def test_to_invalid(self):
"""Calling the to() method with invalid arguements."""
# two nodes, not linked so each forms a seperate scenegraph
a = Node()
b = Node()
with self.assertRaises(ValueError, msg="Attempting to find a transform between two independent scenegraphs should have raised a ValueError exception."):
a.to(b)
with self.assertRaises(TypeError, msg="Passing an invalid arguement (a string) did not raise a TypeError."):
a.to("bad input")
def test_to_invalid(self):
"""Calling the to() method with invalid arguements."""
# two nodes, not linked so each forms a seperate scenegraph
a = Node()
b = Node()
with self.assertRaises(ValueError, msg="Attempting to find a transform between two independent scenegraphs should have raised a ValueError exception."):
a.to(b)
with self.assertRaises(TypeError, msg="Passing an invalid arguement (a string) did not raise a TypeError."):
a.to("bad input")
def test_to(self):
"""Test the to() method returns a matrix transform between nodes.
The returned affine matrix should transform a point in the coordinate
space defined by the calling node to the coordinate space defined by the
specified node in the tree."""
# build test tree
root = Node()
a1 = Node(root, translate(1,0,0))
a2 = Node(a1, translate(10,0,0))
b1 = Node(root, translate(0,1,0))
b2 = Node(b1, translate(0,10,0))
c = Node(root, translate(0,0,1))
# test a2 to root
self.assertTransformAlmostEqual(a2.to(root), translate(11,0,0), delta = 1e-14, msg="The a2.to(root) transform is incorrect.")
# test b2 to root
self.assertTransformAlmostEqual(b2.to(root), translate(0,11,0), delta = 1e-14, msg="The b2.to(root) transform is incorrect.")
# test a2 to b2
self.assertTransformAlmostEqual(a2.to(b2), translate(11,-11,0), delta = 1e-14, msg="The a2.to(b2) transform is incorrect.")
# test b2 to a2
self.assertTransformAlmostEqual(b2.to(a2), translate(-11,11,0), delta = 1e-14, msg="The b2.to(a2) transform is incorrect.")
# test a2 to c
self.assertTransformAlmostEqual(a2.to(c), translate(11,0,-1), delta = 1e-14, msg="The a2.to(c) transform is incorrect.")
# test c to b1
self.assertTransformAlmostEqual(c.to(b1), translate(0,-1,1), delta = 1e-14, msg="The c.to(b1) transform is incorrect.")
def test_to(self):
"""Test the to() method returns a matrix transform between nodes.
The returned affine matrix should transform a point in the coordinate
space defined by the calling node to the coordinate space defined by the
specified node in the tree."""
# build test tree
root = Node()
a1 = Node(root, translate(1,0,0))
a2 = Node(a1, translate(10,0,0))
b1 = Node(root, translate(0,1,0))
b2 = Node(b1, translate(0,10,0))
c = Node(root, translate(0,0,1))
# test a2 to root
self.assertTransformAlmostEqual(a2.to(root), translate(11,0,0), delta = 1e-14, msg="The a2.to(root) transform is incorrect.")
# test b2 to root
self.assertTransformAlmostEqual(b2.to(root), translate(0,11,0), delta = 1e-14, msg="The b2.to(root) transform is incorrect.")
# test a2 to b2
self.assertTransformAlmostEqual(a2.to(b2), translate(11,-11,0), delta = 1e-14, msg="The a2.to(b2) transform is incorrect.")
# test b2 to a2
self.assertTransformAlmostEqual(b2.to(a2), translate(-11,11,0), delta = 1e-14, msg="The b2.to(a2) transform is incorrect.")
# test a2 to c
self.assertTransformAlmostEqual(a2.to(c), translate(11,0,-1), delta = 1e-14, msg="The a2.to(c) transform is incorrect.")
# test c to b1
self.assertTransformAlmostEqual(c.to(b1), translate(0,-1,1), delta = 1e-14, msg="The c.to(b1) transform is incorrect.")