draw a circles target using python

Question

This my program using turtle to draw the circle target:

import turtle

def origin_circle(turtle, radius):
    turtle.penup()
    turtle.goto(0, -radius)
    turtle.pendown()
    turtle.circle(radius)

for radius in range(100, 200, 10):
    origin_circle(turtle, radius)

The code makes a moving curve, but I want the circle to be drawn at once.

Does this help? https://stackoverflow.com/questions/16119991/how-to-speed-up-pythons-turtle-function-and-stop-it-freezing-at-the-end?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa — LangeHaare, May 08 '18 at 16:49
If you don't want animation, you can use `turtle.speed(0)` to make drawing happen instantly. — Håken Lid, May 08 '18 at 17:27

cdlane · Accepted Answer · 2018-05-09T21:22:41.587

The circle() method draws a circle, but the dot() method stamps one out. However, the dot() method doesn't have a separate line and fill concept and tends to overwrite itself, so we have to handle it carefully:

import turtle

def origin_circle(turtle, radius):
    turtle.dot(radius + 2, 'black')
    turtle.dot(radius, 'white')

for radius in range(200, 0, -40):
    origin_circle(turtle, radius)

turtle.hideturtle()

turtle.mainloop()

Alternatively, we could stamp out circular cursors ourselves:

import turtle

def origin_circle(turtle, radius):
    turtle.shapesize(radius)
    turtle.stamp()

turtle.shape('circle')
turtle.color('black', 'white')

for radius in range(10, 0, -2):
    origin_circle(turtle, radius)

turtle.hideturtle()

turtle.mainloop()

But this doesn't produce as pleasing a result:

Of course, we can always cheat and use turtle.speed('fastest'), or better yet, turn tracing off altogether:

import turtle

def origin_circle(turtle, radius):
    turtle.penup()
    turtle.sety(-radius)
    turtle.pendown()
    turtle.circle(radius, steps=90)

turtle.tracer(False)

for radius in range(20, 120, 20):
    origin_circle(turtle, radius)

turtle.hideturtle()

turtle.tracer(True)

turtle.mainloop()

But the result still won't look as nice as the turtle.dot() approach, even if you bump up the steps parameter of turtle.circle():

for the first code how to add an arrow on the top of each curve, one at down of each curve?

This is easier done modifying my third example as we can more easily draw semicircles and stamp the cursor. I'm using a custom cursor for arrow alignment across circles purposes:

import turtle

def origin_circle(turtle, radius):
    turtle.penup()
    turtle.sety(-radius)
    turtle.pendown()

    turtle.stamp()
    turtle.circle(radius, extent=180, steps=45)
    turtle.stamp()
    turtle.circle(radius, extent=180, steps=45)

turtle.addshape("pointer", ((0, 0), (5, -4), (0, 4), (-5, -4)))
turtle.shape("pointer")

turtle.tracer(False)

for idx, radius in enumerate(range(20, 120, 20), start=0):
    origin_circle(turtle, radius)

turtle.hideturtle()

turtle.tracer(True)

turtle.mainloop()

for the first code how to add an arrow on the top of each curve, one at down of each curve? — Sh Alzoubi, May 09 '18 at 10:44
@ShAlzoubi, I'd need to see an example as I don't understand your description. — cdlane, May 09 '18 at 18:05

score -1 · Answer 2 · answered Apr 24 '19 at 08:57

import turtle
ab=turtle.Turtle()
ab.speed(0)
import turtle

def zielscheibe(ringe=10):
    if ringe<1 or ringe>1000:
        ab.write('Bitte eine Zahl zwischen 1 und 1000 eingeben')
        return
    ab.pu()
    ab.goto(300,0)
    ab.seth(90)
    x=300/ringe
    for n in range(ringe):
        ab.pd()
        if n ==ringe-1:
            ab.color('black')
        elif n %2==0:
            ab.color('red')
        else:
            ab.color('white')
        ab.begin_fill()
        ab.circle(300-x*n)
        ab.end_fill()
        ab.pu()
        ab.left(90)
        ab.fd(x)
        ab.right(90)

zielscheibe(10)
turtle.mainloop()

draw a circles target using python

2 Answers2