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55 lines
1.5 KiB
Python
55 lines
1.5 KiB
Python
from __future__ import annotations
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from manimlib.animation.transform import Transform
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from manimlib.constants import PI
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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import numpy as np
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from manimlib.mobject.geometry import Arrow
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from manimlib.mobject.mobject import Mobject
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from manimlib.typing import ManimColor
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class GrowFromPoint(Transform):
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def __init__(
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self,
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mobject: Mobject,
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point: np.ndarray,
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point_color: ManimColor = None,
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**kwargs
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):
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self.point = point
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self.point_color = point_color
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super().__init__(mobject, **kwargs)
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def create_target(self) -> Mobject:
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return self.mobject
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def create_starting_mobject(self) -> Mobject:
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start = super().create_starting_mobject()
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start.scale(0)
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start.move_to(self.point)
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if self.point_color is not None:
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start.set_color(self.point_color)
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return start
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class GrowFromCenter(GrowFromPoint):
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def __init__(self, mobject: Mobject, **kwargs):
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point = mobject.get_center()
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super().__init__(mobject, point, **kwargs)
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class GrowFromEdge(GrowFromPoint):
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def __init__(self, mobject: Mobject, edge: np.ndarray, **kwargs):
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point = mobject.get_bounding_box_point(edge)
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super().__init__(mobject, point, **kwargs)
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class GrowArrow(GrowFromPoint):
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def __init__(self, arrow: Arrow, **kwargs):
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point = arrow.get_start()
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super().__init__(arrow, point, **kwargs)
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