import cv2 as cv
import matplotlib.pyplot as plt
import numpy as np


def createBox():
    box = np.zeros((100, 100), np.uint8) + 255
    print(type(box))
    shape = box.shape
    box = cv.circle(box, (30, 50), 25, 0, -1)  # type: ignore
    for i in range(shape[0]):
        for j in range(shape[1]):
            if j in range(45, 95) and i in range(25, 75):
                box[i, j] = 195
    return box


def histogram(image):
    (row, col) = image.shape
    hist = [0] * 256
    for i in range(row):
        for j in range(col):
            hist[image[i, j]] += 1
    return hist


if __name__ == "__main__":
    image0 = createBox()
    plt.figure()
    plt.subplot(1, 2, 1)
    plt.imshow(image0, vmin=0, vmax=255, cmap="gray")  # type: ignore
    plt.title("idel image")
    plt.axis("off")
    image_hist0 = histogram(image0)
    plt.subplot(1, 2, 2)
    plt.bar(range(256), image_hist0)
    plt.tight_layout()
    plt.show()