mvc

#!/usr/bin/env python
 
import wx
from math import sqrt
 
class Model:
    def __init__(self, callback):
        self._path = 0
	self._x = None
	self._y = None
	self._notify = callback
 
    def updatePos(self, x,y):
	if self._x is not None:
		self._path += sqrt( (x - self._x)**2 + (y - self._y)**2 )		
	self._x = x
	self._y = y
	self._notify()
 
    def path(self):
	return self._path
 
class View(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, title="Main View")
 
        sizer = wx.BoxSizer(wx.VERTICAL)
        self._mousePath = wx.TextCtrl(self)
        sizer.Add(wx.StaticText(self, label="Mouse Path"), 0, wx.EXPAND | wx.ALL)
        sizer.Add(self._mousePath, 0, wx.EXPAND | wx.ALL)
        self.SetSizer(sizer)
 
    def setPath(self, path):
        self._mousePath.SetValue(str(path))
 
class Controller:
    def __init__(self):
        self._model = Model(self._onUpdate)
        self._view = View()
        self._view.setPath(self._model.path())
 
        self._view.Bind(wx.EVT_MOTION, self.onMouseMotion)
        self._view.Show()
 
    def _onUpdate(self):
        self._view.setPath(self._model.path())
 
    def onMouseMotion(self, evt):
	self._model.updatePos(evt.GetX(), evt.GetY())
 
if __name__ == "__main__":
    app = wx.App(False)
    controller = Controller()
    app.MainLoop()