Draw any picture with plain circles

draw_with_circles.py

import gizeh as gz
from PIL import Image
import numpy as np

def draw_with_circles(image_path, min_r=2, max_r=10, skew=0.2,
                      padding=0.5, bg_color=(1, 1, 1),
                      draw_bg_color=False,
                      pdf_path=None, png_path=None):

    image = np.array(Image.open(image_path)) / 255.0
    height, width, _ = image.shape
    
    canvas = np.ones((height, width)) * max_r
    circles = []
    while True:
        free_xy = list(zip(*(canvas > min_r).nonzero()[::-1]))
        if free_xy == []:
            break
        x, y = xy = free_xy[np.random.randint(0, len(free_xy))]
        max_rad = canvas[y, x]
        r = min_r +  (max_rad - min_r) * np.random.rand()**skew
        circles.append((x, y, r, image[y, x]))
        xdist = (np.arange(width) - x)
        ydist = np.arange(height).reshape((height, 1)) - y
        distances = np.sqrt(xdist**2 + ydist**2)
        canvas = np.minimum(canvas, distances - r - padding)

    if pdf_path:
        surface = gz.PDFSurface(pdf_path, width, height, bg_color=bg_color)
        for (x, y, r, color) in circles:
            gz.circle(r, fill=color, xy=(x, y)).draw(surface)
        surface.finish()

    if png_path:
        surface = gz.Surface(width, height, bg_color=bg_color)
        for (x, y, r, color) in circles:
            gz.circle(r, fill=color, xy=(x, y)).draw(surface)
        surface.write_to_png(png_path)

for i in range(2):
    path = './tries/try_%03d' % i
    surface = draw_with_circles('./plain_logo.png', 
                                png_path=path + '.png',
                                pdf_path=path + '.pdf')