[英]Re-Running a turtle program
我制作了一个简单的 python 程序,该程序使用海龟模块创建随机生成的螺旋。 我在 python 还是很新的,我想知道在海龟离中心很远并且螺旋完成后如何重新启动程序。 这是我的代码:
import turtle
import random
root = turtle.Screen()
turtle = turtle.Turtle()
colors = ["yellow", "gold", "orange", "red", "maroon", "violet", "magenta", "purple", "navy", "blue", "skyblue", "cyan", "turquoise", "lightgreen", "green", "darkgreen", "chocolate", "brown", "gray", "white"]
def spiral():
endColors = [random.choice(colors), random.choice(colors), random.choice(colors)]
angle = random.randint(60, 300)
distance = turtle.distance(0, 0)
print("Colors used are:", endColors)
print("The turning angle is: ", angle, "deg")
print("The distance is: ", distance)
turtle.speed(0)
turtle.hideturtle()
root.bgcolor("black")
for i in range(2000):
turtle.forward(i)
turtle.right(angle)
turtle.color(endColors[i%3])
root.mainloop()
spiral()
我曾尝试在 if 语句中使用 turtle.distance function 但它不起作用。
您可以通过使用全局标志变量并安装一个调用 function 的海龟计时器来做到这一点,该计时器通过查看变量定期检查螺旋是否已完成绘制 - 如果是,则重置并绘制另一个。 在名为check_status()
的 function 下面的代码中。 我还在每个完成后添加了一个短暂的停顿,以使其保持可见足够长的时间以供欣赏。 ;¬)
import random
import time
import turtle
root = turtle.Screen()
turtle = turtle.Turtle()
colors = ["yellow", "gold", "orange", "red", "maroon", "violet", "magenta",
"purple", "navy", "blue", "skyblue", "cyan", "turquoise", "lightgreen",
"green", "darkgreen", "chocolate", "brown", "gray", "white"]
MAX_DIST = 100
PAUSE = 2 # Secs
def spiral():
global spiral_done
spiral_done = False # Global flag.
endColors = [random.choice(colors), random.choice(colors), random.choice(colors)]
angle = random.randint(60, 300)
print("Colors used are:", endColors)
print("The turning angle is: ", angle, "deg")
turtle.speed(0)
turtle.hideturtle()
root.bgcolor("black")
for i in range(2000):
turtle.forward(i)
turtle.right(angle)
turtle.color(endColors[i%3])
if turtle.distance(0, 0) > MAX_DIST: # Stop if far away.
break
time.sleep(PAUSE)
spiral_done = True
def check_status():
if spiral_done:
root.reset()
spiral() # Draw another.
root.ontimer(check_status, 250) # Check every 1/4 second.
def main():
global spiral_done
spiral_done = True # Initialize global flag.
check_status() # Start watching its value.
spiral()
root.mainloop()
if __name__ == '__main__':
main()
我的解决方案类似于@martineau,除了我使用turtle.reset()
而不是screen.reset( screen.reset()
和更简单的时序逻辑:
from turtle import Screen, Turtle
from random import choice, randint
from itertools import count
COLORS = [
'yellow', 'gold', 'orange', 'red', 'maroon',
'violet', 'magenta', 'purple', 'navy', 'blue',
'skyblue', 'cyan', 'turquoise', 'lightgreen', 'green',
'darkgreen', 'chocolate', 'brown', 'gray', 'white'
]
RADIUS = 100
def spiral():
turtle.hideturtle()
turtle.speed('fastest')
triColors = [choice(COLORS), choice(COLORS), choice(COLORS)]
angle = randint(60, 300)
print("Colors used are:", triColors)
print("The turning angle is: ", angle, "deg")
print("The radius is: ", RADIUS)
for distance in count(): # spiral forever until a specific radius is achieved
turtle.pencolor(triColors[distance % 3])
turtle.forward(distance)
if turtle.distance(0, 0) > RADIUS:
break
turtle.right(angle)
turtle.reset()
screen.ontimer(spiral)
screen = Screen()
screen.bgcolor('black')
turtle = Turtle()
spiral()
screen.mainloop()
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