import expect from 'expect'

import createArcForLWPolyine from '../../src/util/createArcForLWPolyline'

describe('Arc for LWPOLYLINE', () => {
  it('can be created for an angle < 180 degrees', () => {
    const from = [10, 0]
    const to = [0, 0]
    const bulge = Math.tan(Math.PI / 2 / 4)

    expect(createArcForLWPolyine(from, to, bulge, 15)).toEqual([
      [8.53553390593274, 1.1237243569579451],
      [6.830127018922194, 1.8301270189221936],
      [5, 2.0710678118654755],
      [3.169872981077806, 1.8301270189221936],
      [1.4644660940672636, 1.123724356957946],
    ])
  })

  it('can be created for an angle > 180 degrees', () => {
    const from = [10, 0]
    const to = [0, 0]
    const bulge = Math.tan((Math.PI * 3) / 2 / 4)

    expect(createArcForLWPolyine(from, to, bulge, 45)).toEqual([
      [12.071067811865476, 4.999999999999999],
      [10, 9.999999999999998],
      [5, 12.071067811865474],
      [8.881784197001252e-16, 10],
      [-2.0710678118654746, 5],
    ])
  })

  it('can be created for negative bulge', () => {
    const from = [10, 0]
    const to = [0, 0]
    const bulge = -Math.tan((Math.PI * 3) / 2 / 4)

    expect(createArcForLWPolyine(from, to, bulge, 45)).toEqual([
      [12.071067811865476, -5.000000000000001],
      [9.999999999999998, -10],
      [4.999999999999999, -12.071067811865474],
      [-8.881784197001252e-16, -9.999999999999998],
      [-2.0710678118654746, -4.999999999999998],
    ])
  })
})