MoviePlotNode

class PlasmaCalcs.plotting.movies.MoviePlotNode(obj=UNSET, *, parent=None, init_plot=True, **kw_plot_settings)

Bases: PlotSettingsMixin, Tree

tree node storing a MoviePlotElement (in self.obj).

To update repeatedly & save resulting animation, see self.save() or self.get_animator().

To register updatable sub-elements use self.add_child;

when updating self will also update all children.

Subclasses must define:

get_data_at_frame(int) -> dict

INPUTS HERE:

obj: UNSET, None, or MoviePlotElement

the plot element stored in this node.

UNSET –> didn’t call init_plot.

None –> intentionally not storing an element in this node.

parent: None or MoviePlotNode

if provided, the parent of this node. None -> this node has no parent.

init_plot: bool (default: True)

whether to call self.init_plot() immediately, during __init__.

(as a PlotSetting: tells the value of init_plot passed during __init__.)

False –> still must call self.init_plot() before using self(…) or self.updater(…)

(end-user will probably never use init_plot=False; it’s mostly for internal code.)
(might use False if creating MovieImage before defining the associated Axes.)
ignored if obj is None; when obj is None, never call init_plot during __init__.

Additional kwargs can be any PlotSettings; see help(self.plot_settings) for details.

Methods

`__call__`(frame)	update the plot for the given frame.
`__getitem__`(i)	returns self.children[i].
`__init_subclass__`(args_super, *kw)	appends note about using self.plot_settings, to cls.__doc__.
`__iter__`()	iterates over self.children.
`add_child`(child)	adds this child (a Tree) to self.children.
`display`([show_depth, max_depth, shorthand])	display self in html.
`enumerate_flat`(*[, include_self])	returns a generator which iterates over all of self's descendants, in depth-first order,
`flat`(*[, include_self])	returns a generator which iterates over all of self's descendants, in depth-first order.
`flat_branches_until`(branches_until, *[, ...])	returns a generator which iterates over all of self's descendants, in depth-first order,
`get_animator`(*[, fps, blit, frames, plt_close])	returns FuncAnimation instance using self as func.
`get_data_at_frame`(frame)	return dict of data for the given frame, to be used by the MoviePlotElement at self.obj.
`get_nframes`()	return max of get_nframes_here() for self & all descendants of self.
`get_nframes_here`()	return the number of frames that could be in the movie, based on this node.
`help`()	prints a helpful message with examples for how to use this cls
`html`([show_depth, max_depth, shorthand])	returns html for displaying self and all of self's children.
`init_plot`()	plot for the first time; save self.obj = result, which should be a MoviePlotElement.
`init_plots`(*[, plotted_ok])	init_plot for self & all descendants with non-None obj.
`make_child`(obj)	makes a child of self, with obj as its stored object, and returns the child.
`make_children`(objs)	make_child(obj) for obj in objs; returns the list of newly made children.
`save`(filename[, frames, fps, blit])	save the movie to filename.
`set_parent`(parent, *[, _internal])	sets self.parent = parent.
`update_to_frame`(frame)	update the plot for the given frame.
`_get_frames`(value)	gets frames based on value and possibly self.get_nframes() if necessary.
`_init_plot_checks`()	checks to run before init_plot().
`_on_added_child`(child)	called immediately after adding a child to self.
`_on_added_descendant`(descendant)	called immediately after adding a descendant to self (or any of self.children).
`_on_adding_ancestor`(ancestor)	called immediately before adding an ancestor to self (i.e., self.parent, parent of self.parent, etc)
`_on_setting_parent`(parent)	called immediately before setting self.parent = parent.
`_repr_html_`()	returns html string for displaying self.
`_shorthand_repr`()	returns shorthand repr for this node (without children): "((depth, height, size)) obj".

Attributes

`DEFAULT_TREE_SHORTHAND`
`DEFAULT_TREE_SHOW_DEPTH`
`DEFAULT_TREE_SHOW_MAX_DEPTH`
`ani`	alias to get_animator
`depth`	number of layers above self.
`fig`	the Figure on which self is / will be plotted.
`frame`	the currently-plotted frame
`frames`	the frames that could be in the movie.
`height`	number of layers below self.
`parent`	parent node of self.
`parent_ref`	stores parent value, but internally uses weakref to avoid circular references.
`plotted`	whether this node's element has actually been plotted yet.
`plotted_data`	the currently plotted data.
`size`	number of nodes in this tree.

__call__(frame): update the plot for the given frame. return iterable of all updated artists.

Defining __call__ in this way means self is compatible for direct use by FuncAnimation.

__getitem__(i): returns self.children[i]. If i is a tuple, index repeatedly, e.g. self[i[0]][i[1]][i[2]]…

classmethod __init_subclass__(*args_super, **kw): appends note about using self.plot_settings, to cls.__doc__.

if “PlotSettings” or “plot_settings” appears in cls.__doc__, do NOT append this note;

assuming instead that this means the doc already mentions how to use plot_settings.

__iter__(): iterates over self.children.

_get_frames(value): gets frames based on value and possibly self.get_nframes() if necessary.

if result would be None, crash instead.

_init_plot_checks(): checks to run before init_plot().

Here, checks:

- if self.plotted, raise PlottingAmbiguityError.

- if self.obj is None, raise PlottingAmbiguityError.

_on_added_child(child): called immediately after adding a child to self.

Tracks depth, height, size. This method does not connect any parents or children.

_on_added_descendant(descendant): called immediately after adding a descendant to self (or any of self.children).

Tracks depth, height, size. This method does not connect any parents or children.

_on_adding_ancestor(ancestor): called immediately before adding an ancestor to self (i.e., self.parent, parent of self.parent, etc)

Tracks depth, height, size. This method does not connect any parents or children.

_on_setting_parent(parent): called immediately before setting self.parent = parent.

Tracks depth, height, size. This method does not connect any parents or children.

_repr_html_()

returns html string for displaying self. (this display hook is used by Jupyter automatically.).

Includes self.html() and DEFAULTS.TREE_CSS.

[TODO] apply the css to ONLY this output cell in Jupyter, instead of all output cells…

_shorthand_repr(): returns shorthand repr for this node (without children): “((depth, height, size)) obj”.

add_child(child): adds this child (a Tree) to self.children. Also, child.set_parent(self).

returns the added child.

property ani: alias to get_animator

property depth: number of layers above self. (parent, parent’s parents, etc.)

depth = 0 for the node with parent = None.

display(show_depth=None, max_depth=None, *, shorthand=None)

display self in html. Includes self.html() and DEFAULTS.TREE_CSS.

show_depth: None or int: max number of layers of tree to show by default (i.e. “not hidden” by default)

None –> use self.DEFAULT_TREE_SHOW_DEPTH if defined else DEFAULTS.TREE_SHOW_DEPTH
max_depth: None or int: max number of layers of tree to render (even if all layers are “not hidden”).

Anything deeper will not be converted to html string.

None –> use self.DEFAULT_TREE_SHOW_MAX_DEPTH if defined else DEFAULTS.TREE_SHOW_MAX_DEPTH
shorthand: None or bool: whether to use shorthand for the “Tree([depth=N, height=N, size=N], obj=…)” part of the repr.

True –> use shorthand; replace that^ with: “((N, N, N)) …”

None –> use self.DEFAULT_TREE_SHORTHAND if defined else DEFAULTS.TREE_SHORTHAND

enumerate_flat(*, include_self=False): returns a generator which iterates over all of self’s descendants, in depth-first order,

yielding (index, node) pairs, such that self[index] == node.

Note that index will be a tuple with length == node.depth.

if include_self, yield self first, as: ((), self)).

property fig: the Figure on which self is / will be plotted.

flat(*, include_self=False): returns a generator which iterates over all of self’s descendants, in depth-first order.

if include_self, yield self first.

flat_branches_until(branches_until, *, include_self=False): returns a generator which iterates over all of self’s descendants, in depth-first order,

but stop looking at descendants on a branch as soon as branches_until(node).

E.g. self.flat_branches_until(lambda node: node.obj==7) will be similar to flat,

but won’t go to any descendants for any node with obj==7.

if include self, yield self first, and check branches_until(self) before continuing.

otherwise, never check branches_until(self).

property frame: the currently-plotted frame

property frames: the frames that could be in the movie.

if set to None, will use self.get_nframes() instead.

if set to a slice, will use range(self.get_nframes())[frames] instead.

get_animator(*, fps=UNSET, blit=UNSET, frames=UNSET, plt_close=True, **kw_func_animation)

returns FuncAnimation instance using self as func.

Use kwarg defaults from self.plot_settings, for any kwargs not provided here.

fps: UNSET, None, or number (default: UNSET): frames per second.

UNSET –> use DEFAULTS.PLOT.FPS (default: 30).

(Or use value from self.plot_settings, if provided.)

None –> use matplotlib defaults.
blit: UNSET, None, or bool (default: UNSET): whether to use blitting.

UNSET –> use DEFAULTS.PLOT.BLIT (default: True).

(Or use value from self.plot_settings, if provided.)

if None, use matplotlib defaults.
frames: UNSET, None, int, iterable, or slice (default: UNSET): passed to FuncAnimation. Tells number of frames or which frames to plot.

If UNSET, use value from self.plot_settings if possible else getattr(self, ‘frames’, None).

if slice, use range(self.get_nframes())[frames], crashing if self doesn’t have ‘get_nframes’.
plt_close: bool: whether to plt.close() before returning the result.

This is useful in Jupyter, where commonly one cell might make a plot,

then call get_animator() to display movie in-line, but not plt.close().

In that case, plt_close=False would display animation & plot

[TODO] use init_func kwarg to avoid calling self twice for frame 0?

get_data_at_frame(frame): return dict of data for the given frame, to be used by the MoviePlotElement at self.obj.

get_nframes(): return max of get_nframes_here() for self & all descendants of self.

If any node throws PlottingNframesUnknownError, pretend they said nframes=0.

If all nodes throw PlottingNframesUnknownError, raise the one from self.

get_nframes_here(): return the number of frames that could be in the movie, based on this node.

property height: number of layers below self. (children, children’s children, etc.)

height = 0 for a node with no children.

classmethod help(): prints a helpful message with examples for how to use this cls

html(show_depth=None, max_depth=None, *, shorthand=None)

returns html for displaying self and all of self’s children.

show_depth: None or int: max number of layers of tree to show by default (i.e. “not hidden” by default)

None –> use self.DEFAULT_TREE_SHOW_DEPTH if defined else DEFAULTS.TREE_SHOW_DEPTH
max_depth: None or int: max number of layers of tree to render (even if all layers are “not hidden”).

Anything deeper will not be converted to html string.

None –> use self.DEFAULT_TREE_SHOW_MAX_DEPTH if defined else DEFAULTS.TREE_SHOW_MAX_DEPTH
shorthand: None or bool: whether to use shorthand for the “Tree([depth=N, height=N, size=N], obj=…)” part of the repr.

True –> use shorthand; replace that^ with: “((N, N, N)) …”

None –> use self.DEFAULT_TREE_SHORTHAND if defined else DEFAULTS.TREE_SHORTHAND

init_plot(): plot for the first time; save self.obj = result, which should be a MoviePlotElement.

Should also set self.frame = self.plot_settings[‘init_plot_frame’] (default 0).

init_plots(*, plotted_ok=True)

init_plot for self & all descendants with non-None obj.

plotted_ok: bool: True –> skip node if node.plotted.

False –> call init_plot on all nodes with non-None obj.

make_child(obj): makes a child of self, with obj as its stored object, and returns the child.

make_children(objs): make_child(obj) for obj in objs; returns the list of newly made children.

property parent: parent node of self. None if self is root.

When set to a value, calls self.set_parent(value),

which also updates tracking info appropriately, and updates parent’s children.

property parent_ref: stores parent value, but internally uses weakref to avoid circular references.

Users should always use self.parent instead.

property plotted: whether this node’s element has actually been plotted yet.

False before init_plot; True after. Always None if self.obj is None.

property plotted_data: the currently plotted data.

save(filename, frames=UNSET, *, fps=UNSET, blit=UNSET, **kw)

save the movie to filename.

RECOMMENDED:

first, self.save(…, frames=N), with small N (e.g. N=5), to test movie formatting.

Troubleshooting: if movie getting cut off,

try plt.subplots_adjust(bottom=0.2, left=0.2, right=0.8, top=0.8),

or even more extreme values if necessary. (0 is bottom/left edge; 1 is top/right edge.)

frames: UNSET, None, int, iterable, or slice (default: UNSET): passed to FuncAnimation. Tells number of frames or which frames to plot.

If UNSET, use value from self.plot_settings if possible else getattr(self, ‘frames’, None).

if slice, use range(self.get_nframes())[frames], crashing if self doesn’t have ‘get_nframes’.
fps: UNSET, None, or number (default: UNSET): frames per second.

UNSET –> use DEFAULTS.PLOT.FPS (default: 30).

(Or use value from self.plot_settings, if provided.)

None –> use matplotlib defaults.
blit: UNSET, None, or bool (default: UNSET): whether to use blitting.

UNSET –> use DEFAULTS.PLOT.BLIT (default: True).

(Or use value from self.plot_settings, if provided.)

if None, use matplotlib defaults.

additional kwargs passed to FuncAnimation() or FuncAnimation.save().

returns abspath of the saved movie.

set_parent(parent, *, _internal=False): sets self.parent = parent. Also, parent.add_child(self), unless _internal=True.

Users should use self.parent = parent instead of calling set_parent directly.

property size: number of nodes in this tree. (here and below)

size = 1 for a node with no children.

update_to_frame(frame): update the plot for the given frame. set self.frame=frame.

also calls update_to_frame for all children.

return iterable of all updated artists.