color_wheel.py

# import library
import matplotlib.pyplot as plt

def get_complementary_color(source_color):
    
    # creates dictionary of colors
    colors = {1:("#A3218E","Red-violet"),
              2:("#592F93","Violet"),
              3:("#21409A","Blue-violet"),
              4:("#0465B2","Blue"),
              5:("#00ACAC","Blue-green"),
              6:("#02A45E","Green"),
              7:("#6EBF43","Yellow-green"),
              8:("#FFF103","Yellow"),
              9:("#F8A519","Yellow-orange"),
              10:("#F58126","Orange"),
              11:("#ED403C","Red-orange"),
              12:("#EE1C25","Red")}
    
    # looks for the color position on the dictionary
    source_color_position = None
    for color_position, color_tuple in colors.items():
        if source_color == colors[color_position][1]:
            source_color_position = color_position
                    
    # now that we have the position, let's calculate the position of the complementary color
    complementary_color_position = None
    if source_color_position < 7:
        complementary_color_position = (source_color_position + 6)
    elif source_color_position > 6:
        complementary_color_position = (source_color_position + 6) - 12
        
    # get the color name on this position on the dictionary
    complementary_color_name = colors[complementary_color_position][1]

    # Now, let's get the colors hexadecimal codes and their names
    colors_hex = [color_tuple[0] for color_tuple in colors.values()]
    colors_names = [color_tuple[1] for color_tuple in colors.values()]

    # Let's give highlight the source color and the complementary color 
    #giving them higher size values in our donut chart.
    size_of_colors=[]
    for color in colors_names:
        if color != source_color and color != complementary_color_name:
            size_of_colors.append(5)
        else:
            size_of_colors.append(20)

    # Create a pieplot
    plt.pie(size_of_colors, labels=colors_names, colors=colors_values)

    # add a circle at the center
    white_circle=plt.Circle( (0,0), 0.7, color='white')
    p=plt.gcf()
    p.gca().add_artist(white_circle)

    plt.show()