英文:
Changing colors on turtle graphics on key press
问题
我在使用turtle编写代码时遇到了更改颜色的问题，使用colorsys库的hsv_to_rgb函数，除了色相(hue)之外，其他都设置好了。我为色相声明了一个变量，一切都很顺利，直到启动后，它只改变一次。以下是代码：
from turtle import *
from colorsys import *
pencolor('blue')
pensize(2)
bgcolor('black')
default_size = 0
h = 0
def move_up():
sety(ycor() + 50)
def move_left():
setx(xcor() - 50)
def move_right():
setx(xcor() + 50)
def move_down():
sety(ycor() - 50)
def change_color():
n = 0.1
c = hsv_to_rgb((h + n), 1, 1)
color(c)
def call_movement():
onkey(move_up, 'Up')
onkey(move_left, "Left")
onkey(move_right, "Right")
onkey(move_down, "Down")
listen()
def color_change():
onkey(change_color, "+")
listen()
call_movement()
color_change()
done()
我尝试使用while循环并将h的限制设置为1，它可以工作，但不符合我的预期，它循环进行，但我希望它只改变一次，然后将更改存储在变量中，以便在下次按键时使用，创建一种部分循环的效果。
英文:
I was writing a code on turtle and I got stuck in changing colors "onkey", using colorsys (hsv_to_rgb) with everything set but hue, I declared a variable for it. It was going all well till launch, it only changes once. Here's the code:
from turtle import *
from colorsys import *
pencolor('blue')
pensize(2)
bgcolor('black')
default_size = 0
h = 0
def move_up():
sety(ycor() + 50)
def move_left():
setx(xcor() - 50)
def move_right():
setx(xcor() + 50)
def move_down():
sety(ycor() - 50)
def change_color():
n = 0.1
c = hsv_to_rgb((h+n), 1, 1)
color(c)
def call_movement():
onkey(move_up, 'Up')
onkey(move_left, "Left")
onkey(move_right, "Right")
onkey(move_down, "Down")
listen()
def color_change():
onkey(change_color, "+")
listen()
call_movement()
color_change()
done()
I tried using while and set limit to h = 1, it works but not how I want it, it cycles but I want it to go once store the changes on the variable for the next time I use the key, creating a sort of a partial cycle or so
答案1
得分: 1
你没有设置h的值，所以它从未改变。
修复：
n = 0.1
...
def change_color():
global h
h += n
c = hsv_to_rgb(h, 1, 1)
color(c)
英文:
You are not ever setting the value of h, so it never changes.
Fix:
n = 0.1
...
def change_color():
global h
h += n
c = hsv_to_rgb(h, 1, 1)
color(c)
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