# move_dot.py3  moving dot with direction arrow keys
# imports all forms of tkinter and tkinter files. ttk

from tkinter import *
from tkinter.ttk import *

class GFG:
  def __init__ (self, master = None ):
    self.master = master
    # slow default movement in the x,y direction
    self.x = 1
    self.y = 1
    # canvas object for creating the shape
    self.canvas = Canvas (master)
    # create a dot
    self.rectangle=self.canvas.create_oval(5, 5, 30, 30, fill="red")
    self.text=self.canvas.create_text(200, 20, text='use arrow keys to change direction', fill='black')
    self.canvas.pack ()
    # call the class move method in </ code> # move oval
    self.movement ()

  # end __init__

  def movement(self ):
    # The move () method is called here
    # This moves the object in the x, y direction
    self.canvas.move(self.rectangle, self.x, self.y)
    self.canvas.after(200, self.movement) # 200 milliseconds

  # end movement

  # to move in negative x direction
  def left(self, event):
   print(event.keysym)
   self . x = - 5
   self . y = 0

  # end left

  # to move in the positive x direction
  def right(self, event):
    print (event.keysym)
    self . x = 5
    self . y = 0

  # end right

  # for positive y direction
  def up(self, event):
    print (event.keysym)
    self . x = 0
    self . y = - 5

  # end up

  # to move in negative y direction
  def down(self, event):
    print(event.keysym)
    self.x = 0
    self.y = 5

  # end down

# end class GFG

if __name__ == "__main__" :
  # Tk class object responsible for creating
  # Tkinter top-level window
  # print("move_dot.py3 running  press arrow keys")
  master = Tk()
  master.title("move_dot.py3")
  # c=Canvas(master, width=400, height=400, bg='white') # ???
  # c.create_text(200, 20, text='use arrow keys to change direction', fill='black')
  gfg = GFG(master)
  # This will bind the arrow keys in tkinter
  # toplevel that will move the object around 
  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))
  # Endless loop is interrupted only by interruption
  print("running mainloop")
  mainloop ()
  print("move_dot.py3 finished")

# end move_dot.py3