def zoom_out(self, board=Mobject()):
def zoom_out(mob):
mob.scale(1/3)
mob.to_corner(UL)
return mob
self.play(
LaggedStart(
ApplyFunction(zoom_out, board),
AnimationGroup(
*[FadeInFrom(student) for student in self.students],
FadeInFrom(self.teacher, RIGHT),
),
lag_ratio = 0.1,
run_time=2
),
)
def test_succession_in_succession_timing():
"""Test timing of nested successions."""
line = Line()
animation_1s = FadeInFrom(line, direction=DOWN, run_time=1.0)
animation_4s = FadeOutAndShift(line, direction=DOWN, run_time=4.0)
nested_succession = Succession(animation_1s, animation_4s)
succession = Succession(
FadeInFrom(line, direction=DOWN, run_time=4.0),
nested_succession,
FadeInFrom(line, direction=DOWN, run_time=1.0),
)
assert nested_succession.get_run_time() == 5.0
assert succession.get_run_time() == 10.0
succession.begin()
succession.interpolate(0.1)
assert succession.active_index == 0
# The nested succession must not be active yet, and as a result hasn't set active_animation yet.
assert not hasattr(nested_succession, "active_animation")
succession.interpolate(0.39)
assert succession.active_index == 0
assert not hasattr(nested_succession, "active_animation")
# The nested succession starts at 40% of total run time
succession.interpolate(0.4)
assert succession.active_index == 1
assert nested_succession.active_index == 0
# The nested succession second animation starts at 50% of total run time.
succession.interpolate(0.49)
assert succession.active_index == 1
assert nested_succession.active_index == 0
succession.interpolate(0.5)
assert succession.active_index == 1
assert nested_succession.active_index == 1
# The last animation starts at 90% of total run time. The nested succession must be finished at that time.
succession.interpolate(0.89)
assert succession.active_index == 1
assert nested_succession.active_index == 1
succession.interpolate(0.9)
assert succession.active_index == 2
assert nested_succession.active_index == 2
assert nested_succession.active_animation is None
# After 100%, nothing must be playing anymore.
succession.interpolate(1.0)
assert succession.active_index == 3
assert succession.active_animation is None
assert nested_succession.active_index == 2
assert nested_succession.active_animation is None
def create_arrows(self, created):
all_anims = []
overlay_objs = []
for (id1, (p11, p12), (d1x, d1y)), (id2, (p21, p22), (d2x, d2y)) in created:
self.arrow_blocks[id1] = self._create_arrow(
[((p11[0] + p12[0])/2 + 0.5) * self.scale, ((p11[1] + p12[1])/2 + 0.5) * self.scale, 0],
[d1x, d1y],
)
self.arrow_blocks[id2] = self._create_arrow(
[((p21[0] + p22[0])/2 + 0.5) * self.scale, ((p21[1] + p22[1])/2 + 0.5) * self.scale, 0],
[d2x, d2y],
)
overlay_objs.extend([self.arrow_blocks[id1], self.arrow_blocks[id2]])
if self.ARROW_OVERLAY_COLOUR is not None:
top = max(self.arrow_blocks[id1].get_top()[1], self.arrow_blocks[id2].get_top()[1])
right = max(self.arrow_blocks[id1].get_right()[0], self.arrow_blocks[id2].get_right()[0])
fade_square = Square(side_length=self.scale * 2, color=self.ARROW_OVERLAY_COLOUR)
fade_square.set_opacity(self.ARROW_OVERLAY_STARTING_ALPHA)
fade_square.move_to([right - self.scale, top - self.scale, 0])
overlay_objs.append(fade_square)
if self.ARROW_CREATE_RUNTIME > 0:
anims = []
if self.ARROW_OVERLAY_COLOUR is not None:
anims.append(FadeOut(fade_square))
if self.ARROW_CREATE_ANIM is not None:
if self.ARROW_CREATE_ANIM == FadeInFrom:
anims.append(FadeInFrom(self.arrow_blocks[id1], direction=[-d1x * self.scale, -d1y * self.scale, 0]))
anims.append(FadeInFrom(self.arrow_blocks[id2], direction=[-d2x * self.scale, -d2y * self.scale, 0]))
else:
anims.append(self.ARROW_CREATE_ANIM(self.arrow_blocks[id1]))
anims.append(self.ARROW_CREATE_ANIM(self.arrow_blocks[id2]))
else:
# This adds them to the scene.
anims.append(Transform(self.arrow_blocks[id1], self.arrow_blocks[id1]))
anims.append(Transform(self.arrow_blocks[id2], self.arrow_blocks[id2]))
all_anims.append(AnimationGroup(*anims))
if self.ARROW_CREATE_RUNTIME > 0 and len(all_anims) > 0:
return overlay_objs, LaggedStart(*all_anims, lag_ratio=self.ARROW_LAG_RATIO)
return overlay_objs, None
def test_succession_timing():
"""Test timing of animations in a succession."""
line = Line()
animation_1s = FadeInFrom(line, direction=DOWN, run_time=1.0)
animation_4s = FadeOutAndShift(line, direction=DOWN, run_time=4.0)
succession = Succession(animation_1s, animation_4s)
assert succession.get_run_time() == 5.0
succession.begin()
assert succession.active_index == 0
# The first animation takes 20% of the total run time.
succession.interpolate(0.199)
assert succession.active_index == 0
succession.interpolate(0.2)
assert succession.active_index == 1
succession.interpolate(0.8)
assert succession.active_index == 1
# At 100% and more, no animation must be active anymore.
succession.interpolate(1.0)
assert succession.active_index == 2
assert succession.active_animation is None
succession.interpolate(1.2)
assert succession.active_index == 2
assert succession.active_animation is None