在Python乌龟游戏中检测碰撞

Question

我正在尝试制作一个Python游戏，其中红龟追逐蓝龟。当红色乌龟抓到蓝色乌龟时，我希望它在屏幕上说“碰撞”，但它不起作用。当它碰撞时，什么也没有发生，并且给我一个错误“
Turtle”对象不可调用”。

from turtle import Turtle, Screen

playGround = Screen()

playGround.screensize(250, 250)
playGround.title("Turtle Keys")

run = Turtle("turtle")
run.speed("fastest")
run.color("blue")
run.penup()
run.setposition(250, 250)

follow = Turtle("turtle")
follow.speed("fastest")
follow.color("red")
follow.penup()
follow.setposition(-250, -250)

def k1():
    run.forward(45)

def k2():
    run.left(45)

def k3():
    run.right(45)

def k4():
    run.backward(45)

def quitThis():
    playGround.bye()

def follow_runner():
    follow.setheading(follow.towards(run))
    follow.forward(8)
    playGround.ontimer(follow_runner, 10)

playGround.onkey(k1, "Up")  # the up arrow key
playGround.onkey(k2, "Left")  # the left arrow key
playGround.onkey(k3, "Right")  # you get it!
playGround.onkey(k4, "Down")

playGround.listen()

follow_runner()

def is_collided_with(self, run):
    return self.rect.colliderect(run.rect)

runner = run(10, 10, 'my_run')
follower = follow(20, 10)
if follow.is_collided_with(run):
    print 'collision!'

 playGround.mainloop()

Answer 1

与实际编程相比，这段代码似乎更让人想不到：

def is_collided_with(self, run):
    return self.rect.colliderect(run.rect)

runner = run(10, 10, 'my_run')
follower = follow(20, 10)
if follow.is_collided_with(run):
    print 'collision!'

乌龟没有.rect()方法。您不能is_collided_with()使用此def语句简单地将方法添加到现有类。没有run()和follow()功能。每次运动后，如果需要，该碰撞测试将只执行一次。让我们尝试挽救我们可以做的工作：

from turtle import Turtle, Screen

playGround = Screen()

playGround.screensize(250, 250)
playGround.title("Turtle Keys")

run = Turtle("turtle")
run.color("blue")
run.penup()
run.setposition(250, 250)

follow = Turtle("turtle")
follow.color("red")
follow.penup()
follow.setposition(-250, -250)

def k1():
    run.forward(45)

def k2():
    run.left(45)

def k3():
    run.right(45)

def k4():
    run.backward(45)

def quitThis():
    playGround.bye()

def is_collided_with(a, b):
    return abs(a.xcor() - b.xcor()) < 10 and abs(a.ycor() - b.ycor()) < 10

def follow_runner():
    follow.setheading(follow.towards(run))
    follow.forward(min(follow.distance(run), 8))

    if is_collided_with(follow, run):
        print('Collision!')
        quitThis()
    else:
        playGround.ontimer(follow_runner, 10)

playGround.onkey(k1, "Up")  # the up arrow key
playGround.onkey(k2, "Left")  # the left arrow key
playGround.onkey(k3, "Right")  # you get it!
playGround.onkey(k4, "Down")

playGround.listen()

follow_runner()

playGround.mainloop()

我根据乌龟光标的大小使用10作为碰撞半径，可以根据需要进行调整。该代码只是在游戏结束时给出一条消息，当发生碰撞时，您可能想做一些更复杂的事情。您可以考虑将碰撞逻辑设为自己的功能，以便在每次击键后使用，以防跑步者不小心撞到跟随者！