from tkinter import *
from tkinter import colorchooser

color = 'black'
r = 5

def create_brush(event):
    x = event.x
    y = event.y
    x1 = int(x) + r
    y1 = int(y) + r
    brush = canvas.create_oval(x, y, x1, y1, tag='brush', fill=color, width=0, outline=color)

def start_paint():
    global canvas
    canvas = Canvas(window_main, width=1440, height=900)
    canvas.pack()
    canvas.bind('<B1-Motion>', create_brush)


def get_color():
    global color
    color = colorchooser.askcolor()[1]


def new_list():
    canvas.delete(ALL)

def weight_line():
    global r
    r = 20

def main():
    global window_main
    window_main = Tk()
    window_main.attributes('-fullscreen', True)
    start_paint()
    button_quit = Button(window_main, width=12, height=2, text='Выход', bg='red', fg='black', command = lambda: window_main.destroy())
    button_quit.place(x=0, y=0)
    button_weight = Button(window_main, width=12, height=2, text='Толщина Кисти', bg='red', fg='black', command=weight_line)
    button_weight.place(x=94, y=0)
    button_color = Button(window_main, width=12,height=2, text='Цвет', bg='red', fg='black', command=get_color)
    button_color.place(x=188, y=0)
    button_newlist = Button(window_main, width=12,height=2, text='Новый лист', bg='red', fg='black', command=new_list)
    button_newlist.place(x=282, y=0)
    window_main.mainloop()


if __name__ == '__main__':
    main()