@jscad/modeling/src/maths/mat4/rotate.test.js

Constructive Solid Geometry (CSG) Library for JSCAD

const test = require('ava')
const { rotate, create } = require('./index')

const { compareVectors } = require('../../../test/helpers/index')

test('mat4: rotate() called with out parameter should return a new mat4 with correct values', (t) => {
  const rotation = 90 * 0.017453292519943295

  const idn = create()

  // invalid condition when axis is 0,0,0
  const out1 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
  const ret1 = rotate(out1, idn, rotation, [0, 0, 0])
  t.is(out1, ret1)
  t.true(compareVectors(out1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]))

  const out2 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
  const ret2 = rotate(out2, idn, rotation, [0, 0, 1])
  t.true(compareVectors(out2, [0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]))
  t.true(compareVectors(ret2, [0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]))
  t.is(out2, ret2)

  const out3 = create()
  const ret3 = rotate(out3, out3, -rotation, [0, 0, 1])
  t.true(compareVectors(out3, [0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]))
  t.true(compareVectors(ret3, [0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]))
})