1765 lines
66 KiB
Python
1765 lines
66 KiB
Python
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# TODO:
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# * Documentation -- this will need a new section of the User's Guide.
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# Both for Animations and just timers.
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# - Also need to update http://www.scipy.org/Cookbook/Matplotlib/Animations
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# * Blit
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# * Currently broken with Qt4 for widgets that don't start on screen
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# * Still a few edge cases that aren't working correctly
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# * Can this integrate better with existing matplotlib animation artist flag?
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# - If animated removes from default draw(), perhaps we could use this to
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# simplify initial draw.
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# * Example
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# * Frameless animation - pure procedural with no loop
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# * Need example that uses something like inotify or subprocess
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# * Complex syncing examples
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# * Movies
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# * Can blit be enabled for movies?
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# * Need to consider event sources to allow clicking through multiple figures
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import abc
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import base64
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import contextlib
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from io import BytesIO, TextIOWrapper
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import itertools
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import logging
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import os
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from pathlib import Path
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import platform
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import shutil
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import subprocess
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import sys
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from tempfile import TemporaryDirectory
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import uuid
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import numpy as np
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import matplotlib as mpl
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from matplotlib._animation_data import (
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DISPLAY_TEMPLATE, INCLUDED_FRAMES, JS_INCLUDE, STYLE_INCLUDE)
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from matplotlib import cbook, rcParams, rcParamsDefault, rc_context
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_log = logging.getLogger(__name__)
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# Process creation flag for subprocess to prevent it raising a terminal
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# window. See for example:
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# https://stackoverflow.com/questions/24130623/using-python-subprocess-popen-cant-prevent-exe-stopped-working-prompt
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if platform.system() == 'Windows':
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subprocess_creation_flags = CREATE_NO_WINDOW = 0x08000000
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else:
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# Apparently None won't work here
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subprocess_creation_flags = 0
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# Other potential writing methods:
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# * http://pymedia.org/
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# * libming (produces swf) python wrappers: https://github.com/libming/libming
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# * Wrap x264 API:
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# (http://stackoverflow.com/questions/2940671/
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# how-to-encode-series-of-images-into-h264-using-x264-api-c-c )
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def adjusted_figsize(w, h, dpi, n):
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'''Compute figure size so that pixels are a multiple of n
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Parameters
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----------
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w, h : float
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Size in inches
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dpi : float
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The dpi
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n : int
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The target multiple
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Returns
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-------
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wnew, hnew : float
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The new figure size in inches.
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'''
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# this maybe simplified if / when we adopt consistent rounding for
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# pixel size across the whole library
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def correct_roundoff(x, dpi, n):
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if int(x*dpi) % n != 0:
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if int(np.nextafter(x, np.inf)*dpi) % n == 0:
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x = np.nextafter(x, np.inf)
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elif int(np.nextafter(x, -np.inf)*dpi) % n == 0:
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x = np.nextafter(x, -np.inf)
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return x
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wnew = int(w * dpi / n) * n / dpi
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hnew = int(h * dpi / n) * n / dpi
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return (correct_roundoff(wnew, dpi, n), correct_roundoff(hnew, dpi, n))
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# A registry for available MovieWriter classes
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class MovieWriterRegistry(object):
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'''Registry of available writer classes by human readable name.'''
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def __init__(self):
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self.avail = dict()
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self._registered = dict()
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self._dirty = False
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def set_dirty(self):
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"""Sets a flag to re-setup the writers."""
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self._dirty = True
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def register(self, name):
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"""Decorator for registering a class under a name.
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Example use::
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@registry.register(name)
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class Foo:
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pass
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"""
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def wrapper(writerClass):
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self._registered[name] = writerClass
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if writerClass.isAvailable():
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self.avail[name] = writerClass
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return writerClass
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return wrapper
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def ensure_not_dirty(self):
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"""If dirty, reasks the writers if they are available"""
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if self._dirty:
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self.reset_available_writers()
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def reset_available_writers(self):
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"""Reset the available state of all registered writers"""
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self.avail = {name: writerClass
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for name, writerClass in self._registered.items()
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if writerClass.isAvailable()}
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self._dirty = False
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def list(self):
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'''Get a list of available MovieWriters.'''
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self.ensure_not_dirty()
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return list(self.avail)
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def is_available(self, name):
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'''Check if given writer is available by name.
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Parameters
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----------
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name : str
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Returns
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-------
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available : bool
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'''
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self.ensure_not_dirty()
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return name in self.avail
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def __getitem__(self, name):
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self.ensure_not_dirty()
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if not self.avail:
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raise RuntimeError("No MovieWriters available!")
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try:
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return self.avail[name]
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except KeyError:
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raise RuntimeError(
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'Requested MovieWriter ({}) not available'.format(name))
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writers = MovieWriterRegistry()
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class AbstractMovieWriter(abc.ABC):
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'''
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Abstract base class for writing movies. Fundamentally, what a MovieWriter
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does is provide is a way to grab frames by calling grab_frame().
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setup() is called to start the process and finish() is called afterwards.
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This class is set up to provide for writing movie frame data to a pipe.
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saving() is provided as a context manager to facilitate this process as::
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with moviewriter.saving(fig, outfile='myfile.mp4', dpi=100):
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# Iterate over frames
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moviewriter.grab_frame(**savefig_kwargs)
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The use of the context manager ensures that setup() and finish() are
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performed as necessary.
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An instance of a concrete subclass of this class can be given as the
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``writer`` argument of `Animation.save()`.
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'''
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@abc.abstractmethod
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def setup(self, fig, outfile, dpi=None):
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'''
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Perform setup for writing the movie file.
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Parameters
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----------
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fig : `~matplotlib.figure.Figure`
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The figure object that contains the information for frames
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outfile : string
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The filename of the resulting movie file
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dpi : int, optional
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The DPI (or resolution) for the file. This controls the size
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in pixels of the resulting movie file. Default is ``fig.dpi``.
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'''
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@abc.abstractmethod
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def grab_frame(self, **savefig_kwargs):
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'''
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Grab the image information from the figure and save as a movie frame.
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All keyword arguments in savefig_kwargs are passed on to the `savefig`
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command that saves the figure.
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'''
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@abc.abstractmethod
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def finish(self):
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'''Finish any processing for writing the movie.'''
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@contextlib.contextmanager
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def saving(self, fig, outfile, dpi, *args, **kwargs):
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'''
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Context manager to facilitate writing the movie file.
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``*args, **kw`` are any parameters that should be passed to `setup`.
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'''
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# This particular sequence is what contextlib.contextmanager wants
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self.setup(fig, outfile, dpi, *args, **kwargs)
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try:
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yield self
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finally:
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self.finish()
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class MovieWriter(AbstractMovieWriter):
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'''Base class for writing movies.
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This is a base class for MovieWriter subclasses that write a movie frame
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data to a pipe. You cannot instantiate this class directly.
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See examples for how to use its subclasses.
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Attributes
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----------
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frame_format : str
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The format used in writing frame data, defaults to 'rgba'
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fig : `~matplotlib.figure.Figure`
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The figure to capture data from.
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This must be provided by the sub-classes.
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'''
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def __init__(self, fps=5, codec=None, bitrate=None, extra_args=None,
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metadata=None):
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'''MovieWriter
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Parameters
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----------
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fps : int
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Framerate for movie.
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codec : string or None, optional
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The codec to use. If ``None`` (the default) the ``animation.codec``
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rcParam is used.
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bitrate : int or None, optional
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The bitrate for the saved movie file, which is one way to control
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the output file size and quality. The default value is ``None``,
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which uses the ``animation.bitrate`` rcParam. A value of -1
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implies that the bitrate should be determined automatically by the
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underlying utility.
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extra_args : list of strings or None, optional
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A list of extra string arguments to be passed to the underlying
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movie utility. The default is ``None``, which passes the additional
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arguments in the ``animation.extra_args`` rcParam.
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metadata : Dict[str, str] or None
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A dictionary of keys and values for metadata to include in the
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output file. Some keys that may be of use include:
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title, artist, genre, subject, copyright, srcform, comment.
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'''
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if self.__class__ is MovieWriter:
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# TODO MovieWriter is still an abstract class and needs to be
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# extended with a mixin. This should be clearer in naming
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# and description. For now, just give a reasonable error
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# message to users.
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raise TypeError(
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'MovieWriter cannot be instantiated directly. Please use one '
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'of its subclasses.')
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self.fps = fps
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self.frame_format = 'rgba'
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if codec is None:
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self.codec = rcParams['animation.codec']
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else:
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self.codec = codec
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if bitrate is None:
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self.bitrate = rcParams['animation.bitrate']
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else:
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self.bitrate = bitrate
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if extra_args is None:
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self.extra_args = list(rcParams[self.args_key])
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else:
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self.extra_args = extra_args
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if metadata is None:
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self.metadata = dict()
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else:
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self.metadata = metadata
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@property
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def frame_size(self):
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'''A tuple ``(width, height)`` in pixels of a movie frame.'''
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w, h = self.fig.get_size_inches()
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return int(w * self.dpi), int(h * self.dpi)
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def _adjust_frame_size(self):
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if self.codec == 'h264':
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wo, ho = self.fig.get_size_inches()
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w, h = adjusted_figsize(wo, ho, self.dpi, 2)
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if not (wo, ho) == (w, h):
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self.fig.set_size_inches(w, h, forward=True)
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_log.info('figure size (inches) has been adjusted '
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'from %s x %s to %s x %s', wo, ho, w, h)
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else:
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w, h = self.fig.get_size_inches()
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_log.debug('frame size in pixels is %s x %s', *self.frame_size)
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return w, h
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def setup(self, fig, outfile, dpi=None):
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'''
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Perform setup for writing the movie file.
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Parameters
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----------
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fig : `~matplotlib.figure.Figure`
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The figure object that contains the information for frames
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outfile : str
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The filename of the resulting movie file
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dpi : int, optional
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The DPI (or resolution) for the file. This controls the size
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in pixels of the resulting movie file. Default is fig.dpi.
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'''
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self.outfile = outfile
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self.fig = fig
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if dpi is None:
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dpi = self.fig.dpi
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self.dpi = dpi
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self._w, self._h = self._adjust_frame_size()
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# Run here so that grab_frame() can write the data to a pipe. This
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# eliminates the need for temp files.
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self._run()
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def _run(self):
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# Uses subprocess to call the program for assembling frames into a
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# movie file. *args* returns the sequence of command line arguments
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# from a few configuration options.
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command = self._args()
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_log.info('MovieWriter.run: running command: %s', command)
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PIPE = subprocess.PIPE
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self._proc = subprocess.Popen(
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command, stdin=PIPE, stdout=PIPE, stderr=PIPE,
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creationflags=subprocess_creation_flags)
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def finish(self):
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'''Finish any processing for writing the movie.'''
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self.cleanup()
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def grab_frame(self, **savefig_kwargs):
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|
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'''
|
||
|
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Grab the image information from the figure and save as a movie frame.
|
||
|
|
|
||
|
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All keyword arguments in savefig_kwargs are passed on to the `savefig`
|
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command that saves the figure.
|
||
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'''
|
||
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_log.debug('MovieWriter.grab_frame: Grabbing frame.')
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||
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# re-adjust the figure size in case it has been changed by the
|
||
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# user. We must ensure that every frame is the same size or
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# the movie will not save correctly.
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||
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self.fig.set_size_inches(self._w, self._h)
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# Tell the figure to save its data to the sink, using the
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# frame format and dpi.
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self.fig.savefig(self._frame_sink(), format=self.frame_format,
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dpi=self.dpi, **savefig_kwargs)
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def _frame_sink(self):
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'''Return the place to which frames should be written.'''
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||
|
|
return self._proc.stdin
|
||
|
|
|
||
|
|
def _args(self):
|
||
|
|
'''Assemble list of utility-specific command-line arguments.'''
|
||
|
|
return NotImplementedError("args needs to be implemented by subclass.")
|
||
|
|
|
||
|
|
def cleanup(self):
|
||
|
|
'''Clean-up and collect the process used to write the movie file.'''
|
||
|
|
out, err = self._proc.communicate()
|
||
|
|
self._frame_sink().close()
|
||
|
|
# Use the encoding/errors that universal_newlines would use.
|
||
|
|
out = TextIOWrapper(BytesIO(out)).read()
|
||
|
|
err = TextIOWrapper(BytesIO(err)).read()
|
||
|
|
if out:
|
||
|
|
_log.log(
|
||
|
|
logging.WARNING if self._proc.returncode else logging.DEBUG,
|
||
|
|
"MovieWriter stdout:\n%s", out)
|
||
|
|
if err:
|
||
|
|
_log.log(
|
||
|
|
logging.WARNING if self._proc.returncode else logging.DEBUG,
|
||
|
|
"MovieWriter stderr:\n%s", err)
|
||
|
|
if self._proc.returncode:
|
||
|
|
raise subprocess.CalledProcessError(
|
||
|
|
self._proc.returncode, self._proc.args, out, err)
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def bin_path(cls):
|
||
|
|
'''
|
||
|
|
Return the binary path to the commandline tool used by a specific
|
||
|
|
subclass. This is a class method so that the tool can be looked for
|
||
|
|
before making a particular MovieWriter subclass available.
|
||
|
|
'''
|
||
|
|
return str(rcParams[cls.exec_key])
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def isAvailable(cls):
|
||
|
|
'''
|
||
|
|
Check to see if a MovieWriter subclass is actually available.
|
||
|
|
'''
|
||
|
|
return shutil.which(cls.bin_path()) is not None
|
||
|
|
|
||
|
|
|
||
|
|
class FileMovieWriter(MovieWriter):
|
||
|
|
'''`MovieWriter` for writing to individual files and stitching at the end.
|
||
|
|
|
||
|
|
This must be sub-classed to be useful.
|
||
|
|
'''
|
||
|
|
def __init__(self, *args, **kwargs):
|
||
|
|
MovieWriter.__init__(self, *args, **kwargs)
|
||
|
|
self.frame_format = rcParams['animation.frame_format']
|
||
|
|
|
||
|
|
def setup(self, fig, outfile, dpi=None, frame_prefix='_tmp',
|
||
|
|
clear_temp=True):
|
||
|
|
'''Perform setup for writing the movie file.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
fig : `~matplotlib.figure.Figure`
|
||
|
|
The figure to grab the rendered frames from.
|
||
|
|
outfile : str
|
||
|
|
The filename of the resulting movie file.
|
||
|
|
dpi : number, optional
|
||
|
|
The dpi of the output file. This, with the figure size,
|
||
|
|
controls the size in pixels of the resulting movie file.
|
||
|
|
Default is fig.dpi.
|
||
|
|
frame_prefix : str, optional
|
||
|
|
The filename prefix to use for temporary files. Defaults to
|
||
|
|
``'_tmp'``.
|
||
|
|
clear_temp : bool, optional
|
||
|
|
If the temporary files should be deleted after stitching
|
||
|
|
the final result. Setting this to ``False`` can be useful for
|
||
|
|
debugging. Defaults to ``True``.
|
||
|
|
|
||
|
|
'''
|
||
|
|
self.fig = fig
|
||
|
|
self.outfile = outfile
|
||
|
|
if dpi is None:
|
||
|
|
dpi = self.fig.dpi
|
||
|
|
self.dpi = dpi
|
||
|
|
self._adjust_frame_size()
|
||
|
|
|
||
|
|
self.clear_temp = clear_temp
|
||
|
|
self.temp_prefix = frame_prefix
|
||
|
|
self._frame_counter = 0 # used for generating sequential file names
|
||
|
|
self._temp_names = list()
|
||
|
|
self.fname_format_str = '%s%%07d.%s'
|
||
|
|
|
||
|
|
@property
|
||
|
|
def frame_format(self):
|
||
|
|
'''
|
||
|
|
Format (png, jpeg, etc.) to use for saving the frames, which can be
|
||
|
|
decided by the individual subclasses.
|
||
|
|
'''
|
||
|
|
return self._frame_format
|
||
|
|
|
||
|
|
@frame_format.setter
|
||
|
|
def frame_format(self, frame_format):
|
||
|
|
if frame_format in self.supported_formats:
|
||
|
|
self._frame_format = frame_format
|
||
|
|
else:
|
||
|
|
self._frame_format = self.supported_formats[0]
|
||
|
|
|
||
|
|
def _base_temp_name(self):
|
||
|
|
# Generates a template name (without number) given the frame format
|
||
|
|
# for extension and the prefix.
|
||
|
|
return self.fname_format_str % (self.temp_prefix, self.frame_format)
|
||
|
|
|
||
|
|
def _frame_sink(self):
|
||
|
|
# Creates a filename for saving using the basename and the current
|
||
|
|
# counter.
|
||
|
|
fname = self._base_temp_name() % self._frame_counter
|
||
|
|
|
||
|
|
# Save the filename so we can delete it later if necessary
|
||
|
|
self._temp_names.append(fname)
|
||
|
|
_log.debug('FileMovieWriter.frame_sink: saving frame %d to fname=%s',
|
||
|
|
self._frame_counter, fname)
|
||
|
|
self._frame_counter += 1 # Ensures each created name is 'unique'
|
||
|
|
|
||
|
|
# This file returned here will be closed once it's used by savefig()
|
||
|
|
# because it will no longer be referenced and will be gc-ed.
|
||
|
|
return open(fname, 'wb')
|
||
|
|
|
||
|
|
def grab_frame(self, **savefig_kwargs):
|
||
|
|
'''
|
||
|
|
Grab the image information from the figure and save as a movie frame.
|
||
|
|
All keyword arguments in savefig_kwargs are passed on to the `savefig`
|
||
|
|
command that saves the figure.
|
||
|
|
'''
|
||
|
|
# Overloaded to explicitly close temp file.
|
||
|
|
_log.debug('MovieWriter.grab_frame: Grabbing frame.')
|
||
|
|
# Tell the figure to save its data to the sink, using the
|
||
|
|
# frame format and dpi.
|
||
|
|
with self._frame_sink() as myframesink:
|
||
|
|
self.fig.savefig(myframesink, format=self.frame_format,
|
||
|
|
dpi=self.dpi, **savefig_kwargs)
|
||
|
|
|
||
|
|
def finish(self):
|
||
|
|
# Call run here now that all frame grabbing is done. All temp files
|
||
|
|
# are available to be assembled.
|
||
|
|
self._run()
|
||
|
|
MovieWriter.finish(self) # Will call clean-up
|
||
|
|
|
||
|
|
def cleanup(self):
|
||
|
|
MovieWriter.cleanup(self)
|
||
|
|
|
||
|
|
# Delete temporary files
|
||
|
|
if self.clear_temp:
|
||
|
|
_log.debug('MovieWriter: clearing temporary fnames=%s',
|
||
|
|
self._temp_names)
|
||
|
|
for fname in self._temp_names:
|
||
|
|
os.remove(fname)
|
||
|
|
|
||
|
|
|
||
|
|
@writers.register('pillow')
|
||
|
|
class PillowWriter(MovieWriter):
|
||
|
|
@classmethod
|
||
|
|
def isAvailable(cls):
|
||
|
|
try:
|
||
|
|
import PIL
|
||
|
|
except ImportError:
|
||
|
|
return False
|
||
|
|
return True
|
||
|
|
|
||
|
|
def __init__(self, *args, **kwargs):
|
||
|
|
if kwargs.get("extra_args") is None:
|
||
|
|
kwargs["extra_args"] = ()
|
||
|
|
super().__init__(*args, **kwargs)
|
||
|
|
|
||
|
|
def setup(self, fig, outfile, dpi=None):
|
||
|
|
self._frames = []
|
||
|
|
self._outfile = outfile
|
||
|
|
self._dpi = dpi
|
||
|
|
self._fig = fig
|
||
|
|
|
||
|
|
def grab_frame(self, **savefig_kwargs):
|
||
|
|
from PIL import Image
|
||
|
|
buf = BytesIO()
|
||
|
|
self._fig.savefig(buf, **dict(savefig_kwargs, format="rgba"))
|
||
|
|
renderer = self._fig.canvas.get_renderer()
|
||
|
|
# Using frombuffer / getbuffer may be slightly more efficient, but
|
||
|
|
# Py3-only.
|
||
|
|
self._frames.append(Image.frombytes(
|
||
|
|
"RGBA",
|
||
|
|
(int(renderer.width), int(renderer.height)),
|
||
|
|
buf.getvalue()))
|
||
|
|
|
||
|
|
def finish(self):
|
||
|
|
self._frames[0].save(
|
||
|
|
self._outfile, save_all=True, append_images=self._frames[1:],
|
||
|
|
duration=int(1000 / self.fps), loop=0)
|
||
|
|
|
||
|
|
|
||
|
|
# Base class of ffmpeg information. Has the config keys and the common set
|
||
|
|
# of arguments that controls the *output* side of things.
|
||
|
|
class FFMpegBase(object):
|
||
|
|
'''Mixin class for FFMpeg output.
|
||
|
|
|
||
|
|
To be useful this must be multiply-inherited from with a
|
||
|
|
`MovieWriterBase` sub-class.
|
||
|
|
'''
|
||
|
|
|
||
|
|
exec_key = 'animation.ffmpeg_path'
|
||
|
|
args_key = 'animation.ffmpeg_args'
|
||
|
|
|
||
|
|
@property
|
||
|
|
def output_args(self):
|
||
|
|
args = ['-vcodec', self.codec]
|
||
|
|
# For h264, the default format is yuv444p, which is not compatible
|
||
|
|
# with quicktime (and others). Specifying yuv420p fixes playback on
|
||
|
|
# iOS,as well as HTML5 video in firefox and safari (on both Win and
|
||
|
|
# OSX). Also fixes internet explorer. This is as of 2015/10/29.
|
||
|
|
if self.codec == 'h264' and '-pix_fmt' not in self.extra_args:
|
||
|
|
args.extend(['-pix_fmt', 'yuv420p'])
|
||
|
|
# The %dk adds 'k' as a suffix so that ffmpeg treats our bitrate as in
|
||
|
|
# kbps
|
||
|
|
if self.bitrate > 0:
|
||
|
|
args.extend(['-b', '%dk' % self.bitrate])
|
||
|
|
if self.extra_args:
|
||
|
|
args.extend(self.extra_args)
|
||
|
|
for k, v in self.metadata.items():
|
||
|
|
args.extend(['-metadata', '%s=%s' % (k, v)])
|
||
|
|
|
||
|
|
return args + ['-y', self.outfile]
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def isAvailable(cls):
|
||
|
|
return (
|
||
|
|
super().isAvailable()
|
||
|
|
# Ubuntu 12.04 ships a broken ffmpeg binary which we shouldn't use.
|
||
|
|
# NOTE: when removed, remove the same method in AVConvBase.
|
||
|
|
and b'LibAv' not in subprocess.run(
|
||
|
|
[cls.bin_path()], creationflags=subprocess_creation_flags,
|
||
|
|
stdout=subprocess.DEVNULL, stderr=subprocess.PIPE).stderr)
|
||
|
|
|
||
|
|
|
||
|
|
# Combine FFMpeg options with pipe-based writing
|
||
|
|
@writers.register('ffmpeg')
|
||
|
|
class FFMpegWriter(FFMpegBase, MovieWriter):
|
||
|
|
'''Pipe-based ffmpeg writer.
|
||
|
|
|
||
|
|
Frames are streamed directly to ffmpeg via a pipe and written in a single
|
||
|
|
pass.
|
||
|
|
'''
|
||
|
|
def _args(self):
|
||
|
|
# Returns the command line parameters for subprocess to use
|
||
|
|
# ffmpeg to create a movie using a pipe.
|
||
|
|
args = [self.bin_path(), '-f', 'rawvideo', '-vcodec', 'rawvideo',
|
||
|
|
'-s', '%dx%d' % self.frame_size, '-pix_fmt', self.frame_format,
|
||
|
|
'-r', str(self.fps)]
|
||
|
|
# Logging is quieted because subprocess.PIPE has limited buffer size.
|
||
|
|
# If you have a lot of frames in your animation and set logging to
|
||
|
|
# DEBUG, you will have a buffer overrun.
|
||
|
|
if _log.getEffectiveLevel() > logging.DEBUG:
|
||
|
|
args += ['-loglevel', 'error']
|
||
|
|
args += ['-i', 'pipe:'] + self.output_args
|
||
|
|
return args
|
||
|
|
|
||
|
|
|
||
|
|
# Combine FFMpeg options with temp file-based writing
|
||
|
|
@writers.register('ffmpeg_file')
|
||
|
|
class FFMpegFileWriter(FFMpegBase, FileMovieWriter):
|
||
|
|
'''File-based ffmpeg writer.
|
||
|
|
|
||
|
|
Frames are written to temporary files on disk and then stitched
|
||
|
|
together at the end.
|
||
|
|
|
||
|
|
'''
|
||
|
|
supported_formats = ['png', 'jpeg', 'ppm', 'tiff', 'sgi', 'bmp',
|
||
|
|
'pbm', 'raw', 'rgba']
|
||
|
|
|
||
|
|
def _args(self):
|
||
|
|
# Returns the command line parameters for subprocess to use
|
||
|
|
# ffmpeg to create a movie using a collection of temp images
|
||
|
|
return [self.bin_path(), '-r', str(self.fps),
|
||
|
|
'-i', self._base_temp_name(),
|
||
|
|
'-vframes', str(self._frame_counter)] + self.output_args
|
||
|
|
|
||
|
|
|
||
|
|
# Base class of avconv information. AVConv has identical arguments to FFMpeg.
|
||
|
|
class AVConvBase(FFMpegBase):
|
||
|
|
'''Mixin class for avconv output.
|
||
|
|
|
||
|
|
To be useful this must be multiply-inherited from with a
|
||
|
|
`MovieWriterBase` sub-class.
|
||
|
|
'''
|
||
|
|
|
||
|
|
exec_key = 'animation.avconv_path'
|
||
|
|
args_key = 'animation.avconv_args'
|
||
|
|
|
||
|
|
# NOTE : should be removed when the same method is removed in FFMpegBase.
|
||
|
|
isAvailable = classmethod(MovieWriter.isAvailable.__func__)
|
||
|
|
|
||
|
|
|
||
|
|
# Combine AVConv options with pipe-based writing
|
||
|
|
@writers.register('avconv')
|
||
|
|
class AVConvWriter(AVConvBase, FFMpegWriter):
|
||
|
|
'''Pipe-based avconv writer.
|
||
|
|
|
||
|
|
Frames are streamed directly to avconv via a pipe and written in a single
|
||
|
|
pass.
|
||
|
|
'''
|
||
|
|
|
||
|
|
|
||
|
|
# Combine AVConv options with file-based writing
|
||
|
|
@writers.register('avconv_file')
|
||
|
|
class AVConvFileWriter(AVConvBase, FFMpegFileWriter):
|
||
|
|
'''File-based avconv writer.
|
||
|
|
|
||
|
|
Frames are written to temporary files on disk and then stitched
|
||
|
|
together at the end.
|
||
|
|
'''
|
||
|
|
|
||
|
|
|
||
|
|
# Base class for animated GIFs with ImageMagick
|
||
|
|
class ImageMagickBase(object):
|
||
|
|
'''Mixin class for ImageMagick output.
|
||
|
|
|
||
|
|
To be useful this must be multiply-inherited from with a
|
||
|
|
`MovieWriterBase` sub-class.
|
||
|
|
'''
|
||
|
|
|
||
|
|
exec_key = 'animation.convert_path'
|
||
|
|
args_key = 'animation.convert_args'
|
||
|
|
|
||
|
|
@property
|
||
|
|
def delay(self):
|
||
|
|
return 100. / self.fps
|
||
|
|
|
||
|
|
@property
|
||
|
|
def output_args(self):
|
||
|
|
return [self.outfile]
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def bin_path(cls):
|
||
|
|
binpath = super().bin_path()
|
||
|
|
if binpath == 'convert':
|
||
|
|
binpath = mpl._get_executable_info('magick').executable
|
||
|
|
return binpath
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def isAvailable(cls):
|
||
|
|
try:
|
||
|
|
return super().isAvailable()
|
||
|
|
except FileNotFoundError: # May be raised by get_executable_info.
|
||
|
|
return False
|
||
|
|
|
||
|
|
|
||
|
|
# Combine ImageMagick options with pipe-based writing
|
||
|
|
@writers.register('imagemagick')
|
||
|
|
class ImageMagickWriter(ImageMagickBase, MovieWriter):
|
||
|
|
'''Pipe-based animated gif.
|
||
|
|
|
||
|
|
Frames are streamed directly to ImageMagick via a pipe and written
|
||
|
|
in a single pass.
|
||
|
|
|
||
|
|
'''
|
||
|
|
def _args(self):
|
||
|
|
return ([self.bin_path(),
|
||
|
|
'-size', '%ix%i' % self.frame_size, '-depth', '8',
|
||
|
|
'-delay', str(self.delay), '-loop', '0',
|
||
|
|
'%s:-' % self.frame_format]
|
||
|
|
+ self.output_args)
|
||
|
|
|
||
|
|
|
||
|
|
# Combine ImageMagick options with temp file-based writing
|
||
|
|
@writers.register('imagemagick_file')
|
||
|
|
class ImageMagickFileWriter(ImageMagickBase, FileMovieWriter):
|
||
|
|
'''File-based animated gif writer.
|
||
|
|
|
||
|
|
Frames are written to temporary files on disk and then stitched
|
||
|
|
together at the end.
|
||
|
|
|
||
|
|
'''
|
||
|
|
|
||
|
|
supported_formats = ['png', 'jpeg', 'ppm', 'tiff', 'sgi', 'bmp',
|
||
|
|
'pbm', 'raw', 'rgba']
|
||
|
|
|
||
|
|
def _args(self):
|
||
|
|
return ([self.bin_path(), '-delay', str(self.delay), '-loop', '0',
|
||
|
|
'%s*.%s' % (self.temp_prefix, self.frame_format)]
|
||
|
|
+ self.output_args)
|
||
|
|
|
||
|
|
|
||
|
|
# Taken directly from jakevdp's JSAnimation package at
|
||
|
|
# http://github.com/jakevdp/JSAnimation
|
||
|
|
def _included_frames(frame_list, frame_format):
|
||
|
|
"""frame_list should be a list of filenames"""
|
||
|
|
return INCLUDED_FRAMES.format(Nframes=len(frame_list),
|
||
|
|
frame_dir=os.path.dirname(frame_list[0]),
|
||
|
|
frame_format=frame_format)
|
||
|
|
|
||
|
|
|
||
|
|
def _embedded_frames(frame_list, frame_format):
|
||
|
|
"""frame_list should be a list of base64-encoded png files"""
|
||
|
|
template = ' frames[{0}] = "data:image/{1};base64,{2}"\n'
|
||
|
|
return "\n" + "".join(
|
||
|
|
template.format(i, frame_format, frame_data.replace('\n', '\\\n'))
|
||
|
|
for i, frame_data in enumerate(frame_list))
|
||
|
|
|
||
|
|
|
||
|
|
@writers.register('html')
|
||
|
|
class HTMLWriter(FileMovieWriter):
|
||
|
|
supported_formats = ['png', 'jpeg', 'tiff', 'svg']
|
||
|
|
args_key = 'animation.html_args'
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def isAvailable(cls):
|
||
|
|
return True
|
||
|
|
|
||
|
|
def __init__(self, fps=30, codec=None, bitrate=None, extra_args=None,
|
||
|
|
metadata=None, embed_frames=False, default_mode='loop',
|
||
|
|
embed_limit=None):
|
||
|
|
self.embed_frames = embed_frames
|
||
|
|
self.default_mode = default_mode.lower()
|
||
|
|
|
||
|
|
# Save embed limit, which is given in MB
|
||
|
|
if embed_limit is None:
|
||
|
|
self._bytes_limit = rcParams['animation.embed_limit']
|
||
|
|
else:
|
||
|
|
self._bytes_limit = embed_limit
|
||
|
|
|
||
|
|
# Convert from MB to bytes
|
||
|
|
self._bytes_limit *= 1024 * 1024
|
||
|
|
|
||
|
|
if self.default_mode not in ['loop', 'once', 'reflect']:
|
||
|
|
raise ValueError(
|
||
|
|
"unrecognized default_mode {!r}".format(self.default_mode))
|
||
|
|
|
||
|
|
super().__init__(fps, codec, bitrate, extra_args, metadata)
|
||
|
|
|
||
|
|
def setup(self, fig, outfile, dpi, frame_dir=None):
|
||
|
|
root, ext = os.path.splitext(outfile)
|
||
|
|
if ext not in ['.html', '.htm']:
|
||
|
|
raise ValueError("outfile must be *.htm or *.html")
|
||
|
|
|
||
|
|
self._saved_frames = []
|
||
|
|
self._total_bytes = 0
|
||
|
|
self._hit_limit = False
|
||
|
|
|
||
|
|
if not self.embed_frames:
|
||
|
|
if frame_dir is None:
|
||
|
|
frame_dir = root + '_frames'
|
||
|
|
if not os.path.exists(frame_dir):
|
||
|
|
os.makedirs(frame_dir)
|
||
|
|
frame_prefix = os.path.join(frame_dir, 'frame')
|
||
|
|
else:
|
||
|
|
frame_prefix = None
|
||
|
|
|
||
|
|
super().setup(fig, outfile, dpi, frame_prefix, clear_temp=False)
|
||
|
|
|
||
|
|
def grab_frame(self, **savefig_kwargs):
|
||
|
|
if self.embed_frames:
|
||
|
|
# Just stop processing if we hit the limit
|
||
|
|
if self._hit_limit:
|
||
|
|
return
|
||
|
|
f = BytesIO()
|
||
|
|
self.fig.savefig(f, format=self.frame_format,
|
||
|
|
dpi=self.dpi, **savefig_kwargs)
|
||
|
|
imgdata64 = base64.encodebytes(f.getvalue()).decode('ascii')
|
||
|
|
self._total_bytes += len(imgdata64)
|
||
|
|
if self._total_bytes >= self._bytes_limit:
|
||
|
|
_log.warning(
|
||
|
|
"Animation size has reached %s bytes, exceeding the limit "
|
||
|
|
"of %s. If you're sure you want a larger animation "
|
||
|
|
"embedded, set the animation.embed_limit rc parameter to "
|
||
|
|
"a larger value (in MB). This and further frames will be "
|
||
|
|
"dropped.", self._total_bytes, self._bytes_limit)
|
||
|
|
self._hit_limit = True
|
||
|
|
else:
|
||
|
|
self._saved_frames.append(imgdata64)
|
||
|
|
else:
|
||
|
|
return super().grab_frame(**savefig_kwargs)
|
||
|
|
|
||
|
|
def finish(self):
|
||
|
|
# save the frames to an html file
|
||
|
|
if self.embed_frames:
|
||
|
|
fill_frames = _embedded_frames(self._saved_frames,
|
||
|
|
self.frame_format)
|
||
|
|
Nframes = len(self._saved_frames)
|
||
|
|
else:
|
||
|
|
# temp names is filled by FileMovieWriter
|
||
|
|
fill_frames = _included_frames(self._temp_names,
|
||
|
|
self.frame_format)
|
||
|
|
Nframes = len(self._temp_names)
|
||
|
|
mode_dict = dict(once_checked='',
|
||
|
|
loop_checked='',
|
||
|
|
reflect_checked='')
|
||
|
|
mode_dict[self.default_mode + '_checked'] = 'checked'
|
||
|
|
|
||
|
|
interval = 1000 // self.fps
|
||
|
|
|
||
|
|
with open(self.outfile, 'w') as of:
|
||
|
|
of.write(JS_INCLUDE + STYLE_INCLUDE)
|
||
|
|
of.write(DISPLAY_TEMPLATE.format(id=uuid.uuid4().hex,
|
||
|
|
Nframes=Nframes,
|
||
|
|
fill_frames=fill_frames,
|
||
|
|
interval=interval,
|
||
|
|
**mode_dict))
|
||
|
|
|
||
|
|
|
||
|
|
class Animation(object):
|
||
|
|
'''This class wraps the creation of an animation using matplotlib.
|
||
|
|
|
||
|
|
It is only a base class which should be subclassed to provide
|
||
|
|
needed behavior.
|
||
|
|
|
||
|
|
This class is not typically used directly.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
fig : `~matplotlib.figure.Figure`
|
||
|
|
The figure object that is used to get draw, resize, and any
|
||
|
|
other needed events.
|
||
|
|
|
||
|
|
event_source : object, optional
|
||
|
|
A class that can run a callback when desired events
|
||
|
|
are generated, as well as be stopped and started.
|
||
|
|
|
||
|
|
Examples include timers (see :class:`TimedAnimation`) and file
|
||
|
|
system notifications.
|
||
|
|
|
||
|
|
blit : bool, optional
|
||
|
|
controls whether blitting is used to optimize drawing. Defaults
|
||
|
|
to ``False``.
|
||
|
|
|
||
|
|
See Also
|
||
|
|
--------
|
||
|
|
FuncAnimation, ArtistAnimation
|
||
|
|
|
||
|
|
'''
|
||
|
|
def __init__(self, fig, event_source=None, blit=False):
|
||
|
|
self._fig = fig
|
||
|
|
# Disables blitting for backends that don't support it. This
|
||
|
|
# allows users to request it if available, but still have a
|
||
|
|
# fallback that works if it is not.
|
||
|
|
self._blit = blit and fig.canvas.supports_blit
|
||
|
|
|
||
|
|
# These are the basics of the animation. The frame sequence represents
|
||
|
|
# information for each frame of the animation and depends on how the
|
||
|
|
# drawing is handled by the subclasses. The event source fires events
|
||
|
|
# that cause the frame sequence to be iterated.
|
||
|
|
self.frame_seq = self.new_frame_seq()
|
||
|
|
self.event_source = event_source
|
||
|
|
|
||
|
|
# Instead of starting the event source now, we connect to the figure's
|
||
|
|
# draw_event, so that we only start once the figure has been drawn.
|
||
|
|
self._first_draw_id = fig.canvas.mpl_connect('draw_event', self._start)
|
||
|
|
|
||
|
|
# Connect to the figure's close_event so that we don't continue to
|
||
|
|
# fire events and try to draw to a deleted figure.
|
||
|
|
self._close_id = self._fig.canvas.mpl_connect('close_event',
|
||
|
|
self._stop)
|
||
|
|
if self._blit:
|
||
|
|
self._setup_blit()
|
||
|
|
|
||
|
|
def _start(self, *args):
|
||
|
|
'''
|
||
|
|
Starts interactive animation. Adds the draw frame command to the GUI
|
||
|
|
handler, calls show to start the event loop.
|
||
|
|
'''
|
||
|
|
# First disconnect our draw event handler
|
||
|
|
self._fig.canvas.mpl_disconnect(self._first_draw_id)
|
||
|
|
self._first_draw_id = None # So we can check on save
|
||
|
|
|
||
|
|
# Now do any initial draw
|
||
|
|
self._init_draw()
|
||
|
|
|
||
|
|
# Add our callback for stepping the animation and
|
||
|
|
# actually start the event_source.
|
||
|
|
self.event_source.add_callback(self._step)
|
||
|
|
self.event_source.start()
|
||
|
|
|
||
|
|
def _stop(self, *args):
|
||
|
|
# On stop we disconnect all of our events.
|
||
|
|
if self._blit:
|
||
|
|
self._fig.canvas.mpl_disconnect(self._resize_id)
|
||
|
|
self._fig.canvas.mpl_disconnect(self._close_id)
|
||
|
|
self.event_source.remove_callback(self._step)
|
||
|
|
self.event_source = None
|
||
|
|
|
||
|
|
def save(self, filename, writer=None, fps=None, dpi=None, codec=None,
|
||
|
|
bitrate=None, extra_args=None, metadata=None, extra_anim=None,
|
||
|
|
savefig_kwargs=None, *, progress_callback=None):
|
||
|
|
"""
|
||
|
|
Save the animation as a movie file by drawing every frame.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
|
||
|
|
filename : str
|
||
|
|
The output filename, e.g., :file:`mymovie.mp4`.
|
||
|
|
|
||
|
|
writer : :class:`MovieWriter` or str, optional
|
||
|
|
A `MovieWriter` instance to use or a key that identifies a
|
||
|
|
class to use, such as 'ffmpeg'. If ``None``, defaults to
|
||
|
|
:rc:`animation.writer` = 'ffmpeg'.
|
||
|
|
|
||
|
|
fps : number, optional
|
||
|
|
Frames per second in the movie. Defaults to ``None``, which will use
|
||
|
|
the animation's specified interval to set the frames per second.
|
||
|
|
|
||
|
|
dpi : number, optional
|
||
|
|
Controls the dots per inch for the movie frames. This combined with
|
||
|
|
the figure's size in inches controls the size of the movie. If
|
||
|
|
``None``, defaults to :rc:`savefig.dpi`.
|
||
|
|
|
||
|
|
codec : str, optional
|
||
|
|
The video codec to be used. Not all codecs are supported
|
||
|
|
by a given :class:`MovieWriter`. If ``None``, default to
|
||
|
|
:rc:`animation.codec` = 'h264'.
|
||
|
|
|
||
|
|
bitrate : number, optional
|
||
|
|
Specifies the number of bits used per second in the compressed
|
||
|
|
movie, in kilobits per second. A higher number means a higher
|
||
|
|
quality movie, but at the cost of increased file size. If ``None``,
|
||
|
|
defaults to :rc:`animation.bitrate` = -1.
|
||
|
|
|
||
|
|
extra_args : list, optional
|
||
|
|
List of extra string arguments to be passed to the underlying movie
|
||
|
|
utility. If ``None``, defaults to :rc:`animation.extra_args`.
|
||
|
|
|
||
|
|
metadata : Dict[str, str], optional
|
||
|
|
Dictionary of keys and values for metadata to include in
|
||
|
|
the output file. Some keys that may be of use include:
|
||
|
|
title, artist, genre, subject, copyright, srcform, comment.
|
||
|
|
|
||
|
|
extra_anim : list, optional
|
||
|
|
Additional `Animation` objects that should be included
|
||
|
|
in the saved movie file. These need to be from the same
|
||
|
|
`matplotlib.figure.Figure` instance. Also, animation frames will
|
||
|
|
just be simply combined, so there should be a 1:1 correspondence
|
||
|
|
between the frames from the different animations.
|
||
|
|
|
||
|
|
savefig_kwargs : dict, optional
|
||
|
|
Is a dictionary containing keyword arguments to be passed
|
||
|
|
on to the `savefig` command which is called repeatedly to
|
||
|
|
save the individual frames.
|
||
|
|
|
||
|
|
progress_callback : function, optional
|
||
|
|
A callback function that will be called for every frame to notify
|
||
|
|
the saving progress. It must have the signature ::
|
||
|
|
|
||
|
|
def func(current_frame: int, total_frames: int) -> Any
|
||
|
|
|
||
|
|
where *current_frame* is the current frame number and
|
||
|
|
*total_frames* is the total number of frames to be saved.
|
||
|
|
*total_frames* is set to None, if the total number of frames can
|
||
|
|
not be determined. Return values may exist but are ignored.
|
||
|
|
|
||
|
|
Example code to write the progress to stdout::
|
||
|
|
|
||
|
|
progress_callback =\
|
||
|
|
lambda i, n: print(f'Saving frame {i} of {n}')
|
||
|
|
|
||
|
|
Notes
|
||
|
|
-----
|
||
|
|
*fps*, *codec*, *bitrate*, *extra_args* and *metadata* are used to
|
||
|
|
construct a `.MovieWriter` instance and can only be passed if
|
||
|
|
*writer* is a string. If they are passed as non-*None* and *writer*
|
||
|
|
is a `.MovieWriter`, a `RuntimeError` will be raised.
|
||
|
|
|
||
|
|
"""
|
||
|
|
# If the writer is None, use the rc param to find the name of the one
|
||
|
|
# to use
|
||
|
|
if writer is None:
|
||
|
|
writer = rcParams['animation.writer']
|
||
|
|
elif (not isinstance(writer, str) and
|
||
|
|
any(arg is not None
|
||
|
|
for arg in (fps, codec, bitrate, extra_args, metadata))):
|
||
|
|
raise RuntimeError('Passing in values for arguments '
|
||
|
|
'fps, codec, bitrate, extra_args, or metadata '
|
||
|
|
'is not supported when writer is an existing '
|
||
|
|
'MovieWriter instance. These should instead be '
|
||
|
|
'passed as arguments when creating the '
|
||
|
|
'MovieWriter instance.')
|
||
|
|
|
||
|
|
if savefig_kwargs is None:
|
||
|
|
savefig_kwargs = {}
|
||
|
|
|
||
|
|
# Need to disconnect the first draw callback, since we'll be doing
|
||
|
|
# draws. Otherwise, we'll end up starting the animation.
|
||
|
|
if self._first_draw_id is not None:
|
||
|
|
self._fig.canvas.mpl_disconnect(self._first_draw_id)
|
||
|
|
reconnect_first_draw = True
|
||
|
|
else:
|
||
|
|
reconnect_first_draw = False
|
||
|
|
|
||
|
|
if fps is None and hasattr(self, '_interval'):
|
||
|
|
# Convert interval in ms to frames per second
|
||
|
|
fps = 1000. / self._interval
|
||
|
|
|
||
|
|
# Re-use the savefig DPI for ours if none is given
|
||
|
|
if dpi is None:
|
||
|
|
dpi = rcParams['savefig.dpi']
|
||
|
|
if dpi == 'figure':
|
||
|
|
dpi = self._fig.dpi
|
||
|
|
|
||
|
|
if codec is None:
|
||
|
|
codec = rcParams['animation.codec']
|
||
|
|
|
||
|
|
if bitrate is None:
|
||
|
|
bitrate = rcParams['animation.bitrate']
|
||
|
|
|
||
|
|
all_anim = [self]
|
||
|
|
if extra_anim is not None:
|
||
|
|
all_anim.extend(anim
|
||
|
|
for anim
|
||
|
|
in extra_anim if anim._fig is self._fig)
|
||
|
|
|
||
|
|
# If we have the name of a writer, instantiate an instance of the
|
||
|
|
# registered class.
|
||
|
|
if isinstance(writer, str):
|
||
|
|
if writer in writers.avail:
|
||
|
|
writer = writers[writer](fps, codec, bitrate,
|
||
|
|
extra_args=extra_args,
|
||
|
|
metadata=metadata)
|
||
|
|
else:
|
||
|
|
if writers.list():
|
||
|
|
alt_writer = writers[writers.list()[0]]
|
||
|
|
_log.warning("MovieWriter %s unavailable; trying to use "
|
||
|
|
"%s instead.", writer, alt_writer)
|
||
|
|
writer = alt_writer(
|
||
|
|
fps, codec, bitrate,
|
||
|
|
extra_args=extra_args, metadata=metadata)
|
||
|
|
else:
|
||
|
|
raise ValueError("Cannot save animation: no writers are "
|
||
|
|
"available. Please install ffmpeg to "
|
||
|
|
"save animations.")
|
||
|
|
_log.info('Animation.save using %s', type(writer))
|
||
|
|
|
||
|
|
if 'bbox_inches' in savefig_kwargs:
|
||
|
|
_log.warning("Warning: discarding the 'bbox_inches' argument in "
|
||
|
|
"'savefig_kwargs' as it may cause frame size "
|
||
|
|
"to vary, which is inappropriate for animation.")
|
||
|
|
savefig_kwargs.pop('bbox_inches')
|
||
|
|
|
||
|
|
# Create a new sequence of frames for saved data. This is different
|
||
|
|
# from new_frame_seq() to give the ability to save 'live' generated
|
||
|
|
# frame information to be saved later.
|
||
|
|
# TODO: Right now, after closing the figure, saving a movie won't work
|
||
|
|
# since GUI widgets are gone. Either need to remove extra code to
|
||
|
|
# allow for this non-existent use case or find a way to make it work.
|
||
|
|
with rc_context():
|
||
|
|
if rcParams['savefig.bbox'] == 'tight':
|
||
|
|
_log.info("Disabling savefig.bbox = 'tight', as it may cause "
|
||
|
|
"frame size to vary, which is inappropriate for "
|
||
|
|
"animation.")
|
||
|
|
rcParams['savefig.bbox'] = None
|
||
|
|
with writer.saving(self._fig, filename, dpi):
|
||
|
|
for anim in all_anim:
|
||
|
|
# Clear the initial frame
|
||
|
|
anim._init_draw()
|
||
|
|
frame_number = 0
|
||
|
|
# TODO: Currently only FuncAnimation has a save_count
|
||
|
|
# attribute. Can we generalize this to all Animations?
|
||
|
|
save_count_list = [getattr(a, 'save_count', None)
|
||
|
|
for a in all_anim]
|
||
|
|
if None in save_count_list:
|
||
|
|
total_frames = None
|
||
|
|
else:
|
||
|
|
total_frames = sum(save_count_list)
|
||
|
|
for data in zip(*[a.new_saved_frame_seq() for a in all_anim]):
|
||
|
|
for anim, d in zip(all_anim, data):
|
||
|
|
# TODO: See if turning off blit is really necessary
|
||
|
|
anim._draw_next_frame(d, blit=False)
|
||
|
|
if progress_callback is not None:
|
||
|
|
progress_callback(frame_number, total_frames)
|
||
|
|
frame_number += 1
|
||
|
|
writer.grab_frame(**savefig_kwargs)
|
||
|
|
|
||
|
|
# Reconnect signal for first draw if necessary
|
||
|
|
if reconnect_first_draw:
|
||
|
|
self._first_draw_id = self._fig.canvas.mpl_connect('draw_event',
|
||
|
|
self._start)
|
||
|
|
|
||
|
|
def _step(self, *args):
|
||
|
|
'''
|
||
|
|
Handler for getting events. By default, gets the next frame in the
|
||
|
|
sequence and hands the data off to be drawn.
|
||
|
|
'''
|
||
|
|
# Returns True to indicate that the event source should continue to
|
||
|
|
# call _step, until the frame sequence reaches the end of iteration,
|
||
|
|
# at which point False will be returned.
|
||
|
|
try:
|
||
|
|
framedata = next(self.frame_seq)
|
||
|
|
self._draw_next_frame(framedata, self._blit)
|
||
|
|
return True
|
||
|
|
except StopIteration:
|
||
|
|
return False
|
||
|
|
|
||
|
|
def new_frame_seq(self):
|
||
|
|
"""Return a new sequence of frame information."""
|
||
|
|
# Default implementation is just an iterator over self._framedata
|
||
|
|
return iter(self._framedata)
|
||
|
|
|
||
|
|
def new_saved_frame_seq(self):
|
||
|
|
"""Return a new sequence of saved/cached frame information."""
|
||
|
|
# Default is the same as the regular frame sequence
|
||
|
|
return self.new_frame_seq()
|
||
|
|
|
||
|
|
def _draw_next_frame(self, framedata, blit):
|
||
|
|
# Breaks down the drawing of the next frame into steps of pre- and
|
||
|
|
# post- draw, as well as the drawing of the frame itself.
|
||
|
|
self._pre_draw(framedata, blit)
|
||
|
|
self._draw_frame(framedata)
|
||
|
|
self._post_draw(framedata, blit)
|
||
|
|
|
||
|
|
def _init_draw(self):
|
||
|
|
# Initial draw to clear the frame. Also used by the blitting code
|
||
|
|
# when a clean base is required.
|
||
|
|
pass
|
||
|
|
|
||
|
|
def _pre_draw(self, framedata, blit):
|
||
|
|
# Perform any cleaning or whatnot before the drawing of the frame.
|
||
|
|
# This default implementation allows blit to clear the frame.
|
||
|
|
if blit:
|
||
|
|
self._blit_clear(self._drawn_artists, self._blit_cache)
|
||
|
|
|
||
|
|
def _draw_frame(self, framedata):
|
||
|
|
# Performs actual drawing of the frame.
|
||
|
|
raise NotImplementedError('Needs to be implemented by subclasses to'
|
||
|
|
' actually make an animation.')
|
||
|
|
|
||
|
|
def _post_draw(self, framedata, blit):
|
||
|
|
# After the frame is rendered, this handles the actual flushing of
|
||
|
|
# the draw, which can be a direct draw_idle() or make use of the
|
||
|
|
# blitting.
|
||
|
|
if blit and self._drawn_artists:
|
||
|
|
self._blit_draw(self._drawn_artists, self._blit_cache)
|
||
|
|
else:
|
||
|
|
self._fig.canvas.draw_idle()
|
||
|
|
|
||
|
|
# The rest of the code in this class is to facilitate easy blitting
|
||
|
|
def _blit_draw(self, artists, bg_cache):
|
||
|
|
# Handles blitted drawing, which renders only the artists given instead
|
||
|
|
# of the entire figure.
|
||
|
|
updated_ax = []
|
||
|
|
for a in artists:
|
||
|
|
# If we haven't cached the background for this axes object, do
|
||
|
|
# so now. This might not always be reliable, but it's an attempt
|
||
|
|
# to automate the process.
|
||
|
|
if a.axes not in bg_cache:
|
||
|
|
bg_cache[a.axes] = a.figure.canvas.copy_from_bbox(a.axes.bbox)
|
||
|
|
a.axes.draw_artist(a)
|
||
|
|
updated_ax.append(a.axes)
|
||
|
|
|
||
|
|
# After rendering all the needed artists, blit each axes individually.
|
||
|
|
for ax in set(updated_ax):
|
||
|
|
ax.figure.canvas.blit(ax.bbox)
|
||
|
|
|
||
|
|
def _blit_clear(self, artists, bg_cache):
|
||
|
|
# Get a list of the axes that need clearing from the artists that
|
||
|
|
# have been drawn. Grab the appropriate saved background from the
|
||
|
|
# cache and restore.
|
||
|
|
axes = {a.axes for a in artists}
|
||
|
|
for a in axes:
|
||
|
|
if a in bg_cache:
|
||
|
|
a.figure.canvas.restore_region(bg_cache[a])
|
||
|
|
|
||
|
|
def _setup_blit(self):
|
||
|
|
# Setting up the blit requires: a cache of the background for the
|
||
|
|
# axes
|
||
|
|
self._blit_cache = dict()
|
||
|
|
self._drawn_artists = []
|
||
|
|
for ax in self._fig.axes:
|
||
|
|
ax.callbacks.connect('xlim_changed',
|
||
|
|
lambda ax: self._blit_cache.pop(ax, None))
|
||
|
|
ax.callbacks.connect('ylim_changed',
|
||
|
|
lambda ax: self._blit_cache.pop(ax, None))
|
||
|
|
self._resize_id = self._fig.canvas.mpl_connect('resize_event',
|
||
|
|
self._handle_resize)
|
||
|
|
self._post_draw(None, self._blit)
|
||
|
|
|
||
|
|
def _handle_resize(self, *args):
|
||
|
|
# On resize, we need to disable the resize event handling so we don't
|
||
|
|
# get too many events. Also stop the animation events, so that
|
||
|
|
# we're paused. Reset the cache and re-init. Set up an event handler
|
||
|
|
# to catch once the draw has actually taken place.
|
||
|
|
self._fig.canvas.mpl_disconnect(self._resize_id)
|
||
|
|
self.event_source.stop()
|
||
|
|
self._blit_cache.clear()
|
||
|
|
self._init_draw()
|
||
|
|
self._resize_id = self._fig.canvas.mpl_connect('draw_event',
|
||
|
|
self._end_redraw)
|
||
|
|
|
||
|
|
def _end_redraw(self, evt):
|
||
|
|
# Now that the redraw has happened, do the post draw flushing and
|
||
|
|
# blit handling. Then re-enable all of the original events.
|
||
|
|
self._post_draw(None, False)
|
||
|
|
self.event_source.start()
|
||
|
|
self._fig.canvas.mpl_disconnect(self._resize_id)
|
||
|
|
self._resize_id = self._fig.canvas.mpl_connect('resize_event',
|
||
|
|
self._handle_resize)
|
||
|
|
|
||
|
|
def to_html5_video(self, embed_limit=None):
|
||
|
|
"""
|
||
|
|
Convert the animation to an HTML5 ``<video>`` tag.
|
||
|
|
|
||
|
|
This saves the animation as an h264 video, encoded in base64
|
||
|
|
directly into the HTML5 video tag. This respects the rc parameters
|
||
|
|
for the writer as well as the bitrate. This also makes use of the
|
||
|
|
``interval`` to control the speed, and uses the ``repeat``
|
||
|
|
parameter to decide whether to loop.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
embed_limit : float, optional
|
||
|
|
Limit, in MB, of the returned animation. No animation is created
|
||
|
|
if the limit is exceeded.
|
||
|
|
Defaults to :rc:`animation.embed_limit` = 20.0.
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
video_tag : str
|
||
|
|
An HTML5 video tag with the animation embedded as base64 encoded
|
||
|
|
h264 video.
|
||
|
|
If the *embed_limit* is exceeded, this returns the string
|
||
|
|
"Video too large to embed."
|
||
|
|
"""
|
||
|
|
VIDEO_TAG = r'''<video {size} {options}>
|
||
|
|
<source type="video/mp4" src="data:video/mp4;base64,{video}">
|
||
|
|
Your browser does not support the video tag.
|
||
|
|
</video>'''
|
||
|
|
# Cache the rendering of the video as HTML
|
||
|
|
if not hasattr(self, '_base64_video'):
|
||
|
|
# Save embed limit, which is given in MB
|
||
|
|
if embed_limit is None:
|
||
|
|
embed_limit = rcParams['animation.embed_limit']
|
||
|
|
|
||
|
|
# Convert from MB to bytes
|
||
|
|
embed_limit *= 1024 * 1024
|
||
|
|
|
||
|
|
# Can't open a NamedTemporaryFile twice on Windows, so use a
|
||
|
|
# TemporaryDirectory instead.
|
||
|
|
with TemporaryDirectory() as tmpdir:
|
||
|
|
path = Path(tmpdir, "temp.m4v")
|
||
|
|
# We create a writer manually so that we can get the
|
||
|
|
# appropriate size for the tag
|
||
|
|
Writer = writers[rcParams['animation.writer']]
|
||
|
|
writer = Writer(codec='h264',
|
||
|
|
bitrate=rcParams['animation.bitrate'],
|
||
|
|
fps=1000. / self._interval)
|
||
|
|
self.save(str(path), writer=writer)
|
||
|
|
# Now open and base64 encode.
|
||
|
|
vid64 = base64.encodebytes(path.read_bytes())
|
||
|
|
|
||
|
|
vid_len = len(vid64)
|
||
|
|
if vid_len >= embed_limit:
|
||
|
|
_log.warning(
|
||
|
|
"Animation movie is %s bytes, exceeding the limit of %s. "
|
||
|
|
"If you're sure you want a large animation embedded, set "
|
||
|
|
"the animation.embed_limit rc parameter to a larger value "
|
||
|
|
"(in MB).", vid_len, embed_limit)
|
||
|
|
else:
|
||
|
|
self._base64_video = vid64.decode('ascii')
|
||
|
|
self._video_size = 'width="{}" height="{}"'.format(
|
||
|
|
*writer.frame_size)
|
||
|
|
|
||
|
|
# If we exceeded the size, this attribute won't exist
|
||
|
|
if hasattr(self, '_base64_video'):
|
||
|
|
# Default HTML5 options are to autoplay and display video controls
|
||
|
|
options = ['controls', 'autoplay']
|
||
|
|
|
||
|
|
# If we're set to repeat, make it loop
|
||
|
|
if hasattr(self, 'repeat') and self.repeat:
|
||
|
|
options.append('loop')
|
||
|
|
|
||
|
|
return VIDEO_TAG.format(video=self._base64_video,
|
||
|
|
size=self._video_size,
|
||
|
|
options=' '.join(options))
|
||
|
|
else:
|
||
|
|
return 'Video too large to embed.'
|
||
|
|
|
||
|
|
def to_jshtml(self, fps=None, embed_frames=True, default_mode=None):
|
||
|
|
"""Generate HTML representation of the animation"""
|
||
|
|
if fps is None and hasattr(self, '_interval'):
|
||
|
|
# Convert interval in ms to frames per second
|
||
|
|
fps = 1000 / self._interval
|
||
|
|
|
||
|
|
# If we're not given a default mode, choose one base on the value of
|
||
|
|
# the repeat attribute
|
||
|
|
if default_mode is None:
|
||
|
|
default_mode = 'loop' if self.repeat else 'once'
|
||
|
|
|
||
|
|
if not hasattr(self, "_html_representation"):
|
||
|
|
# Can't open a NamedTemporaryFile twice on Windows, so use a
|
||
|
|
# TemporaryDirectory instead.
|
||
|
|
with TemporaryDirectory() as tmpdir:
|
||
|
|
path = Path(tmpdir, "temp.html")
|
||
|
|
writer = HTMLWriter(fps=fps,
|
||
|
|
embed_frames=embed_frames,
|
||
|
|
default_mode=default_mode)
|
||
|
|
self.save(str(path), writer=writer)
|
||
|
|
self._html_representation = path.read_text()
|
||
|
|
|
||
|
|
return self._html_representation
|
||
|
|
|
||
|
|
def _repr_html_(self):
|
||
|
|
'''IPython display hook for rendering.'''
|
||
|
|
fmt = rcParams['animation.html']
|
||
|
|
if fmt == 'html5':
|
||
|
|
return self.to_html5_video()
|
||
|
|
elif fmt == 'jshtml':
|
||
|
|
return self.to_jshtml()
|
||
|
|
|
||
|
|
|
||
|
|
class TimedAnimation(Animation):
|
||
|
|
''':class:`Animation` subclass for time-based animation.
|
||
|
|
|
||
|
|
A new frame is drawn every *interval* milliseconds.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
fig : `~matplotlib.figure.Figure`
|
||
|
|
The figure object that is used to get draw, resize, and any
|
||
|
|
other needed events.
|
||
|
|
|
||
|
|
interval : number, optional
|
||
|
|
Delay between frames in milliseconds. Defaults to 200.
|
||
|
|
|
||
|
|
repeat_delay : number, optional
|
||
|
|
If the animation in repeated, adds a delay in milliseconds
|
||
|
|
before repeating the animation. Defaults to ``None``.
|
||
|
|
|
||
|
|
repeat : bool, optional
|
||
|
|
Controls whether the animation should repeat when the sequence
|
||
|
|
of frames is completed. Defaults to ``True``.
|
||
|
|
|
||
|
|
blit : bool, optional
|
||
|
|
Controls whether blitting is used to optimize drawing. Defaults
|
||
|
|
to ``False``.
|
||
|
|
|
||
|
|
'''
|
||
|
|
def __init__(self, fig, interval=200, repeat_delay=None, repeat=True,
|
||
|
|
event_source=None, *args, **kwargs):
|
||
|
|
# Store the timing information
|
||
|
|
self._interval = interval
|
||
|
|
self._repeat_delay = repeat_delay
|
||
|
|
self.repeat = repeat
|
||
|
|
|
||
|
|
# If we're not given an event source, create a new timer. This permits
|
||
|
|
# sharing timers between animation objects for syncing animations.
|
||
|
|
if event_source is None:
|
||
|
|
event_source = fig.canvas.new_timer()
|
||
|
|
event_source.interval = self._interval
|
||
|
|
|
||
|
|
Animation.__init__(self, fig, event_source=event_source,
|
||
|
|
*args, **kwargs)
|
||
|
|
|
||
|
|
def _step(self, *args):
|
||
|
|
'''
|
||
|
|
Handler for getting events.
|
||
|
|
'''
|
||
|
|
# Extends the _step() method for the Animation class. If
|
||
|
|
# Animation._step signals that it reached the end and we want to
|
||
|
|
# repeat, we refresh the frame sequence and return True. If
|
||
|
|
# _repeat_delay is set, change the event_source's interval to our loop
|
||
|
|
# delay and set the callback to one which will then set the interval
|
||
|
|
# back.
|
||
|
|
still_going = Animation._step(self, *args)
|
||
|
|
if not still_going and self.repeat:
|
||
|
|
self._init_draw()
|
||
|
|
self.frame_seq = self.new_frame_seq()
|
||
|
|
if self._repeat_delay:
|
||
|
|
self.event_source.remove_callback(self._step)
|
||
|
|
self.event_source.add_callback(self._loop_delay)
|
||
|
|
self.event_source.interval = self._repeat_delay
|
||
|
|
return True
|
||
|
|
else:
|
||
|
|
return Animation._step(self, *args)
|
||
|
|
else:
|
||
|
|
return still_going
|
||
|
|
|
||
|
|
def _stop(self, *args):
|
||
|
|
# If we stop in the middle of a loop delay (which is relatively likely
|
||
|
|
# given the potential pause here, remove the loop_delay callback as
|
||
|
|
# well.
|
||
|
|
self.event_source.remove_callback(self._loop_delay)
|
||
|
|
Animation._stop(self)
|
||
|
|
|
||
|
|
def _loop_delay(self, *args):
|
||
|
|
# Reset the interval and change callbacks after the delay.
|
||
|
|
self.event_source.remove_callback(self._loop_delay)
|
||
|
|
self.event_source.interval = self._interval
|
||
|
|
self.event_source.add_callback(self._step)
|
||
|
|
Animation._step(self)
|
||
|
|
|
||
|
|
|
||
|
|
class ArtistAnimation(TimedAnimation):
|
||
|
|
'''Animation using a fixed set of `Artist` objects.
|
||
|
|
|
||
|
|
Before creating an instance, all plotting should have taken place
|
||
|
|
and the relevant artists saved.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
fig : `~matplotlib.figure.Figure`
|
||
|
|
The figure object that is used to get draw, resize, and any
|
||
|
|
other needed events.
|
||
|
|
|
||
|
|
artists : list
|
||
|
|
Each list entry a collection of artists that represent what
|
||
|
|
needs to be enabled on each frame. These will be disabled for
|
||
|
|
other frames.
|
||
|
|
|
||
|
|
interval : number, optional
|
||
|
|
Delay between frames in milliseconds. Defaults to 200.
|
||
|
|
|
||
|
|
repeat_delay : number, optional
|
||
|
|
If the animation in repeated, adds a delay in milliseconds
|
||
|
|
before repeating the animation. Defaults to ``None``.
|
||
|
|
|
||
|
|
repeat : bool, optional
|
||
|
|
Controls whether the animation should repeat when the sequence
|
||
|
|
of frames is completed. Defaults to ``True``.
|
||
|
|
|
||
|
|
blit : bool, optional
|
||
|
|
Controls whether blitting is used to optimize drawing. Defaults
|
||
|
|
to ``False``.
|
||
|
|
|
||
|
|
'''
|
||
|
|
def __init__(self, fig, artists, *args, **kwargs):
|
||
|
|
# Internal list of artists drawn in the most recent frame.
|
||
|
|
self._drawn_artists = []
|
||
|
|
|
||
|
|
# Use the list of artists as the framedata, which will be iterated
|
||
|
|
# over by the machinery.
|
||
|
|
self._framedata = artists
|
||
|
|
TimedAnimation.__init__(self, fig, *args, **kwargs)
|
||
|
|
|
||
|
|
def _init_draw(self):
|
||
|
|
# Make all the artists involved in *any* frame invisible
|
||
|
|
figs = set()
|
||
|
|
for f in self.new_frame_seq():
|
||
|
|
for artist in f:
|
||
|
|
artist.set_visible(False)
|
||
|
|
artist.set_animated(self._blit)
|
||
|
|
# Assemble a list of unique figures that need flushing
|
||
|
|
if artist.get_figure() not in figs:
|
||
|
|
figs.add(artist.get_figure())
|
||
|
|
|
||
|
|
# Flush the needed figures
|
||
|
|
for fig in figs:
|
||
|
|
fig.canvas.draw_idle()
|
||
|
|
|
||
|
|
def _pre_draw(self, framedata, blit):
|
||
|
|
'''
|
||
|
|
Clears artists from the last frame.
|
||
|
|
'''
|
||
|
|
if blit:
|
||
|
|
# Let blit handle clearing
|
||
|
|
self._blit_clear(self._drawn_artists, self._blit_cache)
|
||
|
|
else:
|
||
|
|
# Otherwise, make all the artists from the previous frame invisible
|
||
|
|
for artist in self._drawn_artists:
|
||
|
|
artist.set_visible(False)
|
||
|
|
|
||
|
|
def _draw_frame(self, artists):
|
||
|
|
# Save the artists that were passed in as framedata for the other
|
||
|
|
# steps (esp. blitting) to use.
|
||
|
|
self._drawn_artists = artists
|
||
|
|
|
||
|
|
# Make all the artists from the current frame visible
|
||
|
|
for artist in artists:
|
||
|
|
artist.set_visible(True)
|
||
|
|
|
||
|
|
|
||
|
|
class FuncAnimation(TimedAnimation):
|
||
|
|
"""
|
||
|
|
Makes an animation by repeatedly calling a function *func*.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
fig : `~matplotlib.figure.Figure`
|
||
|
|
The figure object that is used to get draw, resize, and any
|
||
|
|
other needed events.
|
||
|
|
|
||
|
|
func : callable
|
||
|
|
The function to call at each frame. The first argument will
|
||
|
|
be the next value in *frames*. Any additional positional
|
||
|
|
arguments can be supplied via the *fargs* parameter.
|
||
|
|
|
||
|
|
The required signature is::
|
||
|
|
|
||
|
|
def func(frame, *fargs) -> iterable_of_artists
|
||
|
|
|
||
|
|
If ``blit == True``, *func* must return an iterable of all artists
|
||
|
|
that were modified or created. This information is used by the blitting
|
||
|
|
algorithm to determine which parts of the figure have to be updated.
|
||
|
|
The return value is unused if ``blit == False`` and may be omitted in
|
||
|
|
that case.
|
||
|
|
|
||
|
|
frames : iterable, int, generator function, or None, optional
|
||
|
|
Source of data to pass *func* and each frame of the animation
|
||
|
|
|
||
|
|
- If an iterable, then simply use the values provided. If the
|
||
|
|
iterable has a length, it will override the *save_count* kwarg.
|
||
|
|
|
||
|
|
- If an integer, then equivalent to passing ``range(frames)``
|
||
|
|
|
||
|
|
- If a generator function, then must have the signature::
|
||
|
|
|
||
|
|
def gen_function() -> obj
|
||
|
|
|
||
|
|
- If *None*, then equivalent to passing ``itertools.count``.
|
||
|
|
|
||
|
|
In all of these cases, the values in *frames* is simply passed through
|
||
|
|
to the user-supplied *func* and thus can be of any type.
|
||
|
|
|
||
|
|
init_func : callable, optional
|
||
|
|
A function used to draw a clear frame. If not given, the
|
||
|
|
results of drawing from the first item in the frames sequence
|
||
|
|
will be used. This function will be called once before the
|
||
|
|
first frame.
|
||
|
|
|
||
|
|
The required signature is::
|
||
|
|
|
||
|
|
def init_func() -> iterable_of_artists
|
||
|
|
|
||
|
|
If ``blit == True``, *init_func* must return an iterable of artists
|
||
|
|
to be re-drawn. This information is used by the blitting
|
||
|
|
algorithm to determine which parts of the figure have to be updated.
|
||
|
|
The return value is unused if ``blit == False`` and may be omitted in
|
||
|
|
that case.
|
||
|
|
|
||
|
|
fargs : tuple or None, optional
|
||
|
|
Additional arguments to pass to each call to *func*.
|
||
|
|
|
||
|
|
save_count : int, optional
|
||
|
|
The number of values from *frames* to cache.
|
||
|
|
|
||
|
|
interval : number, optional
|
||
|
|
Delay between frames in milliseconds. Defaults to 200.
|
||
|
|
|
||
|
|
repeat_delay : number, optional
|
||
|
|
If the animation in repeated, adds a delay in milliseconds
|
||
|
|
before repeating the animation. Defaults to *None*.
|
||
|
|
|
||
|
|
repeat : bool, optional
|
||
|
|
Controls whether the animation should repeat when the sequence
|
||
|
|
of frames is completed. Defaults to *True*.
|
||
|
|
|
||
|
|
blit : bool, optional
|
||
|
|
Controls whether blitting is used to optimize drawing. Note: when using
|
||
|
|
blitting any animated artists will be drawn according to their zorder.
|
||
|
|
However, they will be drawn on top of any previous artists, regardless
|
||
|
|
of their zorder. Defaults to *False*.
|
||
|
|
|
||
|
|
cache_frame_data : bool, optional
|
||
|
|
Controls whether frame data is cached. Defaults to *True*.
|
||
|
|
Disabling cache might be helpful when frames contain large objects.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, fig, func, frames=None, init_func=None, fargs=None,
|
||
|
|
save_count=None, *, cache_frame_data=True, **kwargs):
|
||
|
|
if fargs:
|
||
|
|
self._args = fargs
|
||
|
|
else:
|
||
|
|
self._args = ()
|
||
|
|
self._func = func
|
||
|
|
self._init_func = init_func
|
||
|
|
|
||
|
|
# Amount of framedata to keep around for saving movies. This is only
|
||
|
|
# used if we don't know how many frames there will be: in the case
|
||
|
|
# of no generator or in the case of a callable.
|
||
|
|
self.save_count = save_count
|
||
|
|
# Set up a function that creates a new iterable when needed. If nothing
|
||
|
|
# is passed in for frames, just use itertools.count, which will just
|
||
|
|
# keep counting from 0. A callable passed in for frames is assumed to
|
||
|
|
# be a generator. An iterable will be used as is, and anything else
|
||
|
|
# will be treated as a number of frames.
|
||
|
|
if frames is None:
|
||
|
|
self._iter_gen = itertools.count
|
||
|
|
elif callable(frames):
|
||
|
|
self._iter_gen = frames
|
||
|
|
elif np.iterable(frames):
|
||
|
|
self._iter_gen = lambda: iter(frames)
|
||
|
|
if hasattr(frames, '__len__'):
|
||
|
|
self.save_count = len(frames)
|
||
|
|
else:
|
||
|
|
self._iter_gen = lambda: iter(range(frames))
|
||
|
|
self.save_count = frames
|
||
|
|
|
||
|
|
if self.save_count is None:
|
||
|
|
# If we're passed in and using the default, set save_count to 100.
|
||
|
|
self.save_count = 100
|
||
|
|
else:
|
||
|
|
# itertools.islice returns an error when passed a numpy int instead
|
||
|
|
# of a native python int (http://bugs.python.org/issue30537).
|
||
|
|
# As a workaround, convert save_count to a native python int.
|
||
|
|
self.save_count = int(self.save_count)
|
||
|
|
|
||
|
|
self._cache_frame_data = cache_frame_data
|
||
|
|
|
||
|
|
# Needs to be initialized so the draw functions work without checking
|
||
|
|
self._save_seq = []
|
||
|
|
|
||
|
|
TimedAnimation.__init__(self, fig, **kwargs)
|
||
|
|
|
||
|
|
# Need to reset the saved seq, since right now it will contain data
|
||
|
|
# for a single frame from init, which is not what we want.
|
||
|
|
self._save_seq = []
|
||
|
|
|
||
|
|
def new_frame_seq(self):
|
||
|
|
# Use the generating function to generate a new frame sequence
|
||
|
|
return self._iter_gen()
|
||
|
|
|
||
|
|
def new_saved_frame_seq(self):
|
||
|
|
# Generate an iterator for the sequence of saved data. If there are
|
||
|
|
# no saved frames, generate a new frame sequence and take the first
|
||
|
|
# save_count entries in it.
|
||
|
|
if self._save_seq:
|
||
|
|
# While iterating we are going to update _save_seq
|
||
|
|
# so make a copy to safely iterate over
|
||
|
|
self._old_saved_seq = list(self._save_seq)
|
||
|
|
return iter(self._old_saved_seq)
|
||
|
|
else:
|
||
|
|
if self.save_count is not None:
|
||
|
|
return itertools.islice(self.new_frame_seq(), self.save_count)
|
||
|
|
|
||
|
|
else:
|
||
|
|
frame_seq = self.new_frame_seq()
|
||
|
|
|
||
|
|
def gen():
|
||
|
|
try:
|
||
|
|
for _ in range(100):
|
||
|
|
yield next(frame_seq)
|
||
|
|
except StopIteration:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
cbook.warn_deprecated(
|
||
|
|
"2.2", message="FuncAnimation.save has truncated "
|
||
|
|
"your animation to 100 frames. In the future, no "
|
||
|
|
"such truncation will occur; please pass "
|
||
|
|
"'save_count' accordingly.")
|
||
|
|
|
||
|
|
return gen()
|
||
|
|
|
||
|
|
def _init_draw(self):
|
||
|
|
# Initialize the drawing either using the given init_func or by
|
||
|
|
# calling the draw function with the first item of the frame sequence.
|
||
|
|
# For blitting, the init_func should return a sequence of modified
|
||
|
|
# artists.
|
||
|
|
if self._init_func is None:
|
||
|
|
self._draw_frame(next(self.new_frame_seq()))
|
||
|
|
|
||
|
|
else:
|
||
|
|
self._drawn_artists = self._init_func()
|
||
|
|
if self._blit:
|
||
|
|
if self._drawn_artists is None:
|
||
|
|
raise RuntimeError('The init_func must return a '
|
||
|
|
'sequence of Artist objects.')
|
||
|
|
for a in self._drawn_artists:
|
||
|
|
a.set_animated(self._blit)
|
||
|
|
self._save_seq = []
|
||
|
|
|
||
|
|
def _draw_frame(self, framedata):
|
||
|
|
if self._cache_frame_data:
|
||
|
|
# Save the data for potential saving of movies.
|
||
|
|
self._save_seq.append(framedata)
|
||
|
|
|
||
|
|
# Make sure to respect save_count (keep only the last save_count
|
||
|
|
# around)
|
||
|
|
self._save_seq = self._save_seq[-self.save_count:]
|
||
|
|
|
||
|
|
# Call the func with framedata and args. If blitting is desired,
|
||
|
|
# func needs to return a sequence of any artists that were modified.
|
||
|
|
self._drawn_artists = self._func(framedata, *self._args)
|
||
|
|
if self._blit:
|
||
|
|
if self._drawn_artists is None:
|
||
|
|
raise RuntimeError('The animation function must return a '
|
||
|
|
'sequence of Artist objects.')
|
||
|
|
self._drawn_artists = sorted(self._drawn_artists,
|
||
|
|
key=lambda x: x.get_zorder())
|
||
|
|
|
||
|
|
for a in self._drawn_artists:
|
||
|
|
a.set_animated(self._blit)
|