当前位置:首页>课件>Manim 制作课件: 导数和变化率——(3):直线变化率与斜率的直观联系

Manim 制作课件: 导数和变化率——(3):直线变化率与斜率的直观联系

  • 2026-04-12 16:26:53
Manim 制作课件: 导数和变化率——(3):直线变化率与斜率的直观联系

本动画通过一个简单的一次函数 ,直观展示直线变化率与斜率的等价关系。

核心思想

动画围绕两个核心概念展开:

  1. 直线的变化率:与曲线不同,直线在各处的变化率保持恒定,这一恒定值恰好等于其斜率
  2. 符号对应:通过视觉连接,建立公式符号与文字概念的对应关系,帮助理解抽象的代数符号所代表的几何意义

动画结构

第一部分:基础建立

  • 构建坐标系并绘制一次函数  的图像,其中 
  • 显示公式标签 ,为后续高亮符号  做准备
  • 通过渐显动画,让坐标系、函数图像、公式标签依次呈现,节奏舒缓

第二部分:概念引入

  • 用黑色半透明遮罩暂时隐藏函数图像,将观众注意力聚焦到核心概念上
  • 逐步显示文字说明:“直线变化率 = 斜率”
  • 文字分三部分依次出现,模拟思考的渐进过程,强化记忆

第三部分:视觉连接

  • 高亮公式中的  部分(用黄色标记),强调符号的重要性
  • 绘制两条弯曲箭头,分别连接高亮部分与“变化率”、“斜率”文字
  • 箭头采用不同方向的弧度,在视觉上形成对称美感,同时暗示两者指向同一符号

通过这三个递进环节,观众能够直观理解:一次函数中的系数 ,既是公式中的参数,也代表直线的变化率,更是几何意义上的斜率。

完整代码

from utils import *config.tex_template = myTemplateclassv3(Scene):defconstruct(self):# ============ 1. 坐标轴和函数图形 ============        ax, ax_x_label, ax_y_label = axes_func()  # 获取坐标轴及标签        f = f_func1(0.52)                            # 定义函数 f(x) = 0.5x + 2        gr = ax.plot(f, x_range=[-113], stroke_width=4, color=GREEN)        gr_label = MathTex("y = ax + b", color=GREEN).to_edge(UP, buff=1)        self.play(LaggedStart(FadeIn(ax), FadeIn(ax_x_label, ax_y_label),                              Create(gr), FadeIn(gr_label), lag_ratio=0.2))        self.wait(2)# ============ 2. 黑框遮蔽,显示文字说明 ============        black_sq = Square(color=BLACK).set_opacity(0.8).scale(10)        t1 = Tex(r"直线变化率\ ""="r"\ 斜率").scale(0.7)        self.play(FadeIn(black_sq, t1[0]))        self.wait(2)        self.play(FadeIn(t1[1]))        self.play(FadeIn(t1[2]))        self.wait(2)# ============ 3. 高亮公式中的"斜率" ============        gr_label_1 = gr_label.copy()        gr_label_1[0][2].set_color(YELLOW)            # 高亮 "a"# 绘制箭头,连接公式与说明文字        arrow_t2 = CurvedArrow(            gr_label_1[0][2].get_edge_center(DOWN) + DOWN * 0.2,            t1[0].get_edge_center(UP) + UP * 0.2, radius=4).set_color(GRAY_C)        arrow_t3 = CurvedArrow(            gr_label_1[0][2].get_edge_center(DOWN) + DOWN * 0.2,            t1[2].get_edge_center(UP) + UP * 0.2, radius=-4).set_color(GRAY_C)        self.play(FadeIn(gr_label_1))        self.wait(2)        self.play(FadeIn(arrow_t2))        self.wait(2)        self.play(FadeIn(arrow_t3))        self.wait(2)# 淡出所有元素        self.play(FadeOut(*self.mobjects))        self.wait(2)%manim -ql -v WARNING v3
——前文推荐——
Manim 制作课件: 导数和变化率——(2):辅助函数库
Manim 制作课件: 导数和变化率——(1):python 寻找函数导数和临界值

文章首发:微信公众号:数与理 | 发布日期: 2026 年 3 月 24 日

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  1. CONNECT:[ UseTime:0.000602s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000709s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001612s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000296s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000552s ]
  6. SELECT * FROM `set` [ RunTime:0.002894s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000641s ]
  8. SELECT * FROM `article` WHERE `id` = 485440 LIMIT 1 [ RunTime:0.000589s ]
  9. UPDATE `article` SET `lasttime` = 1776620491 WHERE `id` = 485440 [ RunTime:0.002280s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000263s ]
  11. SELECT * FROM `article` WHERE `id` < 485440 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000443s ]
  12. SELECT * FROM `article` WHERE `id` > 485440 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000369s ]
  13. SELECT * FROM `article` WHERE `id` < 485440 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000612s ]
  14. SELECT * FROM `article` WHERE `id` < 485440 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003583s ]
  15. SELECT * FROM `article` WHERE `id` < 485440 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001562s ]
0.089476s