import matplotlib.pyplot as plt
import numpy as np


def main() -> None:
    plt.figure(figsize=(8.27, 11.69))
    plt.xlim(0, 30)
    plt.ylim(0, 20)
    plt.gca().set_aspect("equal", adjustable="box")
    plt.grid(True, linewidth=0.3)
    plt.xticks(range(0, 31, 2))
    plt.yticks(range(0, 21, 2))

    points = [
        # phi = 2.4
        (2.0, 2, "2.4"),
        (2.1, 4, "2.4"),
        (2.6, 6, "2.4"),
        (2.8, 8, "2.4"),
        (3.0, 10, "2.4"),
        (2.8, 12, "2.4"),
        (3.1, 14, "2.4"),
        (2.7, 16, "2.4"),
        (2.8, 18, "2.4"),
        # phi = 3.4
        (4.1, 2, "3.4"),
        (4.0, 4, "3.4"),
        (4.1, 6, "3.4"),
        (4.0, 8, "3.4"),
        (4.2, 10, "3.4"),
        (4.2, 12, "3.4"),
        (4.6, 14, "3.4"),
        (4.5, 16, "3.4"),
        (4.8, 18, "3.4"),
        # phi = 4.4
        (6.1, 2, "4.4"),
        (5.9, 4, "4.4"),
        (5.9, 6, "4.4"),
        (5.5, 8, "4.4"),
        (5.8, 10, "4.4"),
        (5.7, 12, "4.4"),
        (6.3, 14, "4.4"),
        (7.0, 16, "4.4"),
        (7.5, 18, "4.4"),
        # phi = 5.4
        (8.4, 2, "5.4"),
        (7.8, 4, "5.4"),
        (7.4, 6, "5.4"),
        (7.2, 8, "5.4"),
        (7.2, 10, "5.4"),
        (7.7, 12, "5.4"),
        (8.2, 14, "5.4"),
        (9.8, 18, "5.4"),
        # phi = 6.4
        (11.2, 2, "6.4"),
        (9.0, 6, "6.4"),
        (8.8, 10, "6.4"),
        (11.0, 14, "6.4"),
        (12.3, 18, "6.4"),
        # phi = 7.4
        (16.0, 2, "7.4"),
        (15.5, 18, "7.4"),
        # phi = 8.4
        (19.8, 2, "8.4"),
        (20.3, 4, "8.4"),
        (21.3, 6, "8.4"),
        (21.7, 8, "8.4"),
        (21.8, 10, "8.4"),
        (21.3, 12, "8.4"),
        (20.7, 14, "8.4"),
        (19.7, 16, "8.4"),
        (18.0, 18, "8.4"),
        # phi = 9.4
        (22.2, 2, "9.4"),
        (22.8, 6, "9.4"),
        (22.9, 10, "9.4"),
        (22.5, 14, "9.4"),
        (21.7, 18, "9.4"),
        # phi = 10.4
        (24.5, 2, "10.4"),
        (24.4, 6, "10.4"),
        (24.6, 10, "10.4"),
        (24.2, 14, "10.4"),
        (23.9, 18, "10.4"),
        # phi = 11.4
        (26.7, 2, "11.4"),
        (26.2, 6, "11.4"),
        (26.2, 10, "11.4"),
        (26.0, 14, "11.4"),
        (26.1, 18, "11.4"),
    ]

    for x, y, label in points:
        plt.scatter(x, y, color="red", s=10)
        plt.text(x + 0.3, y + 0.3, label, fontsize=9)

    theta = np.linspace(0, 2 * np.pi, 200)
    cx, cy = 15, 9

    for r in [5, 6]:
        x = cx + r * np.cos(theta)
        y = cy + r * np.sin(theta)
        plt.plot(x, y, color="blue", linewidth=1)

    plt.xlabel("X (см)")
    plt.ylabel("Y (см)")
    plt.title("Эквипотенциальные точки с кольцом")
    plt.tight_layout()
    plt.savefig("points.png", dpi=300)


if __name__ == "__main__":
    main()