#!/usr/bin/python

import serial, Tkinter

def zero():
    global ha, hb
    ha = []
    hb = []
zero()

w = Tkinter.Tk(className="Capslider"); w.wm_title("Cap Slider Demo");
w.wm_resizable(0,0)
sv = Tkinter.DoubleVar(w); tv = Tkinter.DoubleVar(w); uv = Tkinter.DoubleVar(w)
#s = Tkinter.Scale(w, from_=0, to_=100, variable=sv); s.pack()
#t = Tkinter.Scale(w, from_=0, to_=100, variable=tv); t.pack()
u = Tkinter.Scale(w, from_=0, to_=100, variable=uv, orient='h'); u.pack()
bu = Tkinter.Button(w, command=zero, text="zero"); bu.pack()

ser = serial.Serial("/dev/ttyUSB0", 115200)


def update():
    global la, lb, ha, hb

    line = ser.readline().split()
    if len(line) != 2:
        line = ser.readline().split()
    print line
    a, b = [int(i) for i in line]
    ha.append(a)
    hb.append(b)
    if len(ha) > 200: del ha[:50]
    if len(hb) > 200: del hb[:50]

    mina = min(ha); maxa = max(ha)
    minb = min(hb); maxb = max(hb)

    if maxa == mina: maxa = mina + 8
    if maxb == minb: maxb = minb + 8

    if mina != maxa:
        a = (a - mina) * 100.0 / (maxa - mina)
    else:
        a = 0

    if minb != maxb:
        b = (b - minb) * 100.0 / (maxb - minb)
    else:
        b = 0

    print a, b
    sv.set(a)
    tv.set(b)

    if a == 0 and b == 0:  # No data
        v = 50
        u.configure(sliderlength=u.winfo_width()-8)
    else:
        u.configure(sliderlength=25)
        if b == 0:
            v = 100
            u.configure(state='normal')
        elif a == 0:
            v = 0
            u.configure(state='normal')
        else:
            print "diff", a-b, a-b 
            v = 50 - 50 * (b-a)/max(a,b)
            u.configure(state='normal')
    uv.set(v)
    w.after(50, update)


update()
w.mainloop()