用Python打造精彩动画与视频, 6.2 使用Manim进行数学和科学可视化

from manim import *

class MovingCircle(Scene):

    def construct(self):

        circle = Circle()  # 创建一个圆

        circle.set_fill(PINK, opacity=0.5)  # 设置填充颜色和透明度

        self.play(Create(circle))  # 绘制圆

        self.play(circle.animate.shift(RIGHT * 2))  # 将圆向右移动

        self.play(FadeOut(circle))  # 淡出圆

from manim import *

class QuadraticFormula(Scene):

    def construct(self):

        formula = MathTex(r"x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}")

        self.play(Write(formula))  # 逐步写出公式

        self.play(formula.animate.to_edge(UP))  # 将公式移到屏幕上方

from manim import *

class ProjectileMotion(Scene):

    def construct(self):

        projectile = Dot().move_to(LEFT * 3 + DOWN * 2)

        path = TracedPath(projectile.get_center, stroke_color=YELLOW)

        self.add(path)

        self.play(projectile.animate.apply_complex_function(lambda z: z + z**2))

from manim import *

class DynamicGraph(Scene):

    def construct(self):

        axes = Axes(x_range=[-3, 3], y_range=[-1, 1])

        graph = axes.plot(lambda x: np.sin(x), color=BLUE)

                self.play(Create(axes), Create(graph))

        graph.add_updater(lambda mob: mob.become(

            axes.plot(lambda x: np.sin(x + self.time), color=BLUE)

        ))

        self.wait(2)

        graph.remove_updater()