Demos/ButtonsSlidersMenus1-async.ipynb

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       "HBox(children=(Button(description='Pause', style=ButtonStyle()), Button(description='Red', style=ButtonStyle()…"
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       "FloatSlider(value=250.0, description='Rotation speed:', max=500.0, min=20.0, step=1.0)"
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   "source": [
    "import ipywidgets as wd\n",
    "from vpython import *\n",
    "scene = canvas()\n",
    "# This version uses Jupyter notebook widgets: button, slider, menu\n",
    "# See ButtonsSlidersMenus2 for a version that uses VPython button, slider, menu, radio button, checkbox\n",
    "\n",
    "scene.width = 350\n",
    "scene.height = 300\n",
    "scene.range = 1.5\n",
    "scene.title = \"Buttons, Sliders, and Drop-down Menus\"\n",
    "\n",
    "box_object = box(visible=True)\n",
    "cone_object = cone(visible=False, radius=0.5)\n",
    "pyramid_object = pyramid(visible=False)\n",
    "cylinder_object = cylinder(visible=False, radius=0.5)\n",
    "objects = {'box':box_object, 'cone':cone_object, 'pyramid':pyramid_object, 'cylinder':cylinder_object}\n",
    "\n",
    "currentobject = box_object\n",
    "currentobject.color = color.cyan\n",
    "\n",
    "b = wd.Button(description='Pause')\n",
    "c = wd.Button(description='Red')\n",
    "m = wd.Dropdown(options=['box', 'cone', 'cylinder', 'pyramid'], value='box',\n",
    "                           description='Object:')\n",
    "container = wd.HBox(children=[b,c,m])\n",
    "display(container)\n",
    "sl = wd.FloatSlider(description='Rotation speed:', min=20, max=500, step=1, value=250)\n",
    "display(sl)\n",
    "\n",
    "running = True\n",
    "\n",
    "def b_handler(s):\n",
    "    global running\n",
    "    running = not running\n",
    "    if s.description == 'Run': s.description = 'Pause'\n",
    "    else: s.description = 'Run'\n",
    "b.on_click(b_handler)\n",
    "\n",
    "def c_handler(s):\n",
    "    if s.description == 'Red':\n",
    "        s.description = 'Cyan'\n",
    "        currentobject.color = color.red\n",
    "    else:\n",
    "        s.description = 'Red'\n",
    "        currentobject.color = color.cyan\n",
    "c.on_click(c_handler)\n",
    "\n",
    "def m_handler(s):\n",
    "    global currentobject\n",
    "    col = currentobject.color\n",
    "    currentobject.visible = False\n",
    "    currentobject = objects[s['new']]\n",
    "    currentobject.color = col\n",
    "    currentobject.visible = True\n",
    "m.observe(m_handler, names='value')\n",
    "\n",
    "import asyncio\n",
    "async def periodic():\n",
    "    while True:\n",
    "        await asyncio.sleep(0)\n",
    "        rate(100)\n",
    "        if running:\n",
    "            currentobject.rotate(angle=1e-4*sl.value, axis=vec(0,1,0))\n",
    "\n",
    "loop = asyncio.get_event_loop()\n",
    "task = loop.create_task(periodic())\n"
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