#
# hello.reflect.45.py
#
# receive and display synchronous light reflection 
# hello.light.45.py serial_port
#
# Neil Gershenfeld
# CBA MIT 10/25/12
#
# (c) Massachusetts Institute of Technology 2012
# Permission granted for experimental and personal use;
# license for commercial sale available from MIT
#

from Tkinter import *
import serial
from PIL import Image, ImageTk, ImageEnhance

WINDOW = 0 # window size
eps = 0.9 # filter time constant
filter = 0.0 # filtered value
nloop = 100.0 # number of loops accumulated
amp = 25.0 # difference amplitude
value = 0.0 #brightness value
value1 = 0.0

class Enhance(Frame):
    def __init__(self, master, image, name, enhancer, lo, hi):
        Frame.__init__(self, master)
   
       
        # set up the image
        self.tkim = ImageTk.PhotoImage(image.mode, image.size)
        self.enhancer = enhancer(image)
        self.update("1.0") # normalize

        # image window
        Label(self, image=self.tkim).pack()

        #scale
        s = Scale(self, label=name, orient=HORIZONTAL,
                  from_=lo, to=hi, resolution=0.01,
                  command=self.update)
        #s.set(self.value)
        s.pack()
	


    def update(self, value):
        #self.value = eval(value)
        print (value1)
        self.tkim.paste(self.enhancer.enhance(value1))

def idle(parent,canvas):
   global filter, eps, value1
   #
   # idle routine
   #
   byte2 = 0
   byte3 = 0
   byte4 = 0
   ser.flush()
   while 1:
      #
      # find framing 
      #
      byte1 = byte2
      byte2 = byte3
      byte3 = byte4
      byte4 = ord(ser.read())
      if ((byte1 == 1) & (byte2 == 2) & (byte3 == 3) & (byte4 == 4)):
         break
   on_low = ord(ser.read())
   on_high = ord(ser.read())
   on_value = (256*on_high + on_low)/nloop
   
   off_low = ord(ser.read())
   off_high = ord(ser.read())
   off_value = (256*off_high + off_low)/nloop
   
   filter = (1-eps)*filter + eps*amp*(on_value-off_value)+14
  # x = int(.25*WINDOW + (.9-.25)*WINDOW*filter/1024.0)
  # canvas.itemconfigure("text_diff",text="diff %.1f"%filter)
  # canvas.coords('rect1_diff',.25*WINDOW,.45*WINDOW,x,.6*WINDOW)
  # canvas.coords('rect2_diff',x,.45*WINDOW,.9*WINDOW,.6*WINDOW)
   if filter < 0 : filter = 0
   filter = filter/80
   value1 = filter-1
   canvas.update()
   parent.after_idle(idle,parent,canvas)
  
   
#
#  check command line arguments
#
if (len(sys.argv) != 2):
   print "command line: hello.light.45.py serial_port"
   sys.exit()
port = sys.argv[1]
#
# open serial port
#
ser = serial.Serial(port,9600)
ser.setDTR()
#
# set up GUI
#
root = Tk()
root.title('Brightness (q to exit)')
root.bind('q','exit')
canvas = Canvas(root, width=WINDOW, height=.65*WINDOW, background='white')
#
im = Image.open("lenna.jpg")
im.thumbnail((600, 600))

#canvas.create_text(.125*WINDOW,.525*WINDOW,text=".33",font=("Helvetica", 24),tags="text_diff",fill="#0000b0")
canvas.pack()
#
# start idle loop
#
Enhance(root, im, "Brightness", ImageEnhance.Brightness, -1.0, 3.0).pack()
root.after(100,idle, root, canvas)
root.mainloop()