def __constrain(self, vector, axis):
"""
private constrain (used to constrain axis)
"""
res = PVector.sub(vector, PVector.mult(axis, PVector.dot(axis, vector)))
res.normalize()
return res
def mouseDragged(self, x, y):
"""
pass in mouse.x and mouse.y parameters from sketch
"""
self.v_drag = self.__mouse2sphere(x, y)
self.q_drag.set(PVector.dot(self.v_down, self.v_drag),
self.v_down.cross(self.v_drag))
def __constrain(self, vector, axis):
"""
private constrain (used to constrain axis)
"""
res = PVector.sub(vector, PVector.mult(axis, PVector.dot(axis,
vector)))
res.normalize()
return res
class TestPVectorMethods(unittest.TestCase): def setUp(self): self.A = PVector(1, 0) self.B = PVector(0, 5) self.C = PVector(3,4) self.D = PVector(4, 4) def test_cross(self): # <1, 0> x <0, 5> = 5 - 0 = 5 self.assertEqual(self.A.cross(self.B), 5) # switching order should be inverse self.assertEqual(self.B.cross(self.A), -5) def test_dot(self): # <3, 4> * <4, 4> = 3*4 + 4*4 = 12 + 16 = 28 self.assertEqual(self.C.dot(self.D), 28) def test_mag(self): # sqrt(3**2 + 4**2) = 5 self.assertEqual(self.C.mag(), 5) def test_theta(self): self.assertEqual(self.A.theta(), 0) self.assertEqual(self.B.theta(), 90) self.assertEqual(self.D.theta(), 45) def test_theta_radians(self): # 45 degrees is pi/4 self.assertAlmostEqual(self.D.theta(degree=False), 3.14159/4.0, places=2) def test_setMag(self): self.A.setMag(self.B.mag()) self.assertEqual(self.A.mag(), self.B.mag()) def test_scale(self): self.B.scale(2) # 2 * 5 is 10 self.assertEqual(self.B.mag(), 10) self.B.scale(-2) # opposite length is still length self.assertEqual(self.B.mag(), 20) def test_norm(self): self.C.norm() self.assertEqual(self.C.mag(), 1) def test_rotate(self): self.A.rotate(90) self.assertEqual(self.A.theta(), self.B.theta()) def test_angle_between(self): self.A.x, self.A.y = 0, 1 self.assertEqual(self.A.get_angle_between(self.B), 0) self.assertAlmostEqual(self.D.get_angle_between(self.A), 45)
def mouseDragged(self, x, y):
"""
pass in mouse.x and mouse.y parameters from sketch
"""
self.v_drag = self.__mouse2sphere(x, y)
self.q_drag.set(PVector.dot(self.v_down, self.v_drag), self.v_down.cross(self.v_drag))
