CODEWITHSUNDEEP
pythonanimationturtle-graphics
Robin Andrews
Robin Andrews

Reputation: 3804

Deformed Circle in Python Turtle Graphics Animation

Is there any way to not have the circle be deformed during the animation produced by the code below please? It seems that at anything other than a very slow speed the animation is unusabley distorted.

import turtle

SPEED = 5  # ms between frames?
STEP = 5  # Pixels per "step"


def move():
    global x, y, xdir, ydir

    x = x + xdir
    y = y + ydir

    if x >= right_edge:
        xdir = - xdir
    if x <= left_edge:
        xdir = - xdir
    if y >= top_edge:
        ydir = - ydir
    if y <= bottom_edge:
        ydir = -ydir

    turtle.goto(x, y)
    turtle.ontimer(move, SPEED)


screen = turtle.Screen()
screen.title("Bounce")
screen.bgcolor("pink")
turtle.color("blue")
turtle.shape("circle")
# turtle.shape("triangle")
turtle.penup()

x, y = 0, 0
xdir, ydir = STEP, STEP  # Vectors anyone?
right_edge = turtle.window_width() // 2
left_edge = -turtle.window_width() // 2
top_edge = turtle.window_height() // 2
bottom_edge = -turtle.window_height() // 2

move()

turtle.done()

Upvotes: 0

Views: 111

Answers (1)

cdlane
cdlane

Reputation: 41903

I find that dot() produces a higher quality circle than either circle() or shape('circle'):

from turtle import Screen, Turtle, Vec2D

SPEED = 5  # ms between frames
STEP = 5  # Pixels per "step"

X, Y = 0, 1  # vector index symbols

position = Vec2D(0, 0)
direction = Vec2D(STEP, STEP)  # Primitive vectors for everyone

def move():
    global position, direction

    position += direction

    if not left_edge <= position[X] <= right_edge:
        direction = Vec2D(-direction[X], direction[Y])

    if not bottom_edge <= position[Y] <= top_edge:
        direction = Vec2D(direction[X], -direction[Y])

    turtle.clear()
    turtle.goto(position)
    turtle.dot(20)

    screen.update()
    screen.ontimer(move, SPEED)

screen = Screen()
screen.title("Bounce")
screen.bgcolor('pink')
screen.tracer(False)

turtle = Turtle()
turtle.hideturtle()
turtle.color('blue')
turtle.shape('circle')
turtle.penup()

right_edge = screen.window_width() // 2
left_edge = -screen.window_width() // 2
top_edge = screen.window_height() // 2
bottom_edge = -screen.window_height() // 2

move()

screen.mainloop()

Upvotes: 1

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