import Tkinter

class Scribble:
	
	def on_pressed(self, event):
		self.sx = event.x
		self.sy = event.y
		self.canvas.create_oval(self.sx, self.sy, event.x, event.y, outline = "red", width = 5)

	def on_dragged(self, event):
		self.canvas.create_line(self.sx, self.sy, event.x, event.y, fill = "red", width = 5)
		self.sx = event.x
		self.sy = event.y

	def save_image(self, event):
		self.canvas.postscript(file="outfile.ps")
		print "saved!"

	def renew(self):
		for n in self.canvas.find_all():
			self.canvas.delete(n)

	def __init__(self):
		window = Tkinter.Tk()
		self.canvas = Tkinter.Canvas(window, bg = "white", width = 300, height = 300)
		self.canvas.pack()
		quit_button = Tkinter.Button(window, text = "Exit", command = window.quit)
		quit_button.pack(side = Tkinter.RIGHT)

		renew_button = Tkinter.Button(window, text = "Renew", command = self.renew)
		renew_button.pack(side = Tkinter.RIGHT)

		self.canvas.bind("<ButtonPress-1>", self.on_pressed)
		self.canvas.bind("<B1-Motion>", self.on_dragged)
		self.canvas.bind("<ButtonPress-3>", self.save_image)

		window.mainloop()

Scribble()