from tkinter import * # Import tkinter
import math 

radius = 100
width = 300
height = 300
        
class MainGUI:
    def drawAPie(self, start, extent, color, title):
        self.canvas.create_arc(width / 2 - radius, height / 2 - radius, 
            width / 2 + radius, height / 2 + radius, 
            start = start, extent = extent, fill = color)
        x = width / 2 + radius * math.cos(math.radians(extent / 2 + start))
        y = height / 2 - radius * math.sin(math.radians(extent / 2 + start))
        self.canvas.create_text(x, y, text = title)
 
    def __init__(self):
        window = Tk() # Create a window
        window.title("Pie Chart") # Set a title
        
        self.canvas = Canvas(window, bg = "white", width = width, height = height)
        self.canvas.pack()
        
        self.drawAPie(0, 360 * 0.2, "red", "Project -- 20%")
        self.drawAPie(360 * 0.2, 360 * 0.1, "blue", "Quizzes -- 10%")
        self.drawAPie(360 * 0.2 + 360 * 0.1, 360 * 0.3, "green", "Midterm -- 30%")
        self.drawAPie(360 * 0.2 + 360 * 0.1 + 360 * 0.3, 360 * 0.4, "orange", "Final -- 40%")
        
        window.mainloop() # Create an event loop

MainGUI()