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30 lines
794 B
CoffeeScript
30 lines
794 B
CoffeeScript
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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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