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# 导入Manim核心库
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from manim import *
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# 导入Manim配置模块
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import manim
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class Updaters(Scene):
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def construct(self):
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# 创建圆角矩型，线宽8，线色白，填充色蓝，宽4.5高2，位置在上3左4
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rectangle = RoundedRectangle(stroke_width=8, stroke_color=WHITE, fill_color=BLUE_B, width=4.5, height=2).shift(
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UP * 3 + LEFT * 4)
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# 创建数学公式，设置渐变色，设置高度1.5
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mathtext = MathTex("\\frac{3}{4} = 0.75"
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).set_color_by_gradient(GREEN, PINK).set_height(1.5)
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# 数学公式位置放在圆角矩型中间
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mathtext.move_to(rectangle.get_center())
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# 给公式添加一个更新器，公式的位置保持在圆角矩型中间
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mathtext.add_updater(lambda x: x.move_to(rectangle.get_center()))
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# 开始动画播放
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# 动画，矩形出现方式
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self.play(FadeIn(rectangle))
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# 动画 公式出现
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self.play(Write(mathtext))
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# 动画，矩形移动向右1.5向下5，矩形移动时，公式跟随移动
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self.play(rectangle.animate.shift(RIGHT * 1.5 + DOWN * 5), run_time=6)
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# 等待上面动画完成
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self.wait()
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# 删除公式的更新器
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mathtext.clear_updaters()
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# 动画，矩形向左2向上1，公式不跟随矩形移动
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self.play(rectangle.animate.shift(LEFT * 2 + UP * 1), run_time=6)
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