#Load the library
import numpy as np
import cv2
import matplotlib.pyplot as plt

#Draw a circle (white, red, green, blue)
white = cv2.circle(np.zeros((200, 200, 3), dtype=np.uint8), (100, 100), 50, (255, 255, 255), thickness = -1)
red = cv2.circle(np.zeros((200, 200, 3), dtype=np.uint8), (100, 100), 50, (0, 0, 255), thickness = -1)
green = cv2.circle(np.zeros((200, 200, 3), dtype=np.uint8), (100, 100), 50, (0, 255, 0), thickness = -1)
blue = cv2.circle(np.zeros((200, 200, 3), dtype=np.uint8), (100, 100), 50, (255, 0, 0), thickness = -1)

#title
titles = ['white', 'red', 'blue', 'green']

#Nesting graphs into lists
graphs = [white, red, blue, green]

#Set display area (row, column)
fig, ax = plt.subplots(2, 2)  

#Place the figure
for i in range(0,4):
    plt.subplot(2,2,i+1)
    plt.title(titles[i], fontsize=20)    #Give a title
    plt.tick_params(color='white')      #Erase memory
    plt.tick_params(labelbottom=False, labelleft=False, labelright=False, labeltop=False)
    plt.imshow(cv2.cvtColor(graphs[i], cv2.COLOR_BGR2RGB))   #Insert the figure
    plt.xlabel('X', fontsize=15)        #Give the x-axis a name
    plt.ylabel('Y', rotation=0, fontsize=15, labelpad=20) #Give the y-axis a name

#Make sure the figures do not overlap
plt.tight_layout()

#Show figure
plt.show()

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