openlayers
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Build tools and sources for developing OpenLayers based mapping applications
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JavaScript
goog.provide('ol.test.geom.LineString');
goog.require('ol.extent');
goog.require('ol.geom.LineString');
describe('ol.geom.LineString', function() {
it('can be constructed with a null geometry', function() {
expect(function() {
return new ol.geom.LineString(null);
}).not.to.throwException();
});
describe('construct empty', function() {
var lineString;
beforeEach(function() {
lineString = new ol.geom.LineString([]);
});
it('defaults to layout XY', function() {
expect(lineString.getLayout()).to.be('XY');
});
it('has empty coordinates', function() {
expect(lineString.getCoordinates()).to.be.empty();
});
it('has an empty extent', function() {
expect(ol.extent.isEmpty(lineString.getExtent())).to.be(true);
});
it('has empty flat coordinates', function() {
expect(lineString.getFlatCoordinates()).to.be.empty();
});
it('has stride the expected stride', function() {
expect(lineString.getStride()).to.be(2);
});
it('can append coordinates', function() {
lineString.appendCoordinate([1, 2]);
expect(lineString.getCoordinates()).to.eql([[1, 2]]);
lineString.appendCoordinate([3, 4]);
expect(lineString.getCoordinates()).to.eql([[1, 2], [3, 4]]);
});
});
describe('construct with 2D coordinates', function() {
var lineString;
beforeEach(function() {
lineString = new ol.geom.LineString([[1, 2], [3, 4]]);
});
it('has the expected layout', function() {
expect(lineString.getLayout()).to.be('XY');
});
it('has the expected coordinates', function() {
expect(lineString.getCoordinates()).to.eql([[1, 2], [3, 4]]);
});
it('has the expected extent', function() {
expect(lineString.getExtent()).to.eql([1, 2, 3, 4]);
});
it('has the expected flat coordinates', function() {
expect(lineString.getFlatCoordinates()).to.eql([1, 2, 3, 4]);
});
it('has stride the expected stride', function() {
expect(lineString.getStride()).to.be(2);
});
describe('#intersectsExtent', function() {
it('return false for non matching extent', function() {
expect(lineString.intersectsExtent([1, 3, 1.9, 4])).to.be(false);
});
it('return true for extent on midpoint', function() {
expect(lineString.intersectsExtent([2, 3, 4, 3])).to.be(true);
});
it('returns true for the geom\'s own extent', function() {
expect(lineString.intersectsExtent(lineString.getExtent())).to.be(true);
});
});
describe('#getCoordinateAt', function() {
it('return the first point when fraction is 0', function() {
expect(lineString.getCoordinateAt(0)).to.eql([1, 2]);
});
it('return the last point when fraction is 1', function() {
expect(lineString.getCoordinateAt(1)).to.eql([3, 4]);
});
it('return the mid point when fraction is 0.5', function() {
expect(lineString.getCoordinateAt(0.5)).to.eql([2, 3]);
});
});
});
describe('construct with 3D coordinates', function() {
var lineString;
beforeEach(function() {
lineString = new ol.geom.LineString([[1, 2, 3], [4, 5, 6]]);
});
it('has the expected layout', function() {
expect(lineString.getLayout()).to.be('XYZ');
});
it('has the expected coordinates', function() {
expect(lineString.getCoordinates()).to.eql([[1, 2, 3], [4, 5, 6]]);
});
it('has the expected extent', function() {
expect(lineString.getExtent()).to.eql([1, 2, 4, 5]);
});
it('has the expected flat coordinates', function() {
expect(lineString.getFlatCoordinates()).to.eql([1, 2, 3, 4, 5, 6]);
});
it('has the expected stride', function() {
expect(lineString.getStride()).to.be(3);
});
describe('#intersectsExtent', function() {
it('return false for non matching extent', function() {
expect(lineString.intersectsExtent([1, 3, 1.9, 4])).to.be(false);
});
it('return true for extent on midpoint', function() {
expect(lineString.intersectsExtent([2, 3, 4, 3])).to.be(true);
});
it('returns true for the geom\'s own extent', function() {
expect(lineString.intersectsExtent(lineString.getExtent())).to.be(true);
});
});
});
describe('construct with 3D coordinates and layout XYM', function() {
var lineString;
beforeEach(function() {
lineString = new ol.geom.LineString(
[[1, 2, 3], [4, 5, 6]], 'XYM');
});
it('has the expected layout', function() {
expect(lineString.getLayout()).to.be('XYM');
});
it('has the expected coordinates', function() {
expect(lineString.getCoordinates()).to.eql([[1, 2, 3], [4, 5, 6]]);
});
it('has the expected extent', function() {
expect(lineString.getExtent()).to.eql([1, 2, 4, 5]);
});
it('has the expected flat coordinates', function() {
expect(lineString.getFlatCoordinates()).to.eql([1, 2, 3, 4, 5, 6]);
});
it('has the expected stride', function() {
expect(lineString.getStride()).to.be(3);
});
describe('#intersectsExtent', function() {
it('return false for non matching extent', function() {
expect(lineString.intersectsExtent([1, 3, 1.9, 4])).to.be(false);
});
it('return true for extent on midpoint', function() {
expect(lineString.intersectsExtent([2, 3, 4, 3])).to.be(true);
});
it('returns true for the geom\'s own extent', function() {
expect(lineString.intersectsExtent(lineString.getExtent())).to.be(true);
});
});
});
describe('construct with 4D coordinates', function() {
var lineString;
beforeEach(function() {
lineString = new ol.geom.LineString([[1, 2, 3, 4], [5, 6, 7, 8]]);
});
it('has the expected layout', function() {
expect(lineString.getLayout()).to.be('XYZM');
});
it('has the expected coordinates', function() {
expect(lineString.getCoordinates()).to.eql([[1, 2, 3, 4], [5, 6, 7, 8]]);
});
it('has the expected extent', function() {
expect(lineString.getExtent()).to.eql([1, 2, 5, 6]);
});
it('has the expected flat coordinates', function() {
expect(lineString.getFlatCoordinates()).to.eql([1, 2, 3, 4, 5, 6, 7, 8]);
});
it('has the expected stride', function() {
expect(lineString.getStride()).to.be(4);
});
describe('#intersectsExtent', function() {
it('return false for non matching extent', function() {
expect(lineString.intersectsExtent([1, 3, 1.9, 4])).to.be(false);
});
it('return true for extent on midpoint', function() {
expect(lineString.intersectsExtent([2, 3, 4, 3])).to.be(true);
});
it('returns true for the geom\'s own extent', function() {
expect(lineString.intersectsExtent(lineString.getExtent())).to.be(true);
});
});
});
describe('#scale()', function() {
it('scales a linestring', function() {
var geom = new ol.geom.LineString([[-10, -20], [10, 20]]);
geom.scale(10);
var coordinates = geom.getCoordinates();
expect(coordinates).to.eql([[-100, -200], [100, 200]]);
});
it('accepts sx and sy', function() {
var geom = new ol.geom.LineString([[-10, -20], [10, 20]]);
geom.scale(2, 3);
var coordinates = geom.getCoordinates();
expect(coordinates).to.eql([[-20, -60], [20, 60]]);
});
it('accepts an anchor', function() {
var geom = new ol.geom.LineString([[-10, -20], [10, 20]]);
geom.scale(3, 2, [10, 20]);
var coordinates = geom.getCoordinates();
expect(coordinates).to.eql([[-50, -60], [10, 20]]);
});
});
describe('with a simple line string', function() {
var lineString;
beforeEach(function() {
lineString = new ol.geom.LineString(
[[0, 0], [1.5, 1], [3, 3], [5, 1], [6, 3.5], [7, 5]]);
});
describe('#getFirstCoordinate', function() {
it('returns the expected result', function() {
expect(lineString.getFirstCoordinate()).to.eql([0, 0]);
});
});
describe('#getFlatMidpoint', function() {
it('returns the expected result', function() {
var midpoint = lineString.getFlatMidpoint();
expect(midpoint).to.be.an(Array);
expect(midpoint).to.have.length(2);
expect(midpoint[0]).to.roughlyEqual(4, 1e-1);
expect(midpoint[1]).to.roughlyEqual(2, 1e-1);
});
});
describe('#getLastCoordinate', function() {
it('returns the expected result', function() {
expect(lineString.getLastCoordinate()).to.eql([7, 5]);
});
});
describe('#simplify', function() {
it('returns a simplified geometry', function() {
var simplified = lineString.simplify(1);
expect(simplified).to.be.an(ol.geom.LineString);
expect(simplified.getCoordinates()).to.eql(
[[0, 0], [3, 3], [5, 1], [7, 5]]);
});
it('does not modify the original', function() {
lineString.simplify(1);
expect(lineString.getCoordinates()).to.eql(
[[0, 0], [1.5, 1], [3, 3], [5, 1], [6, 3.5], [7, 5]]);
});
it('delegates to the internal method', function() {
var simplified = lineString.simplify(2);
var internal = lineString.getSimplifiedGeometry(4);
expect(simplified.getCoordinates()).to.eql(internal.getCoordinates());
});
});
describe('#getSimplifiedGeometry', function() {
it('returns the expectedResult', function() {
var simplifiedGeometry = lineString.getSimplifiedGeometry(1);
expect(simplifiedGeometry).to.be.an(ol.geom.LineString);
expect(simplifiedGeometry.getCoordinates()).to.eql(
[[0, 0], [3, 3], [5, 1], [7, 5]]);
});
it('caches by resolution', function() {
var simplifiedGeometry1 = lineString.getSimplifiedGeometry(1);
var simplifiedGeometry2 = lineString.getSimplifiedGeometry(1);
expect(simplifiedGeometry1).to.be(simplifiedGeometry2);
});
it('invalidates the cache when the geometry changes', function() {
var simplifiedGeometry1 = lineString.getSimplifiedGeometry(1);
lineString.setCoordinates(lineString.getCoordinates());
var simplifiedGeometry2 = lineString.getSimplifiedGeometry(1);
expect(simplifiedGeometry1).not.to.be(simplifiedGeometry2);
});
it('remembers the minimum squared tolerance', function() {
sinon.spy(lineString, 'getSimplifiedGeometryInternal');
var simplifiedGeometry1 = lineString.getSimplifiedGeometry(0.05);
expect(lineString.getSimplifiedGeometryInternal.callCount).to.be(1);
expect(simplifiedGeometry1).to.be(lineString);
var simplifiedGeometry2 = lineString.getSimplifiedGeometry(0.01);
expect(lineString.getSimplifiedGeometryInternal.callCount).to.be(1);
expect(simplifiedGeometry2).to.be(lineString);
});
});
describe('#getCoordinateAt', function() {
it('return the first point when fraction is 0', function() {
expect(lineString.getCoordinateAt(0)).to.eql([0, 0]);
});
it('return the last point when fraction is 1', function() {
expect(lineString.getCoordinateAt(1)).to.eql([7, 5]);
});
it('return the mid point when fraction is 0.5', function() {
var midpoint = lineString.getFlatMidpoint();
expect(lineString.getCoordinateAt(0.5)).to.eql(midpoint);
});
});
});
describe('with a simple XYM coordinates', function() {
var lineString;
beforeEach(function() {
lineString = new ol.geom.LineString(
[[1, 2, 3], [4, 5, 6]], 'XYM');
});
describe('#getCoordinateAtM', function() {
it('returns the expected value', function() {
expect(lineString.getCoordinateAtM(2, false)).to.be(null);
expect(lineString.getCoordinateAtM(2, true)).to.eql([1, 2, 2]);
expect(lineString.getCoordinateAtM(3, false)).to.eql([1, 2, 3]);
expect(lineString.getCoordinateAtM(3, true)).to.eql([1, 2, 3]);
expect(lineString.getCoordinateAtM(4, false)).to.eql([2, 3, 4]);
expect(lineString.getCoordinateAtM(4, true)).to.eql([2, 3, 4]);
expect(lineString.getCoordinateAtM(5, false)).to.eql([3, 4, 5]);
expect(lineString.getCoordinateAtM(5, true)).to.eql([3, 4, 5]);
expect(lineString.getCoordinateAtM(6, false)).to.eql([4, 5, 6]);
expect(lineString.getCoordinateAtM(6, true)).to.eql([4, 5, 6]);
expect(lineString.getCoordinateAtM(7, false)).to.eql(null);
expect(lineString.getCoordinateAtM(7, true)).to.eql([4, 5, 7]);
});
});
});
describe('with several XYZM coordinates', function() {
var lineString;
beforeEach(function() {
lineString = new ol.geom.LineString([
[0, 0, 0, 0],
[1, -1, 2, 1],
[2, -2, 4, 2],
[4, -4, 8, 4],
[8, -8, 16, 8],
[12, -12, 24, 12],
[14, -14, 28, 14],
[15, -15, 30, 15],
[16, -16, 32, 16],
[18, -18, 36, 18],
[22, -22, 44, 22]
]);
});
describe('#getCoordinateAtM', function() {
it('returns the expected value', function() {
expect(lineString.getLayout()).to.be('XYZM');
var m;
for (m = 0; m <= 22; m += 0.5) {
expect(lineString.getCoordinateAtM(m, true)).to.eql(
[m, -m, 2 * m, m]);
}
});
});
});
});