@jscad/modeling/src/maths/plane/fromPoints.test.js

Constructive Solid Geometry (CSG) Library for JSCAD

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

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

test('plane: fromPoints() should return a new plane with correct values', (t) => {
  const obs1 = fromPoints(create(), [0, 0, 0], [1, 0, 0], [1, 1, 0])
  t.true(compareVectors(obs1, [0, 0, 1, 0]))

  const obs2 = fromPoints(obs1, [0, 6, 0], [0, 2, 2], [0, 6, 6])
  t.true(compareVectors(obs2, [-1, 0, 0, 0]))

  // planes created from the same points results in an invalid plane
  const obs3 = fromPoints(obs1, [0, 6, 0], [0, 6, 0], [0, 6, 0])
  t.true(compareVectors(obs3, [0 / 0, 0 / 0, 0 / 0, 0 / 0]))

  // polygon with co-linear vertices
  const obs4 = fromPoints(obs1, [0, 0, 0], [1, 0, 0], [2, 0, 0], [0, 1, 0])
  t.true(compareVectors(obs4, [0, 0, 1, 0]))
})