from PIL import Image from colour import Color import numpy as np import itertools as it import warnings import time import os import copy from tqdm import tqdm as ProgressDisplay import inspect import subprocess as sp from helpers import * from camera import Camera from tk_scene import TkSceneRoot from mobject import Mobject from animation import Animation from animation.transform import ApplyMethod class Scene(object): CONFIG = { "camera_config" : {}, "frame_duration" : DEFAULT_FRAME_DURATION, "construct_args" : [], "skip_animations" : False, } def __init__(self, **kwargs): digest_config(self, kwargs) self.camera = Camera(**self.camera_config) self.frames = [] self.mobjects = [] self.num_plays = 0 self.setup() self.construct(*self.construct_args) def setup(self): pass #For any common super classes to set up. def construct(self): pass #To be implemented in subclasses def __str__(self): if hasattr(self, "name"): return self.name return self.__class__.__name__ + \ self.args_to_string(*self.construct_args) def set_name(self, name): self.name = name return self ### Only these methods should touch the camera def set_camera(self, camera): self.camera = camera def get_frame(self): return self.camera.get_image() def update_frame(self, mobjects = None, background = None, **kwargs): if mobjects is None: mobjects = self.mobjects if background is not None: self.camera.set_image(background) else: self.camera.reset() self.camera.capture_mobjects(mobjects, **kwargs) def freeze_background(self): self.update_frame() self.set_camera(Camera(self.get_frame())) self.clear() ### def extract_mobjects_with_points(self, *mobjects): return list(it.chain(*[ m.family_members_with_points() for m in mobjects ])) def add(self, *mobjects): """ Mobjects will be displayed, from background to foreground, in the order with which they are entered. Scene class only keeps track of top-level monjects, all concerns with submobjects is left to animations and subclass implementations of the construct method. """ if not all_elements_are_instances(mobjects, Mobject): raise Exception("Adding something which is not a mobject") old_mobjects = filter(lambda m : m not in mobjects, self.mobjects) self.mobjects = old_mobjects + list(mobjects) return self def add_mobjects_among(self, values): """ So a scene can just add all mobjects it's defined up to that point by calling add_mobjects_among(locals().values()) """ mobjects = filter(lambda x : isinstance(x, Mobject), values) self.add(*mobjects) return self def remove(self, *mobjects): if not all_elements_are_instances(mobjects, Mobject): raise Exception("Removing something which is not a mobject") mobjects = list(it.chain(*[m.submobject_family() for m in mobjects])) if len(mobjects) == 0: return self.mobjects = filter( lambda m : not set( m.family_members_with_points() ).issubset(mobjects), self.mobjects ) return self def bring_to_front(self, *mobjects): self.add(*mobjects) return self def bring_to_back(self, *mobjects): self.remove(*mobjects) self.mobjects = mobjects + self.mobjects return self def clear(self): self.mobjects = [] return self def get_mobjects(self): return list(self.mobjects) def get_mobject_copies(self): return [m.copy() for m in self.mobjects] def align_run_times(self, *animations, **kwargs): for animation in animations: animation.update_config(**kwargs) max_run_time = max([a.run_time for a in animations]) for animation in animations: if animation.run_time != max_run_time: new_rate_func = squish_rate_func( animation.get_rate_func(), 0, 1./max_run_time ) animation.set_rate_func(new_rate_func) animation.set_run_time(max_run_time) return animations def separate_moving_and_static_mobjects(self, *animations): """ """ moving_mobjects = [anim.mobject for anim in animations] moving_parts = self.extract_mobjects_with_points(*moving_mobjects) static_mobjects = filter( lambda m : m not in moving_parts, self.extract_mobjects_with_points(*self.mobjects) ) return moving_mobjects, static_mobjects def get_time_progression(self, animations): run_time = animations[0].run_time times = np.arange(0, run_time, self.frame_duration) time_progression = ProgressDisplay(times) time_progression.set_description("".join([ "Animation %d: "%self.num_plays, str(animations[0]), (", etc." if len(animations) > 1 else ""), ])) return time_progression def compile_play_args_to_animation_list(self, *args): """ Eacn arg can either be an animation, or a mobject method followed by that methods arguments. This animation list is built by going through the args list, and each animation is simply added, but when a mobject method s hit, an ApplyMethod animation is built using the args that follow up until either another animation is hit, another method is hit, or the args list runs out. """ animations = [] method_state = { "method" : None, "args" : [] } def compile_method(state, animations): if state["method"] is None: return animations.append(ApplyMethod( state["method"], *state["args"] )) state["method"] = None state["args"] = [] for arg in args: if isinstance(arg, Animation): compile_method(method_state, animations) animations.append(arg) elif inspect.ismethod(arg): compile_method(method_state, animations) method_state["method"] = arg elif method_state["method"] is not None: method_state["args"].append(arg) else: raise Exception("Invalid play arguments") compile_method(method_state, animations) return animations def play(self, *args, **kwargs): if len(args) == 0: raise Exception("Called Scene.play with no animations") if self.skip_animations: kwargs["run_time"] = 0 animations = self.compile_play_args_to_animation_list(*args) self.num_plays += 1 animations = self.align_run_times(*animations, **kwargs) moving_mobjects, static_mobjects = \ self.separate_moving_and_static_mobjects(*animations) self.update_frame(static_mobjects) static_image = self.get_frame() for t in self.get_time_progression(animations): for animation in animations: animation.update(t / animation.run_time) self.update_frame(moving_mobjects, static_image) self.frames.append(self.get_frame()) self.clean_up_animations(*animations) return self def clean_up_animations(self, *animations): self.mobjects_from_last_animation = [] for animation in animations: animation.clean_up() if animation.is_remover(): self.remove(animation.mobject) else: self.add(animation.mobject) self.mobjects_from_last_animation.append(animation.mobject) return self def get_mobjects_from_last_animation(self): if hasattr(self, "mobjects_from_last_animation"): return self.mobjects_from_last_animation return [] def play_over_time_range(self, t0, t1, *animations): needed_scene_time = max(abs(t0), abs(t1)) existing_scene_time = len(self.frames)*self.frame_duration if existing_scene_time < needed_scene_time: self.dither(needed_scene_time - existing_scene_time) existing_scene_time = needed_scene_time #So negative values may be used if t0 < 0: t0 = float(t0)%existing_scene_time if t1 < 0: t1 = float(t1)%existing_scene_time t0, t1 = min(t0, t1), max(t0, t1) moving_mobjects, static_mobjects = \ self.separate_moving_and_static_mobjects(*animations) for t in np.arange(t0, t1, self.frame_duration): for animation in animations: animation.update((t-t0)/(t1 - t0)) index = int(t/self.frame_duration) self.update_frame(moving_mobjects, self.frames[index]) self.frames[index] = self.get_frame() for animation in animations: animation.clean_up() return self def dither(self, duration = DEFAULT_DITHER_TIME): if self.skip_animations: return self self.update_frame() self.frames += [self.get_frame()]*int(duration / self.frame_duration) return self def repeat_frames(self, num): self.frames = self.frames*num return self def reverse_frames(self): self.frames.reverse() return self def invert_colors(self): white_frame = 255*np.ones(self.get_frame().shape, dtype = 'uint8') self.frames = [ white_frame-frame for frame in self.frames ] return self def show_frame(self): self.update_frame() Image.fromarray(self.get_frame()).show() def preview(self): TkSceneRoot(self) def save_image(self, directory = MOVIE_DIR, name = None): path = os.path.join(directory, "images") file_name = (name or str(self)) + ".png" full_path = os.path.join(path, file_name) if not os.path.exists(path): os.makedirs(path) Image.fromarray(self.get_frame()).save(full_path) def get_movie_file_path(self, name, extension): file_path = os.path.join(MOVIE_DIR, name) if not file_path.endswith(extension): file_path += extension directory = os.path.split(file_path)[0] if not os.path.exists(directory): os.makedirs(directory) return file_path def write_to_movie(self, name = None): if len(self.frames) == 0: print "No frames, so I'm not writing anything" return if name is None: name = str(self) file_path = self.get_movie_file_path(name, ".mp4") print "Writing to %s"%file_path fps = int(1/self.frame_duration) height, width = self.camera.pixel_shape command = [ FFMPEG_BIN, '-y', # overwrite output file if it exists '-f', 'rawvideo', '-vcodec','rawvideo', '-s', '%dx%d'%(width, height), # size of one frame '-pix_fmt', 'rgb24', '-r', str(fps), # frames per second '-i', '-', # The imput comes from a pipe '-an', # Tells FFMPEG not to expect any audio '-vcodec', 'mpeg', '-c:v', 'libx264', '-pix_fmt', 'yuv420p', '-loglevel', 'error', file_path, ] process = sp.Popen(command, stdin=sp.PIPE) for frame in self.frames: process.stdin.write(frame.tostring()) process.stdin.close() process.wait() # To list possible args that subclasses have # Elements should always be a tuple args_list = [] # For subclasses to turn args in the above # list into stings which can be appended to the name @staticmethod def args_to_string(*args): return "" @staticmethod def string_to_args(string): raise Exception("string_to_args Not Implemented!")