avocado-old/packages/math/vector/index.spec.coffee

import {Vector} from '@avocado/math'

describe 'Vector', ->

  it 'can do mathematical operations', ->

    expect(Vector.scale [.5, 1.5], 2).toEqual [1, 3]

    expect(Vector.add [1, 2], [1, 1]).toEqual [2, 3]

    expect(Vector.sub [9, 5], [5, 2]).toEqual [4, 3]

    expect(Vector.mul [3, 5], [5, 5]).toEqual [15, 25]

    expect(Vector.div [15, 5], [5, 5]).toEqual [3, 1]

    expect(Vector.mod [13, 6], [5, 5]).toEqual [3, 1]

    expect(Vector.cartesianDistance [0, 0], [1, 1]).toBe Math.sqrt 2

    expect(Vector.min [-10, 10], [0, 0]).toEqual [-10, 0]

    expect(Vector.max [-10, 10], [0, 0]).toEqual [0, 10]

    expect(Vector.clamp [-10, 10], [0, 0], [5, 5]).toEqual [0, 5]

    expect(Vector.round [3.14, 4.70]).toEqual [3, 5]

    expect(Vector.dot [2, 3], [4, 5]).toEqual 23

    expect(Vector.normalize [5, 5], [6, 7]).toEqual [
      -0.4472135954999579, -0.8944271909999159
    ]

    expect(Vector.normalize [.5, .7]).toEqual [
      0.5812381937190965, 0.813733471206735
    ]

    expect(Vector.abs [23, -5.20]).toEqual [23, 5.20]

    expect(Vector.floor [3.14, 4.70]).toEqual [3, 4]

    expect(Vector.area [3, 6]).toBe 18

  it 'can deep copy', ->

    vector = [0, 0]
    vector2 = Vector.copy vector

    expect(Vector.equals vector, vector2).toBe true

    vector[0] = 1

    expect(Vector.equals vector, vector2).toBe false

  it 'can test for 0 or NULL', ->

    expect(Vector.isZero [0, 0]).toBe true
    expect(Vector.isZero [1, 0]).toBe false

    expect(Vector.isNull [0, 1]).toBe true
    expect(Vector.isNull [1, 1]).toBe false

    expect(Vector.isNull null).toBe true
    expect(Vector.isNull [1]).toBe true
    expect(Vector.isNull [1, 1, 1]).toBe true

  it 'can convert to/from directions', ->

    expect(Vector.toDirection4 [0, 1]).toBe 2
    expect(Vector.toDirection4 [1, 0]).toBe 1

    expect(Vector.toDirection8 [1, 1]).toBe 5
    expect(Vector.toDirection8 [1, 0]).toBe 1

    expect(Vector.toDirection [0, 1], 4).toBe 2

    for i in [0...8]
      vector = Vector.fromDirection i
      expect(i).toBe Vector.toDirection vector, 8

  it 'can convert to object', ->

    expect(Vector.toObject [0, 16]).toEqual x: 0, y: 16