import matplotlib.pyplot as plt


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 = [
        (2, 2, "1.89"),
        (2.5, 6, "1.89B"),
        (2.8, 10, "1.89"),
        (2.7, 14, "1.89"),
        (2.0, 18, "1.89"),
        (6.8, 2, "3.89"),
        (6.8, 6, "3.89"),
        (7.0, 10, "3.89"),
        (6.9, 14, "3.89"),
        (7.2, 18, "3.89"),
        (11.8, 2, "5.89"),
        (12.2, 6, "5.89"),
        (12.5, 10, "5.89"),
        (12.8, 14, "5.89"),
        (12.6, 18, "5.89"),
        (16.7, 2, "7.89"),
        (16.8, 6, "7.89"),
        (16.5, 10, "7.89"),
        (16.3, 14, "7.89"),
        (16.3, 18, "7.89"),
        (21.3, 2, "9.89"),
        (21.3, 6, "9.89"),
        (21.3, 10, "9.89"),
        (21.1, 14, "9.89"),
        (21.0, 18, "9.89"),
        (26.1, 2, "11.89"),
        (25.7, 6, "11.89"),
        (25.6, 10, "11.89"),
        (25.7, 14, "11.89"),
        (26.0, 18, "11.89"),
    ]

    for x, y, label in points:
        plt.scatter(x, y, color="red", s=15)
        plt.text(x + 0.3, y + 0.3, label, fontsize=9)

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


if __name__ == "__main__":
    main()