CODEWITHSUNDEEP
pythoncolorsturtle-graphics
pandaman
pandaman

Reputation: 3

How to add randomizing colors in my Turtle Graphic - Python

So I have this recursive graphic that works perfectly fine, but I was wondering for turtle graphics, and in my case how do I get each line segment to be a random color?

from turtle import *

def line(t, x1, y1, x2, y2):
    """draws the line segment from x1,y1 to x2,y2"""

    t.up()
    t.goto(x1, y1)
    t.down()
    t.goto(x2, y2)

def drawLine(t, x1, y1, x2, y2, level):
    """forms the shape"""

    if level == 0:
        line(t, x1, y1, x2, y2)
    else:
        xm = ((x1 + x2) + (y2 - y1)) // 2
        ym = ((y1 + y2) + (x1 - x2)) // 2
        drawLine(t, x1, y1, xm, ym, level-1)
        drawLine(t, xm, ym, x2, y2, level-1)

def main():
    """the main function"""

    myTurtle = Turtle()

    myTurtle.hideturtle()

    num = int(input("Please enter the number of levels: "))

    drawLine(myTurtle, 100, 0, 100, -200, num)


main()

Upvotes: 0

Views: 3239

Answers (2)

python_user
python_user

Reputation: 7123

You can get a random color triple using tuple(randint(0,255) for _ in range(3)) where randint is from random module. You can then call this function every time you draw a line t.pencolor(*get_rand_color()).

PS : colormode(255) must be set in the code for setting colors as tuples, now in theory you can get any of the 16.8 million colors possible.

from turtle import *
from random import randint
def line(t, x1, y1, x2, y2):
    """draws the line segment from x1,y1 to x2,y2"""

    t.up()
    t.goto(x1, y1)
    t.down()
    t.pencolor(*get_rand_color())
    t.goto(x2, y2)

def get_rand_color():
    """
    Returns a 3-tuple of random numbers in the range 0 - 255
    eg : (89, 103, 108)
    """
    return tuple(randint(0,255) for _ in range(3))


def drawLine(t, x1, y1, x2, y2, level):
    """forms the shape"""
    if level == 0:
        line(t, x1, y1, x2, y2)
    else:
        xm = ((x1 + x2) + (y2 - y1)) // 2
        ym = ((y1 + y2) + (x1 - x2)) // 2
        drawLine(t, x1, y1, xm, ym, level-1)
        drawLine(t, xm, ym, x2, y2, level-1)

def main():
    """the main function"""
    myTurtle = Turtle()
    myTurtle.hideturtle()
    colormode(255)
    num = 6
    drawLine(myTurtle, 100, 0, 100, -200, num)

main()

For level 5 this is how it looks like

For level 5 this is how it looks like

Edit : As @cdlane points out in comments, "colormode(255) must be set to specify colors as values in the range 0 - 255. By default, turtle's color mode uses values in the range 0.0 - 1.0 and they can be specified by a tuple: (0.5, 0.125, 0.333)".

In other words if you don't do colormode(255), you can change the get_rand_color function to return values in the range 0.0 to 1.0 instead of 0 to 255.

Upvotes: 0

Mike67
Mike67

Reputation: 11342

You can create a list of colors then use random.choice to pick a random color from the list when drawing each line.

Here is the code update

from turtle import *
import random

colors = ['red','green','blue','indianred','firebrick','ForestGreen'] # color list

def line(t, x1, y1, x2, y2):
    """draws the line segment from x1,y1 to x2,y2"""
    
    t.color(random.choice(colors))  # pick color from list
    t.up()
    t.goto(x1, y1)
    t.down()
    t.goto(x2, y2)

......

Output (10 levels)

Colors

Upvotes: 1

Related Questions