python怎么做表针

<code class="python">import tkinter as tk</code>

<code class="python">root = tk.Tk()
canvas = tk.Canvas(root, width=300, height=300)
canvas.pack()</code>

<code class="python">def draw_hand(hand_length, angle, color="black"):
  """
  在给定的画布上绘制表针。

  参数：
    hand_length: 表针的长度（像素）
    angle: 表针的旋转角度（弧度）
    color: 表针的颜色（可选）
  """

  # 计算表针的坐标
  x1 = 150
  y1 = 150
  x2 = x1 + hand_length * math.cos(angle)
  y2 = y1 - hand_length * math.sin(angle)

  # 绘制表针
  canvas.create_line(x1, y1, x2, y2, width=5, fill=color)</code>

<code class="python">import time
import math

# 时钟更新间隔（秒）
UPDATE_INTERVAL = 1

# 创建表针
hour_hand_length = 80
minute_hand_length = 100
second_hand_length = 120

while True:
  # 计算当前时间
  current_time = time.localtime()

  # 计算表针的角度
  hour_angle = math.radians(30 * current_time.tm_hour + 0.5 * current_time.tm_min)
  minute_angle = math.radians(6 * current_time.tm_min + 0.1 * current_time.tm_sec)
  second_angle = math.radians(6 * current_time.tm_sec)

  # 绘制表针
  draw_hand(hour_hand_length, hour_angle)
  draw_hand(minute_hand_length, minute_angle)
  draw_hand(second_hand_length, second_angle, "red")

  # 更新画布
  root.update()

  # 暂停更新间隔
  time.sleep(UPDATE_INTERVAL)</code>