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82 lines
2.7 KiB
CoffeeScript
82 lines
2.7 KiB
CoffeeScript
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describe 'Rectangle', ->
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Rectangle = require 'lib/world/rectangle'
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Vector = require 'lib/world/vector'
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it 'contains its own center', ->
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rect = new Rectangle 0, 0, 10, 10
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expect(rect.containsPoint(new Vector 0, 0)).toBe true
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it 'contains a point when rotated', ->
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rect = new Rectangle 0, -20, 40, 40, 3 * Math.PI / 4
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p = new Vector 0, 2
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expect(rect.containsPoint(p, true)).toBe true
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it 'correctly calculates distance to a faraway point', ->
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rect = new Rectangle 100, 50, 20, 40
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p = new Vector 200, 300
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d = 10 * Math.sqrt(610)
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expect(rect.distanceToPoint(p)).toBeCloseTo d
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rect.rotation = Math.PI / 2
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d = 80 * Math.sqrt(10)
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expect(rect.distanceToPoint(p)).toBeCloseTo d
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it 'does not modify itself or target Vector when calculating distance', ->
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rect = new Rectangle -100, -200, 1, 100
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rect2 = rect.copy()
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p = new Vector -100.25, -101
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p2 = p.copy()
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rect.distanceToPoint(p)
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expect(p.x).toEqual p2.x
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expect(p.y).toEqual p2.y
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expect(rect.x).toEqual rect2.x
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expect(rect.y).toEqual rect2.y
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expect(rect.width).toEqual rect2.width
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expect(rect.height).toEqual rect2.height
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expect(rect.rotation).toEqual rect2.rotation
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it 'correctly calculates distance to contained point', ->
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rect = new Rectangle -100, -200, 1, 100
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rect2 = rect.copy()
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p = new Vector -100.25, -160
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p2 = p.copy()
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expect(rect.distanceToPoint(p)).toBe 0
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rect.rotation = 0.00000001 * Math.PI
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expect(rect.distanceToPoint(p)).toBe 0
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it 'has predictable vertices', ->
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rect = new Rectangle 50, 50, 100, 100
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v = rect.vertices()
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expect(v[0].x).toEqual 0
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expect(v[0].y).toEqual 0
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expect(v[1].x).toEqual 0
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expect(v[1].y).toEqual 100
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expect(v[2].x).toEqual 100
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expect(v[2].y).toEqual 100
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expect(v[3].x).toEqual 100
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expect(v[3].y).toEqual 0
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it 'has predictable vertices when rotated', ->
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rect = new Rectangle 50, 50, 100, 100, Math.PI / 4
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v = rect.vertices()
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d = (Math.sqrt(2 * 100 * 100) - 100) / 2
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expect(v[0].x).toBeCloseTo -d
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expect(v[0].y).toBeCloseTo 50
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expect(v[1].x).toBeCloseTo 50
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expect(v[1].y).toBeCloseTo 100 + d
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expect(v[2].x).toBeCloseTo 100 + d
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expect(v[2].y).toBeCloseTo 50
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expect(v[3].x).toBeCloseTo 50
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expect(v[3].y).toBeCloseTo -d
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it 'is its own AABB when not rotated', ->
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rect = new Rectangle 10, 20, 30, 40
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aabb = rect.axisAlignedBoundingBox()
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for prop in ["x", "y", "width", "height"]
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expect(rect[prop]).toBe aabb[prop]
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it 'is its own AABB when rotated 180', ->
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rect = new Rectangle 10, 20, 30, 40, Math.PI
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aabb = rect.axisAlignedBoundingBox()
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for prop in ["x", "y", "width", "height"]
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expect(rect[prop]).toBe aabb[prop]
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