import Tkinter
from math import cos,sin
import time
tk = Tkinter
KOL = 10

class Canvas_1(tk.Frame):
    def __init__(self, master,kol):
        print kol
        self.master = master
        self.loc = self.dragged = 0
        tk.Frame.__init__(self, master)
        canvas = tk.Canvas(self, width =900, height =900,
            relief =tk.RIDGE, background ="white", borderwidth =1)
        x_center = 350
        y_center = 350
        r = 300
        s=0
        for i in range(1,kol+1,1):
            s=s+(360./kol)
            id=canvas.create_oval (x_center+r*sin(s)-5,y_center+r*cos(s)-5,x_center+r*sin(s)+5,y_center+r*cos(s)+5,
                                fill="red", tags ="DnD")
            
        canvas.pack (expand =1, fill =tk.BOTH)
        canvas.tag_bind ("DnD", "<ButtonPress-1>", self.down)
        canvas.tag_bind ("DnD", "<ButtonRelease-1>", self.up)
        canvas.tag_bind ("DnD", "<Enter>", self.enter)
        canvas.tag_bind ("DnD", "<Leave>", self.leave)
    def down (self, event):
        self.loc =1
        self.dragged =0
        event.widget.bind ("<Motion>", self.motion)

    def leave (self, event):
        self.loc =0
    
    def enter (self, event):
        self.loc =1
        self.up (event)

    def motion (self, event):
        root.config (cursor ="exchange")
        cnv = event.widget
        cnv.itemconfigure (tk.CURRENT, fill ="blue")
        x,y = cnv.canvasx(event.x), cnv.canvasy(event.y)
        got = event.widget.coords (tk.CURRENT, x-5, y-5, x+5, y+5)

    def up (self, event):
        event.widget.unbind ("<Motion>")
        event.widget.itemconfigure (tk.CURRENT, fill ="blue")
        print event.widget.itemcget(tk.CURRENT)
        self.master.update()
        time.sleep (.1)
        event.widget.itemconfigure (tk.CURRENT, fill ="green")
    
print sin(10)
kol = input()
root = tk.Tk()
root.title("Tkinter canvas...")
Canvas_1 (root,kol).pack()
root.mainloop()