# Tk_drag_objects.py

# Tk_drag_objects.py

from Tkinter import *
root=Tk()
canvas=Canvas(root)

_drag_data={"x": 0, "y": 0, "item": None, "color": None, "OLcolor": None}

def obj_ButtonPress(event):
    _drag_data["item"]=canvas.find_closest(event.x, event.y)[0]
    _drag_data["x"]=event.x
    _drag_data["y"]=event.y
    _drag_data["color"]=canvas.itemcget(_drag_data["item"], "fill")
    _drag_data["OLcolor"]=canvas.itemcget(_drag_data["item"], "outline")
    canvas.itemconfig(_drag_data["item"], outline="black", fill="grey")
    canvas.tag_raise(_drag_data["item"])

def obj_ButtonPress2(event):
    _drag_data["item"]=canvas.find_closest(event.x, event.y)[0]
    canvas.tag_lower(_drag_data["item"])

def obj_ButtonRelease(event):
    canvas.itemconfig(_drag_data["item"], fill=_drag_data["color"])
    canvas.itemconfig(_drag_data["item"], outline=_drag_data["OLcolor"])

def obj_Motion(event):
    delta_x=event.x - _drag_data["x"]
    delta_y=event.y - _drag_data["y"]
    canvas.move(_drag_data["item"], delta_x, delta_y)
    _drag_data["x"]=event.x
    _drag_data["y"]=event.y

def _create_token_(coord, color):
    (x,y)=coord
    canvas.create_oval(x-30, y-30, x+30, y+30,
                            outline=color, fill=color, tags="obj_")

canvas.create_rectangle(0,100, 200, 200, outline='yellow', fill='yellow', tags="obj_")
canvas.create_oval(0,0, 100,100, outline='red', fill='red', tags="obj_")
canvas.create_polygon(111,50, 200,0, 200,100, outline='green', fill='green', tags="obj_")

_create_token_((100, 100), "purple")
_create_token_((200, 100), "black")

canvas.tag_bind("obj_", "<ButtonPress-1>", obj_ButtonPress)
canvas.tag_bind("obj_", "<ButtonPress-3>", obj_ButtonPress2)
canvas.tag_bind("obj_", "<ButtonRelease-1>", obj_ButtonRelease)
canvas.tag_bind("obj_", "<B1-Motion>", obj_Motion)

canvas.pack()

root.mainloop()