# Tk_basic_paint_demo2.py

# Tk_basic_paint_demo2.py

from Tkinter import *
root = Tk()
root.geometry("500x500")

h = Scrollbar(root, orient=HORIZONTAL)
v = Scrollbar(root, orient=VERTICAL)
canvas = Canvas(root, scrollregion=(0, 0, 1000, 1000), yscrollcommand=v.set, xscrollcommand=h.set)
h['command'] = canvas.xview
v['command'] = canvas.yview

canvas.grid(column=0, row=0, sticky=(N,W,E,S))
h.grid(column=0, row=1, sticky=(W,E))
v.grid(column=1, row=0, sticky=(N,S))
root.grid_columnconfigure(0, weight=1)
root.grid_rowconfigure(0, weight=1)

lastx, lasty = 0, 0

import PIL.ImageGrab
def xy(event):
    global lastx, lasty, xyColor
    lastx, lasty = canvas.canvasx(event.x), canvas.canvasy(event.y)
    rgb = PIL.ImageGrab.grab().load()[event.x, event.y]
    print "Clicked at: ", event.x, event.y
    if event.x > 10 and event.x < 30 and event.y > 10 and event.y < 30+y:
        #xyColor = '#%02x%02x%02x' % rgb ### ???
        print colors[(event.y-10)/25]
        xyColor = colors[(event.y-10)/25]
        pass

def addLine(event):
    global lastx, lasty
    x, y = canvas.canvasx(event.x), canvas.canvasy(event.y)
    if event.x > 40:
        canvas.create_line((lastx, lasty, x, y), fill=xyColor, width=5, tags='currentline')
        lastx, lasty = x, y
    else: lastx, lasty = 40, y

def doneStroke(event):
    canvas.itemconfigure('currentline', width=1)

canvas.bind("<Button-1>", xy)
canvas.bind("<B1-Motion>", addLine)
canvas.bind("<B1-ButtonRelease>", doneStroke)

colors = 'red orange yellow green blue purple pink brown white grey black'.split()

y=0
for c in colors:
    id = canvas.create_rectangle((10, 10+y, 30, 30+y), fill=c)
    y+=25

xyColor='red'
canvas.itemconfigure('palette', width=5)
root.mainloop()