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api_linestring.test.js
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api_linestring.test.js
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const gdal = require('../lib/gdal.js')
const assert = require('chai').assert
describe('gdal.LineString', () => {
afterEach(gc)
it('should be instantiable', () => {
new gdal.LineString()
})
it('should inherit from Geometry', () => {
assert.instanceOf(new gdal.LineString(), gdal.LineString)
assert.instanceOf(new gdal.LineString(), gdal.Geometry)
})
describe('instance', () => {
describe('getLength()', () => {
it('should return length', () => {
const line = new gdal.LineString()
line.points.add(0, 0, 0)
line.points.add(10, 10, 0)
line.points.add(10, 20, 0)
assert.closeTo(
line.getLength(),
Math.sqrt(10 * 10 + 10 * 10) + 10,
0.001
)
})
})
describe('addSubLineString()', () => {
it('should append to current linestring', () => {
const a = gdal.Geometry.fromWKT('LINESTRING(0 0, 0 1, 0 2)')
const b = gdal.Geometry.fromWKT('LINESTRING(0 2, 1 2, 2 2)')
const c = gdal.Geometry.fromWKT(
'LINESTRING(0 0, 0 1, 0 2, 0 2, 1 2, 2 2)'
)
a.addSubLineString(b)
assert.isTrue(a.equals(c))
})
it('should use start option', () => {
const a = gdal.Geometry.fromWKT('LINESTRING(0 0, 0 1, 0 2)')
const b = gdal.Geometry.fromWKT('LINESTRING(0 2, 1 2, 2 2)')
const c = gdal.Geometry.fromWKT('LINESTRING(0 0, 0 1, 0 2, 1 2, 2 2)')
a.addSubLineString(b, 1)
assert.isTrue(a.equals(c))
})
it('should use end option', () => {
const a = gdal.Geometry.fromWKT('LINESTRING(0 0, 0 1, 0 2)')
const b = gdal.Geometry.fromWKT('LINESTRING(0 2, 1 2, 2 2)')
const c = gdal.Geometry.fromWKT('LINESTRING(0 0, 0 1, 0 2, 1 2)')
a.addSubLineString(b, 1, 1)
assert.isTrue(a.equals(c))
})
it('should throw if given a non-linestring', () => {
const a = gdal.Geometry.fromWKT('LINESTRING(0 0, 0 1, 0 2)')
const b = gdal.Geometry.fromWKT('POINT(0 2)')
assert.throws(() => {
a.addSubLineString(b)
})
})
it('should throw if given invalid indexes', () => {
const a = gdal.Geometry.fromWKT('LINESTRING(0 0, 0 1, 0 2)')
const b = gdal.Geometry.fromWKT('LINESTRING(1 2)')
assert.throws(() => {
a.addSubLineString(b, -1)
})
assert.throws(() => {
a.addSubLineString(b, 1)
})
assert.throws(() => {
a.addSubLineString(b, 0, 1)
})
assert.throws(() => {
a.addSubLineString(b, 0, -2)
})
})
})
describe('"points" property', () => {
describe('count()', () => {
it('should return number of points', () => {
const line = new gdal.LineString()
line.points.add(0, 0, 0)
line.points.add(10, 10, 0)
line.points.add(10, 10, 2)
assert.equal(line.points.count(), 3)
})
})
describe('add()', () => {
it('should accept gdal.Point instance', () => {
const line = new gdal.LineString()
const pt = new gdal.Point(2, 3)
line.points.add(pt)
const pt_result = line.points.get(0)
assert.equal(pt_result.x, 2)
assert.equal(pt_result.y, 3)
})
it('should accept gdal.Point array', () => {
const line = new gdal.LineString()
line.points.add([ new gdal.Point(2, 3), new gdal.Point(4, 5) ])
const pt_result1 = line.points.get(0)
assert.equal(pt_result1.x, 2)
assert.equal(pt_result1.y, 3)
const pt_result2 = line.points.get(1)
assert.equal(pt_result2.x, 4)
assert.equal(pt_result2.y, 5)
})
it('should accept object', () => {
const line = new gdal.LineString()
line.points.add({ x: 2, y: 3 })
const pt_result = line.points.get(0)
assert.equal(pt_result.x, 2)
assert.equal(pt_result.y, 3)
})
it('should accept object array', () => {
const line = new gdal.LineString()
line.points.add([
{ x: 2, y: 3 },
{ x: 4, y: 5 }
])
const pt_result1 = line.points.get(0)
assert.equal(pt_result1.x, 2)
assert.equal(pt_result1.y, 3)
const pt_result2 = line.points.get(1)
assert.equal(pt_result2.x, 4)
assert.equal(pt_result2.y, 5)
})
it('should accept x,y,z arguments', () => {
const line = new gdal.LineString()
line.points.add(1, 2, 3)
const pt_result = line.points.get(0)
assert.equal(pt_result.x, 1)
assert.equal(pt_result.y, 2)
assert.equal(pt_result.z, 3)
})
})
describe('set()', () => {
it("should throw if point doesn't exist", () => {
assert.throws(() => {
const line = new gdal.LineString()
line.points.set(1, new gdal.Point(1, 1))
line.points.set(1, { x: 1, y: 1 })
line.points.set(1, 1, 1, 1)
})
})
it('should accept object', () => {
const line = new gdal.LineString()
line.points.add(0, 0)
line.points.set(0, { x: 1, y: 2 })
const pt = line.points.get(0)
assert.equal(pt.x, 1)
assert.equal(pt.y, 2)
})
it('should accept Point instance', () => {
const line = new gdal.LineString()
line.points.add(0, 0)
line.points.set(0, new gdal.Point(1, 2))
const pt = line.points.get(0)
assert.equal(pt.x, 1)
assert.equal(pt.y, 2)
})
it('should accept x,y,z arguments', () => {
const line = new gdal.LineString()
line.points.add(0, 0)
line.points.set(0, 1, 2, 3)
const pt = line.points.get(0)
assert.equal(pt.x, 1)
assert.equal(pt.y, 2)
assert.equal(pt.z, 3)
})
})
describe('get()', () => {
it("should return null if point doesn't exist", () => {
const line = new gdal.LineString()
assert.isNull(line.points.get(2))
})
it('should Point instance', () => {
const line = new gdal.LineString()
line.points.add(1, 2, 3)
const pt = line.points.get(0)
assert.instanceOf(pt, gdal.Point)
assert.equal(pt.x, 1)
assert.equal(pt.y, 2)
assert.equal(pt.z, 3)
})
})
describe('resize()', () => {
it('should adjust the number of points', () => {
const line = new gdal.LineString()
line.points.add(1, 2, 3)
line.points.add(2, 3, 4)
line.points.add(3, 4, 5)
line.points.resize(2)
assert.equal(line.points.count(), 2)
})
})
describe('reverse()', () => {
it('should flip order of points', () => {
const line = new gdal.LineString()
line.points.add(1, 2, 3)
line.points.add(2, 3, 4)
line.points.add(3, 4, 5)
line.points.reverse()
const p1 = line.points.get(0)
const p2 = line.points.get(1)
const p3 = line.points.get(2)
assert.equal(p1.x, 3)
assert.equal(p2.x, 2)
assert.equal(p3.x, 1)
})
})
describe('forEach()', () => {
it('should stop if callback returns false', () => {
const line = new gdal.LineString()
line.points.add(1, 2, 3)
line.points.add(2, 3, 4)
line.points.add(3, 4, 5)
let count = 0
line.points.forEach((pt, i) => {
count++
assert.isNumber(i)
if (i === 1) return false
})
assert.equal(count, 2)
})
it('should iterate through all points', () => {
const x_expected = [ 1, 2, 3 ]
const x_actual = []
const line = new gdal.LineString()
line.points.add(1, 2, 3)
line.points.add(2, 3, 4)
line.points.add(3, 4, 5)
line.points.forEach((pt, i) => {
assert.isNumber(i)
x_actual.push(pt.x)
})
assert.deepEqual(x_actual, x_expected)
})
})
describe('map()', () => {
it('should operate normally', () => {
const line = new gdal.LineString()
line.points.add(1, 2, 3)
line.points.add(2, 3, 4)
line.points.add(3, 4, 5)
const result = line.points.map((pt, i) =>
[ pt.x, pt.y, pt.z, i ].join('/')
)
assert.deepEqual(result, [ '1/2/3/0', '2/3/4/1', '3/4/5/2' ])
})
})
describe('toArray()', () => {
it('should return array of Point instances', () => {
const line = new gdal.LineString()
line.points.add(1, 2, 3)
line.points.add(2, 3, 4)
line.points.add(3, 4, 5)
const points = line.points.toArray()
assert.lengthOf(points, 3)
assert.instanceOf(points[0], gdal.Point)
assert.instanceOf(points[1], gdal.Point)
assert.instanceOf(points[2], gdal.Point)
assert.equal(points[0].x, 1)
assert.equal(points[1].x, 2)
assert.equal(points[2].x, 3)
})
})
})
})
})