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Pond now smoothly morphs into a number line

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Ben Hambrecht 2018-02-20 15:37:19 +01:00
parent 88dfb772f6
commit 2d93c45624
1 changed files with 73 additions and 10 deletions
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83
active_projects/basel.py
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@ -2329,10 +2329,21 @@ class PondScene(Scene):
self.add(ls2)
self.additional_light_sources.append(ls2)
self.play(
ApplyMethod(ls1.move_source_to,ls_new_loc1, run_time = run_time),
ApplyMethod(ls2.move_source_to,ls_new_loc2, run_time = run_time),
)
# check if the light sources are on screen
ls_old_loc = np.array(ls1.get_source_point())
onscreen_old = np.all(np.abs(ls_old_loc) < 10)
onscreen_1 = np.all(np.abs(ls_new_loc1) < 10)
onscreen_2 = np.all(np.abs(ls_new_loc2) < 10)
show_animation = (onscreen_old or onscreen_1 or onscreen_2)
if show_animation:
self.play(
ApplyMethod(ls1.move_source_to,ls_new_loc1, run_time = run_time),
ApplyMethod(ls2.move_source_to,ls_new_loc2, run_time = run_time),
)
else:
ls1.move_source_to(ls_new_loc1)
ls2.move_source_to(ls_new_loc1)
@ -2511,18 +2522,70 @@ class PondScene(Scene):
FadeOut(self.legs)
)
for i in range(3,10):
for i in range(3,5):
construction_step(i, scale_down = False, show_steps = False, run_time = 1.0/2**i,
simultaneous_splitting = True)
# Now create a straight number line and transform into it
MAX_N = 17
self.number_line = NumberLine(
x_min = -MAX_N,
x_max = MAX_N + 1,
color = WHITE,
number_at_center = 0,
stroke_width = LAKE_STROKE_WIDTH,
stroke_color = LAKE_STROKE_COLOR,
numbers_with_elongated_ticks = range(-MAX_N,MAX_N + 1),
numbers_to_show = range(-MAX_N,MAX_N + 1),
unit_size = LAKE0_RADIUS * TAU/4 / 4,
tick_frequency = 1,
line_to_number_buff = LARGE_BUFF,
label_direction = UP,
).shift(2.5 * DOWN)
self.number_line.label_direction = DOWN
self.number_line_labels = self.number_line.get_number_mobjects()
self.wait()
origin_point = self.number_line.number_to_point(0)
nl_sources = VMobject()
pond_sources = VMobject()
for i in range(-MAX_N,MAX_N+1):
anchor = self.number_line.number_to_point(2*i + 1)
ls = self.light_sources_array[i].copy()
ls.move_source_to(anchor)
nl_sources.add(ls)
pond_sources.add(self.light_sources_array[i].copy())
self.add(pond_sources)
self.remove(self.light_sources)
self.outer_lake.rotate(TAU/8)
# open sea
open_sea = Rectangle(
width = 20,
height = 10,
stroke_width = LAKE_STROKE_WIDTH,
stroke_color = LAKE_STROKE_COLOR,
fill_color = LAKE_COLOR,
fill_opacity = LAKE_OPACITY,
).flip().next_to(origin_point,UP,buff = 0)
self.play(
Transform(pond_sources,nl_sources),
Transform(self.outer_lake,open_sea),
FadeOut(self.inner_lake)
)
self.play(FadeIn(self.number_line))