need help to get my python image to move around using tkinter

[twg...@googlemail.com]

Hi I am new here and to python,

I am currently studying towards my degree in computer science and have to build a program but I have hit a brick wall. I am trying to make an image move around the canvas. I can make a rectangle move using the following:

#test rectangle
id1=canvas.create_rectangle(3,7,3+10,7+10)

# Generate x and y coordinates for 500 timesteps
for t in range(1, 500):

x1,y1,x2,y2=canvas.coords(id1)

# If a boundary has been crossed, reverse the direction
if x1 >= x_max:
vx = -10.0
if y1 <= y_min:
vy = 5.0
if y2 >= y_max:
vy = -5.0
if x1 <= x_min:
vx = 10.0

# Reposition the robot
canvas.coords(id1,x1+vx,y1+vy,x2+vx,y2+vy)
canvas.update()

# Pause for 0.1 seconds, then delete the image
time.sleep(0.1)

However i would like my image/sprite to move around:

objecttank=canvas.create_image(950,650,image=gif6, anchor= NW)

from what i gather it is because an image only has two axis, x and y but the rectangle seems to have 4 values, my error code keeps saying expecting 4 but got 2.

Can anyone help me in the right direction, many thanks tom.

[Peter Otten]

twgrops--- via Python-list wrote:

> Hi I am new here and to python,
>
> I am currently studying towards my degree in computer science and have to
> build a program but I have hit a brick wall. I am trying to make an image
> move around the canvas. I can make a rectangle move using the following:
>
> #test rectangle
> id1=canvas.create_rectangle(3,7,3+10,7+10)
>
> # Generate x and y coordinates for 500 timesteps
> for t in range(1, 500):
>
> x1,y1,x2,y2=canvas.coords(id1)
>
> # If a boundary has been crossed, reverse the direction
> if x1 >= x_max:
> vx = -10.0
> if y1 <= y_min:
> vy = 5.0
> if y2 >= y_max:
> vy = -5.0
> if x1 <= x_min:
> vx = 10.0
>
> # Reposition the robot
> canvas.coords(id1,x1+vx,y1+vy,x2+vx,y2+vy)
> canvas.update()
>
> # Pause for 0.1 seconds, then delete the image
> time.sleep(0.1)

You should never use sleep() in conjunction with tkinter. Instead make a
little function that schedules itself for invocation after a few
milliseconds:

def move():
... # move sprits
root.after(100, move) # have tkinter call move()
# again after 100 milliseconds

That way the event loop is undisturbed and the application can respond to
user input.

> However i would like my image/sprite to move around:
>
> objecttank=canvas.create_image(950,650,image=gif6, anchor= NW)
>
> from what i gather it is because an image only has two axis, x and y but
> the rectangle seems to have 4 values, my error code keeps saying expecting
> 4 but got 2.

Always provide the exact code causing the error, and the traceback it
generated. Use copy and paste instead of paraphrasing.

> Can anyone help me in the right direction, many thanks tom.

I think I have done this before, but cannot find it atm, so instead of a
link here's a new demo:

try:
import tkinter as tk
except ImportError:
import Tkinter as tk

import random

WIDTH = 1024
HEIGHT = 768


def random_speed():
return random.choice([-1, 1]) * random.randrange(5, 15)


def random_image(canvas, image):
"""Place `image` on `canvas` with random pos and speed.
"""
return Image(
canvas,
image,
random.randrange(WIDTH-image.width()),
random.randrange(HEIGHT-image.height()),
random_speed(),
random_speed(),
)


class Image(object):
def __init__(self, canvas, image, x, y, vx, vy):
self.canvas = canvas
self.image = image
self.x = x
self.y = y
self.vx = vx
self.vy = vy
self.w = image.width()
self.h = image.height()
self.id = canvas.create_image(x, y, image=image, anchor=tk.NW)

@property
def right(self):
return self.x + self.w

@property
def bottom(self):
return self.y + self.h

def move(self):
self.x += self.vx
self.y += self.vy
self.canvas.move(self.id, self.vx, self.vy)
if self.bottom > HEIGHT or self.y < 0:
self.vy = - self.vy
if self.right > WIDTH or self.x < 0:
self.vx = - self.vx


def move():
for image in images:
image.move()
root.after(50, move)


if __name__ == "__main__":
root = tk.Tk()
ball = tk.PhotoImage(file="ball.gif")
canvas = tk.Canvas(root, width=WIDTH, height=HEIGHT)
canvas.pack()
images = [random_image(canvas, ball) for _ in range(10)]
move()
root.mainloop()

[Thomas Grops]

thankyou so much, that is the exact help I required to put me in the right direction :D