Source code for manim.scene.scene

"""Basic canvas for animations."""

from __future__ import annotations

__all__ = ["Scene"]

import copy
import datetime
import inspect
import platform
import random
import threading
import time
import types
from queue import Queue
from typing import Callable

import srt

from manim.scene.section import DefaultSectionType

    import dearpygui.dearpygui as dpg

    dearpygui_imported = True
except ImportError:
    dearpygui_imported = False
import numpy as np
from tqdm import tqdm
from import FileSystemEventHandler
from watchdog.observers import Observer

from manim.mobject.opengl.opengl_mobject import OpenGLPoint

from .. import config, logger
from ..animation.animation import Animation, Wait, prepare_animation
from import Camera
from ..constants import *
from ..gui.gui import configure_pygui
from ..renderer.cairo_renderer import CairoRenderer
from ..renderer.opengl_renderer import OpenGLRenderer
from ..renderer.shader import Object3D
from ..utils import opengl, space_ops
from ..utils.exceptions import EndSceneEarlyException, RerunSceneException
from import extract_mobject_family_members
from ..utils.family_ops import restructure_list_to_exclude_certain_family_members
from ..utils.file_ops import open_media_file
from ..utils.iterables import list_difference_update, list_update

[docs]class RerunSceneHandler(FileSystemEventHandler): """A class to handle rerunning a Scene after the input file is modified.""" def __init__(self, queue): super().__init__() self.queue = queue
[docs] def on_modified(self, event): self.queue.put(("rerun_file", [], {}))
[docs]class Scene: """A Scene is the canvas of your animation. The primary role of :class:`Scene` is to provide the user with tools to manage mobjects and animations. Generally speaking, a manim script consists of a class that derives from :class:`Scene` whose :meth:`Scene.construct` method is overridden by the user's code. Mobjects are displayed on screen by calling :meth:`Scene.add` and removed from screen by calling :meth:`Scene.remove`. All mobjects currently on screen are kept in :attr:`Scene.mobjects`. Animations are played by calling :meth:``. A :class:`Scene` is rendered internally by calling :meth:`Scene.render`. This in turn calls :meth:`Scene.setup`, :meth:`Scene.construct`, and :meth:`Scene.tear_down`, in that order. It is not recommended to override the ``__init__`` method in user Scenes. For code that should be ran before a Scene is rendered, use :meth:`Scene.setup` instead. Examples -------- Override the :meth:`Scene.construct` method with your code. .. code-block:: python class MyScene(Scene): def construct(self):"Hello World!"))) """ def __init__( self, renderer=None, camera_class=Camera, always_update_mobjects=False, random_seed=None, skip_animations=False, ): self.camera_class = camera_class self.always_update_mobjects = always_update_mobjects self.random_seed = random_seed self.skip_animations = skip_animations self.animations = None self.stop_condition = None self.moving_mobjects = [] self.static_mobjects = [] self.time_progression = None self.duration = None self.last_t = None self.queue = Queue() self.skip_animation_preview = False self.meshes = [] self.camera_target = ORIGIN self.widgets = [] self.dearpygui_imported = dearpygui_imported self.updaters = [] self.point_lights = [] self.ambient_light = None self.key_to_function_map = {} self.mouse_press_callbacks = [] self.interactive_mode = False if config.renderer == "opengl": # Items associated with interaction self.mouse_point = OpenGLPoint() self.mouse_drag_point = OpenGLPoint() if renderer is None: renderer = OpenGLRenderer() if renderer is None: self.renderer = CairoRenderer( camera_class=self.camera_class, skip_animations=self.skip_animations, ) else: self.renderer = renderer self.renderer.init_scene(self) self.mobjects = [] # TODO, remove need for foreground mobjects self.foreground_mobjects = [] if self.random_seed is not None: random.seed(self.random_seed) np.random.seed(self.random_seed) @property def camera(self): return def __deepcopy__(self, clone_from_id): cls = self.__class__ result = cls.__new__(cls) clone_from_id[id(self)] = result for k, v in self.__dict__.items(): if k in ["renderer", "time_progression"]: continue if k == "camera_class": setattr(result, k, v) setattr(result, k, copy.deepcopy(v, clone_from_id)) result.mobject_updater_lists = [] # Update updaters for mobject in self.mobjects: cloned_updaters = [] for updater in mobject.updaters: # Make the cloned updater use the cloned Mobjects as free variables # rather than the original ones. Analyzing function bytecode with the # dis module will help in understanding this. # # TODO: Do the same for function calls recursively. free_variable_map = inspect.getclosurevars(updater).nonlocals cloned_co_freevars = [] cloned_closure = [] for free_variable_name in updater.__code__.co_freevars: free_variable_value = free_variable_map[free_variable_name] # If the referenced variable has not been cloned, raise. if id(free_variable_value) not in clone_from_id: raise Exception( f"{free_variable_name} is referenced from an updater " "but is not an attribute of the Scene, which isn't " "allowed.", ) # Add the cloned object's name to the free variable list. cloned_co_freevars.append(free_variable_name) # Add a cell containing the cloned object's reference to the # closure list. cloned_closure.append( types.CellType(clone_from_id[id(free_variable_value)]), ) cloned_updater = types.FunctionType( updater.__code__.replace(co_freevars=tuple(cloned_co_freevars)), updater.__globals__, updater.__name__, updater.__defaults__, tuple(cloned_closure), ) cloned_updaters.append(cloned_updater) mobject_clone = clone_from_id[id(mobject)] mobject_clone.updaters = cloned_updaters if len(cloned_updaters) > 0: result.mobject_updater_lists.append((mobject_clone, cloned_updaters)) return result
[docs] def render(self, preview=False): """ Renders this Scene. Parameters --------- preview : bool If true, opens scene in a file viewer. """ self.setup() try: self.construct() except EndSceneEarlyException: pass except RerunSceneException as e: self.remove(*self.mobjects) self.renderer.clear_screen() self.renderer.num_plays = 0 return True self.tear_down() # We have to reset these settings in case of multiple renders. self.renderer.scene_finished(self) # Show info only if animations are rendered or to get image if ( self.renderer.num_plays or config["format"] == "png" or config["save_last_frame"] ): f"Rendered {str(self)}\nPlayed {self.renderer.num_plays} animations", ) # If preview open up the render after rendering. if preview: config["preview"] = True if config["preview"] or config["show_in_file_browser"]: open_media_file(self.renderer.file_writer)
[docs] def setup(self): """ This is meant to be implemented by any scenes which are commonly subclassed, and have some common setup involved before the construct method is called. """ pass
[docs] def tear_down(self): """ This is meant to be implemented by any scenes which are commonly subclassed, and have some common method to be invoked before the scene ends. """ pass
[docs] def construct(self): """Add content to the Scene. From within :meth:`Scene.construct`, display mobjects on screen by calling :meth:`Scene.add` and remove them from screen by calling :meth:`Scene.remove`. All mobjects currently on screen are kept in :attr:`Scene.mobjects`. Play animations by calling :meth:``. Notes ----- Initialization code should go in :meth:`Scene.setup`. Termination code should go in :meth:`Scene.tear_down`. Examples -------- A typical manim script includes a class derived from :class:`Scene` with an overridden :meth:`Scene.contruct` method: .. code-block:: python class MyScene(Scene): def construct(self):"Hello World!"))) See Also -------- :meth:`Scene.setup` :meth:`Scene.render` :meth:`Scene.tear_down` """ pass # To be implemented in subclasses
[docs] def next_section( self, name: str = "unnamed", type: str = DefaultSectionType.NORMAL, skip_animations: bool = False, ) -> None: """Create separation here; the last section gets finished and a new one gets created. ``skip_animations`` skips the rendering of all animations in this section. Refer to :doc:`the documentation</tutorials/a_deeper_look>` on how to use sections. """ self.renderer.file_writer.next_section(name, type, skip_animations)
def __str__(self): return self.__class__.__name__
[docs] def get_attrs(self, *keys): """ Gets attributes of a scene given the attribute's identifier/name. Parameters ---------- *keys : str Name(s) of the argument(s) to return the attribute of. Returns ------- list List of attributes of the passed identifiers. """ return [getattr(self, key) for key in keys]
[docs] def update_mobjects(self, dt): """ Begins updating all mobjects in the Scene. Parameters ---------- dt: int or float Change in time between updates. Defaults (mostly) to 1/frames_per_second """ for mobject in self.mobjects: mobject.update(dt)
def update_meshes(self, dt): for obj in self.meshes: for mesh in obj.get_family(): mesh.update(dt)
[docs] def update_self(self, dt: float): """Run all scene updater functions. Among all types of update functions (mobject updaters, mesh updaters, scene updaters), scene update functions are called last. Parameters ---------- dt Scene time since last update. See Also -------- :meth:`.Scene.add_updater` :meth:`.Scene.remove_updater` """ for func in self.updaters: func(dt)
[docs] def should_update_mobjects(self) -> bool: """ Returns True if the mobjects of this scene should be updated. In particular, this checks whether - the :attr:`always_update_mobjects` attribute of :class:`.Scene` is set to ``True``, - the :class:`.Scene` itself has time-based updaters attached, - any mobject in this :class:`.Scene` has time-based updaters attached. This is only called when a single Wait animation is played. """ wait_animation = self.animations[0] if wait_animation.is_static_wait is None: should_update = ( self.always_update_mobjects or self.updaters or any( [ mob.has_time_based_updater() for mob in self.get_mobject_family_members() ], ) ) wait_animation.is_static_wait = not should_update return not wait_animation.is_static_wait
[docs] def get_top_level_mobjects(self): """ Returns all mobjects which are not submobjects. Returns ------- list List of top level mobjects. """ # Return only those which are not in the family # of another mobject from the scene families = [m.get_family() for m in self.mobjects] def is_top_level(mobject): num_families = sum((mobject in family) for family in families) return num_families == 1 return list(filter(is_top_level, self.mobjects))
[docs] def get_mobject_family_members(self): """ Returns list of family-members of all mobjects in scene. If a Circle() and a VGroup(Rectangle(),Triangle()) were added, it returns not only the Circle(), Rectangle() and Triangle(), but also the VGroup() object. Returns ------- list List of mobject family members. """ if config.renderer == "opengl": family_members = [] for mob in self.mobjects: family_members.extend(mob.get_family()) return family_members else: return extract_mobject_family_members( self.mobjects,, )
[docs] def add(self, *mobjects): """ Mobjects will be displayed, from background to foreground in the order with which they are added. Parameters --------- *mobjects : Mobject Mobjects to add. Returns ------- Scene The same scene after adding the Mobjects in. """ if config.renderer == "opengl": new_mobjects = [] new_meshes = [] for mobject_or_mesh in mobjects: if isinstance(mobject_or_mesh, Object3D): new_meshes.append(mobject_or_mesh) else: new_mobjects.append(mobject_or_mesh) self.remove(*new_mobjects) self.mobjects += new_mobjects self.remove(*new_meshes) self.meshes += new_meshes else: mobjects = [*mobjects, *self.foreground_mobjects] self.restructure_mobjects(to_remove=mobjects) self.mobjects += mobjects if self.moving_mobjects: self.restructure_mobjects( to_remove=mobjects, mobject_list_name="moving_mobjects", ) self.moving_mobjects += mobjects return self
def add_mobjects_from_animations(self, animations): curr_mobjects = self.get_mobject_family_members() for animation in animations: if animation.is_introducer(): continue # Anything animated that's not already in the # scene gets added to the scene mob = animation.mobject if mob is not None and mob not in curr_mobjects: self.add(mob) curr_mobjects += mob.get_family()
[docs] def remove(self, *mobjects): """ Removes mobjects in the passed list of mobjects from the scene and the foreground, by removing them from "mobjects" and "foreground_mobjects" Parameters ---------- *mobjects : Mobject The mobjects to remove. """ if config.renderer == "opengl": mobjects_to_remove = [] meshes_to_remove = set() for mobject_or_mesh in mobjects: if isinstance(mobject_or_mesh, Object3D): meshes_to_remove.add(mobject_or_mesh) else: mobjects_to_remove.append(mobject_or_mesh) self.mobjects = restructure_list_to_exclude_certain_family_members( self.mobjects, mobjects_to_remove, ) self.meshes = list( filter(lambda mesh: mesh not in set(meshes_to_remove), self.meshes), ) return self else: for list_name in "mobjects", "foreground_mobjects": self.restructure_mobjects(mobjects, list_name, False) return self
[docs] def add_updater(self, func: Callable[[float], None]) -> None: """Add an update function to the scene. The scene updater functions are run every frame, and they are the last type of updaters to run. .. WARNING:: When using the Cairo renderer, scene updaters that modify mobjects are not detected in the same way that mobject updaters are. To be more concrete, a mobject only modified via a scene updater will not necessarily be added to the list of *moving mobjects* and thus might not be updated every frame. TL;DR: Use mobject updaters to update mobjects. Parameters ---------- func The updater function. It takes a float, which is the time difference since the last update (usually equal to the frame rate). See also -------- :meth:`.Scene.remove_updater` :meth:`.Scene.update_self` """ self.updaters.append(func)
[docs] def remove_updater(self, func: Callable[[float], None]) -> None: """Remove an update function from the scene. Parameters ---------- func The updater function to be removed. See also -------- :meth:`.Scene.add_updater` :meth:`.Scene.update_self` """ self.updaters = [f for f in self.updaters if f is not func]
[docs] def restructure_mobjects( self, to_remove, mobject_list_name="mobjects", extract_families=True, ): """ tl:wr If your scene has a Group(), and you removed a mobject from the Group, this dissolves the group and puts the rest of the mobjects directly in self.mobjects or self.foreground_mobjects. In cases where the scene contains a group, e.g. Group(m1, m2, m3), but one of its submobjects is removed, e.g. scene.remove(m1), the list of mobjects will be edited to contain other submobjects, but not m1, e.g. it will now insert m2 and m3 to where the group once was. Parameters ---------- to_remove : Mobject The Mobject to remove. mobject_list_name : str, optional The list of mobjects ("mobjects", "foreground_mobjects" etc) to remove from. extract_families : bool, optional Whether the mobject's families should be recursively extracted. Returns ------- Scene The Scene mobject with restructured Mobjects. """ if extract_families: to_remove = extract_mobject_family_members( to_remove,, ) _list = getattr(self, mobject_list_name) new_list = self.get_restructured_mobject_list(_list, to_remove) setattr(self, mobject_list_name, new_list) return self
[docs] def get_restructured_mobject_list(self, mobjects, to_remove): """ Given a list of mobjects and a list of mobjects to be removed, this filters out the removable mobjects from the list of mobjects. Parameters ---------- mobjects : list The Mobjects to check. to_remove : list The list of mobjects to remove. Returns ------- list The list of mobjects with the mobjects to remove removed. """ new_mobjects = [] def add_safe_mobjects_from_list(list_to_examine, set_to_remove): for mob in list_to_examine: if mob in set_to_remove: continue intersect = set_to_remove.intersection(mob.get_family()) if intersect: add_safe_mobjects_from_list(mob.submobjects, intersect) else: new_mobjects.append(mob) add_safe_mobjects_from_list(mobjects, set(to_remove)) return new_mobjects
# TODO, remove this, and calls to this
[docs] def add_foreground_mobjects(self, *mobjects): """ Adds mobjects to the foreground, and internally to the list foreground_mobjects, and mobjects. Parameters ---------- *mobjects : Mobject The Mobjects to add to the foreground. Returns ------ Scene The Scene, with the foreground mobjects added. """ self.foreground_mobjects = list_update(self.foreground_mobjects, mobjects) self.add(*mobjects) return self
[docs] def add_foreground_mobject(self, mobject): """ Adds a single mobject to the foreground, and internally to the list foreground_mobjects, and mobjects. Parameters ---------- mobject : Mobject The Mobject to add to the foreground. Returns ------ Scene The Scene, with the foreground mobject added. """ return self.add_foreground_mobjects(mobject)
[docs] def remove_foreground_mobjects(self, *to_remove): """ Removes mobjects from the foreground, and internally from the list foreground_mobjects. Parameters ---------- *to_remove : Mobject The mobject(s) to remove from the foreground. Returns ------ Scene The Scene, with the foreground mobjects removed. """ self.restructure_mobjects(to_remove, "foreground_mobjects") return self
[docs] def remove_foreground_mobject(self, mobject): """ Removes a single mobject from the foreground, and internally from the list foreground_mobjects. Parameters ---------- mobject : Mobject The mobject to remove from the foreground. Returns ------ Scene The Scene, with the foreground mobject removed. """ return self.remove_foreground_mobjects(mobject)
[docs] def bring_to_front(self, *mobjects): """ Adds the passed mobjects to the scene again, pushing them to he front of the scene. Parameters ---------- *mobjects : Mobject The mobject(s) to bring to the front of the scene. Returns ------ Scene The Scene, with the mobjects brought to the front of the scene. """ self.add(*mobjects) return self
[docs] def bring_to_back(self, *mobjects): """ Removes the mobject from the scene and adds them to the back of the scene. Parameters ---------- *mobjects : Mobject The mobject(s) to push to the back of the scene. Returns ------ Scene The Scene, with the mobjects pushed to the back of the scene. """ self.remove(*mobjects) self.mobjects = list(mobjects) + self.mobjects return self
[docs] def clear(self): """ Removes all mobjects present in self.mobjects and self.foreground_mobjects from the scene. Returns ------ Scene The Scene, with all of its mobjects in self.mobjects and self.foreground_mobjects removed. """ self.mobjects = [] self.foreground_mobjects = [] return self
[docs] def get_moving_mobjects(self, *animations): """ Gets all moving mobjects in the passed animation(s). Parameters ---------- *animations : Animation The animations to check for moving mobjects. Returns ------ list The list of mobjects that could be moving in the Animation(s) """ # Go through mobjects from start to end, and # as soon as there's one that needs updating of # some kind per frame, return the list from that # point forward. animation_mobjects = [anim.mobject for anim in animations] mobjects = self.get_mobject_family_members() for i, mob in enumerate(mobjects): update_possibilities = [ mob in animation_mobjects, len(mob.get_family_updaters()) > 0, mob in self.foreground_mobjects, ] if any(update_possibilities): return mobjects[i:] return []
def get_moving_and_static_mobjects(self, animations): all_mobjects = list_update(self.mobjects, self.foreground_mobjects) all_mobject_families = extract_mobject_family_members( all_mobjects,, only_those_with_points=True, ) moving_mobjects = self.get_moving_mobjects(*animations) all_moving_mobject_families = extract_mobject_family_members( moving_mobjects,, ) static_mobjects = list_difference_update( all_mobject_families, all_moving_mobject_families, ) return all_moving_mobject_families, static_mobjects
[docs] def compile_animations(self, *args, **kwargs): """ Creates _MethodAnimations from any _AnimationBuilders and updates animation kwargs with kwargs passed to play(). Parameters ---------- *args : Tuple[:class:`Animation`] Animations to be played. **kwargs Configuration for the call to play(). Returns ------- Tuple[:class:`Animation`] Animations to be played. """ animations = [] for arg in args: try: animations.append(prepare_animation(arg)) except TypeError: if inspect.ismethod(arg): raise TypeError( "Passing Mobject methods to is no longer" " supported. Use Mobject.animate instead.", ) else: raise TypeError( f"Unexpected argument {arg} passed to", ) for animation in animations: for k, v in kwargs.items(): setattr(animation, k, v) return animations
def _get_animation_time_progression(self, animations, duration): """ You will hardly use this when making your own animations. This method is for Manim's internal use. Uses :func:`~.get_time_progression` to obtain a CommandLine ProgressBar whose ``fill_time`` is dependent on the qualities of the passed Animation, Parameters ---------- animations : List[:class:`~.Animation`, ...] The list of animations to get the time progression for. duration : int or float duration of wait time Returns ------- time_progression The CommandLine Progress Bar. """ if len(animations) == 1 and isinstance(animations[0], Wait): stop_condition = animations[0].stop_condition if stop_condition is not None: time_progression = self.get_time_progression( duration, f"Waiting for {stop_condition.__name__}", n_iterations=-1, # So it doesn't show % progress override_skip_animations=True, ) else: time_progression = self.get_time_progression( duration, f"Waiting {self.renderer.num_plays}", ) else: time_progression = self.get_time_progression( duration, "".join( [ f"Animation {self.renderer.num_plays}: ", str(animations[0]), (", etc." if len(animations) > 1 else ""), ], ), ) return time_progression
[docs] def get_time_progression( self, run_time, description, n_iterations=None, override_skip_animations=False, ): """ You will hardly use this when making your own animations. This method is for Manim's internal use. Returns a CommandLine ProgressBar whose ``fill_time`` is dependent on the ``run_time`` of an animation, the iterations to perform in that animation and a bool saying whether or not to consider the skipped animations. Parameters ---------- run_time : float The ``run_time`` of the animation. n_iterations : int, optional The number of iterations in the animation. override_skip_animations : bool, optional Whether or not to show skipped animations in the progress bar. Returns ------- time_progression The CommandLine Progress Bar. """ if self.renderer.skip_animations and not override_skip_animations: times = [run_time] else: step = 1 / config["frame_rate"] times = np.arange(0, run_time, step) time_progression = tqdm( times, desc=description, total=n_iterations, leave=config["progress_bar"] == "leave", ascii=True if platform.system() == "Windows" else None, disable=config["progress_bar"] == "none", ) return time_progression
[docs] def get_run_time(self, animations): """ Gets the total run time for a list of animations. Parameters ---------- animations : List[:class:`Animation`, ...] A list of the animations whose total ``run_time`` is to be calculated. Returns ------- float The total ``run_time`` of all of the animations in the list. """ if len(animations) == 1 and isinstance(animations[0], Wait): if animations[0].stop_condition is not None: return 0 else: return animations[0].duration else: return np.max([animation.run_time for animation in animations])
[docs] def play( self, *args, subcaption=None, subcaption_duration=None, subcaption_offset=0, **kwargs, ): r"""Plays an animation in this scene. Parameters ---------- args Animations to be played. subcaption The content of the external subcaption that should be added during the animation. subcaption_duration The duration for which the specified subcaption is added. If ``None`` (the default), the run time of the animation is taken. subcaption_offset An offset (in seconds) for the start time of the added subcaption. kwargs All other keywords are passed to the renderer. """ start_time = self.renderer.time, *args, **kwargs) run_time = self.renderer.time - start_time if subcaption: if subcaption_duration is None: subcaption_duration = run_time # The start of the subcaption needs to be offset by the # run_time of the animation because it is added after # the animation has already been played (and Scene.renderer.time # has already been updated). self.add_subcaption( content=subcaption, duration=subcaption_duration, offset=-run_time + subcaption_offset, )
[docs] def wait( self, duration: float = DEFAULT_WAIT_TIME, stop_condition: Callable[[], bool] | None = None, frozen_frame: bool | None = None, ): """Plays a "no operation" animation. Parameters ---------- duration The run time of the animation. stop_condition A function without positional arguments that is evaluated every time a frame is rendered. The animation only stops when the return value of the function is truthy. Overrides any value passed to ``duration``. frozen_frame If True, updater functions are not evaluated, and the animation outputs a frozen frame. If False, updater functions are called and frames are rendered as usual. If None (the default), the scene tries to determine whether or not the frame is frozen on its own. See also -------- :class:`.Wait`, :meth:`.should_mobjects_update` """ Wait( run_time=duration, stop_condition=stop_condition, frozen_frame=frozen_frame, ) )
[docs] def pause(self, duration: float = DEFAULT_WAIT_TIME): """Pauses the scene (i.e., displays a frozen frame). This is an alias for :meth:`.wait` with ``frozen_frame`` set to ``True``. Parameters ---------- duration The duration of the pause. See also -------- :meth:`.wait`, :class:`.Wait` """ self.wait(duration=duration, frozen_frame=True)
[docs] def wait_until(self, stop_condition, max_time=60): """ Like a wrapper for wait(). You pass a function that determines whether to continue waiting, and a max wait time if that is never fulfilled. Parameters ---------- stop_condition : function The function whose boolean return value determines whether to continue waiting max_time : int or float, optional The maximum wait time in seconds, if the stop_condition is never fulfilled. """ self.wait(max_time, stop_condition=stop_condition)
[docs] def compile_animation_data(self, *animations: Animation, **play_kwargs): """Given a list of animations, compile the corresponding static and moving mobjects, and gather the animation durations. This also begins the animations. Parameters ---------- skip_rendering : bool, optional Whether the rendering should be skipped, by default False Returns ------- self, None None if there is nothing to play, or self otherwise. """ # NOTE TODO : returns statement of this method are wrong. It should return nothing, as it makes a little sense to get any information from this method. # The return are kept to keep webgl renderer from breaking. if len(animations) == 0: raise ValueError("Called with no animations") self.animations = self.compile_animations(*animations, **play_kwargs) self.add_mobjects_from_animations(self.animations) self.last_t = 0 self.stop_condition = None self.moving_mobjects = [] self.static_mobjects = [] if len(self.animations) == 1 and isinstance(self.animations[0], Wait): if self.should_update_mobjects(): self.update_mobjects(dt=0) # Any problems with this? self.stop_condition = self.animations[0].stop_condition else: self.duration = self.animations[0].duration # Static image logic when the wait is static is done by the renderer, not here. self.animations[0].is_static_wait = True return None self.duration = self.get_run_time(self.animations) return self
[docs] def begin_animations(self) -> None: """Start the animations of the scene.""" for animation in self.animations: animation._setup_scene(self) animation.begin() if config.renderer != "opengl": # Paint all non-moving objects onto the screen, so they don't # have to be rendered every frame ( self.moving_mobjects, self.static_mobjects, ) = self.get_moving_and_static_mobjects(self.animations)
[docs] def is_current_animation_frozen_frame(self) -> bool: """Returns whether the current animation produces a static frame (generally a Wait).""" return ( isinstance(self.animations[0], Wait) and len(self.animations) == 1 and self.animations[0].is_static_wait )
[docs] def play_internal(self, skip_rendering=False): """ This method is used to prep the animations for rendering, apply the arguments and parameters required to them, render them, and write them to the video file. Parameters ---------- args Animation or mobject with mobject method and params kwargs named parameters affecting what was passed in ``args``, e.g. ``run_time``, ``lag_ratio`` and so on. """ self.duration = self.get_run_time(self.animations) self.time_progression = self._get_animation_time_progression( self.animations, self.duration, ) for t in self.time_progression: self.update_to_time(t) if not skip_rendering and not self.skip_animation_preview: self.renderer.render(self, t, self.moving_mobjects) if self.stop_condition is not None and self.stop_condition(): self.time_progression.close() break for animation in self.animations: animation.finish() animation.clean_up_from_scene(self) if not self.renderer.skip_animations: self.update_mobjects(0) self.renderer.static_image = None # Closing the progress bar at the end of the play. self.time_progression.close()
def check_interactive_embed_is_valid(self): if config["force_window"]: return True if self.skip_animation_preview: logger.warning( "Disabling interactive embed as 'skip_animation_preview' is enabled", ) return False elif config["write_to_movie"]: logger.warning("Disabling interactive embed as 'write_to_movie' is enabled") return False elif config["format"]: logger.warning( "Disabling interactive embed as '--format' is set as " + config["format"], ) return False elif not self.renderer.window: logger.warning("Disabling interactive embed as no window was created") return False elif config.dry_run: logger.warning("Disabling interactive embed as dry_run is enabled") return False return True
[docs] def interactive_embed(self): """ Like embed(), but allows for screen interaction. """ if not self.check_interactive_embed_is_valid(): return self.interactive_mode = True def ipython(shell, namespace): import manim.opengl def load_module_into_namespace(module, namespace): for name in dir(module): namespace[name] = getattr(module, name) load_module_into_namespace(manim, namespace) load_module_into_namespace(manim.opengl, namespace) def embedded_rerun(*args, **kwargs): self.queue.put(("rerun_keyboard", args, kwargs)) shell.exiter() namespace["rerun"] = embedded_rerun shell(local_ns=namespace) self.queue.put(("exit_keyboard", [], {})) def get_embedded_method(method_name): return lambda *args, **kwargs: self.queue.put((method_name, args, kwargs)) local_namespace = inspect.currentframe().f_back.f_locals for method in ("play", "wait", "add", "remove"): embedded_method = get_embedded_method(method) # Allow for calling scene methods without prepending 'self.'. local_namespace[method] = embedded_method from IPython.terminal.embed import InteractiveShellEmbed from traitlets.config import Config cfg = Config() cfg.TerminalInteractiveShell.confirm_exit = False shell = InteractiveShellEmbed(config=cfg) keyboard_thread = threading.Thread( target=ipython, args=(shell, local_namespace), ) # run as daemon to kill thread when main thread exits if not shell.pt_app: keyboard_thread.daemon = True keyboard_thread.start() if self.dearpygui_imported and config["enable_gui"]: if not dpg.is_dearpygui_running(): gui_thread = threading.Thread( target=configure_pygui, args=(self.renderer, self.widgets), kwargs={"update": False}, ) gui_thread.start() else: configure_pygui(self.renderer, self.widgets, update=True) = self.interact(shell, keyboard_thread)
def interact(self, shell, keyboard_thread): event_handler = RerunSceneHandler(self.queue) file_observer = Observer() file_observer.schedule(event_handler, config["input_file"], recursive=True) file_observer.start() self.quit_interaction = False keyboard_thread_needs_join = shell.pt_app is not None assert self.queue.qsize() == 0 last_time = time.time() while not (self.renderer.window.is_closing or self.quit_interaction): if not self.queue.empty(): tup = self.queue.get_nowait() if tup[0].startswith("rerun"): # Intentionally skip calling join() on the file thread to save time. if not tup[0].endswith("keyboard"): if shell.pt_app: file_observer.unschedule_all() raise RerunSceneException keyboard_thread.join() kwargs = tup[2] if "from_animation_number" in kwargs: config["from_animation_number"] = kwargs[ "from_animation_number" ] # # TODO: This option only makes sense if interactive_embed() is run at the # # end of a scene by default. # if "upto_animation_number" in kwargs: # config["upto_animation_number"] = kwargs[ # "upto_animation_number" # ] keyboard_thread.join() file_observer.unschedule_all() raise RerunSceneException elif tup[0].startswith("exit"): # Intentionally skip calling join() on the file thread to save time. if not tup[0].endswith("keyboard") and shell.pt_app: keyboard_thread.join() # Remove exit_keyboard from the queue if necessary. while self.queue.qsize() > 0: self.queue.get() keyboard_thread_needs_join = False break else: method, args, kwargs = tup getattr(self, method)(*args, **kwargs) else: self.renderer.animation_start_time = 0 dt = time.time() - last_time last_time = time.time() self.renderer.render(self, dt, self.moving_mobjects) self.update_mobjects(dt) self.update_meshes(dt) self.update_self(dt) # Join the keyboard thread if necessary. if shell is not None and keyboard_thread_needs_join: keyboard_thread.join() # Remove exit_keyboard from the queue if necessary. while self.queue.qsize() > 0: self.queue.get() file_observer.stop() file_observer.join() if self.dearpygui_imported and config["enable_gui"]: dpg.stop_dearpygui() if self.renderer.window.is_closing: self.renderer.window.destroy() def embed(self): if not config["preview"]: logger.warning("Called embed() while no preview window is available.") return if config["write_to_movie"]: logger.warning("embed() is skipped while writing to a file.") return self.renderer.animation_start_time = 0 self.renderer.render(self, -1, self.moving_mobjects) # Configure IPython shell. from IPython.terminal.embed import InteractiveShellEmbed shell = InteractiveShellEmbed() # Have the frame update after each command "post_run_cell", lambda *a, **kw: self.renderer.render(self, -1, self.moving_mobjects), ) # Use the locals of the caller as the local namespace # once embedded, and add a few custom shortcuts. local_ns = inspect.currentframe().f_back.f_locals # local_ns["touch"] = self.interact for method in ( "play", "wait", "add", "remove", "interact", # "clear", # "save_state", # "restore", ): local_ns[method] = getattr(self, method) shell(local_ns=local_ns, stack_depth=2) # End scene when exiting an embed. raise Exception("Exiting scene.") def update_to_time(self, t): dt = t - self.last_t self.last_t = t for animation in self.animations: animation.update_mobjects(dt) alpha = t / animation.run_time animation.interpolate(alpha) self.update_mobjects(dt) self.update_meshes(dt) self.update_self(dt)
[docs] def add_subcaption( self, content: str, duration: float = 1, offset: float = 0 ) -> None: r"""Adds an entry in the corresponding subcaption file at the current time stamp. The current time stamp is obtained from ``Scene.renderer.time``. Parameters ---------- content The subcaption content. duration The duration (in seconds) for which the subcaption is shown. offset This offset (in seconds) is added to the starting time stamp of the subcaption. Examples -------- This example illustrates both possibilities for adding subcaptions to Manimations:: class SubcaptionExample(Scene): def construct(self): square = Square() circle = Circle() # first option: via the add_subcaption method self.add_subcaption("Hello square!", duration=1) # second option: within the call to Transform(square, circle), subcaption="The square transforms." ) """ subtitle = srt.Subtitle( index=len(self.renderer.file_writer.subcaptions), content=content, start=datetime.timedelta(seconds=self.renderer.time + offset), end=datetime.timedelta(seconds=self.renderer.time + offset + duration), ) self.renderer.file_writer.subcaptions.append(subtitle)
[docs] def add_sound(self, sound_file, time_offset=0, gain=None, **kwargs): """ This method is used to add a sound to the animation. Parameters ---------- sound_file : str The path to the sound file. time_offset : int,float, optional The offset in the sound file after which the sound can be played. gain : float Amplification of the sound. Examples -------- .. manim:: SoundExample class SoundExample(Scene): # Source of sound under Creative Commons 0 License. def construct(self): dot = Dot().set_color(GREEN) self.add_sound("click.wav") self.add(dot) self.wait() self.add_sound("click.wav") dot.set_color(BLUE) self.wait() self.add_sound("click.wav") dot.set_color(RED) self.wait() Download the resource for the previous example `here <>`_ . """ if self.renderer.skip_animations: return time = self.renderer.time + time_offset self.renderer.file_writer.add_sound(sound_file, time, gain, **kwargs)
def on_mouse_motion(self, point, d_point): self.mouse_point.move_to(point) if SHIFT_VALUE in self.renderer.pressed_keys: shift = -d_point shift[0] *= / 2 shift[1] *= / 2 transform = shift =, shift) def on_mouse_scroll(self, point, offset): if not config.use_projection_stroke_shaders: factor = 1 + np.arctan(-2.1 * offset[1]), about_point=self.camera_target) self.mouse_scroll_orbit_controls(point, offset) def on_key_press(self, symbol, modifiers): try: char = chr(symbol) except OverflowError: logger.warning("The value of the pressed key is too large.") return if char == "r": self.camera_target = np.array([0, 0, 0], dtype=np.float32) elif char == "q": self.quit_interaction = True else: if char in self.key_to_function_map: self.key_to_function_map[char]() def on_key_release(self, symbol, modifiers): pass def on_mouse_drag(self, point, d_point, buttons, modifiers): self.mouse_drag_point.move_to(point) if buttons == 1:[0])[1]) elif buttons == 4: camera_x_axis =[:3, 0] horizontal_shift_vector = -d_point[0] * camera_x_axis vertical_shift_vector = -d_point[1] * np.cross(OUT, camera_x_axis) total_shift_vector = horizontal_shift_vector + vertical_shift_vector * total_shift_vector) self.mouse_drag_orbit_controls(point, d_point, buttons, modifiers) def mouse_scroll_orbit_controls(self, point, offset): camera_to_target = self.camera_target - camera_to_target *= np.sign(offset[1]) shift_vector = 0.01 * camera_to_target = ( opengl.translation_matrix(*shift_vector) @ ) def mouse_drag_orbit_controls(self, point, d_point, buttons, modifiers): # Left click drag. if buttons == 1: # Translate to target the origin and rotate around the z axis. = ( opengl.rotation_matrix(z=-d_point[0]) @ opengl.translation_matrix(*-self.camera_target) @ ) # Rotation off of the z axis. camera_position = camera_y_axis =[:3, 1] axis_of_rotation = space_ops.normalize( np.cross(camera_y_axis, camera_position), ) rotation_matrix = space_ops.rotation_matrix( d_point[1], axis_of_rotation, homogeneous=True, ) maximum_polar_angle = minimum_polar_angle = potential_camera_model_matrix = rotation_matrix @ potential_camera_location = potential_camera_model_matrix[:3, 3] potential_camera_y_axis = potential_camera_model_matrix[:3, 1] sign = ( np.sign(potential_camera_y_axis[2]) if potential_camera_y_axis[2] != 0 else 1 ) potential_polar_angle = sign * np.arccos( potential_camera_location[2] / np.linalg.norm(potential_camera_location), ) if minimum_polar_angle <= potential_polar_angle <= maximum_polar_angle: = potential_camera_model_matrix else: sign = np.sign(camera_y_axis[2]) if camera_y_axis[2] != 0 else 1 current_polar_angle = sign * np.arccos( camera_position[2] / np.linalg.norm(camera_position), ) if potential_polar_angle > maximum_polar_angle: polar_angle_delta = maximum_polar_angle - current_polar_angle else: polar_angle_delta = minimum_polar_angle - current_polar_angle rotation_matrix = space_ops.rotation_matrix( polar_angle_delta, axis_of_rotation, homogeneous=True, ) = rotation_matrix @ # Translate to target the original target. = ( opengl.translation_matrix(*self.camera_target) @ ) # Right click drag. elif buttons == 4: camera_x_axis =[:3, 0] horizontal_shift_vector = -d_point[0] * camera_x_axis vertical_shift_vector = -d_point[1] * np.cross(OUT, camera_x_axis) total_shift_vector = horizontal_shift_vector + vertical_shift_vector = ( opengl.translation_matrix(*total_shift_vector) @ ) self.camera_target += total_shift_vector def set_key_function(self, char, func): self.key_to_function_map[char] = func def on_mouse_press(self, point, button, modifiers): for func in self.mouse_press_callbacks: func()