Test out tk moving objects around on a canvas

tk_move.py

# File: tk_move.py
# Programmer: Jake Robinson
# Date: 07MAR2013

from Tkinter import *
import datetime
global x, y, start_time
x, y = 0, 0
start_time = datetime.datetime(100,1,1,11,34,59)


class App:
    def __init__(self, master):
        global x, y
        master.maxsize(400, 220)
        frame = Frame(master)
        frame.pack()
        self.canvas_frame = Frame(frame, width=200, height=200)
        self.canvas_frame.pack()
        
        self.canvas = Canvas(self.canvas_frame, width=100000, height=200,
                             scrollregion=(0,0,100000,0), bg='white')
        self.canvas.pack()
        for x in range(10):
            
            self.canvas.create_oval(50+(x*30), 50, 70+(x*30), 70,
                                    fill='black', tags='circle%s' % x)
        
        self.canvas.bind('<Control-Motion>', self.xy_motion)

        hbar=Scrollbar(frame,orient=HORIZONTAL)
        hbar.pack(side=BOTTOM,fill=X)
        hbar.config(command=self.canvas.xview)
        self.canvas.config(xscrollcommand=hbar.set)
        for ids in self.canvas.find_all():
            print self.canvas.gettags(ids)[0]
            print self.canvas.bbox(ids)

    
        self.canvas.bind('<ButtonPress-1>', self.test)
        self.canvas.bind('<ButtonRelease-1>', self.get_cords)

    def move_it(self, canvas, circle_id, x, y):
        old_cords = canvas.coords(circle_id)
        canvas.move(circle_id, x - (old_cords[0]+old_cords[2])/2,
                    y - (old_cords[1]+old_cords[3])/2)
        

    def get_cords(self, event):
        global circle_id
        canvas = event.widget
        x = canvas.canvasx(event.x)
        y = canvas.canvasy(event.y)
        self.move_it(canvas, circle_id, x, y)
        

    def xy_motion(self, event):
        global x, y, start_time
        canvas = event.widget
        x = canvas.canvasx(event.x)
        y = canvas.canvasy(event.y)
        self.canvas.delete('line')
        time = start_time + datetime.timedelta(microseconds=x*10000)
        mouse_line = self.canvas.create_line(x, 10, x, 190, tags='line')
        mouse_pos = self.canvas.create_text(x+10, 20, text=time,
                                            tags='line', anchor=W)

    def test(self, event):
        global circle_id
        canvas = event.widget
        x, y = canvas.canvasx(event.x), canvas.canvasy(event.y)
        an_id = canvas.find_overlapping(x, y, x, y)
        circle_id = an_id
    

root = Tk()
app = App(root)
root.mainloop()