# Z miško "vlečemo" (dragging) element po Canvasu
import tkinter

class Krogec():
    def __init__(self, master):
        self.canvas = tkinter.Canvas(master, width=300, height=300)
        self.canvas.pack()
        for i in range(10):
            self.canvas.create_line(0, 0, i * 10, 300)
        self.krogec = self.canvas.create_oval(140,140,160,160, fill="red")
        self.canvas.bind("<ButtonPress-1>", self.gumb_dol)
        self.canvas.bind("<ButtonRelease-1>", self.gumb_gor)
        self.canvas.bind("<Motion>", self.premik_miske)
        self.krogec_premikamo = False

    def gumb_dol(self, event):
        # Naročimo se na premike miške
        (x,y) = (event.x, event.y)
        ids = self.canvas.find_overlapping(x-3,y-3,x+3,y+3)
        print ("Našli smo {0}, krogec = {1}".format(ids, self.krogec))
        self.krogec_premikamo = (self.krogec in ids)

    def gumb_gor(self, event):
        # Odnaročimo se od premikov miške
        self.krogec_premikamo = False

    def premik_miske(self, event):
        if self.krogec_premikamo:
            (x, y) = (event.x, event.y)
            self.canvas.coords(self.krogec, x-10, y-10, x+10, y+10)

# Glavni program
root = tkinter.Tk()
app = Krogec(root)
root.mainloop()