import turtle
import random

# 设置屏幕
turtle.bgpic("黑夜.png")
# 创建画笔
pen = turtle.Turtle()
# 隐藏画笔
pen.hideturtle()
# 设置画笔和填充颜色
pen.color("yellow")


# 画星星
def draw_star(x, y):
    # 移动画笔但不绘制
    pen.penup()
    pen.goto(x, y)
    pen.pendown()

    pen.begin_fill()
    # 画出一个星星
    for i in range(5):
        pen.forward(10)
        pen.left(144)
    pen.end_fill()


# 窗口点击事件监听
turtle.onscreenclick(draw_star)

# 将窗口刷新关闭
turtle.tracer(0)

# 停止画笔绘制，但绘图窗体不关闭
turtle.done()