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  1. import turtle
  2. import math
  3. import random
  4.  
  5. SCREEN_X = 1200
  6. SCREEN_Y = 800
  7.  
  8. window = turtle.Screen()
  9. window.bgpic('images/background.png')
  10. window.setup(1200 + 3, 800 + 3)
  11. window.screensize(SCREEN_X,SCREEN_Y)
  12. # window.tracer(n=2)
  13.  
  14. BASE_X, BASE_Y = 0, -300
  15.  
  16.  
  17. def calc_heading(x1,x2,y1,y2):
  18.     dx = x2 - x1
  19.     dy = y2 - y1
  20.     length = (dx ** 2 + (dy) ** 2) ** 0.5
  21.     cos_alpha = dx/length
  22.     alpha = math.acos(cos_alpha)
  23.     alpha = math.degrees(alpha)
  24.     if dy < 0:
  25.         alpha = - alpha
  26.     return alpha
  27.  
  28.  
  29. def fire_missile(x, y):
  30.     missile = turtle.Turtle(visible=False)
  31.     missile.speed(0)
  32.     missile.color('white')
  33.     missile.penup()
  34.     missile.setpos(x=BASE_X, y=BASE_Y)
  35.     missile.pendown()
  36.     heading = calc_heading(x1=BASE_X, x2=x, y1=BASE_Y, y2=y)
  37.     missile.setheading(heading)
  38.     missile.showturtle()
  39.     info = {'missile': missile, 'target': [x,y], 'state': 'launched', 'radius': 0}
  40.     our_missiles.append(info)
  41.  
  42. def fire_enemy_missile(x, y):
  43.     enemy_x = random.randint(-SCREEN_X/2, SCREEN_X/2)
  44.     enemy_y = SCREEN_Y/2
  45.     missile = turtle.Turtle(visible=False)
  46.     missile.speed(0)
  47.     missile.color('red')
  48.     missile.penup()
  49.     missile.setpos(x=enemy_x, y=enemy_y)
  50.     missile.pendown()
  51.     heading = calc_heading(x1=enemy_x, x2=x, y1=enemy_y, y2=y)
  52.     missile.setheading(heading)
  53.     missile.showturtle()
  54.     missile.forward(10)
  55.  
  56.     flare = turtle.Turtle(visible=True)
  57.     flare.color('#d000ff')
  58.     flare.shape('circle')
  59.     flare.shapesize(0.2)
  60.     flare.speed(0)
  61.     flare.penup()
  62.     flare.setpos(x=enemy_x, y=enemy_y)
  63.     flare.setheading(heading)
  64.  
  65.     info = {'missile': missile, 'target': [x,y], 'state': 'launched', 'radius': 0, 'flare': flare}
  66.     enemy_missiles.append(info)
  67.  
  68.  
  69. window.onclick(fire_missile)
  70.  
  71. our_missiles = []
  72. enemy_missiles = []
  73.  
  74. while True:
  75.     window.update()
  76.  
  77.     if len(enemy_missiles) < 5:
  78.         fire_enemy_missile(BASE_X, BASE_Y)
  79.  
  80.     for missile_info in our_missiles:
  81.         state = missile_info['state']
  82.         missile = missile_info['missile']
  83.         if state == 'launched':
  84.             missile.forward(4)
  85.             target = missile_info['target']
  86.             if missile.distance(x=target[0], y=target[1]) < 20:
  87.                 missile_info['state'] = 'explode'
  88.                 missile.shape('circle')
  89.         elif state == 'explode':
  90.             missile_info['radius'] += 1
  91.             missile.shapesize(missile_info['radius'])
  92.             if missile_info['radius'] > 5:
  93.                 missile_info['state'] = 'dead'
  94.                 missile.clear()
  95.                 missile.hideturtle()
  96.  
  97.     for missile_info in enemy_missiles:
  98.         state = missile_info['state']
  99.         missile = missile_info['missile']
  100.         flare = missile_info['flare']
  101.         if state == 'launched':
  102.             missile.forward(4)
  103.             flare.forward(4)
  104.             flare.shapesize(random.randint(1, 4)/10)
  105.             target = missile_info['target']
  106.             if missile.distance(x=target[0], y = target[1]) < 20:
  107.                missile_info['state'] = 'explode'
  108.                missile.shape('circle')
  109.         elif state == 'explode':
  110.             missile_info['radius'] += 1
  111.             missile.shapesize(missile_info['radius'])
  112.             if missile_info['radius'] > 5:
  113.                 missile_info['state'] = 'dead'
  114.                 missile.clear()
  115.                 missile.hideturtle()
  116.  
  117.     dead_our_missiles = [info for info in our_missiles if info['state'] == 'dead']
  118.     for dead in dead_our_missiles:
  119.         our_missiles.remove(dead)
  120.  
  121.     dead_enemy_missiles = [info for info in enemy_missiles if info['state'] == 'dead']
  122.     for dead in dead_enemy_missiles:
  123.         enemy_missiles.remove(dead)
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