def affine(self, A, B):
c0, c1, c2, c3, c4, c5 = A[0], A[1], A[2], A[3], A[4], A[5]
C = Affine(c0, c1, c2, c3, c4, c5)
self.assertEqual(C, A)
E = Affine.identity()
self.assertEqual(C, C*E)
self.assertEqual(E*B, B)
self.assertEqual(E.det(), 1)
self.assertAlmostEqual(A.det(), c0*c3-c1*c2)
self.assertAlmostEqual(abs(A.det()), A.descrim2())
self.assertAlmostEqual(abs(A.det())**0.5, A.descrim())
#xor
self.assertFalse( A.flips() ^ (A.det() < 0) )
if A.is_singular():
self.assertAlmostEqual(A.det(), 0)
else:
self.assertTrue( Affine.are_near (A*A.inverse(), E) )
self.assertAlmostEqual(A.det(), 1/A.inverse().det())
self.assertEqual( A.x_axis(), Point(c0, c1) )
self.assertEqual( A.y_axis(), Point(c2, c3) )
self.assertEqual( A.translation(), Point(c4, c5) )
self.assertAlmostEqual(A.expansion_X(), A.x_axis().length())
self.assertAlmostEqual(A.expansion_Y(), A.y_axis().length())
if abs(A.expansion_X()) > 1e-7 and abs(A.expansion_Y()) > 1e-7:
A.set_expansion_X(2)
A.set_expansion_Y(3)
self.assertAlmostEqual(A.expansion_X(), 2)
self.assertAlmostEqual(A.expansion_Y(), 3)
A.set_identity()
self.assertTrue(A.is_identity())
self.assertTrue(A.is_translation())
self.assertFalse(A.is_nonzero_translation())
self.assertTrue(A.is_scale())
self.assertTrue(A.is_uniform_scale())
self.assertFalse(A.is_nonzero_scale())
self.assertFalse(A.is_nonzero_uniform_scale())
self.assertTrue(A.is_rotation())
self.assertFalse(A.is_nonzero_rotation())
self.assertTrue(A.is_HShear())
self.assertTrue(A.is_VShear())
self.assertFalse(A.is_nonzero_HShear())
self.assertFalse(A.is_nonzero_VShear())
self.assertTrue(A.is_zoom())
self.assertTrue(A.preserves_area() and A.preserves_angles() and A.preserves_distances())
self.assertFalse( A.flips() )
self.assertFalse( A.is_singular() )
A.set_X_axis(Point(c0, c1))
A.set_Y_axis(Point(c2, c3))
self.assertEqual(A.without_translation(), A)
A.set_translation(Point(c4, c5))
self.assertEqual(C, A)
self.assertAlmostEqual( (A*B).det(), A.det()*B.det() )
self.assertEqual( A.translation(), Point()*A )
self.assertEqual( Point(1, 1)*A, Point( c0+c2+c4, c1+c3+c5 ))
l = Line(Point(1, 1), 2)
self.assertEqual( (l.transformed(A)).origin(), l.origin()*A )
self.assertTrue( Line.are_near( l.point_at(3)*A, l.transformed(A) ) )
r = Ray(Point(2, 3), 4)
self.assertEqual( (r.transformed(A)).origin(), r.origin()*A )
self.assertTrue( Ray.are_near( r.point_at(3)*A, r.transformed(A) ) )
def affine(self, A, B):
c0, c1, c2, c3, c4, c5 = A[0], A[1], A[2], A[3], A[4], A[5]
C = Affine(c0, c1, c2, c3, c4, c5)
self.assertEqual(C, A)
E = Affine.identity()
self.assertEqual(C, C * E)
self.assertEqual(E * B, B)
self.assertEqual(E.det(), 1)
self.assertAlmostEqual(A.det(), c0 * c3 - c1 * c2)
self.assertAlmostEqual(abs(A.det()), A.descrim2())
self.assertAlmostEqual(abs(A.det())**0.5, A.descrim())
#xor
self.assertFalse(A.flips() ^ (A.det() < 0))
if A.is_singular():
self.assertAlmostEqual(A.det(), 0)
else:
self.assertTrue(Affine.are_near(A * A.inverse(), E))
self.assertAlmostEqual(A.det(), 1 / A.inverse().det())
self.assertEqual(A.x_axis(), Point(c0, c1))
self.assertEqual(A.y_axis(), Point(c2, c3))
self.assertEqual(A.translation(), Point(c4, c5))
self.assertAlmostEqual(A.expansion_X(), A.x_axis().length())
self.assertAlmostEqual(A.expansion_Y(), A.y_axis().length())
if abs(A.expansion_X()) > 1e-7 and abs(A.expansion_Y()) > 1e-7:
A.set_expansion_X(2)
A.set_expansion_Y(3)
self.assertAlmostEqual(A.expansion_X(), 2)
self.assertAlmostEqual(A.expansion_Y(), 3)
A.set_identity()
self.assertTrue(A.is_identity())
self.assertTrue(A.is_translation())
self.assertFalse(A.is_nonzero_translation())
self.assertTrue(A.is_scale())
self.assertTrue(A.is_uniform_scale())
self.assertFalse(A.is_nonzero_scale())
self.assertFalse(A.is_nonzero_uniform_scale())
self.assertTrue(A.is_rotation())
self.assertFalse(A.is_nonzero_rotation())
self.assertTrue(A.is_HShear())
self.assertTrue(A.is_VShear())
self.assertFalse(A.is_nonzero_HShear())
self.assertFalse(A.is_nonzero_VShear())
self.assertTrue(A.is_zoom())
self.assertTrue(A.preserves_area() and A.preserves_angles()
and A.preserves_distances())
self.assertFalse(A.flips())
self.assertFalse(A.is_singular())
A.set_X_axis(Point(c0, c1))
A.set_Y_axis(Point(c2, c3))
self.assertEqual(A.without_translation(), A)
A.set_translation(Point(c4, c5))
self.assertEqual(C, A)
self.assertAlmostEqual((A * B).det(), A.det() * B.det())
self.assertEqual(A.translation(), Point() * A)
self.assertEqual(Point(1, 1) * A, Point(c0 + c2 + c4, c1 + c3 + c5))
l = Line(Point(1, 1), 2)
self.assertEqual((l.transformed(A)).origin(), l.origin() * A)
self.assertTrue(Line.are_near(l.point_at(3) * A, l.transformed(A)))
r = Ray(Point(2, 3), 4)
self.assertEqual((r.transformed(A)).origin(), r.origin() * A)
self.assertTrue(Ray.are_near(r.point_at(3) * A, r.transformed(A)))
