def goto(self,newx):

        self.xgoal=newx

    def ismoving(self):

        return not self._stopped

class FlyingFader(Frame):

    def __init__(self, master, variable, label, fadedur=1.5, font=('Arial', 8), labelwidth=12,

                 **kw):

        Frame.__init__(self, master)

        self.name = label

        self.variable = variable

        self.mass = Mass()

        self.config({'bd':1, 'relief':'raised'})

        scaleopts = {'variable' : variable, 'showvalue' : 0, 'from' : 1.0,

                     'to' : 0, 'res' : 0.001, 'width' : 20, 'length' : 200, 'orient':'vert'}

        scaleopts.update(kw)

        if scaleopts['orient']=='vert':

            side1=TOP

            side2=BOTTOM

        else:

            side1=RIGHT

            side2=LEFT

        self.scale = Scale(self, scaleopts)

        self.vlabel = Label(self, text="0.0", width=6, font=font)

        self.label = Label(self, text=label, font=font, anchor='w',width=labelwidth) #wraplength=40, )

        self.oldtrough = self.scale['troughcolor']

        self.scale.pack(side=side2, expand=1, fill=BOTH, anchor='c')

        self.vlabel.pack(side=side2, expand=0, fill=X)

        self.label.pack(side=side2, expand=0, fill=X)

        for k in range(1, 10):

            self.scale.bind("<Key-%d>" % k, 

                lambda evt, k=k: self.newfade(k / 10.0, evt))

        self.scale.bind("<Key-0>", lambda evt: self.newfade(1.0, evt))

        self.scale.bind("<grave>", lambda evt: self.newfade(0, evt))

        self.scale.bind("<1>", self.cancelfade)

        self.scale.bind("<2>", self.cancelfade)

        self.scale.bind("<3>", self.mousefade)

    def cancelfade(self, evt):

        self.fadegoal = self.variable.get()

        self.fadevel = self.fadeacc = 0

        self.scale['troughcolor'] = self.oldtrough

    def mousefade(self, evt):

        target = float(self.tk.call(self.scale, 'get', evt.x, evt.y))

        self.newfade(target, evt)

    def ismoving(self):

        return self.fadevel!=0 or self.fadeacc!=0

    def newfade(self, newlevel, evt=None, length=None):

        # these are currently unused-- Mass needs to accept a speed input

        mult = 1

        if evt.state & 8 and evt.state & 4: mult = 0.25 # both

        elif evt.state & 8: mult = 0.5 # alt

        elif evt.state & 4: mult = 2   # control

        self.mass.x = self.variable.get()

        self.mass.goto(newlevel)

        self.gofade()

    def gofade(self):

        self.mass.update()

        self.variable.set(self.mass.x)

        if not self.mass.ismoving():

            self.scale['troughcolor'] = self.oldtrough

            return

        # blink the trough while the thing's moving

        if time()%.4>.2:

            # self.scale.config(troughcolor=self.oldtrough)

            self.scale.config(troughcolor='orange')

        else:

            # self.scale.config(troughcolor='white')

            self.scale.config(troughcolor='yellow')

#        colorfade(self.scale, percent)

        self.after(30, self.gofade)

    def updatelabel(self, *args):