mirror of
https://github.com/codeninjasllc/codecombat.git
synced 2024-11-29 18:45:48 -05:00
29 lines
794 B
CoffeeScript
29 lines
794 B
CoffeeScript
describe 'Vector', ->
|
|
Rectangle = require 'lib/world/rectangle'
|
|
Vector = require 'lib/world/vector'
|
|
|
|
it 'rotates properly', ->
|
|
v = new Vector 200, 300
|
|
v.rotate Math.PI / 2
|
|
expect(v.x).toBeCloseTo -300
|
|
expect(v.y).toBeCloseTo 200
|
|
|
|
v.rotate Math.PI / 4
|
|
expect(v.x).toBeCloseTo -250 * Math.sqrt 2
|
|
expect(v.y).toBeCloseTo -50 * Math.sqrt 2
|
|
|
|
it 'hardly moves when rotated a tiny bit', ->
|
|
v = new Vector -100.25, -101
|
|
v2 = v.copy()
|
|
v2.rotate 0.0000001 * Math.PI
|
|
expect(v.distance v2).toBeCloseTo 0
|
|
|
|
v = new Vector 100.25, -101
|
|
v2 = v.copy()
|
|
v2.rotate 1.99999999 * Math.PI
|
|
expect(v.distance v2).toBeCloseTo 0
|
|
|
|
v = new Vector 10.25, 301
|
|
v2 = v.copy()
|
|
v2.rotate -0.0000001 * Math.PI
|
|
expect(v.distance v2).toBeCloseTo 0
|