tkinter questions--- part 2 - Printable Version

tkinter questions--- part 2 - Printable Version

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+--- Thread: tkinter questions--- part 2 (/thread-14472.html)

tkinter questions--- part 2 - ironsheep - Dec-02-2018

from tkinter import *
import random
import time

tk=Tk()
canvas=Canvas(tk, width=500, height=400)
canvas.pack()

class Ball:
    def init(self):
        self.shape = canvas.create_oval(10,10,60,60,fill="red")
        self.xspeed= 3
        self.yspeed= 4

    def move(self):
        canvas.move(self.shape, self.xspeed, self.yspeed)
        position= canvas.coords(ball)
        if position[3]>= 400 or position[1] <= 0:
            self.yspeed= -self.yspeed
        if position[2] >= 500 or position[0] <= 0:
            self.xspeed= -self.xspeed
        
ball1= Ball()

while True:
    ball1.move()
    tk.update()
    time.sleep(.01)

I keep getting the

Error:Traceback (most recent call last):
  File "C:\Users\Mitesh Patel\Desktop\trash.py", line 26, in <module>
    ball1.move()
  File "C:\Users\Mitesh Patel\Desktop\trash.py", line 16, in move
    canvas.move(self.shape, self.xspeed, self.yspeed)
AttributeError: 'Ball' object has no attribute 'shape'
>>>

Why won't a ball oval shaped appear and move around on my screen??

RE: tkinter questions--- part 2 - woooee - Dec-02-2018

Tkinter requires a mainloop() which is an infinite loop that checks for events, places widgets on the screen, etc.

RE: tkinter questions--- part 2 - jfong - Dec-02-2018

first, line 10 should be
def __init__(self):
second, line 17 should be
position= canvas.coords(self.shape)

RE: tkinter questions--- part 2 - ironsheep - Dec-02-2018

I still don't get it---

from tkinter import *
import random
import time

tk=Tk()
canvas=Canvas(tk, width=500, height=400)
canvas.pack()

class Ball:
    def _init_(self):
        self.shape = canvas.create_oval(10,10,60,60,fill="red")
        self.xspeed= 3
        self.yspeed= 4

    def move(self):
        canvas.move(self.shape, self.xspeed, self.yspeed)
        position= canvas.coords(self.shape)
        if position[3]>= 400 or position[1] <= 0:
            self.yspeed= -self.yspeed
        if position[2] >= 500 or position[0] <= 0:
            self.xspeed= -self.xspeed
        
ball1 = Ball()

while True:
    ball1.move()
    tk.update()
    time.sleep(.01)

tk.mainloop()

Error:Traceback (most recent call last):
  File "C:\Users\Mitesh Patel\Desktop\trash.py", line 26, in <module>
    ball1.move()
  File "C:\Users\Mitesh Patel\Desktop\trash.py", line 16, in move
    canvas.move(self.shape, self.xspeed, self.yspeed)
AttributeError: 'Ball' object has no attribute 'shape'

Ball1 is obviously a ball--- how can the computer not get that???

RE: tkinter questions--- part 2 - jfong - Dec-03-2018

It's double underscore, __init__()
By the way, the last line tk.mainloop() is not required. In your codes, the while loop works like it.

RE: tkinter questions--- part 2 - ironsheep - Dec-03-2018

from tkinter import *
import random
import time
 
tk=Tk()
canvas=Canvas(tk, width=500, height=400)
canvas.pack()
 
class Ball:
    def__init__(self):
        self.shape = canvas.create_oval(10,10,60,60,fill="red")
        self.xspeed= 3
        self.yspeed= 4
 
    def move(self):
        canvas.move(self.shape, self.xspeed, self.yspeed)
        position= canvas.coords(self.shape)
        if position[3]>= 400 or position[1] <= 0:
            self.yspeed= -self.yspeed
        if position[2] >= 500 or position[0] <= 0:
            self.xspeed= -self.xspeed
         
ball1 = Ball()
 
while True:
    ball1.move()
    tk.update()
    time.sleep(.01)

Now I keep getting invalid syntax?????

RE: tkinter questions--- part 2 - jfong - Dec-04-2018

The Traceback should tell you where the error is.
def__init__(self):

RE: tkinter questions--- part 2 - ironsheep - Dec-07-2018

from tkinter import *
import random
import time
 
tk=Tk()
canvas=Canvas(tk, width=500, height=400)
canvas.pack()
 
class Ball:
    def init_(self):
        self.shape = canvas.create_oval(10,10,60,60,fill="red")
        self.xspeed= 3
        self.yspeed= 4
 
    def move(self):
        canvas.move(self.shape, self.xspeed, self.yspeed)
        position= canvas.coords(ball)
        if position[3]>= 400 or position[1] <= 0:
            self.yspeed= -self.yspeed
        if position[2] >= 500 or position[0] <= 0:
            self.xspeed= -self.xspeed
         
ball1= Ball()
 
while True:
    ball1.move()
    tk.update()
    time.sleep(.01)

I still don't get it

RE: tkinter questions--- part 2 - ironsheep - Dec-09-2018

from tkinter import *
import random
import time
 
tk=Tk()
canvas=Canvas(tk, width=500, height=400)
canvas.pack()
 
class Ball:
    def__init__(self):
        self.shape = canvas.create_oval(10,10,60,60,fill="red")
        self.xspeed= 3
        self.yspeed= 4
 
    def move(self):
        canvas.move(self.shape, self.xspeed, self.yspeed)
        position= canvas.coords(ball)
        if position[3]>= 400 or position[1] <= 0:
            self.yspeed= -self.yspeed
        if position[2] >= 500 or position[0] <= 0:
            self.xspeed= -self.xspeed
         
ball1= Ball()
 
while True:
    ball1.move()
    tk.update()
    time.sleep(.01)

I do double underscore and I still get syntax error