while movinig an object how do i keep it inbounds

[deanhystad]

Another way to do this is do everything in absolute coordinates except the move request.

import tkinter as tk

def clip(x, lower, upper):
    """Clip value to be in range lower..uper"""
    return lower if x < lower else upper if x > upper else x

class Ship():
    def __init__(self, parent, wide, high):
        self.canvas = tk.Canvas(parent, width=wide, height=high)
        self.canvas.pack()
        self.img = tk.PhotoImage(file = "test_image.png")
        img_wide = self.img.width()
        img_high = self.img.height()
        self.xmax = wide - img_wide
        self.ymax = high - img_high
        x = int((wide - img_wide) / 2)
        y = int((high - img_high) / 2)
        self.img_id = self.canvas.create_image(x, y, anchor=tk.NW, image=self.img)
 
    def move(self, x, y):
        # Convert to absolute coordinates and clip to range
        imgx, imgy = self.canvas.coords(self.img_id)
        x = clip(x + imgx, 0, self.xmax)
        y = clip(y + imgy, 0, self.ymax)
        self.canvas.moveto(self.img_id, x, y)

def main():
    root = tk.Tk()
    ship = Ship(root, 500, 400)
    root.bind("<Right>", lambda e: ship.move(x=5, y=0))
    root.bind("<Left>",  lambda e: ship.move(x=-5, y=0))
    root.bind("<Up>",    lambda e: ship.move(x=0, y=-5))
    root.bind("<Down>",  lambda e: ship.move(x=0, y=5))
    root.mainloop()

main()