Drawing a triangle using only a grid of circles, python

Question

I have to make a change to this specific code, which produces a square grid of circles, I have to change the code to make a triangle grid of circles.

import turtle
window = turtle.Screen()
my_boi = turtle.Turtle()
my_boi.speed(0)
for y in range(-200,200,50):
    for x in range(-200,200,50):
       my_boi.penup()
       my_boi.setposition(x,y)
       my_boi.pendown()
       my_boi.circle(20)
window.exitonclick()

score 2 · Answer 1 · answered Sep 11 '19 at 21:35

I'm sure there is a smarter approach, but this is one way to do it:

import turtle
window = turtle.Screen()
my_boi = turtle.Turtle()
my_boi.speed(0)

for (i,y) in enumerate(range(-200,200,50)):
    for x in range(-200+(25*i),200-(25*i),50):
       my_boi.penup()
       my_boi.setposition(x,y)
       my_boi.pendown()
       my_boi.circle(20)

window.exitonclick()

turtle.done()

In the second for-loop the range is iteratively decreased by 1/2 of the circle diameter in each side.

score 0 · Answer 2 · answered Sep 11 '19 at 22:52

I'd simplify things somewhat:

from turtle import Screen, Turtle

window = Screen()

my_boi = Turtle()
my_boi.speed('fastest')
my_boi.penup()

for y in range(1, 9):
    my_boi.setposition(-25 * y + 25, 50 * y - 250)

    for x in range(y):
        my_boi.pendown()
        my_boi.circle(20)
        my_boi.penup()
        my_boi.forward(50)

my_boi.hideturtle()
window.exitonclick()

Only the starting position of each row has to be calculated and placed via setposition(). The column positions can be a simple forward() statement.

Drawing a triangle using only a grid of circles, python

2 Answers2