test_geometry.py

Go to the documentation of this file.

from __future__ import print_function

from geometry import *
import numpy as np
from numpy import cos,sin

verbose = True

def isapprox(a,b,epsilon=1e-6):
    if issubclass(a.__class__,np.ndarray) and issubclass(b.__class__,np.ndarray):
        return np.allclose(a,b,epsilon)
    else:
        return abs(a-b)<epsilon

# --- Quaternion ---------------------------------------------------------------
q = Quaternion(1,2,3,4)
q.normalize()
assert(isapprox(np.linalg.norm(q.coeffs()),q.norm()))
assert(isapprox(np.linalg.norm(q.coeffs()),1))

v = np.array([0.5,-0.5,0.5,0.5])
qv = Quaternion(v)
assert(isapprox(qv.coeffs(), v))

r = AngleAxis(q)
q2 = Quaternion(r)
assert(q==q)
assert(isapprox(q.coeffs(),q2.coeffs()))
assert(q2.isApprox(q2))
assert(q2.isApprox(q2,1e-2))

Rq = q.matrix()
Rr = r.matrix()
assert(isapprox(Rq.dot(Rq.T),np.eye(3)))
assert(isapprox(Rr,Rq))

qR = Quaternion(Rr)
assert(q.isApprox(qR))
assert(isapprox(q.coeffs(),qR.coeffs()))

assert(isapprox(qR[3],1./np.sqrt(30)))
try:
   qR[5]
   print("Error, this message should not appear.")
except RuntimeError as e:
  if verbose: print("As expected, catched exception: ",e)

# --- Angle Vector ------------------------------------------------
r = AngleAxis(.1,np.array([1,0,0],np.double))
if verbose: print("Rx(.1) = \n\n",r.matrix(),"\n")
assert( isapprox(r.matrix()[2,2],cos(r.angle)))
assert( isapprox(r.axis,np.array([1.,0,0])) )
assert( isapprox(r.angle,0.1) )
assert(r.isApprox(r))
assert(r.isApprox(r,1e-2))

r.axis = np.array([0,1,0],np.double).T
assert( isapprox(r.matrix()[0,0],cos(r.angle)))

ri = r.inverse()
assert( isapprox(ri.angle,-.1) )

R = r.matrix()
r2 = AngleAxis(np.dot(R,R))
assert( isapprox(r2.angle,r.angle*2) )

# --- USER FUNCTIONS -----------------------------------------------------------
ro = testOutAngleAxis()
assert(ro.__class__ == AngleAxis)
res = testInAngleAxis(r)
assert( res==r.angle )

qo = testOutQuaternion()
assert(qo.__class__ == Quaternion)
res = testInQuaternion(q)
assert(q.norm() == res)