# Untitled

Mar 20th, 2020
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1. import turtle
2. import math
3.
4. window = turtle.Screen()
5. window.setup(1015, 768)
6. window.bgpic("images/background.png")
7. window.screensize(1015, 768)
8. # window.tracer(n=2)
9.
10. BASE_X, BASE_Y = 0, -300
11.
12. def calc_heading(x1, y1, x2, y2):
13.     dx = x2 - x1
14.     length = (dx ** 2 + (y2-y1) ** 2) ** 0.5
15.     cos_alpha = dx / length
16.     alpha = math.acos(cos_alpha)
17.     alpha = math.degrees(alpha)
18.     return alpha
19.
20. def fire_missile(x, y):
21.     missile = turtle.Turtle()
22.     missile.speed(0)
23.     missile.color('white')
24.     missile.penup()
25.     missile.setpos(x=BASE_X, y=BASE_Y)
26.     missile.pendown()
29.     missile.showturtle()
30.     # missile.forward(500)
31.     # missile.shape('circle')
32.     # missile.shapesize(2)
33.     # missile.shapesize(3)
34.     # missile.shapesize(4)
35.     # missile.shapesize(5)
36.     # missile.clear()
37.     # missile.hideturtle()
38.     our_missiles.append(missile)
39.     our_missiles_target.append(x, y)
40.
41.
42. window.onclick(fire_missile)
43.
44. our_missiles = []
45. our_missiles_target = []
46.
47. while True:
48.     window.update()
49.
50.     for num, missile in enumerate(our_missiles):
51.         missile.forward(4)
52.         target = our_missiles_target[num]
53.         if missile.distance(x=target[0], y=target[1]) < 20:
54.             missile.forward(500)
55.             missile.shape('circle')
56.             missile.shapesize(2)
57.             missile.shapesize(3)
58.             missile.shapesize(4)
59.             missile.shapesize(5)
60.             missile.clear()
61.             missile.hideturtle()
62.
63. Help me find the error in the code. Thanks in advance