Update

The defined update Animation in update.py

• update.UpdateFromFunc(Animation)
  • update.UpdateFromAlphaFunc(UpdateFromFunc)
• update.MaintainPositionRelativeTo(Animation)

Class ChangingDecimal(Animation)

ChangingDecimal is used to transform the specified Mobject animatedly according to the specified function for given parameters.

Class ChangeDecimalToValue(ChangingDecimal)

ChangeDecimalToValue is used to transform the specified Mobject animatedly to the specified value for given parameters.

Example

Code

# folder/file: tut/manim_animation_updatefromfuncaplhamaintainpositionrelativeto_001a.py

import numpy as np
from manimlib.scene.scene import Scene
from manimlib.mobject.geometry import Circle, Square
from manimlib.mobject.svg.tex_mobject import TextMobject
#from manimlib.mobject.mobject import Group
from manimlib.animation.composition import AnimationGroup
from manimlib.animation.update import UpdateFromFunc, UpdateFromAlphaFunc, MaintainPositionRelativeTo
from manimlib.mobject.functions import FunctionGraph
from manimlib.utils.bezier import interpolate

class manim_animation_updatefromfuncaplhamaintainpositionrelativeto_001a(Scene): 
   def construct(self):
        a1=TextMobject("\\textbf{Test1 Text}",height=0.6).move_to([-4.5,2.5,0])
        a2=TextMobject("\\textbf{T2 Text}",height=0.28).move_to([1,2.5,0])
        a3=Circle(color="#FFFFFF").scale(0.8).move_to([4,2.5,0])
        a4=Square(fill_color="#00FF00",fill_opacity=1).scale(0.8).move_to([6,2.5,0])
        b1=TextMobject("\\textbf{Test1 Text}",height=0.6).move_to([-4.5,0,0])
        b2=TextMobject("\\textbf{T2 Text}",height=0.6).move_to([1,0,0])
        b3=Circle(color="#FFFFFF").scale(0.8).move_to([4,0,0])
        b4=Square(fill_color="#00FF00",fill_opacity=1).scale(0.8).move_to([6,0,0])
        c1=TextMobject("\\textbf{Test1 Text}",height=0.6).move_to([-4.5,-2.5,0])
        c2=TextMobject("\\textbf{T2 Text}",height=0.6).move_to([1,-2.5,0])
        c3=Circle(color="#FFFFFF").scale(0.8).move_to([4,-2.5,0])
        c4=Square(fill_color="#00FF00",fill_opacity=1).scale(0.8).move_to([6,-2.5,0])
        self.add(TextMobject("UpdateFromFunc").move_to([0,3.5,0]),TextMobject("UpdateFromAlphaFunc").move_to([0,1,0]),TextMobject("MaintainPositionRelativeTo").move_to([0,-1.5,0]))
        self.add(a1.copy(),a2.copy(),a3.copy(),a4.copy(),b1.copy(),b2.copy(),b3.copy(),b4.copy(),c1.copy(),c2.copy(),c3.copy(),c4.copy())
        self.wait(3)
        def funcupd1 (obj): return obj.scale(0.99).move_to(0.995*(obj.get_center()))
        def funcupd2 (obj): return obj.scale(1.01).move_to(1.002*(obj.get_center()))
        def funcupd3 (obj): return obj.stretch(0.9,0).move_to(0.995*(obj.get_center()))
        def funcupd4 (obj): return obj.stretch(0.9,1).move_to(0.995*(obj.get_center()))
        def funcalp1 (obj,alpha): 
           obj.rotate(alpha*3, about_point=obj.get_center())
        def funcalp2 (obj,alpha): 
           obj.shift(0.1*alpha*obj.get_center())
        def funcalp3 (obj,alpha):
            dt=interpolate(-1,1,alpha)
            obj.become(FunctionGraph(lambda t: 1.5*np.exp(-2*(t-a3.get_x()-dt)**2),x_min=2,x_max=6))
        def funcalp4 (obj,alpha):
            dt=interpolate(2,0,alpha)
            obj.become(FunctionGraph(lambda t: 8*np.exp(-dt-t)*np.cos(2*np.pi*(-t-dt)),x_min=2,x_max=6))
        self.play(AnimationGroup(UpdateFromFunc(a1.set_color("#888888"),funcupd1),UpdateFromAlphaFunc(b1.set_color("#888888"),funcalp1),MaintainPositionRelativeTo(c1.set_color("#888888"),a1)),run_time=1)
        self.wait(3)
        self.play(AnimationGroup(UpdateFromFunc(a2.set_color("#888888"),funcupd2),UpdateFromAlphaFunc(b2.set_color("#888888"),funcalp2),MaintainPositionRelativeTo(c2.set_color("#888888"),a2)),run_time=1)
        self.wait(3)
        self.play(AnimationGroup(UpdateFromFunc(a3.set_color("#888888"),funcupd3),UpdateFromAlphaFunc(b3.set_color("#888888"),funcalp3),MaintainPositionRelativeTo(c3.set_color("#888888"),a3)),run_time=1)
        self.wait(3)
        self.play(AnimationGroup(UpdateFromFunc(a4.set_color("#888888"),funcupd4),UpdateFromAlphaFunc(b4.set_color("#888888"),funcalp4),MaintainPositionRelativeTo(c4.set_color("#888888"),a4)),run_time=1)
        self.wait(3)

Output