# Tk_subtractive_color_mixing.py

# Tk_subtractive_color_mixing.py

from Tkinter import *
import time

t = Tk()
t.title("Subtractive Color Mixing")

frame1 = Frame(t)
frame1.pack()
frame2 = LabelFrame(t,text='L Side')
frame2.pack()
frame3 = LabelFrame(t,text='R Side')
frame3.pack()

Lcolor = (0,0,0)
Rcolor = (0,0,0)
subcolor = (0,0,0)
init = 0

canvas = Canvas(frame1, bg="gray", width=120*4+32, height=120*2)
canvas.pack()

def hx(rgb):
    return '#%02x%02x%02x' % rgb
def create():
    if init:
        try:
            canvas.create_rectangle((0, 0, 120, 120*2), fill=hx(Lcolor))
            canvas.create_rectangle((120, 0, 120*2, 120*2), fill=hx(subcolor))
            canvas.create_rectangle((120*2, 0, 120*3, 120*2), fill=hx(Rcolor))
        except:
            print subcolor
        canvas.create_rectangle((120*3, 0, 120*4+32, 120*2), fill='gray')
        y=10
        LMR=[Lcolor,subcolor,Rcolor]
        for i in list('LMR'):
            canvas.create_text(380, y, anchor=NW, text=i)
            canvas.create_text(400, y, anchor=NW, text='=    %s'% str(LMR.pop(0))); y+=20

def r1(event): global Lcolor; Lcolor = (int(event), Lcolor[1], Lcolor[2])
def g1(event): global Lcolor; Lcolor = (Lcolor[0], int(event), Lcolor[2])
def b1(event): global Lcolor; Lcolor = (Lcolor[0], Lcolor[1], int(event))
def r2(event): global Rcolor; Rcolor = (int(event), Rcolor[1], Rcolor[2])
def g2(event): global Rcolor; Rcolor = (Rcolor[0], int(event), Rcolor[2])
def b2(event): global Rcolor; Rcolor = (Rcolor[0], Rcolor[1], int(event))

LS = LabelFrame(t,text="L Side",height=20).pack()

s=Scale(frame2, from_=0, to=255, length=255*2, orient=HORIZONTAL, command=r1)
s.set(255); s.pack()
s=Scale(frame2, from_=0, to=255, length=255*2, orient=HORIZONTAL, command=g1)
s.set(255); s.pack()
Scale(frame2, from_=0, to=255, length=255*2, orient=HORIZONTAL, command=b1).pack()
Scale(frame3, from_=0, to=255, length=255*2, orient=HORIZONTAL, command=r2).pack()
Scale(frame3, from_=0, to=255, length=255*2, orient=HORIZONTAL, command=g2).pack()
s=Scale(frame3, from_=0, to=255, length=255*2, orient=HORIZONTAL, command=b2)
s.set(255); s.pack()

def mixColors(): ### ZZZ yellow + blue = (0,128,0)
    def rgbfix(R):
        aaa=(LC[R]*-1)+(RC[R])
        tmp=[0,1,2]; tmp.pop(R)
        bbb=LC[tmp[0]]+LC[tmp[1]]
        ccc=int((RC[tmp[0]]+RC[tmp[1]]))*-1
        tmp=abs(aaa+bbb+ccc)-637
        if tmp > 0: return tmp
        return 0

    LC,RC = Lcolor,Rcolor
    rgb = [(LC[0]+1)/2, (LC[1]+1)/2, (LC[2]+1)/2] # L
    rgb = [rgb[0]+((RC[0]+1)/2), rgb[1]+((RC[1]+1)/2), rgb[2]+((RC[2]+1)/2)] # R

    # color fix for mixing yellow and blue to correspondingly make green
    rgb = [rgb[0]-rgbfix(2),rgb[1],rgb[2]-rgbfix(2)]
    #print rgbfix(2)
    for i in range(3):
        if rgb[i] > 255: rgb[i] = 255
        elif rgb[i] < 0: rgb[i] = 0
    return rgb

SidesLR = ''
def run():
    global SidesLR, subcolor, init
    if SidesLR != Lcolor+Rcolor:
        subcolor = tuple(mixColors())
        SidesLR = Lcolor+Rcolor; create(); t.update()
        init = 1
    t.after(10, run)
#
run()
t.mainloop()