用Python递归绘制爱心树代码
import turtle
import random
# 设置画笔
turtle.speed(0)
turtle.bgcolor('black')
turtle.color('red')
turtle.pensize(4)
# 树干函数
def trunk(branch_length):
if branch_length > 5:
# 每次树枝的长度减小，但不需要递归
turtle.forward(branch_length)
turtle.right(20)
trunk(branch_length - 15)
turtle.left(40)
trunk(branch_length - 15)
turtle.right(20)
turtle.backward(branch_length)
# 树冠函数
def crown(branch_length):
if branch_length > 20:
angle = random.randint(-25, 25)
scale = random.uniform(0.7, 0.9)
turtle.right(angle)
turtle.forward(branch_length)
crown(branch_length * scale)
turtle.backward(branch_length)
turtle.left(angle)
# 根据三角函数绘制心形线
def love(x, y):
turtle.penup()
turtle.goto(x, y)
turtle.pendown()
turtle.color('pink')
turtle.begin_fill()
turtle.left(45)
turtle.forward(100)
turtle.circle(50, 180)
turtle.right(90)
turtle.circle(50, 180)
turtle.forward(100)
turtle.end_fill()
# 根据当前画笔位置和颜色绘制一组星星
def stars():
turtle.penup()
x = random.randint(-turtle.window_width() // 2, turtle.window_width() // 2)
y = random.randint(-turtle.window_height() // 2, turtle.window_height() // 2)
turtle.goto(x, y)
turtle.pendown()
turtle.color('yellow')
turtle.begin_fill()
for i in range(5):
turtle.forward(20)
turtle.right(144)
turtle.end_fill()
# 主函数
def main():
turtle.left(90)
turtle.penup()
turtle.goto(0, -150)
turtle.pendown()
turtle.color('brown')
trunk(100)
crown(70)
love(0, 150)
for i in range(20):
stars()
turtle.hideturtle()
turtle.done()
if __name__ == '__main__':
main()
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