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Python Tkinter | Moving objects using Canvas.move() method
  • Difficulty Level : Easy
  • Last Updated : 18 Jun, 2019

Canvas class of Tkinter supports a functions which is used to move objects from one position to another in any canvas or tkinter toplevel.

Syntax: Canvas.move(canvas_object, x, y)

Parameters:
canvas_object is any valid image or drawing created with the help of Canvas class. To know how to create object using Canvas class take reference of this.
x is horizontal distance from upper-left corner.
y is vertical distance from upper-left corner.

We will use class to see the working of move() method.

Class parameters-



Data members used:
master
x
y
canvas
rectangle

Member functions used:
movement()
left()
right()
up()
down()

Widgets used: Canvas

Tkinter method used:
Canvas.create_rectangle()
pack()
Canvas.move()
after()
bind()

Below is the Python implementation:




# imports every file form tkinter and tkinter.ttk
from tkinter import *
from tkinter.ttk import * 
  
class GFG:
    def __init__(self, master = None):
        self.master = master
          
        # to take care movement in x direction
        self.x = 1
        # to take care movement in y direction
        self.y = 0
  
        # canvas object to create shape
        self.canvas = Canvas(master)
        # creating rectangle
        self.rectangle = self.canvas.create_rectangle(
                         5, 5, 25, 25, fill = "black")
        self.canvas.pack()
  
        # calling class's movement method to 
        # move the rectangle
        self.movement()
      
    def movement(self):
  
        # This is where the move() method is called
        # This moves the rectangle to x, y coordinates
        self.canvas.move(self.rectangle, self.x, self.y)
  
        self.canvas.after(100, self.movement)
      
    # for motion in negative x direction
    def left(self, event):
        print(event.keysym)
        self.x = -5
        self.y = 0
      
    # for motion in positive x direction
    def right(self, event):
        print(event.keysym)
        self.x = 5
        self.y = 0
      
    # for motion in positive y direction
    def up(self, event):
        print(event.keysym)
        self.x = 0
        self.y = -5
      
    # for motion in negative y direction
    def down(self, event):
        print(event.keysym)
        self.x = 0
        self.y = 5
  
if __name__ == "__main__":
  
    # object of class Tk, resposible for creating
    # a tkinter toplevel window
    master = Tk()
    gfg = GFG(master)
  
    # This will bind arrow keys to the tkinter
    # toplevel which will navigate the image or drawing
    master.bind("<KeyPress-Left>", lambda e: gfg.left(e))
    master.bind("<KeyPress-Right>", lambda e: gfg.right(e))
    master.bind("<KeyPress-Up>", lambda e: gfg.up(e))
    master.bind("<KeyPress-Down>", lambda e: gfg.down(e))
      
    # Infnite loop breaks only by interrupt
    mainloop()

Output:

Extra print statements are used in above code to show the proper working of move() method. keysym keyword (Tkinter reserved) is used to print which keyboard key is pressed.

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