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82 lines
2.7 KiB
CoffeeScript
82 lines
2.7 KiB
CoffeeScript
describe 'Vector', ->
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Rectangle = require 'lib/world/rectangle'
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Vector = require 'lib/world/vector'
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it 'rotates properly', ->
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v = new Vector 200, 300
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v.rotate Math.PI / 2
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expect(v.x).toBeCloseTo -300
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expect(v.y).toBeCloseTo 200
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v.rotate Math.PI / 4
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expect(v.x).toBeCloseTo -250 * Math.sqrt 2
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expect(v.y).toBeCloseTo -50 * Math.sqrt 2
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it 'hardly moves when rotated a tiny bit', ->
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v = new Vector -100.25, -101
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v2 = v.copy()
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v2.rotate 0.0000001 * Math.PI
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expect(v.distance v2).toBeCloseTo 0
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v = new Vector 100.25, -101
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v2 = v.copy()
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v2.rotate 1.99999999 * Math.PI
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expect(v.distance v2).toBeCloseTo 0
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v = new Vector 10.25, 301
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v2 = v.copy()
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v2.rotate -0.0000001 * Math.PI
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expect(v.distance v2).toBeCloseTo 0
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it 'has class methods equivalent to the instance methods', ->
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expectEquivalentMethods = (method, arg) ->
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v = new Vector 7, 7
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classResult = Vector[method](v, arg)
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instanceResult = v[method](arg)
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expect(classResult).toEqual instanceResult
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expectEquivalentMethods 'add', new Vector 1, 1
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expectEquivalentMethods 'subtract', new Vector 3, 3
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expectEquivalentMethods 'multiply', 4
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expectEquivalentMethods 'divide', 2
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expectEquivalentMethods 'limit', 3
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expectEquivalentMethods 'normalize'
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expectEquivalentMethods 'rotate', 0.3
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expectEquivalentMethods 'magnitude'
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expectEquivalentMethods 'heading'
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expectEquivalentMethods 'distance', new Vector 2, 2
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expectEquivalentMethods 'distanceSquared', new Vector 4, 4
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expectEquivalentMethods 'dot', new Vector 3, 3
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expectEquivalentMethods 'equals', new Vector 7, 7
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expectEquivalentMethods 'copy'
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xit "doesn't mutate when in player code", ->
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# We can't run these tests easily because it depends on being in interpreter mode now
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expectNoMutation = (fn) ->
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v = new Vector 5, 5
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v2 = fn v
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expect(v.x).toEqual 5
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expect(v).not.toBe v2
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expectNoMutation (v) -> v.normalize()
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expectNoMutation (v) -> v.limit 2
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expectNoMutation (v) -> v.subtract new Vector 2, 2
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expectNoMutation (v) -> v.add new Vector 2, 2
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expectNoMutation (v) -> v.divide 2
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expectNoMutation (v) -> v.multiply 2
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expectNoMutation (v) -> v.rotate 0.5
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it 'mutates when not in player code', ->
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expectMutation = (fn) ->
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v = new Vector 5, 5
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v2 = fn v
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expect(v.x).not.toEqual 5
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expect(v).toBe v2
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expectMutation (v) -> v.normalize()
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expectMutation (v) -> v.limit 2
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expectMutation (v) -> v.subtract new Vector 2, 2
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expectMutation (v) -> v.add new Vector 2, 2
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expectMutation (v) -> v.divide 2
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expectMutation (v) -> v.multiply 2
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expectMutation (v) -> v.rotate 0.5
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