def setUp(self):
# setup an instance of GeoParams
self.data_revol = GeoParams(22, {'sigma': 0})
self.data_prism = GeoParams(20, {'sigma': 1})
self.data_fixed = GeoParams(10, {'sigma': 2})
# setup data to compare against
self.frame = 33
# setup values to compare against
self.revol_theta = var('pi')
self.prism_r = 5
self.data_revol.theta = self.revol_theta
self.data_prism.r = self.prism_r
# setup params to compare against
self.param_sigma = 0
self.param_gamma = var('XX20')
self.param_alpha = var('YY20')
self.param_theta = var('ZZ20')
self.params = {
'sigma': self.param_sigma,
'gamma': self.param_gamma,
'alpha': self.param_alpha,
'theta': self.param_theta
}
self.wrong_param = {'rand': 'some-value'}
def test_init(self):
"""Test constructor"""
# test instance type
self.assertIsInstance(GeoParams(self.frame), GeoParams)
def __init__(
self, name, links=0, joints=0, frames=0,
is_floating=True, structure=tools.TREE, is_mobile=False,
is_symbolic=True
):
"""
Constructor period.
Usage:
"""
"""Name of the robot."""
self.name = name
"""Folder to store the files related to the robot."""
self.directory = filemgr.get_folder_path(name)
"""Total number of links in the robot."""
self.num_links = links
"""Total number of joints in the robot."""
self.num_joints = joints
"""Total number of frames in the robot."""
self.num_frames = frames
"""To indicate if the base is floating or not."""
self.is_floating = is_floating
"""Type of the robot structure - simple, tree, closed-loop"""
self.structure = structure
"""To indicate if the robot is a wheeled mobile robot"""
self.is_mobile = is_mobile
"""To indicate if computation should be symbolic or numeric"""
self.is_symbolic = is_symbolic
# properties dependent on number of links
"""
List to hold the dynamic parameters. The indices of the list
start with 0 and it corresponds to parameters of link 0 (virtual
link of the base).
"""
self.dyns = [DynParams(j) for j in self.link_nums]
# properties dependent on number of joints
"""
To indicate if a joint is rigid or flexible. 0 for rigid and 1
for flexible. The indices of the list start with 0 and
corresponds to a virtual joint of the base. This joint is
usually rigid.
"""
self.etas = [0 for j in self.joint_nums]
"""Joint stiffness usually indicated by k."""
self.stiffness = [0 for j in self.joint_nums]
"""Joint velocities."""
self.qdots = [var('QP{0}'.format(j)) for j in self.joint_nums]
"""Joint accelerations."""
self.qddots = [var('QDP{0}'.format(j)) for j in self.joint_nums]
"""Joint torques."""
self.torques = [var('GAM{0}'.format(j)) for j in self.joint_nums]
# properties dependent on number of frames
"""
List to hold the geometric parameters. NOTE: This might be moved
to a separate function.
The indices of the list start with 0 and the first object
corresponds to parameters of frame 0 (base) wrt its antecedent
(some arbitary reference frame).
"""
self.geos = [GeoParams(j) for j in self.frame_nums]
# properties independent of number of links, joints and frames
"""Gravity vector a 3x1 Matrix."""
self.gravity = Matrix([0, 0, var('G3')])
# the values of properties below would be modified during
# the computation of dynamic models.
"""Base velocity 6x1 column vector - a Screw."""
self.base_vel = Screw()
"""Base acceleration 6x1 column vector - a Screw."""
self.base_accel = Screw()
"""Transformation matrix of base wrt a reference frame at time 0."""
self.base_tmat = eye(4)
# call init methods
self._init_maps()
