I think you will be better off using a Canvas to hold your image(s) rather than a Label. You can then place 'hotspots' over the diagram and bind events to them. eg. something like:
from tkinter import *
class App():
def __init__(self):
self.root = Tk()
self.messages = {}
self.canvas = Canvas(self.root, bd=0, highlightthickness=0)
self.image = PhotoImage(file='2.gif')
self.canvas.create_image(0,0, image=self.image, anchor='nw')
w,h = self.image.width(), self.image.height()
self.canvas.config(width=w, height=h)
self.canvas.pack()
self.balloon = b = Toplevel(self.root)
b.withdraw()
b.wm_overrideredirect(1)
self.msg = Label(b, bg='black', fg='yellow', bd=2, text='')
self.msg.pack()
self.set_up_hotspots()
def set_up_hotspots(self):
box1 = self.canvas.create_polygon(50,100,100,100,100,150,50,150,
outline='blue', fill='')
#note: outline can be '' also ;)
self.messages[box1] = "The machine head consists of a "\
"Flynn mechanism,\na Demmel crank, "\
"and a heavy-duty frobulator. "
box2 = self.canvas.create_polygon(150,100,200,100,200,150,150,150,
outline='red', fill='')
self.messages[box2] = "And now for something completely different"
for item in [box1, box2]:
for event, handler in [('<Enter>', self.on_hotspot_enter),
('<Leave>', self.on_hotspot_leave)]:
self.canvas.tag_bind(item, event, handler)
def on_hotspot_enter(self, event):
if not self.balloon.winfo_ismapped():
txt = self.messages[event.widget.find_withtag('current')[0]]
self.msg.config(text=txt)
x,y = event.x_root, event.y_root
self.balloon.geometry('+%d+%d' %(x+16,y))
self.balloon.deiconify()
def on_hotspot_leave(self, event):
if self.balloon.winfo_ismapped():
self.balloon.withdraw()
if __name__ == "__main__":
app = App()
app.root.mainloop()