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Incremental progress on animations for Winding Number video

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This commit is contained in:
Sridhar Ramesh
2018-01-11 17:04:10 -08:00
parent 1500666871
commit 943a970d12
1 changed files with 59 additions and 5 deletions
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64
active_projects/WindingNumber.py
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@ -29,6 +29,62 @@ from mobject.svg_mobject import *
from mobject.tex_mobject import *
from topics.graph_scene import *
class DualScene(Scene):
CONFIG = {
"num_needed_anchor_points" : 10
}
def setup(self):
split_line = DashedLine(SPACE_HEIGHT * UP, SPACE_HEIGHT * DOWN)
self.num_plane = NumberPlane(x_radius = SPACE_WIDTH/2)
self.num_plane.to_edge(LEFT, buff = 0)
self.num_plane.prepare_for_nonlinear_transform()
self.add(self.num_plane, split_line)
def apply_function(self, func, run_time = 3):
self.func = func
right_plane = self.num_plane.copy()
right_plane.center()
right_plane.prepare_for_nonlinear_transform()
right_plane.apply_function(func)
right_plane.shift(SPACE_WIDTH/2 * RIGHT)
self.right_plane = right_plane
crappy_cropper = FullScreenFadeRectangle(fill_opacity = 1)
crappy_cropper.stretch_to_fit_width(SPACE_WIDTH)
crappy_cropper.to_edge(LEFT, buff = 0)
self.play(
ReplacementTransform(self.num_plane.copy(), right_plane),
FadeIn(crappy_cropper),
Animation(self.num_plane),
run_time = run_time
)
def squash_onto_left(self, object):
object.shift(SPACE_WIDTH/2 * LEFT)
def squash_onto_right(self, object):
object.shift(SPACE_WIDTH/2 * RIGHT)
def path_draw(self, input_object, run_time = 3):
output_object = input_object.copy()
if input_object.get_num_anchor_points() < self.num_needed_anchor_points:
input_object.insert_n_anchor_points(self.num_needed_anchor_points)
output_object.apply_function(self.func)
self.squash_onto_left(input_object)
self.squash_onto_right(output_object)
self.play(
ShowCreation(input_object),
ShowCreation(output_object),
run_time = run_time
)
class TestDual(DualScene):
def construct(self):
self.force_skipping()
self.apply_function(lambda (x, y, z) : complex_to_R3(complex(x,y)**2))
self.revert_to_original_skipping_status()
self.path_draw(Line(LEFT + DOWN, RIGHT + DOWN))
class EquationSolver1d(GraphScene, ZoomedScene, ReconfigurableScene):
CONFIG = {
"graph_func" : lambda x : x,
@ -284,7 +340,8 @@ class LoopSplitScene(Scene):
loop_color = BLUE
default_bullet = TexMobject("*", stroke_color = RED, stroke_width = 1)
default_bullet = PiCreature(color = RED)
default_bullet.scale(0.15)
def SGroup(*args):
return VGroup(*[arg[0] for arg in args])
@ -315,7 +372,6 @@ class LoopSplitScene(Scene):
# Splits in middle
split_line = DashedLine(interpolate(tl, tr, 0.5), interpolate(bl, br, 0.5))
self.play(ShowCreation(split_line))
self.dither()
self.remove(*split_line)
mid_line_left = self.PulsedLine(tm, bm, default_bullet, color = loop_color)
@ -341,8 +397,6 @@ class LoopSplitScene(Scene):
right_open_loop = SGroup(top_line_right_half, right_line, bottom_line_right_half)
right_closed_loop = VGroup(right_open_loop, mid_line_right[0])
self.dither()
self.play(
ApplyMethod(left_closed_loop.shift, LEFT),
ApplyMethod(right_closed_loop.shift, RIGHT)
@ -359,7 +413,7 @@ class LoopSplitScene(Scene):
mid_lines = SGroup(mid_line_left, mid_line_right)
highlight_circle = Circle(color = YELLOW_A) # Perhaps make this a dashed circle?
highlight_circle = Circle(color = YELLOW_E) # Perhaps make this a dashed circle?
highlight_circle.surround(mid_lines)
self.play(Indicate(mid_lines), ShowCreation(highlight_circle, run_time = 0.5))