我遇到了一個(gè)問題，即我射擊時(shí)敵方烏龜會(huì)停下來(lái)。我對(duì) python 比較陌生，所以我知道我的代碼很糟糕。我似乎無(wú)法發(fā)現(xiàn)為什么會(huì)發(fā)生這種情況，但我假設(shè)它與 while 循環(huán)有關(guān)。這是代碼：（我添加了注釋，因此很容易跳到其中的重要部分）import turtleimport os#wn is window#bp = borderbullet = 'ready'#screen setupwn = turtle.Screen()wn.bgcolor('black')wn.title('SPACE.INVADERS')#borderbp = turtle.Turtle()bp.speed(0)bp.color('green')bp.penup()bp.setposition(-300,-300)bp.pendown()count=0while count != 5: count= (count+1) bp.fd(600) bp.lt(90)bp.hideturtle()#playerp = turtle.Turtle()p.color('red')p.shape('triangle')p.penup()p.speed(0)p.setposition(0,-250)p.setheading(90)#enemye = turtle.Turtle()e.penup()e.speed(0)e.shape('square')e.shapesize(1.25,1.25)e.color('orange')e.setpos(-250,250)e.speed(1)#p = player#ps = player speedps = 15#moving left and rightdef left_mov(): x = p.xcor() x -= ps p.setx(x)def right_mov(): x = p.xcor() x += ps p.setx(x)#shootingdef shoot(): global bullet if bullet == 'ready': bullet = 'fire' shot= turtle.Turtle() shot.penup() shot.speed(0) shot.goto(p.pos()) shot.color('white') shot.shape('triangle') shot.shapesize(0.5) shot.lt(90) shot.speed(1) shot.fd(550) bullet = 'ready'#bindingsturtle.listen()turtle.onkey(left_mov, 'Left')turtle.onkey(right_mov, 'Right')turtle.onkey(shoot, 'space')#enemy movementwhile True: e.fd(500) e.rt(90) e.fd(25) e.rt(90) e.fd(500) e.lt(90) e.fd(25) e.lt(90)
1 回答
瀟湘沐
TA貢獻(xiàn)1816條經(jīng)驗(yàn) 獲得超6個(gè)贊
我假設(shè)它與 while 循環(huán)有關(guān)
是的，它不應(yīng)該在那里！在像烏龜這樣的事件驅(qū)動(dòng)的世界中，永遠(yuǎn)不應(yīng)該有while True:循環(huán)。相反，我們需要一個(gè)定時(shí)事件，它定期觸發(fā)，對(duì)運(yùn)動(dòng)中的對(duì)象（敵人和子彈）進(jìn)行增量更新，使它們看起來(lái)同時(shí)移動(dòng)。以下是我使用計(jì)時(shí)器事件重新編寫的代碼：
from turtle import Screen, Turtle
# moving left and right
def left_move():
player.setx(player.xcor() - player_speed)
def right_move():
player.setx(player.xcor() + player_speed)
# screen setup
screen = Screen()
screen.bgcolor('black')
screen.title('SPACE.INVADERS')
# border
border = Turtle(visible=False)
border.speed('fastest')
border.color('green')
border.penup()
border.setposition(-300, -300)
border.pendown()
for _ in range(4):
border.forward(600)
border.left(90)
# player
player = Turtle('triangle')
player.speed('fastest')
player.color('red')
player.penup()
player.setposition(0, -250)
player.setheading(90)
player_speed = 15
# enemy
enemy = Turtle('square')
enemy.speed('fast')
enemy.shapesize(1.25)
enemy.color('orange')
enemy.penup()
enemy.setpos(-250, 250)
enemy_speed = 6 # enemy speed
enemy_direction = 1 # enemy direction
# bullet
bullet = Turtle('triangle', visible=False)
bullet.speed('fastest')
bullet.color('white')
bullet.shapesize(0.5)
bullet.penup()
bullet.left(90)
bullet_speed = 9 # bullet speed
# shooting
def shoot():
if not bullet.isvisible():
bullet.goto(player.position())
bullet.showturtle()
def move():
global enemy_direction
if bullet.isvisible():
if bullet.ycor() > 275:
bullet.hideturtle()
else:
bullet.forward(bullet_speed)
# enemy movement
enemy.forward(enemy_direction * enemy_speed)
enemy.settiltangle(enemy.tiltangle() + 3) # just for fun
x, y = enemy.position()
if x > 250 or x < -250:
enemy_direction *= -1
enemy.sety(y - 25)
screen.ontimer(move, 50)
# bindings
screen.onkey(left_move, 'Left')
screen.onkey(right_move, 'Right')
screen.onkey(shoot, 'space')
screen.listen()
move()
screen.mainloop()
這應(yīng)該為您提供前進(jìn)所需的基本功能，并添加碰撞檢測(cè)（子彈到敵人、敵人到玩家、玩家到墻壁）和得分。
另請(qǐng)注意，海龜是全局實(shí)體，因此每次需要時(shí)都創(chuàng)建一個(gè)新項(xiàng)目符號(hào)是一個(gè)壞主意。即使您最終允許重疊項(xiàng)目符號(hào)，也要為此目的保留一組可重復(fù)使用的項(xiàng)目符號(hào)。
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