turtle.ondrag() function in Python
Last Updated :
17 Aug, 2020
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The turtle module provides turtle graphics primitives, in both object-oriented and procedure-oriented ways. Because it uses tkinter for the underlying graphics, it needs a version of Python installed with Tk support.
turtle.ondrag()
This function is used to bind fun to mouse-move event on this turtle on canvas.Syntax : turtle.ondrag(fun, btn, add) Parameters :
- fun : a function with two arguments, to which will be assigned the coordinates of the clicked point on the canvas
- btn : number of the mouse-button defaults to 1 (left mouse button)
- add : True or False. If True, new binding will be added, otherwise it will replace a former binding
Below is the implementation of the above method with an example :
Example :# importing package
import turtle
# method to call on drag
def fxn(x, y):
# stop backtracking
turtle.ondrag(None)
# move the turtle's angle and direction
# towards x and y
turtle.setheading(turtle.towards(x, y))
# go to x, y
turtle.goto(x, y)
# call again
turtle.ondrag(fxn)
# set turtle speed
turtle.speed(10)
# make turtle screen object
sc = turtle.Screen()
# set screen size
sc.setup(400, 300)
# call fxn on drag
turtle.ondrag(fxn)
# take screen in mainloop
sc.mainloop()
