EX12.10.py

# 12.10 (Tkinter: four cars) Write a program that simulates four cars racing, as shown in
# Figure 12.22. You should define a subclass of Canvas to display a car.

from tkinter import *  # Import tkinter


class RaceCar(Canvas):
    def __init__(self, master, width, height):
        Canvas.__init__(self, master, width=width, height=height)
        self["bg"] = "white"
        self.sleepTime = 100
        self.x = 10
        self.y = 50
        self.displayCar()

    def displayCar(self):
        self.delete("car")

        self.create_oval(self.x + 10, self.y - 10, self.x + 20, self.y, fill="black", tags="car")
        self.create_oval(self.x + 30, self.y - 10, self.x + 40, self.y, fill="black", tags="car")
        self.create_rectangle(self.x, self.y - 20, self.x + 50, self.y - 10, fill="green", tags="car")
        self.create_polygon(self.x + 10, self.y - 20, self.x + 20, self.y - 30,
                            self.x + 30, self.y - 30, self.x + 40, self.y - 20, fill="red", tags="car")


def run():
    while True:
        for car in cars:
            if car.x < int(car["width"]):
                car.displayCar()
                car.x += 4
            else:
                car.x = 0

            car.after(10)  # Sleep for 100 milliseconds
            car.update()


window = Tk()  # Create a window
window.title("Racing Cars")  # Set a title

width = 250
height = 48

cars = []
for i in range(4):
    cars.append(RaceCar(window, width=width, height=height))
    cars[i].pack()
run()

window.mainloop()  # Create an event loop