surfaces/surf/test/vertex.py

import unittest

from surf.geometry import Vertex


class TestVertex(unittest.TestCase):

    def setUp(self):
        self.origin = Vertex(0, 0, 0)
        self.v1 = Vertex(-1, -1, -1)
        self.v2 = Vertex(1, 1, 1)

        self.v3 = Vertex(5, 4, 3)
        self.v4 = Vertex(10, -2, 13)
        self.v5 = Vertex(-4, 15.3, 100)

    def test_addition(self):
        added_v = self.v1 + self.v2
        self.assertEqual(added_v, self.origin)
        self.assertEqual(self.v3 + self.v4, Vertex(15, 2, 16))

    def test_summation(self):
        v = sum((self.v1, self.v2, self.v3, self.v4), Vertex())
        self.assertEqual(v, Vertex(15, 2, 16))
        v = sum((self.v1, self.v2, self.v3, self.v4, self.v5), Vertex())
        self.assertEqual(v, Vertex(11, 17.3, 116))

    def test_float_int_division(self):
        v1 = self.v1 / 2
        v2 = self.v1 / 2.0
        self.assertEqual(v1, v2)

    def test_division(self):
        v1 = Vertex(36, 12, 48)
        v2 = v1 / 12
        self.assertEqual(v2, Vertex(3, 1, 4))
        v1 = Vertex(36.0, 12.0, 48.0)
        v2 = v1 / 12.0
        self.assertEqual(v2, Vertex(3.0, 1.0, 4.0))
        v1 = Vertex(36, 12, 48)
        v2 = v1 / 12.0
        self.assertEqual(v2, Vertex(3, 1, 4))
        v1 = Vertex(36., 12., 48.)
        v2 = v1 / 12
        self.assertEqual(v2, Vertex(3.0, 1.0, 4.0))

    def test_inappropriate_division(self):
        with self.assertRaises(TypeError):
            self.v1 / self.v2
        with self.assertRaises(TypeError):
            1.0 / self.v1
        with self.assertRaises(TypeError):
            self.v1 / 'asdf'

    def test_multiply(self):
        self.assertEqual(type(self.v1 * 2), Vertex)
        self.assertEqual(type(self.v1 * self.v1), Vertex)
        self.assertEqual(self.v1 * 2, Vertex(-2, -2, -2))
        self.assertEqual(self.v1 * self.v1, Vertex(0, 0, 0))
        self.assertEqual(self.v1 * self.v2, Vertex(0, 0, 0))
        self.assertEqual(self.v3 * self.v4, Vertex(58, -35, -50))

    def test_cross(self):
        i = Vertex(1, 0, 0)
        j = Vertex(0, 1, 0)
        k = Vertex(0, 0, 1)

        self.assertEqual(i * j, k)
        self.assertEqual(j * k, i)
        self.assertEqual(k * i, j)

        self.assertEqual(j * i, -k)
        self.assertEqual(k * j, -i)
        self.assertEqual(i * k, -j)

        self.assertEqual(i * i, self.origin)
        self.assertEqual(j * j, self.origin)
        self.assertEqual(k * k, self.origin)

    def test_negative(self):
        self.assertEqual(-self.v1, self.v2)
        self.assertEqual(-self.v2, self.v1)


if __name__ == '__main__':
    unittest.main(verbosity=3)