from tkinter import *
from tkinter import colorchooser
from random import *

root = Tk()
#очистка
def clear_on_click(event):
    c.delete('all')

btn_clear = Button(width = 10, text = 'Clear', bg = 'lightgreen')
btn_clear.grid(row = 1, column = 6)
btn_clear.bind('<Button-1>', clear_on_click)

def btn_click(event):
    global color
    t = event.widget
    color = t['bg']

def rbtn_click(event):
    global color
    r = "%02x"%randint(0,255)
    g = "%02x"%randint(0,255)
    b = "%02x"%randint(0,255)
    color = '#'+r+g+b

#рандомный цвет

btn_random = Button(width = 10, text = 'Рандом', bg = 'darkblue')
btn_random.grid(row = 0, column = 7)
btn_random.bind('<Button-1>', rbtn_click)




colors = ['red', 'orange', 'yellow', 'green', 'cyan', 'blue', 'purple']
for i in range(7):#i = 0, 1, 2, 3, 4, 5, 6
    btn = Button(width = 10, bg = colors[i])
    btn.grid(row = 0, column = i)
    btn.bind('<Button-1>', btn_click)

c = Canvas(width = 600, height = 500, bg = 'white', cursor = 'pencil')
c.grid(row = 2, column = 0, columnspan = 7)

lastX = lastY = 0
t = 3
color = 'black'

def save_position(event):
    global lastX, lastY
    lastX = event.x
    lastY = event.y

def on_click(event):
    save_position(event)

def on_drag(event):
    c.create_line(lastX,lastY,event.x, event.y, fill = color, width = t)
    save_position(event)

c.bind('<Button-1>', on_click)
c.bind('<B1-Motion>', on_drag)