

@@ -988,6 +988,31 @@ describe('ol.View', function() {
});
describe('#getResolutionForZoom', function() {
it('returns correct zoom resolution', function() {
var view = new ol.View();
var max = view.getMaxZoom();
var min = view.getMinZoom();
expect(view.getResolutionForZoom(max)).to.be(view.getMinResolution());
expect(view.getResolutionForZoom(min)).to.be(view.getMaxResolution());
});
it('returns correct zoom levels for specifically configured resolutions', function() {
var view = new ol.View({
resolutions: [10, 8, 6, 4, 2]
});
expect(view.getResolutionForZoom(0)).to.be(10);
expect(view.getResolutionForZoom(1)).to.be(8);
expect(view.getResolutionForZoom(2)).to.be(6);
expect(view.getResolutionForZoom(3)).to.be(4);
expect(view.getResolutionForZoom(4)).to.be(2);
});
});
describe('#getMaxZoom', function() {
it('returns the zoom level for the min resolution', function() {