.. _example08:

Example 8 - Drawing Particle Travel Paths (ANUGA)
=================================================

In this example, we will use the particles movement simulated in :ref:`example01`, and visualize some of the particle travel paths.

Full example script available :download:`here <../../../examples/draw_anuga_particle_paths.py>`.

First run :ref:`example01`, and then we can access and use the particle travel information output by that example.

.. doctest::

   >>> import numpy as np
   >>> import os
   >>> import json
   >>> from dorado.routines import draw_travel_path
   >>> data = np.load('ex_anuga_data.npz')
   >>> depth = data['depth']
   >>> all_walk_data = json.load(open('steady_anuga_example'+os.sep+'data'+os.sep+'data.txt'))

Now we will apply the `draw_travel_path` function. In this example we are going to visualize the travel paths of the first 4 particles, indicated by the list we are providing to the `draw_travel_path` function. We will show every other iteration to visually simplify the path, controlled by `interval` parameter.

.. doctest::

   >>> draw_travel_path(depth, all_walk_data, [0, 1, 2, 3],
   >>>                  'steady_anuga_example'+os.sep+'figs'+os.sep+'travel_paths.png',
   >>>                  interval=2, plot_legend=True)

.. image:: images/example08/travel_paths.png