与另一个物体接触时改变物体颜色

Question

我一直在 youtube 上观看这个视频--https://www.youtube.com/watch?v=horBQxH0M5A 这会创建一个弹跳球列表。

我正在尝试更改代码，使一个球变为红色，其余球变为绿色，当红球 "touches" 变为绿球时，绿球将颜色变为红色。这并不难，但我还想确保当新的红球接触到另一个绿球时，那个绿球也会将其颜色变为绿色。

我所做的是创建一个红球和一个绿球列表：

import turtle
import random

wn = turtle.Screen()
wn.bgcolor("white")
wn.title("simulator")

wn.tracer(1, 1)
# red ball
rball = turtle.Turtle()
rball.shape("circle")
rball.color("red")
# rball.penup()
rball.speed(1)
x = random.randint(-10, 10)
y = random.randint(-12, 12)
rball.goto(x,y)

# green ball
gballlist = []
for _ in range(5):
    gballlist.append(turtle.Turtle())

for gballpeople in gballlist:
    gballpeople.shape("circle")
    gballpeople.color("green")
    gballpeople.speed(1)
    xh = random.randint(-10, 10)
    yh = random.randint(-12, 12)
    gballpeople.goto(xh, yh)

while True:
    wn.update()
    # rball.dy += acclerate
    rball.dy = random.randint(-2, 2)
    rball.dx = random.randint(-2, 2)
    rball.setx(rball.xcor() + rball.dx)
    rball.sety(rball.ycor() + rball.dy)
    # list = [-1, 1]
    # angel = random.choice(list)
    angel = -1
    if rball.xcor() < -100:
        rball.dx *= angel
    if rball.xcor() > 100:
        rball.dx *= angel
    if rball.ycor() < -100:
        rball.dy *= angel
    if rball.ycor() > 100:
        rball.dy *= angel

    for gball in gballlist:
        gball.dy = random.randint(-2, 2)
        gball.dx = random.randint(-2, 2)
        gball.setx(gball.xcor() + gball.dx)
        gball.sety(gball.ycor() + gball.dy)
        # list = [-1, 1]
        # angel = random.choice(list)
        angel = -1
        if gball.xcor() < -100:
            gball.dx *= angel
        if gball.xcor() > 100:
            gball.dx *= angel
        if gball.ycor() < -100:
            gball.dy *= angel
        if gball.ycor() > 100:
            gball.dy *= angel
# change the color when distance is near
        for gball in gballlist:
            if abs(rball.xcor() - gball.xcor()) < 4 and abs(rball.ycor() - gball.ycor()) < 4 :
                gball.color("red")

有什么建议吗？

Answer 1

您可以从绿色列表中删除绿色球并将其附加到红色球列表中。然后你必须将红色球附加到绿色列表并将其从红色列表中删除。

Answer 2

下面是我对您的程序的简化，我相信您正在尝试这样做。当你说：

I also want to make sure that when the new red ball touch the other green ball, the green ball will also change color to green.

我假设你的意思是：

... will also change color to red.

以下代码没有创建明确的列表，而是使用库自己的内部活动海龟列表，并使用海龟的颜色来确定它们碰撞时应该发生什么：

from turtle import Screen, Turtle
from random import randint

screen = Screen()
screen.title("Simulator")
screen.tracer(False)

for uninfected in range(10):
    ball = Turtle()
    ball.shape('circle')
    ball.shapesize(0.5)
    ball.color('green' if uninfected else 'red')
    ball.penup()
    ball.dy = randint(-2, 2)
    ball.dx = randint(-2, 2)
    x = randint(-180, 180)
    y = randint(-180, 180)
    ball.goto(x, y)

while True:
    for ball in screen.turtles():
        x, y = ball.position()

        x += ball.dx
        y += ball.dy

        ball.setposition(x, y)

        if x < -200:
            ball.dx *= -1
        elif x > 200:
            ball.dx *= -1

        if y < -200:
            ball.dy *= -1
        elif y > 200:
            ball.dy *= -1

        # change the color when distance is near

        changed = True

        while changed:
            changed = False

            for other in screen.turtles():
                if ball == other or ball.pencolor() == other.pencolor():
                    continue

                if ball.distance(other) <= 10:
                    ball.color('red')
                    other.color('red')
                    changed = True

    screen.update()

screen.mainloop()  # never reached

Answer 3

将代码的结尾部分更改为：

# change the color when distance is near
        for gball in gballlist:
            if abs(rball.xcor() - gball.xcor()) < 4 and abs(rball.ycor() - gball.ycor()) < 4 :
                if gball.color()[0] != 'red':
                    gball.color("red")
                else:
                    gball.color("green")

与另一个物体接触时改变物体颜色

Change object color upon contact with another object

python

turtle-graphics

将代码的结尾部分更改为：