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Avoid panning off the edge of the world

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This commit is contained in:
Tim Schaub
2019-05-14 19:34:03 -06:00
parent 72551ab506
commit 217c6ba764
4 changed files with 59 additions and 10 deletions
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46
test/spec/ol/view.test.js
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@@ -100,10 +100,50 @@ describe('ol.View', function() {
describe('with no options', function() {
it('gives a correct center constraint function', function() {
const options = {};
const size = [512, 256];
const resolution = 1e5;
const fn = createCenterConstraint(options);
expect(fn([0, 0])).to.eql([0, 0]);
expect(fn(undefined)).to.eql(undefined);
expect(fn([42, -100])).to.eql([42, -100]);
expect(fn([0, 0], resolution, size)).to.eql([0, 0]);
expect(fn([42, -100], resolution, size)).to.eql([42, -100]);
});
});
describe('panning off the edge of the world', function() {
it('disallows going north off the world', function() {
const options = {
projection: 'EPSG:4326'
};
const size = [360, 180];
const resolution = 0.5;
const fn = createCenterConstraint(options);
expect(fn([0, 0], resolution, size)).to.eql([0, 0]);
expect(fn([0, 60], resolution, size)).to.eql([0, 45]);
expect(fn([180, 60], resolution, size)).to.eql([180, 45]);
expect(fn([-180, 60], resolution, size)).to.eql([-180, 45]);
});
it('disallows going south off the world', function() {
const options = {
projection: 'EPSG:4326'
};
const size = [360, 180];
const resolution = 0.5;
const fn = createCenterConstraint(options);
expect(fn([0, 0], resolution, size)).to.eql([0, 0]);
expect(fn([0, -60], resolution, size)).to.eql([0, -45]);
expect(fn([180, -60], resolution, size)).to.eql([180, -45]);
expect(fn([-180, -60], resolution, size)).to.eql([-180, -45]);
});
});
describe('with multiWorld: true', function() {
it('gives a correct center constraint function', function() {
const options = {multiWorld: true};
const size = [512, 256];
const resolution = 1e5;
const fn = createCenterConstraint(options);
expect(fn([0, 0], resolution, size)).to.eql([0, 0]);
expect(fn([42, -100], resolution, size)).to.eql([42, -100]);
});
});