Python Turtle像素位置输出是指哪个部分？

Question

嘿，如果要复制游戏注释，这是代码，它还不完整。我有一个关于python Turtle“ yourtext.ycor（）或yourtext.xcor（）”的命令的简短问题。因此，我知道此命令将返回坐标位置，但是我相信它会返回中心位置，但我不确定（也许最左边或最右边的边缘？（我指的是此示例中的右桨） 。

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#Simple Pong in Python 3 for Beginners 
# By @TokyoEdTech
# Part 1: Getting Started

import turtle
import os


wn = turtle.Screen()
wn.title("Pong")
wn.bgcolor("orange")
wn.setup(width=800, height=600)
wn.tracer(0)
 
#Paddle A 

paddle_a = turtle.Turtle()
paddle_a.speed(0)
paddle_a.shape("square")
paddle_a.color("black")
paddle_a.shapesize(stretch_wid=5, stretch_len=1)
paddle_a.penup()
paddle_a.goto(-350,0)

#Paddle B 

paddle_b = turtle.Turtle()
paddle_b.speed(0)
paddle_b.shape("square")
paddle_b.color("black")
paddle_b.shapesize(stretch_wid=5, stretch_len=1)  #This means 100 Tall and 20 Wide so 1=20pix and so 5*20=100pix 
paddle_b.penup()
paddle_b.goto(350,0)

#Ball 
ball = turtle.Turtle()
ball.speed(0)
ball.shape("square")
ball.color("black")
ball.penup()
ball.goto(0,0)
ball.dx =  .2
ball.dy = .2 

#Function 
def paddle_a_up():
    y=paddle_a.ycor()
    y += 20
    paddle_a.sety(y)

def paddle_a_down():
    y=paddle_a.ycor()
    y -= 20
    paddle_a.sety(y)

def paddle_b_up():
    y=paddle_b.ycor()
    y += 20
    paddle_b.sety(y)

def paddle_b_down():
    y=paddle_b.ycor()
    y -= 20
    paddle_b.sety(y)

# Keyboard binding 
wn.listen()
wn.onkeypress(paddle_a_up,"w")
wn.onkeypress(paddle_a_down,"s")
wn.onkeypress(paddle_b_up,"Up")
wn.onkeypress(paddle_b_down,"Down")

#Main game Loop 
while True:
    wn.update()

#Move the Ball 
    ball.setx(ball.xcor() + ball.dx)
    ball.sety(ball.ycor() + ball.dy)

#BorderChecking
    if ball.ycor() > 290:
        ball.sety(290)
        ball.dy *= -1


    if ball.ycor() < -290:
        ball.sety(-290)
        ball.dy *= -1

    if ball.xcor() > 390:
        ball.goto(0,0)
        ball.dx*=-1

    if ball.xcor() < -390:
        ball.goto(0,0)
        ball.dx *= -1





#Paddle and Ball Collisions 

    if (ball.xcor() > 340 and ball.xcor() < 350) and (ball.ycor() < paddle_b.ycor() + 40 and ball.ycor() > paddle_b.ycor() -40):
        ball.setx(340)
        ball.dx *=-1

强的文本

Answer 1

我相信它会返回中心位置，但我不确定
（也许最左边或最右边的边缘？... ...
返回的号码是指像素位置。

我同意@jasonharper关于自定义形状（+1）的观点，但就内置形状而言，我认为这是对乌龟本身最好提出的问题：

from turtle import Screen, Turtle

RADIUS = 150
MAGNIFICATION = 4
FONT = ('Arial', 24, 'normal')

screen = Screen()
shapes = screen.getshapes()
angle = 360/len(shapes)

turtle = Turtle()
turtle.hideturtle()
turtle.shapesize(MAGNIFICATION)
turtle.penup()
turtle.sety(-RADIUS)

for shape in shapes:
    turtle.shape(shape)
    turtle.stamp()
    turtle.dot(MAGNIFICATION, 'red')

    turtle.right(90)
    turtle.forward(RADIUS/2)
    turtle.write(shape, align='center', font=FONT)
    turtle.backward(RADIUS/2)
    turtle.left(90)

    turtle.circle(RADIUS, extent=angle)

screen.exitonclick()

答案是内置的 -形状在热点的位置方面有所不同。至于您的桨，基于'Square'，热点是中心。