Рисовалка

from tkinter import *
from tkinter.colorchooser import *

root = Tk()
root.geometry("600x400")
root.title("Рисовалка")
root["bg"] = 'gray75'

canvas = Canvas(root, width=540, height=400, bg="white")
canvas.grid(row=0, column=0, rowspan=7)

state = "square"
brush = 10
color = "red"


def choose(input):
    global state, brush
    if input == "plus" and brush < 98:
        brush += 2
        size.configure(text=brush)
        return
    elif input == "minus" and brush > 0:
        brush -= 2
        size.configure(text=brush)
        return
    state = input


def ask_color(event):
    global color
    color_code = askcolor(title="Выбери цвет")
    color = color_code[1]
    size.configure(fg=color)


square_btn = Button(root, text="🟥", font=(None, 20), command=lambda: choose("square"))
square_btn.grid(row=0, column=1)
circle_btn = Button(root, text="🔴", font=(None, 20), command=lambda: choose("circle"))
circle_btn.grid(row=1, column=1)
line1_btn = Button(root, text=" ↘ ", font=(None, 20), command=lambda: choose("line1"))
line1_btn.grid(row=2, column=1)
line2_btn = Button(root, text=" ↙ ", font=(None, 20), command=lambda: choose("line2"))
line2_btn.grid(row=3, column=1)

plus_btn = Button(root, text="➕", font=(None, 20), command=lambda: choose("plus"))
plus_btn.grid(row=4, column=1)
minus_btn = Button(root, text="➖", font=(None, 20), command=lambda: choose("minus"))
minus_btn.grid(row=5, column=1)

size = Label(root, text=brush, fg=color, font=(None, 32))
size.grid(row=6, column=1)


def paint(event):
    if event.widget.__class__ is not Canvas:
        return
    if state == "circle":
        canvas.create_oval(event.x - brush, event.y - brush, event.x + brush, event.y + brush, fill=color, outline=color)
    elif state == "square":
        canvas.create_rectangle(event.x - brush, event.y - brush, event.x + brush, event.y + brush, fill=color, outline=color)
    elif state == "line1":
        canvas.create_line(event.x - brush, event.y - brush, event.x + brush, event.y + brush, fill=color)
    elif state == "line2":
        canvas.create_line(event.x + brush, event.y - brush, event.x - brush, event.y + brush, fill=color)


def erase(event):
    canvas.create_oval(event.x - brush * 2, event.y - brush * 2, event.x + brush * 2, event.y + brush * 2, fill="white", outline="white")


canvas.bind_all("<B1-Motion>", paint)
canvas.bind_all("<B3-Motion>", erase)

canvas.bind_all("<1>", paint)
canvas.bind_all("<3>", erase)
canvas.bind_all("<2>", ask_color)


root.mainloop()