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"""
tracktable.feature.interpolated_points - Generate points along a path
"""
from __future__ import division, print_function, absolute_import
import datetime
import random
from tracktable.core import geomath
from six.moves import range
[docs]class TrajectoryPointSource(object):
"""Generate points interpolated between start and finish.
Attributes:
start_point (TrajectoryPoint): Location for first point
end_point (TrajectoryPoint): Location for last point
num_points (integer): Number of points in the path (at least 2)
"""
def __init__(self):
"""Initialize an empty point source."""
self.start_point = None
self.end_point = None
self.num_points = None
[docs] def points(self):
"""Return an iterable containing the generated points in the trajectory.
Longitude, latitude, altitude (if present) and time will be
interpolated evenly from start_point to end_point and
start_time to end_time. Each point will have the object ID
specified in self.object_id.
Returns:
An iterable of TrajectoryPoint instances
Raises:
ValueError: impossible / illegal values specified for one or more parameters
"""
# Sanity checks first
if self.start_point is None or self.end_point is None:
raise ValueError("TrajectoryPointSource: You must specify both start_point and end_point")
if self.num_points is None or self.num_points < 2:
raise ValueError("TrajectoryPointSource: You must specify num_points and its value must be at least 2")
for i in range(self.num_points):
interpolant = i * (1.0 / (self.num_points - 1))
yield( geomath.interpolate(self.start_point, self.end_point, interpolant) )