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- import math
- import turtle
- window = turtle.Screen()
- window.setup(900 + 3, 600 + 3)
- window.bgpic("image/background1.png")
- window.screensize(900, 600)
- #window.tracer(n=0)
- BASE_X, BASE_Y = 0, -300
- def calc_heading(x1, y1, x2, y2):
- dx = x2 - x1
- dy = y2 - y1
- length = (dx ** 2 + (dy) ** 2) ** 0.5
- cos_alpha = dx / length
- alpha = math.acos(cos_alpha)
- alpha = math.degrees(alpha)
- if dy <0:
- alpha=-alpha
- return alpha
- def fire_missile(x, y):
- missile = turtle.Turtle()
- missile.hideturtle()
- missile.speed(0)
- missile.color('white')
- missile.penup()
- missile.setpos(x=BASE_X, y=BASE_Y)
- missile.pendown()
- heading = calc_heading(x1=BASE_X, y1=BASE_Y, x2=x, y2=y)
- missile.setheading(heading)
- missile.showturtle()
- info={'missile':missile,'target':[x,y],'state':'launched','radius':0}
- our_missiles.append(info)
- window.onclick(fire_missile)
- our_missiles = []
- while True:
- window.update()
- for info in our_missiles:
- state=info['state']
- missile = info['missile']
- if state == 'launched':
- missile.forward(4)
- target = info['target']
- if missile.distance(x=target[0], y=target[1]) < 20:
- info['state'] = 'explode'
- missile.shape('circle')
- elif state == 'explode':
- info['radius']+=1
- if info['radius']>5:
- missile.clear()
- missile.hideturtle()
- info['state'] = 'dead'
- else:
- missile.shapesize(info['radius'])
- dead_missiles = [info for info in our_missiles if info['state'] == 'dead']
- for dead in dead_missiles:
- our_missiles.remove(dead)
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