{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 操纵杆\n",
    "\n",
    "基于[nipple.js](https://yoannmoi.net/nipplejs/)创建一个操纵杆。"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "- `on_start`: 当用户触摸操纵杆时的回调\n",
    "- `on_move`: 当用户移动操纵杆时的回调\n",
    "- `on_end`: 用户释放操纵杆时的回调\n",
    "- `throttle`: 移动事件的 Throttle `interval` (以秒为单位)(默认值: `0.05`)\n",
    "- `options`: 像 `color` 这样的参数应该传递给底层的 [`nipple.js` 库](https://github.com/yoannmoinet/nipplejs#options)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "from nicegui import ui\n",
    "\n",
    "ui.joystick(color='blue', size=50,\n",
    "            on_move=lambda e: coordinates.set_text(f\"{e.x:.3f}, {e.y:.3f}\"),\n",
    "            on_end=lambda _: coordinates.set_text('0, 0'))\n",
    "coordinates = ui.label('0, 0')\n",
    "\n",
    "# ui.run()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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