Create a Voronoi diagram as a raster image in Python. Converted from PIL to DrawBot.

voronoi-drawbot-example.py

# http://forum.drawbot.com/topic/148/voronoi-fun/2

import random
import math
 
def generate_voronoi_diagram(imgx, imgy, num_cells):

    nx = []
    ny = []
    nr = []
    ng = []
    nb = []

    for i in range(num_cells):
        nx.append(random.randrange(imgx))
        ny.append(random.randrange(imgy))
        nr.append(random.random())
        ng.append(random.random())
        nb.append(random.random())

    im = ImageObject()

    with im:
        size(imgx, imgy)

        for y in range(imgy):
            for x in range(imgx):
                dmin = math.hypot(imgx-1, imgy-1)
                j = -1
                for i in range(num_cells):
                    d  = math.hypot(nx[i]-x, ny[i]-y)
                    if d < dmin:
                        dmin = d
                        j = i
            
                fill(nr[j], ng[j], nb[j])
                rect(x, y, 1, 1)

    image(im, (0, 0))
    
size(200, 200) 
generate_voronoi_diagram(width(), height(), 7)
saveImage("VoronoiDiagram.png")