Tkinter, getting canvas-object, how?

[globalrev]

On 19 Apr, 10:15, Rafał Wysocki <rafal.wyso... at gmail.com> wrote:
> skanem... at yahoo.se napisa³(a):
>
>
>
> > so i load a gif onto a canvas and when i click the canvs i want to get
> > the color of the pixel that is clicked.
> > so i need to ge the object im clicking.
> > i was told in another thread to use find_withtag or find_closest but
> > it is not working, maybe im using the
> > method on the wrong object.
> > how do i do this?
> > and how do i then get specifics about that object, ie the pixel-color?
>
> > Exception in Tkinter callback
> > Traceback (most recent call last):
> >   File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
> >     return self.func(*args)
> >   File "C:\Users\saftarn\Desktop\pythonkod\mapexperiments
> > \mapgetobject.py", line 17, in callback
> >     undermouse=find_closest(master.CURRENT)
> > NameError: global name 'find_closest' is not defined
>
> > from Tkinter import *
>
> > master = Tk()
>
> > w = Canvas(master, width=400, height=625)
> > w.pack(expand = YES, fill = BOTH)
>
> > mapq = PhotoImage(file = 'C:\Users\saftarn\Desktop\Maps\provinces-of-
> > sweden.gif')
> > w.create_image(30, 30, image = mapq, anchor = NW)
>
> > def key(event):
> >     print "pressed", repr(event.char)
>
> > def callback(event):
> >     clobj=event.widget
> > ##    undermouse=find_withtag(master.CURRENT)
> >     undermouse=find_closest(master.CURRENT)
> >     print repr(undermouse)
>
> > w.bind("<Key>", key)
> > w.bind("<Button-1>", callback)
> > w.pack()
>
> > mainloop()
>
> from Tkinter import *
>
> master = Tk()
>
> w = Canvas(master, width=400, height=625)
> w.pack(expand = YES, fill = BOTH)
>
> mapq = PhotoImage(file = 'img.gif')
> _id = w.create_image(0, 0, image = mapq, anchor = NW)
>
> objects = {} # map id to object
> objects[_id] = mapq
>
> def key(event):
>     print "pressed", repr(event.char)
>
> def callback(event):
>     x, y = w.canvasx(event.x), w.canvasy(event.y) # Translates a
> window x,y coordinates to a canvas coordinate
>     _id = w.find_closest(x,y)[0] # Returns tuple containing the object
> id
>     obj = objects[_id]           # Finds object with given id
>     print 'color: %s' % obj.get(int(x), int(y))
>
> w.bind("<Key>", key)
> w.bind("<Button-1>", callback)
> w.pack()
>
> mainloop()

ty very much. however i dont get the %s really. is % a symbol and then
replaced by obj.get-values?
anyway when clicked i get 3values, but there is intx and inty only.
where does the 3rd value come from and how do i refer to it?