Processing speed changes turtle animation speed

Question

I was learning python turtle module.

And I was trying to make a simple pong game.

Here is the code:

import turtle
import win32api

wind = turtle.Screen()
wind.title("Pong game")
wind.bgcolor("black")
wind.setup(width=800, height=500)
wind.tracer(0) # stops window from updating automaticly



# racket1
racket1 = turtle.Turtle()
racket1.speed(0)
racket1.penup()
racket1.color("blue")
racket1.shape("square")
racket1.goto(-370, 0)
racket1.shapesize(stretch_wid=5, stretch_len=1)

# racket2
racket2 = turtle.Turtle()
racket2.speed(0)
racket2.penup()
racket2.color("red")
racket2.shape("square")
racket2.goto(370, 0)
racket2.shapesize(stretch_wid=5, stretch_len=1)

# ball
ball = turtle.Turtle()
ball.speed(0)
ball.penup()
ball.color("white")
ball.shape("circle")
ball.goto(0, 0)
ball.dx = 0.2
ball.dy = 0.2

# score writer
scw = turtle.Turtle()
scw.penup()
scw.speed(0)
scw.hideturtle()
scw.goto(0, 210)
scw.color("white")
scw.write("Blue: 0                  Red: 0", font=("Arial", 24, "bold"), align="center")


# racket 1 functions
def racket1_up():
  y = racket1.ycor()
  if y < 200:
    y += 0.3
    racket1.sety(y)

def racket1_down():
  y = racket1.ycor()
  if y > -200:
    y -= 0.3
    racket1.sety(y)

# racket 2 functions
def racket2_up():
  y = racket2.ycor()
  if y < 200:
    y += 0.3
    racket2.sety(y)

def racket2_down():
  y = racket2.ycor()
  if y > -200:
    y -= 0.3
    racket2.sety(y)

# scores
p1 = 0
p2 = 0


while True:
  wind.update()

  # ball move
  ball.setx(ball.xcor() + ball.dx)
  ball.sety(ball.ycor() + ball.dy)

  # border check
  if ball.ycor() > 239: #240
    ball.dy *= -1

  if ball.ycor() < -239: #-240
    ball.dy *= -1

  if ball.xcor() > 389: #390
    ball.goto(0, 0)
    p1 += 1
    ball.dx *= -1
    scw.clear()
    scw.write(f"Blue: {p1}                  Red: {p2}", font=("Arial", 24, "bold"), align="center")

  if ball.xcor() < -389: #-390
    ball.goto(0, 0)
    p2 += 1
    ball.dx *= -1
    scw.clear()
    scw.write(f"Blue: {p1}                  Red: {p2}", font=("Arial", 24, "bold"), align="center")

  # ball and madareb collision
  if ball.xcor() > 350 and ball.ycor() < racket2.ycor()+60 and ball.ycor() > racket2.ycor()-60:
    ball.dx *= -1

  if ball.xcor() < -350 and ball.ycor() < racket1.ycor()+60 and ball.ycor() > racket1.ycor()-60:
    ball.dx *= -1

  # racket 1 movement
  w = win32api.GetKeyState(0x57)
  s = win32api.GetKeyState(0x53)

  if w < 0:
    racket1_up()
  if s < 0:
    racket1_down()

  # racket 2 movement
  u = win32api.GetKeyState(0x26)
  d = win32api.GetKeyState(0x28)

  if u < 0:
    racket2_up()
  if d < 0:
    racket2_down()

The game worked properly but the ball speed changes, I think that this is due to the change of the processing speed changes.

So is it possible to make the speed not change with the changing of the processing speed?

I don't think there will be a convenient way to achieve this with turtle. You should use a game library that is designed for such things, like Pygame. See for example https://stackoverflow.com/questions/13591949/in-pygame-normalizing-game-speed-across-different-fps-values — mkrieger1, Jan 10 '23 at 21:05
Use `ontimer` rather than a hard `while True:` loop that just slams the CPU as hard as it possibly can. — ggorlen, Jan 10 '23 at 22:29

Processing speed changes turtle animation speed

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