plotting.rst

.. currentmodule:: ichthyop

Plotting

Drawing trajectories

The reading of |ich| datasets is performed by using the :py:func:`plot.map_traj` function.

.. ipython:: python
    :suppress:

    import os
    cwd = os.getcwd()
    print(cwd)

    fpath = "_static/examples/plot_dataset.py"
    with open(fpath) as f:
        code = compile(f.read(), fpath, 'exec')
    exec(code)

.. literalinclude:: _static/examples/plot_dataset.py

Movies

.. ipython:: python
    :suppress:

    import os
    cwd = os.getcwd()
    print(cwd)

    fpath = "_static/examples/make_movie.py"
    with open(fpath) as f:
        code = compile(f.read(), fpath, 'exec')
    exec(code)

.. ipython:: python
    :suppress:

    import os
    import subprocess
    cwd = os.getcwd()

    subprocess.call(['mkdir', '-p', '_build/html/_static'])
    subprocess.call(['cp', '-prfv', '_static/movie.ogg', '_build/html/_static'])

The :py:func:`plot.make_movie` allows to make movies of the drifter trajectories.

This function makes a series of :samp:`.png` files: 'temp_00000.png', 'temp_00001.png`, etc. These files can be converted into a movie by using either _mencoder or _ffmpeg. This can be done from the terminal:

ffmpeg -y -framerate 24 -pattern_type glob -i 'temp*png' -qscale:v 1 movie.avi

or directly from python

import os
os.system("ffmpeg -y -framerate 24 -pattern_type glob -i 'temp*.png' -qscale:v 1 movie.avi")

The :samp:`-y` option allows overwritting without asking, the :samp:`-framerate` option defines the number of frames per second, the :samp:`-pattern_type glob -i 'temp*.png'` option defines the names of the :samp:`.png` files that will be used, and the -qscale:v 1 is the quality factor.

.. literalinclude:: _static/examples/make_movie.py