openlayers
Version:
Build tools and sources for developing OpenLayers based mapping applications
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JavaScript
goog.provide('ol.test.RotationConstraint');
goog.require('ol.RotationConstraint');
describe('ol.RotationConstraint', function() {
describe('SnapToZero', function() {
it('returns expected rotation value', function() {
var rotationConstraint = ol.RotationConstraint.createSnapToZero(0.3);
expect(rotationConstraint(0.1, 0)).to.eql(0);
expect(rotationConstraint(0.2, 0)).to.eql(0);
expect(rotationConstraint(0.3, 0)).to.eql(0);
expect(rotationConstraint(0.4, 0)).to.eql(0.4);
expect(rotationConstraint(-0.1, 0)).to.eql(0);
expect(rotationConstraint(-0.2, 0)).to.eql(0);
expect(rotationConstraint(-0.3, 0)).to.eql(0);
expect(rotationConstraint(-0.4, 0)).to.eql(-0.4);
expect(rotationConstraint(1, -0.9)).to.eql(0);
expect(rotationConstraint(1, -0.8)).to.eql(0);
// floating-point arithmetic
expect(rotationConstraint(1, -0.7)).not.to.eql(0);
expect(rotationConstraint(1, -0.6)).to.eql(0.4);
expect(rotationConstraint(-1, 0.9)).to.eql(0);
expect(rotationConstraint(-1, 0.8)).to.eql(0);
// floating-point arithmetic
expect(rotationConstraint(-1, 0.7)).not.to.eql(0);
expect(rotationConstraint(-1, 0.6)).to.eql(-0.4);
});
});
});