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api_polygon.test.js
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api_polygon.test.js
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var assert = require('chai').assert;
var gdal = require('../lib/gdal.js');
describe('gdal.Polygon', function() {
afterEach(gc);
it('should be instantiable', function() {
new gdal.Polygon();
});
it('should inherit from Geometry', function() {
assert.instanceOf(new gdal.Polygon(), gdal.Polygon);
assert.instanceOf(new gdal.Polygon(), gdal.Geometry);
});
describe('instance', function() {
describe('"rings" property', function() {
describe('get()', function() {
it('should return null if ring doesn\'t exist', function() {
var polygon = new gdal.Polygon();
assert.isNull(polygon.rings.get(2));
});
it('should return LinearRing instance', function() {
var polygon = new gdal.Polygon();
var ring = new gdal.LinearRing();
ring.points.add(0, 0, 0);
ring.points.add(10, 0, 0);
ring.points.add(10, 10, 0);
ring.points.add(0, 10, 0);
ring.points.add(0, 0, 0);
polygon.rings.add(ring);
assert.instanceOf(polygon.rings.get(0), gdal.LinearRing);
});
});
describe('count()', function() {
it('should return ring count', function() {
var polygon = new gdal.Polygon();
assert.equal(polygon.rings.count(), 0);
var ring = new gdal.LinearRing();
ring.points.add(0, 0, 0);
ring.points.add(10, 0, 0);
ring.points.add(10, 10, 0);
ring.points.add(0, 10, 0);
ring.points.add(0, 0, 0);
polygon.rings.add(ring);
assert.equal(polygon.rings.count(), 1);
});
});
describe('add()', function() {
it('should add a ring', function() {
var polygon = new gdal.Polygon();
var ring = new gdal.LinearRing();
ring.points.add(0, 0, 0);
ring.points.add(10, 0, 0);
ring.points.add(10, 11, 0);
ring.points.add(0, 10, 0);
ring.points.add(0, 0, 0);
polygon.rings.add(ring);
var ring_result = polygon.rings.get(0);
assert.instanceOf(ring_result, gdal.LinearRing);
assert.equal(ring_result.points.get(2).y, 11);
});
it('should accept multiple LinearRing instances', function() {
var ring1 = new gdal.LinearRing();
ring1.points.add(0, 0, 0);
ring1.points.add(10, 0, 0);
ring1.points.add(10, 11, 0);
ring1.points.add(0, 10, 0);
ring1.points.add(0, 0, 0);
var ring2 = new gdal.LinearRing();
ring2.points.add(1, 0, 0);
ring2.points.add(11, 0, 0);
ring2.points.add(11, 11, 0);
ring2.points.add(1, 10, 0);
ring2.points.add(1, 0, 0);
var polygon = new gdal.Polygon();
polygon.rings.add([ring1, ring2]);
assert.equal(polygon.rings.count(), 2);
});
});
describe('forEach()', function() {
var polygon;
before(function() {
var ring1 = new gdal.LinearRing();
ring1.points.add(0, 0, 0);
ring1.points.add(10, 0, 0);
ring1.points.add(10, 11, 0);
ring1.points.add(0, 10, 0);
ring1.points.add(0, 0, 0);
var ring2 = new gdal.LinearRing();
ring2.points.add(1, 0, 0);
ring2.points.add(11, 0, 0);
ring2.points.add(11, 11, 0);
ring2.points.add(1, 10, 0);
ring2.points.add(1, 0, 0);
var ring3 = new gdal.LinearRing();
ring3.points.add(2, 0, 0);
ring3.points.add(20, 0, 0);
ring3.points.add(20, 11, 0);
ring3.points.add(3, 10, 0);
ring3.points.add(3, 0, 0);
polygon = new gdal.Polygon();
polygon.rings.add([ring1, ring2, ring3]);
});
it('should stop if callback returns false', function() {
var count = 0;
polygon.rings.forEach(function(pt, i) {
count++;
assert.isNumber(i);
if (i === 1) return false;
});
assert.equal(count, 2);
});
it('should iterate through all points', function() {
var result = [];
polygon.rings.forEach(function(ring) {
result.push(ring.points.toArray().map(function(pt) {
return pt.toJSON();
}));
});
assert.deepEqual(result, [
['{ "type": "Point", "coordinates": [ 0.0, 0.0, 0.0 ] }',
'{ "type": "Point", "coordinates": [ 10.0, 0.0, 0.0 ] }',
'{ "type": "Point", "coordinates": [ 10.0, 11.0, 0.0 ] }',
'{ "type": "Point", "coordinates": [ 0.0, 10.0, 0.0 ] }',
'{ "type": "Point", "coordinates": [ 0.0, 0.0, 0.0 ] }' ],
[ '{ "type": "Point", "coordinates": [ 1.0, 0.0, 0.0 ] }',
'{ "type": "Point", "coordinates": [ 11.0, 0.0, 0.0 ] }',
'{ "type": "Point", "coordinates": [ 11.0, 11.0, 0.0 ] }',
'{ "type": "Point", "coordinates": [ 1.0, 10.0, 0.0 ] }',
'{ "type": "Point", "coordinates": [ 1.0, 0.0, 0.0 ] }' ],
[ '{ "type": "Point", "coordinates": [ 2.0, 0.0, 0.0 ] }',
'{ "type": "Point", "coordinates": [ 20.0, 0.0, 0.0 ] }',
'{ "type": "Point", "coordinates": [ 20.0, 11.0, 0.0 ] }',
'{ "type": "Point", "coordinates": [ 3.0, 10.0, 0.0 ] }',
'{ "type": "Point", "coordinates": [ 3.0, 0.0, 0.0 ] }' ]
]);
});
});
describe('map()', function() {
it('should operate normally', function() {
var polygon = new gdal.Polygon();
var ring = new gdal.LinearRing();
ring.points.add(0, 0, 0);
ring.points.add(10, 0, 0);
ring.points.add(10, 10, 0);
ring.points.add(0, 11, 0);
ring.points.add(0, 0, 0);
polygon.rings.add(ring);
var result = polygon.rings.map(function(ring, i) {
assert.isNumber(i);
assert.instanceOf(ring, gdal.LinearRing);
return 'a';
});
assert.isArray(result);
assert.lengthOf(result, 1);
assert.equal(result[0], 'a');
});
});
describe('toArray()', function() {
it('should return array of LinearRing instances', function() {
var polygon = new gdal.Polygon();
var ring = new gdal.LinearRing();
ring.points.add(0, 0, 0);
ring.points.add(10, 0, 0);
ring.points.add(10, 10, 0);
ring.points.add(0, 11, 0);
ring.points.add(0, 0, 0);
polygon.rings.add(ring);
var array = polygon.rings.toArray();
assert.isArray(array);
assert.lengthOf(array, 1);
assert.instanceOf(array[0], gdal.LinearRing);
assert.equal(array[0].points.get(3).y, 11);
});
});
});
describe('getArea()', function() {
it('should return area', function() {
var polygon = new gdal.Polygon();
var ring = new gdal.LinearRing();
ring.points.add(0, 0, 0);
ring.points.add(10, 0, 0);
ring.points.add(10, 10, 0);
ring.points.add(0, 10, 0);
ring.points.add(0, 0, 0);
polygon.rings.add(ring);
assert.closeTo(ring.getArea(), 100, 0.001);
});
});
});
});