import turtle
import math
window = turtle.Screen()
window.setup(1200 + 3, 800 + 3)
window.bgpic('images/cosmos.png')
window.screensize(1200, 800)
BASE_X, BASE_Y = 0,-300
def calc_heading(x1, y1, x2, y2):
	import math
	dx = x2-x1	
	length = (dx ** 2 +(y2-y1) ** 2) ** 0.5
	cos_alpha = dx / length
	alpha = math.acos(cos_alpha)
	alpha = math.degrees(alpha)
	return alpha
def fire_missile(x, y):
	print(x,y)
	import turtle
	import math
	BASE_X, BASE_Y = 0,-300
	missile = turtle.Turtle()
	missile.color('red')
	missile.penup()
	missile.setpos(x=BASE_X, y=BASE_Y)
	missile.pendown()
	[b][u]heading = calc_heading(x1 = BASE_X, y1 = BASE_Y, x2 = x, y2 = y)[/u][/b]
	missile.setheading(heading)
	missile.forward(500)
	missile.shape('circle')
	missile.shapesize(2)
	missile.shapesize(3)
	missile.clear()
	missile.hideturtle()
window.onclick(fire_missile)
window.mainloop()