Python Tkinter | Moving objects using Canvas.move() method
The Canvas class of Tkinter supports functions that are used to move objects from one position to another in any canvas or Tkinter top-level.
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.Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.
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We will use class to see the working of the 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:
Python3
# imports every file form tkinter and tkinter.ttkfrom 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 = 5if __name__ == "__main__": # object of class Tk, responsible 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)) # Infinite loop breaks only by interrupt mainloop() |
Output:
Extra print statements are used in the above code to show the proper working of the move() method. keysym keyword (Tkinter reserved) is used to print which keyboard key is pressed.
