def setup():
    size(500, 500)
    generate_voronoi_diagram(width, height, 25)
    saveFrame("VoronoiDiagram.png")

def generate_voronoi_diagram(w, h, num_cells):
    nx, ny, nr, ng, nb = [], [], [], [], []
    for i in range(num_cells):
        nx.append(int(random(w)))
        ny.append(int(random(h)))
        nr.append(int(random(256)))
        ng.append(int(random(256)))
        nb.append(int(random(256)))
    for y in range(h):
        for x in range(w):
            dmin = dist(0, 0, w - 1, h - 1)
            j = -1
            for i in range(num_cells):
                d = dist(0, 0, nx[i] - x, ny[i] - y)
                if d < dmin:
                    dmin = d
                    j = i
            set(x, y, color(nr[j], ng[j], nb[j]))