# tk_morph.py

# tk_morph.py

import tkinter as tk
import math
import random

root = tk.Tk()
root.title("tk Morph")
root.geometry("%dx%d+0+0"%(600,600))
canvas = tk.Canvas(root, bg='black', width=600, height=600)
canvas.pack()

radius = 320
center_x, center_y = 300, 300
number_of_points = 16
morph_steps = 400

points = []
def plot():
    for i in range(number_of_points):
        angle = 2 * math.pi * i / number_of_points
        r = radius * random.uniform(0.2, 1)
        a = angle * random.uniform(0.95, 1)
        x = center_x + r * math.cos(a)
        y = center_y + r * math.sin(a)
        try:
            points[i] = (x, y)
        except:
            points.append((x, y))

plot()
prev_points = points[:]

def animate():
    plot()
    steps = []
    for i in range(number_of_points):
        x1, y1 = points[i]
        x2, y2 = prev_points[i]
        steps += [((x1-x2)/morph_steps, (y1-y2)/morph_steps)]
    for step in range(morph_steps):
        morph = []
        for i in range(number_of_points):
            x1, y1 = prev_points[i]
            x2, y2 = steps[i]
            morph += [(x1 + x2 * step, y1 + y2 * step)]
        canvas.delete('all')
        canvas.create_polygon(morph, smooth=True, fill='blue')
        canvas.update()
    prev_points[:] = points
    canvas.after(1, animate)

animate()
root.mainloop()