[Tutor] How to make object disappear?

[Lisa Hasler Waters]

Dear Tutor,

My students and I are creating a maze game in tkinter. We are trying to
make the ball disappear when it hits the wall (black lines). We are not
having much luck. The following code has run the best, but still, the ball
does not disappear. Any advice would be appreciated!

from tkinter import *
import random
import time


tk = Tk()
tk.title("Game")
tk.resizable(0, 0)
tk.wm_attributes("-topmost", 1)
canvas = Canvas(tk, width=1400, height=835, bd=0, highlightthickness=0)
canvas.pack()
tk.update()


class dot:
    def __init__(self, canvas, color):
        self.canvas = canvas
        self.id = canvas.create_oval(15, 15, 30, 30, fill='Blue',
tags='dot1')

this = dot(canvas, 'blue')

def ball(n, x, y):
    canvas.move(n, x, y)

def mt(event):
            if event.keysym == 'Left':
                ball(1, -30, 0)
                restart()
            elif event.keysym == 'Up':
                ball(1, 0, -30)
                restart()
            elif event.keysym == 'Down':
                ball(1, 0, 30)
                restart()
            elif event.keysym == 'Right':
                ball(1, 30, 0)
                restart()
            else:
                ball(1, 30, 0)
                restart()

canvas.bind_all('<KeyPress-Up>', mt)
canvas.bind_all('<KeyPress-Down>', mt)
canvas.bind_all('<KeyPress-Left>', mt)
canvas.bind_all('<KeyPress-Right>', mt)

dot_bbox = canvas.coords('dot1')




x = dot_bbox[0]
y = dot_bbox[1]
x2 = dot_bbox[2]
y2 = dot_bbox[3]

canvas.create_line(0, 0, 0, 300, width=20)
canvas.create_line(0, 300, 300, 300, width=10)
canvas.create_line(80, 240, 80, 0, width=10)
canvas.create_line(160, 300, 160, 60, width=10)
canvas.create_line(240, 240, 240, 0, width=10)
canvas.create_line(300, 300, 300, 150, width=10)
canvas.create_line(300, 150, 600, 150, width=10)
canvas.create_line(80, 0, 2000, 0, width=30)
canvas.create_line(300, 75, 600, 75, width=10)
canvas.create_line(760, 0, 760, 300, width=10)
canvas.create_line(600, 75, 680, 75, width=10)

def restart():
    if (canvas.find_overlapping(x, y, x2, y2) == (1, 2)) or
(canvas.find_overlapping(x, y, x2, y2) == (1, 3)) or
(canvas.find_overlapping(x, y, x2, y2) == (1, 4)) or
(canvas.find_overlapping(x, y, x2, y2) == (1, 5)) or
(canvas.find_overlapping(x, y, x2, y2) == (1, 6)) == True:
        canvas.delete('dot1')






Shell:

Python 3.5.1 (v3.5.1:37a07cee5969, Dec  5 2015, 21:12:44)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "copyright", "credits" or "license()" for more information.
>>> WARNING: The version of Tcl/Tk (8.5.9) in use may be unstable.
Visit http://www.python.org/download/mac/tcltk/ for current information.

>>>
================ RESTART: /Users/BScherer/Desktop/MazeTest.py
================
>>>
=============================== RESTART: Shell
===============================
>>>
================ RESTART: /Users/BScherer/Desktop/MazeTest.py
================
>>>
=============================== RESTART: Shell
===============================
>>> from tkinter import *
>>> import random
>>> import time
>>> tk = Tk()
>>>
>>> tk.title("Game")
''
>>> tk.resizable(0, 0)
''
>>> tk.wm_attributes("-topmost", 1)
''
>>> canvas = Canvas(tk, width=1400, height=835, bd=0, highlightthickness=0)
>>> canvas.pack()
>>> tk.update()
>>> class dot:
    def __init__(self, canvas, color):
        self.canvas = canvas
        self.id = canvas.create_oval(10, 10, 25, 25, fill='Blue',
tags='dot1')


>>> this = dot(canvas, 'blue')
>>> def ball(n, x, y):
    canvas.move(n, x, y)


>>> def mt(event):
            if event.keysym == 'Left':
                ball(1, -30, 0)
                restart()
            elif event.keysym == 'Up':
                ball(1, 0, -30)
                restart()
            elif event.keysym == 'Down':
                ball(1, 0, 30)
                restart()
            elif event.keysym == 'Right':
                ball(1, 30, 0)
                restart()
            else:
                ball(1, 30, 0)
                restart()


>>> canvas.bind_all('<KeyPress-Up>', mt)
'4300440008mt'
>>> canvas.bind_all('<KeyPress-Down>', mt)
'4329736584mt'
>>> canvas.bind_all('<KeyPress-Left>', mt)
'4380738824mt'
>>> canvas.bind_all('<KeyPress-Right>', mt)
'4383283336mt'
>>> dot_bbox = canvas.coords('dot1')
>>> x = dot_bbox[0]
>>> y = dot_bbox[1]
>>> x2 = dot_bbox[2]
>>> y2 = dot_bbox[3]
>>> print(canvas.find_overlapping(x, y, x2, y2))
(1,)
>>> print(canvas.find_overlapping(x, y, x2, y2))
(1,)
>>> canvas.create_line(0, 0, 0, 300, width=20)
2
>>> print(canvas.find_overlapping(x, y, x2, y2))
(1, 2)
>>> canvas.create_line(600, 75, 680, 75, width=10)
3
>>> print(canvas.find_overlapping(x, y, x2, y2))
(1, 2)
>>>
================ RESTART: /Users/BScherer/Desktop/MazeTest.py
================
>>>
=============================== RESTART: Shell
===============================
>>>
================ RESTART: /Users/BScherer/Desktop/MazeTest.py
================
>>>
=============================== RESTART: Shell
===============================
>>>
================ RESTART: /Users/BScherer/Desktop/MazeTest.py
================
>>>
=============================== RESTART: Shell
===============================
>>>
================ RESTART: /Users/BScherer/Desktop/MazeTest.py
================
>>>
================ RESTART: /Users/BScherer/Desktop/MazeTest.py
================
>>>
================ RESTART: /Users/BScherer/Desktop/MazeTest.py
================
>>>

-- 
Lisa Waters, PhD
Technology Integration
Flint Hill School