# -*- coding: utf-8 -*-.py
# -*- coding: utf-8 -*-
# Skeleton.py
from manim import *
import numpy as np

class Skeleton(Scene):
    # 定义坐标轴范围常量
    X_MIN = -3.5 * PI
    X_MAX = 3.5 * PI
    Y_MIN = -1.5
    Y_MAX = 1.5
    
    def construct(self):
        # 创建坐标系
        axes = Axes(
            x_range=[self.X_MIN, self.X_MAX, PI],
            y_range=[self.Y_MIN, self.Y_MAX, 0.5],
            axis_config={
                "color": WHITE,
                "include_tip": True,
                "include_numbers": False,
                "tick_size": 0
            }
        )
        
        # 添加坐标轴标签
        x_label = axes.get_x_axis_label(Text("x").scale(0.7), direction=DOWN)
        y_label = axes.get_y_axis_label(Text("y").scale(0.7), direction=LEFT)
        
        # 动画展示坐标轴(淡入效果)
        self.play(FadeIn(axes), run_time=1)
        self.play(Write(x_label), Write(y_label), run_time=1)
        
        # 创建正弦函数曲线
        sin_graph = axes.plot(
            lambda x: np.sin(x),
            color=GREEN
        )
        
        # 创建正弦函数标签
        sin_label = MathTex(r"\sin(x)").scale(0.7)
        sin_label.move_to(axes.c2p(-3 * PI, 1))
        
        # 动画: 绘制正弦曲线和标签
        self.play(Create(sin_graph), run_time=3)
        self.play(Write(sin_label), run_time=1)
        self.wait(1)
        
        # 创建余弦函数曲线(红色)
        cos_graph = axes.plot(
            lambda x: np.cos(x),
            color=RED
        )
        
        # 创建余弦函数标签位置(3π,-1)
        cos_label = MathTex(r"\cos(x)").scale(0.7)
        cos_label.move_to(axes.c2p(3 * PI, -1))
        
        # 动画: 将正弦曲线转换为余弦曲线
        self.play(TransformFromCopy(sin_graph, cos_graph), run_time=3)
        # 显示余弦函数标签
        self.play(Write(cos_label), run_time=1)
        self.wait(1)
        
        # 在屏幕上方显示三角函数关系式(黄色)
        formula = MathTex(
            r"\cos(x) = \sin\left(x + \frac{\pi}{2}\right)",
            color=YELLOW
        )
        formula.to_edge(UP)
        self.play(Write(formula), run_time=2)
        self.wait(2)
        
        # 创建值追踪器,从 -3π 到 3π
        x_tracker = ValueTracker(-3 * PI)
        
        # 创建动态虚线(黄色)
        vertical_line = always_redraw(lambda: DashedLine(
            start=axes.c2p(x_tracker.get_value(), self.Y_MIN),
            end=axes.c2p(x_tracker.get_value(), self.Y_MAX),
            color=YELLOW,
            stroke_width=2,
            dash_length=0.1
        ))
        
        # 创建动态点(绿色跟踪sin, 红色跟踪cos)
        sin_dot = always_redraw(lambda: Dot(
            point=axes.c2p(x_tracker.get_value(), np.sin(x_tracker.get_value())),
            color=GREEN,
            radius=0.08
        ))
        
        cos_dot = always_redraw(lambda: Dot(
            point=axes.c2p(x_tracker.get_value(), np.cos(x_tracker.get_value())),
            color=RED,
            radius=0.08
        ))
        
        # 添加动态元素到场景
        self.add(vertical_line, sin_dot, cos_dot)
        
        # 播放扫描动画(6秒匀速)
        self.play(
            x_tracker.animate.set_value(3 * PI),
            run_time=6,
            rate_func=linear
        )
        
        # 最后等待1秒
        self.wait(1)

if __name__ == "__main__":
    # 导入必要的模块
    import sys
    import os
    from manim import *
    
    # 设置 UTF-8 编码
    os.environ['PYTHONIOENCODING'] = 'utf-8'
    sys.stdout.reconfigure(encoding='utf-8')
    sys.stderr.reconfigure(encoding='utf-8')
    
    # 全局指定 ctex 模板(一次性)
    config.tex_template = TexTemplateLibrary.ctex
    # 设置输出格式为MP4
    config.output_format = "mp4"
    # 设置输出目录
    config.media_dir = "./output/videos/1080p60"
    # 使用临时配置渲染场景(配置只在with块内有效)
    with tempconfig({
        "quality": "high_quality",
        "background_color": BLACK,
        "preview": True,
        "pixel_height": 1080,
        "pixel_width": 1920,
        "frame_rate": 30
    }):
        # 实例化场景类
        scene = Skeleton()
        # 执行渲染流程(包含文件生成和预览)
        scene.render()