Answer
code
Work Step by Step
# 9.19 (Move a circle using keys) Write a program that moves a circle up, down, left, or
# right using the arrow keys, as shown in Figure 9.30c–d.
from tkinter import *
class MainGUI:
def __init__(self):
window = Tk()
self.cavas = Canvas(window, width=500, height=500, bg="white")
self.cavas.pack()
self.cavas.create_oval(250, 250, 300, 300, tags="circle")
self.cavas.focus_set()
self.cavas.bind("", self.move)
window.mainloop()
def move(self,event):
x0, y0, x1, y1 = self.cavas.coords("circle")
if event.keysym == "Up":
y0 -= 5
y1 -= 5
elif event.keysym == "Down":
y0 += 5
y1 += 5
elif event.keysym == "Right":
x0 += 5
x1 += 5
elif event.keysym == "Left":
x0 -= 5
x1 -= 5
self.cavas.delete("circle")
self.cavas.create_oval(x0, y0, x1, y1, tags="circle")
MainGUI()
