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Reimplement Animation.get_sub_alpha based on lag_ratio

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This commit is contained in:
Grant Sanderson 2019-02-08 15:38:02 -08:00
parent a2d99741f3
commit f5bf0b39b0
1 changed files with 20 additions and 14 deletions
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34
manimlib/animation/animation.py
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@ -16,7 +16,15 @@ class Animation(object):
# Does this animation add or remove a mobject form the screen
"remover": False,
# TODO, replace this with a single lag parameter
"submobject_mode": "all_at_once",
# "submobject_mode": "all_at_once",
# If 0, the animation is applied to all submobjects
# at the same time
# If 1, it is applied to each successively.
# If 0 < lag_ratio < 1, its applied to each
# with lagged start times
"lag_ratio": 0,
# TODO, remove anything with lag_factor
"lag_factor": 2,
}
@ -91,19 +99,17 @@ class Animation(object):
pass
def get_sub_alpha(self, alpha, index, num_submobjects):
if self.submobject_mode in ["lagged_start", "smoothed_lagged_start"]:
prop = float(index) / num_submobjects
if self.submobject_mode is "smoothed_lagged_start":
prop = smooth(prop)
lf = self.lag_factor
return np.clip(lf * alpha - (lf - 1) * prop, 0, 1)
elif self.submobject_mode == "one_at_a_time":
lower = float(index) / num_submobjects
upper = float(index + 1) / num_submobjects
return np.clip((alpha - lower) / (upper - lower), 0, 1)
elif self.submobject_mode == "all_at_once":
return alpha
raise Exception("Invalid submobject mode")
# TODO, make this more understanable, and/or combine
# its functionality with AnimationGroup's method
# build_animations_with_timings
lag_ratio = self.lag_ratio
full_length = (num_submobjects - 1) * lag_ratio + 1
value = alpha * full_length
lower = index * lag_ratio
return np.clip(
(value - lower),
0, 1,
)
def get_all_mobjects(self):
"""