Starting complex number animations

animation/transform.py

@@ -30,6 +30,15 @@ def clockwise_path(start_points, end_points, alpha):
 def counterclockwise_path(start_points, end_points, alpha):
     return semi_circular_path(start_points, end_points, alpha, OUT)
 
+def get_best_interpolation_function(angle):
+    angle = (angle + np.pi)%(2*np.pi) - np.pi
+    if abs(angle) < np.pi/2:
+        return straight_path
+    elif angle > 0:
+        return counterclockwise_path
+    else:
+        return clockwise_path
+
 class Transform(Animation):
     DEFAULT_CONFIG = {
         "run_time" : DEFAULT_TRANSFORM_RUN_TIME,

constants.py

@@ -60,7 +60,7 @@ TEX_IMAGE_DIR = os.path.join(IMAGE_DIR, "Tex")
 MOBJECT_DIR = os.path.join(FILE_DIR, "mobjects")
 IMAGE_MOBJECT_DIR = os.path.join(MOBJECT_DIR, "image")
 
-for folder in [IMAGE_DIR, GIF_DIR, MOVIE_DIR, TEX_DIR, TMP_IMAGE_DIR, 
+for folder in [IMAGE_DIR, GIF_DIR, MOVIE_DIR, TEX_DIR, 
                TEX_IMAGE_DIR, MOBJECT_DIR, IMAGE_MOBJECT_DIR]:
     if not os.path.exists(folder):
         os.mkdir(folder)

displayer.py

@@ -49,49 +49,58 @@ def paint_mobjects(mobjects, image_array = None):
     for mobject in mobjects:
         if mobject.get_num_points() == 0:
             continue
-        points, rgbs = place_on_screen(mobject.points, mobject.rgbs, 
-                                       space_width, space_height)
+        points_and_rgbs = np.append(
+            mobject.points,
+            255*mobject.rgbs,
+            axis = 1
+        )
+        points_and_rgbs = place_on_screen(
+            points_and_rgbs,
+            space_width, space_height
+        )
         #Map points to pixel space, which requires rescaling and shifting
         #Remember, 2*space_height -> height
-        points[:,0] = points[:,0]*width/space_width/2 + width/2
+        points_and_rgbs[:,0] = points_and_rgbs[:,0]*width/space_width/2 + width/2
         #Flip on y-axis as you go
-        points[:,1] = -1*points[:,1]*height/space_height/2 + height/2
-        points, rgbs = add_thickness(
-            points.astype('int'), rgbs, 
+        points_and_rgbs[:,1] = -1*points_and_rgbs[:,1]*height/space_height/2 + height/2
+        points_and_rgbs = add_thickness(
+            points_and_rgbs.astype('int'),
             mobject.point_thickness,
             width, height
         )
 
+        points, rgbs = points_and_rgbs[:,:2], points_and_rgbs[:,2:]
         flattener = np.array([[1], [width]], dtype = 'int')
         indices = np.dot(points, flattener)[:,0]
-        pixels[indices] = (255*rgbs).astype('uint8')
+        pixels[indices] = rgbs.astype('uint8')
 
     pixels = pixels.reshape((height, width, 3)).astype('uint8')
     return pixels
 
-def add_thickness(pixel_indices, rgbs, thickness, width, height):
+def add_thickness(pixel_indices_and_rgbs, thickness, width, height):
     """
     Imagine dragging each pixel around like a paintbrush in
-    a plus-sign-shaped pixel arrangement surrounding it
+    a plus-sign-shaped pixel arrangement surrounding it.
+
+    Pass rgb = None to do nothing to them
     """
     thickness = adjusted_thickness(thickness, width, height)
-    original = np.array(pixel_indices)
-    original_rgbs = np.array(rgbs)
+    original = np.array(pixel_indices_and_rgbs)
+    n_extra_columns = pixel_indices_and_rgbs.shape[1] - 2
     for nudge in range(-thickness/2+1, thickness/2+1):
         if nudge == 0:
             continue
         for x, y in [[nudge, 0], [0, nudge]]:
-            pixel_indices = np.append(
-                pixel_indices, 
-                original+[x, y], 
+            pixel_indices_and_rgbs = np.append(
+                pixel_indices_and_rgbs, 
+                original+([x, y] + [0]*n_extra_columns),
                 axis = 0
             )
-            rgbs = np.append(rgbs, original_rgbs, axis = 0)
-    admissibles = (pixel_indices[:,0] >= 0) & \
-                  (pixel_indices[:,0] < width) & \
-                  (pixel_indices[:,1] >= 0) & \
-                  (pixel_indices[:,1] < height)
-    return pixel_indices[admissibles], rgbs[admissibles]
+    admissibles = (pixel_indices_and_rgbs[:,0] >= 0) & \
+                  (pixel_indices_and_rgbs[:,0] < width) & \
+                  (pixel_indices_and_rgbs[:,1] >= 0) & \
+                  (pixel_indices_and_rgbs[:,1] < height)
+    return pixel_indices_and_rgbs[admissibles]
 
 def adjusted_thickness(thickness, width, height):
     big_width = PRODUCTION_QUALITY_DISPLAY_CONFIG["width"]
@@ -99,38 +108,50 @@ def adjusted_thickness(thickness, width, height):
     factor = (big_width + big_height) / (width + height)
     return 1 + (thickness-1)/factor
 
-def place_on_screen(points, rgbs, space_width, space_height):
+def place_on_screen(points_and_rgbs, space_width, space_height):
     """
     Projects points to 2d space and remove those outside a
-    the space constraints
+    the space constraints.
+
+    Pass rbgs = None to do nothing to them.
     """
-    # camera_distance = 10
-    points = np.array(points[:, :2])
-    # for i in range(2):
-    #     points[:,i] *= camera_distance/(camera_distance-mobject.points[:,2])
-    rgbs   = np.array(rgbs)
+    # Remove 3rd column
+    points_and_rgbs = np.append(
+        points_and_rgbs[:, :2], 
+        points_and_rgbs[:, 3:], 
+        axis = 1
+    )
     
     #Removes points out of space
-    to_keep = (abs(points[:,0]) < space_width) & \
-              (abs(points[:,1]) < space_height)
-    return points[to_keep], rgbs[to_keep]
+    to_keep = (abs(points_and_rgbs[:,0]) < space_width) & \
+              (abs(points_and_rgbs[:,1]) < space_height)
+    return points_and_rgbs[to_keep]
+
+def get_file_path(name, extension):
+    file_path = os.path.join(MOVIE_DIR, name)
+    if not file_path.endswith(".mp4"):
+        file_path += ".mp4"
+    directory = os.path.split(file_path)[0]
+    if not os.path.exists(directory):
+        os.makedirs(directory)
+    return file_path
 
 def write_to_gif(scene, name):
     #TODO, find better means of compression
     if not name.endswith(".gif"):
         name += ".gif"
-    filepath = os.path.join(GIF_DIR, name)
+    file_path = os.path.join(GIF_DIR, name)
     temppath = os.path.join(GIF_DIR, "Temp.gif")
     print "Writing " + name + "..."
     images = [Image.fromarray(frame) for frame in scene.frames]
     writeGif(temppath, images, scene.frame_duration)
     print "Compressing..."
-    os.system("gifsicle -O " + temppath + " > " + filepath)
+    os.system("gifsicle -O " + temppath + " > " + file_path)
     os.system("rm " + temppath)
 
 def write_to_movie(scene, name):
-    filepath = os.path.join(MOVIE_DIR, name) + ".mp4"    
-    print "Writing to %s"%filepath
+    file_path = get_file_path(name, ".mp4")
+    print "Writing to %s"%file_path
 
     fps = int(1/scene.display_config["frame_duration"])
     dim = (scene.display_config["width"], scene.display_config["height"])
@@ -149,12 +170,11 @@ def write_to_movie(scene, name):
         '-c:v', 'libx264',
         '-pix_fmt', 'yuv420p',
         '-loglevel', 'error',
-        filepath,
+        file_path,
     ]
     process = sp.Popen(command, stdin=sp.PIPE)
     for frame in scene.frames:
         process.stdin.write(frame.tostring())
-
     process.stdin.close()
     process.wait()
 

mobject/function_graphs.py

@@ -2,6 +2,7 @@ import numpy as np
 import itertools as it
 
 from mobject import Mobject, Mobject1D, Mobject2D, CompoundMobject
+from simple_mobjects import Arrow, Line
 from image_mobject import tex_mobject
 from constants import *
 from helpers import *
@@ -255,9 +256,65 @@ class NumberPlane(Mobject1D):
         self.add(*self.get_coordinate_labels(x_vals, y_vals))
         return self
 
+    def get_vector(self, coords, **kwargs):
+        if len(coords) == 2:
+            coords = tuple(list(coords) + [0])
+        arrow = Arrow(ORIGIN, coords, **kwargs)
+        arrow.remove_tip()
+        arrow.align_data(Line(ORIGIN, SPACE_WIDTH*LEFT))
+        arrow.add_tip()
+        return arrow
+
 class ComplexPlane(NumberPlane):
-    #TODO
-    pass
+    DEFAULT_CONFIG = {
+        "color" : "lightgreen",
+        "unit_to_spatial_width" : 1,
+        "line_frequency" : 1,
+        "faded_line_frequency" : 0.5,
+        "number_at_center" : complex(0),
+    }
+    def __init__(self, **kwargs):
+        digest_config(self, ComplexPlane, kwargs)
+        kwargs.update({
+            "x_unit_to_spatial_width" : self.unit_to_spatial_width,
+            "y_uint_to_spatial_height" : self.unit_to_spatial_width,
+            "x_line_frequency" : self.line_frequency,
+            "x_faded_line_frequency" : self.faded_line_frequency,
+            "y_line_frequency" : self.line_frequency,
+            "y_faded_line_frequency" : self.faded_line_frequency,
+            "num_pair_at_center" : (self.number_at_center.real, self.number_at_center.imag),
+        })
+        NumberPlane.__init__(self, **kwargs)
+
+    def number_to_point(self, number):
+        number = complex(number)
+        return self.num_pair_to_point((number.real, number.imag))
+
+    def get_coordinate_labels(self, *numbers):
+        result = []
+        nudge = 0.1*(DOWN+RIGHT)
+        if len(numbers) == 0:
+            numbers = range(-int(self.x_radius), int(self.x_radius))
+            numbers += [
+                complex(0, y)
+                for y in range(-int(self.y_radius), int(self.y_radius))
+            ]
+        for number in numbers:
+            point = self.number_to_point(number)
+            if number == 0:
+                num_str = "0"
+            else:
+                num_str = str(number).replace("j", "i")
+            num = tex_mobject(num_str)
+            num.scale(self.number_scale_factor)
+            num.shift(point-num.get_corner(UP+LEFT)+nudge)
+            result.append(num)
+        return result
+
+    def add_coordinates(self, *numbers):
+        self.add(*self.get_coordinate_labels(*numbers))
+        return self
+
 
 
 

mobject/mobject.py

@@ -321,18 +321,17 @@ class Mobject(object):
         #Typically implemented in subclass, unless purposefully left blank
         pass
 
-    ### Static Methods ###
-    def align_data(mobject1, mobject2):
-        count1, count2 = mobject1.get_num_points(), mobject2.get_num_points()
+    def align_data(self, mobject):
+        count1, count2 = self.get_num_points(), mobject.get_num_points()
         if count1 == 0:
-            mobject1.add_points([(0, 0, 0)])
+            self.add_points([(0, 0, 0)])
         if count2 == 0:
-            mobject2.add_points([(0, 0, 0)])
+            mobject.add_points([(0, 0, 0)])
         if count1 == count2:
             return
         for attr in ['points', 'rgbs']:
-            new_arrays = make_even(getattr(mobject1, attr), getattr(mobject2, attr))
-            for array, mobject in zip(new_arrays, [mobject1, mobject2]):
+            new_arrays = make_even(getattr(self, attr), getattr(mobject, attr))
+            for array, mobject in zip(new_arrays, [self, mobject]):
                 setattr(mobject, attr, np.array(array))
 
     def interpolate(mobject1, mobject2, target_mobject, alpha):
@@ -342,9 +341,10 @@ class Mobject(object):
         """
         Mobject.align_data(mobject1, mobject2)
         for attr in ['points', 'rgbs']:
-            new_array = (1 - alpha) * getattr(mobject1, attr) + \
-                              alpha * getattr(mobject2, attr)
-            setattr(target_mobject, attr, new_array)
+            setattr(target_mobject, attr, interpolate(
+                getattr(mobject1, attr), 
+                getattr(mobject2, attr), 
+            alpha))
 
 #TODO, Make the two implementations bellow not redundant
 class Mobject1D(Mobject):

sample_script.py

@@ -16,9 +16,10 @@ from script_wrapper import command_line_create_scene
 
 class SampleScene(Scene):
     def construct(self):
-        circle = Circle().repeat(6)
-        self.play(Transform(circle, Square(), run_time = 3))
-        self.dither()
+        c = ComplexPlane().add_coordinates()
+
+        self.add_local_mobjects()
+
 
 
 if __name__ == "__main__":

scene/scene.py

@@ -62,6 +62,8 @@ class Scene(object):
         in the order with which they are entered.
         """
         for mobject in mobjects:
+            if not isinstance(mobject, Mobject):
+                raise Exception("Adding something which is not a mobject")
             #In case it's already in there, it should 
             #now be closer to the foreground.
             self.remove(mobject)
@@ -86,6 +88,15 @@ class Scene(object):
                 self.mobjects.remove(mobject)
         return self
 
+    def bring_to_front(self, mobject):
+        self.add(mobject)
+        return self
+
+    def bring_to_back(self, mobject):
+        self.remove(mobject)
+        self.mobjects = [mobject] + self.mobjects
+        return self
+
     def clear(self):
         self.reset_background()
         self.remove(*self.mobjects)
@@ -174,11 +185,8 @@ class Scene(object):
             animation.clean_up()
         return self
 
-    def apply(self, mob_to_anim_func, **kwargs):
-        self.play(*[
-            mob_to_anim_func(mobject)
-            for mobject in self.mobjects
-        ])
+    def apply(self, mobject_method, *args, **kwargs):
+        self.play(ApplyMethod(mobject_method, *args, **kwargs))
 
     def get_frame(self):
         return disp.paint_mobjects(self.mobjects, self.background)

scene/tk_scene.py

@@ -7,7 +7,7 @@ import time
 class TkSceneRoot(Tkinter.Tk):
     def __init__(self, scene):
         if scene.frames == []:
-            raise str(scene) + " has no frames!"
+            raise Exception(str(scene) + " has no frames!")
         Tkinter.Tk.__init__(self)
 
         height, width = scene.shape

script_wrapper.py

@@ -66,7 +66,7 @@ def get_configuration(sys_argv):
    if len(args) > 0:
       config["scene_name"] = args[0]
    if len(args) > 1:
-      config["args_extension"] = args[1]
+      config["args_extension"] = " ".join(args[1:])
    return config
 
 def handle_scene(scene, **config):
@@ -128,13 +128,13 @@ def command_line_create_scene(movie_prefix = ""):
       "announce_construction" : True
    }
    for SceneClass in scene_classes:
-      args_list = SceneClass.args_list or [()]
+      args_list = SceneClass.args_list
       preset_extensions = [
          SceneClass.args_to_string(*args)
          for args in args_list
       ]
       if config["write_all"]:
-         args_to_run = args_list
+         args_to_run = args_list or [()]
       elif config["args_extension"] in preset_extensions:
          index = preset_extensions.index(config["args_extension"])
          args_to_run = [args_list[index]]

scripts/complex_actions.py

@@ -0,0 +1,157 @@
+#!/usr/bin/env python
+
+import numpy as np
+import itertools as it
+from copy import deepcopy
+import sys
+
+
+from animation import *
+from mobject import *
+from constants import *
+from region import *
+from scene import Scene
+from script_wrapper import command_line_create_scene
+
+MOVIE_PREFIX = "complex_actions/"
+
+class ComplexMultiplication(Scene):
+    @staticmethod
+    def args_to_string(multiplier):
+        return filter(lambda c : c not in "()", str(multiplier))
+
+    @staticmethod
+    def string_to_args(num_string):
+        return complex(num_string)
+
+    def construct(self, multiplier):
+        norm = np.linalg.norm(multiplier)
+        arg  = np.log(multiplier).imag
+        plane_config = {
+            "faded_line_frequency" : 0
+        }
+        if norm > 1:
+            plane_config["density"] = norm*DEFAULT_POINT_DENSITY_1D
+        radius = SPACE_WIDTH
+        if norm > 0 and norm < 1:
+            radius /= norm
+        plane_config["x_radius"] = plane_config["y_radius"] = radius
+        plane = ComplexPlane(**plane_config)
+        self.anim_config = {
+            "run_time" : 2.0,
+            "interpolation_function" : get_best_interpolation_function(arg)
+        }
+
+        background = ComplexPlane(color = "grey")            
+        labels = background.get_coordinate_labels()
+        self.paint_into_background(background, *labels)
+        arrow, new_arrow = [
+            plane.get_vector(plane.number_to_point(z), color = "skyblue")
+            for z in [1, multiplier]
+        ]
+        self.add(arrow)
+        self.additional_animations = [Transform(
+            arrow, new_arrow, **self.anim_config
+        )]
+
+        self.mobjects_to_multiply = [plane]
+        self.mobjects_to_move_without_molding = []
+        self.multiplier = multiplier
+        self.plane = plane
+        if self.__class__ == ComplexMultiplication:
+            self.apply_multiplication()
+
+    def apply_multiplication(self):
+        def func((x, y, z)):
+            complex_num = self.multiplier*complex(x, y)
+            return (complex_num.real, complex_num.imag, z)
+        mobjects = self.mobjects_to_multiply+self.mobjects_to_move_without_molding
+        mobjects += [anim.mobject for anim in self.additional_animations]
+        self.add(*mobjects)
+        full_multiplications = [
+            ApplyMethod(mobject.apply_function, func, **self.anim_config)
+            for mobject in self.mobjects_to_multiply
+        ]
+        movements_with_plane = [
+            ApplyMethod(
+                mobject.shift, 
+                func(mobject.get_center())-mobject.get_center(),
+                **self.anim_config            
+            )
+            for mobject in self.mobjects_to_move_without_molding
+        ]
+        self.dither()
+        self.play(*reduce(op.add, [
+            full_multiplications,
+            movements_with_plane,
+            self.additional_animations
+        ]))
+        self.dither()
+
+class MultiplicationWithDot(ComplexMultiplication):
+    @staticmethod
+    def args_to_string(multiplier, dot_coords):
+        start = ComplexMultiplication.args_to_string(multiplier)
+        return start + "WithDotAt%d-%d"%dot_coords[:2]
+
+    @staticmethod
+    def string_to_args(arg_string):
+        parts = arg_string.split()
+        if len(parts) < 2 or len(parts) > 3:
+            raise Exception("Invalid arguments")
+        multiplier = complex(parts[0])
+        tup_string = filter(lambda c : c not in "()", parts[1])
+        nums = tuple(map(int, tup_string.split(",")))[:2]
+        return multiplier, nums
+
+    def construct(self, multiplier, dot_coords):
+        ComplexMultiplication.construct(self, multiplier)
+        self.mobjects_to_move_without_molding.append(
+            Dot().shift(dot_coords)
+        )
+        self.apply_multiplication()
+
+
+class ShowComplexPower(ComplexMultiplication):
+    @staticmethod
+    def args_to_string(multiplier, num_repeats):
+        start = ComplexMultiplication.args_to_string(multiplier)
+        return start + "ToThe%d"%num_repeats
+
+    @staticmethod
+    def string_to_args(arg_string):
+        parts = arg_string.split()
+        if len(parts) < 2 or len(parts) > 3:
+            raise Exception("Invalid arguments")
+        multiplier = complex(parts[0])
+        num_repeats = int(parts[1])
+        return multiplier, num_repeats
+
+    def construct(self, multiplier, num_repeats):
+        ComplexMultiplication.construct(self, multiplier)
+        for x in range(num_repeats):
+            arrow_transform = Transform(*[
+                self.plane.get_vector(point, color = "skyblue")
+                for z in [multiplier**(x), multiplier**(x+1)]
+                for point in [self.plane.number_to_point(z)]
+            ], **self.anim_config)
+            self.remove(*[anim.mobject for anim in self.additional_animations])
+            self.additional_animations = [arrow_transform]
+            self.apply_multiplication()
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+if __name__ == "__main__":
+    command_line_create_scene(MOVIE_PREFIX)

scripts/matrix_as_transform_2d.py

@@ -224,7 +224,6 @@ class ShowMatrixTransform(TransformScene2D):
             self.add_x_y_arrows()
         else:
             self.add_number_plane(**number_plane_config)
-        self.save_image()
         if show_matrix:
             self.add(matrix_mobject(matrix).to_corner(UP+LEFT))
         def func(mobject):