# Tk_Slither.py

# Tk_Slither.py

from Tkinter import *
import random
import time

WIDTH=HEIGHT=800
POPULATION=200

def randomColor():
    return "#%03x" % random.randint(0, 0xFFF)

def ball(x, y, r=10):
    return canvas.create_oval(x-r, y-r, x+r, y+r, fill=randomColor())

root=Tk()

canvas=Canvas(root, width=WIDTH, height=HEIGHT, bg="white")
canvas.pack()
root.wm_title("Slither")

balls=[]
for count in range(POPULATION):
    x=random.randint(0, WIDTH)
    y=random.randint(0, HEIGHT)
    balls.append(ball(x, y))

class Cv():
    x=y=xm=ym=0
cv=Cv()

def slither(event):
    cv.xm, cv.ym=event.x, event.y

canvas.bind("<Motion>", slither)
while 1:
    for t in range(POPULATION):
        objx,objy=canvas.coords(balls[t])[:2]

        if (t == 0):
            xv=0.7 * (cv.xm-objx)
            yv=0.7 * (cv.ym-objy)
        else:
            xv=0.7 * (cv.x-objx)
            yv=0.7 * (cv.y-objy)
        cv.x,cv.y=objx,objy
        canvas.move(balls[t], xv, yv)
    time.sleep(0.03)
    root.update()