Práctica #16: Programa usando el mouse

Código:

       
from Tkinter import *


canvas_width = 500
canvas_height = 150


def paint(event):
    x1,y1 =(event.x -1),(event.y -1)
    x2,y2 =(event.x +1),(event.y +1)
    panel.create_oval(x1,y1,x2,y2,fill = 'red')

def BorrarTodo():
    panel.delete('all')





master =Tk()
master.title('pinta con el mouse')
panel = Canvas(master,width=canvas_width,height=canvas_height)
panel.pack(expand = YES,fill = BOTH)
panel.bind("",paint)

mensaje =Label(master,text ='presione o arrastre con el mouse')
mensaje.pack(side=BOTTOM)

boton=Button(master,text ='borrar',command = BorrarTodo)
boton.pack(side = BOTTOM)

master.mainloop()