import matplotlib.pyplot as plt
import numpy as np

def plot_quadrilateral(matrix):
    # Ensure the matrix has two rows and four columns
    if len(matrix) != 2 or len(matrix[0]) != 4:
        raise ValueError("The input matrix must have two rows and four columns.")

    # Get the coordinates of the vertices
    x_coords = matrix[0]
    y_coords = matrix[1]

    # Plot the points
    plt.scatter(x_coords, y_coords)

    # Connect the points to form the quadrilateral
    plt.plot([x_coords[0], x_coords[1]], [y_coords[0], y_coords[1]])
    plt.plot([x_coords[1], x_coords[2]], [y_coords[1], y_coords[2]])
    plt.plot([x_coords[2], x_coords[3]], [y_coords[2], y_coords[3]])
    plt.plot([x_coords[3], x_coords[0]], [y_coords[3], y_coords[0]])

    # Set the chart title and axis labels
    plt.title('Quadrilateral Plot')
    plt.xlabel('X axis')
    plt.ylabel('Y axis')

    # Ensure equal aspect ratio
    plt.axis('equal')

    plt.savefig('myplot.png')

# 示例矩阵
matrix = np.array([
    [1, 3, 3,1],  # x 坐标
    [2, 2, 4, 4]   # y 坐标
])

# 调用函数
plot_quadrilateral(matrix)
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