from manim import *
import numpy as np

class CartesianPlaneScene(Scene):
    def construct(self):
        # 一、创建坐标平面，先隐藏网格和数字
        plane = NumberPlane(
            x_range=[-5, 5, 1],
            y_range=[-3, 3, 1],
            background_line_style={
                "stroke_color": GREY,
                "stroke_width": 1,
                "stroke_opacity": 1,
            },
            axis_config={
                "include_tip": True,
                "tip_length": 0.15,
            }
        )
        # 生成坐标数字，但先透明
        plane.add_coordinates()
        plane.background_lines.set_opacity(0)
        plane.coordinate_labels.set_opacity(0)

        # 二、动画绘制 X 轴和 Y 轴
        self.play(
            Create(plane.x_axis, run_time=2),
            Create(plane.y_axis, run_time=2),
        )
        self.wait(1)

        # 三、写出刻度数字
        self.play(
            FadeIn(plane.coordinate_labels, shift=DOWN*0.2),
            run_time=2
        )
        self.wait(1)

        # 四、绘制网格线
        self.play(
            Create(plane.background_lines, run_time=3),
        )
        self.wait(1)

        # 五、突出原点
        origin_dot = Dot(plane.c2p(0, 0), color=RED)
        self.play(FadeIn(origin_dot), run_time=1)
        self.wait(2)