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   "source": [
    "from vpython import *\n",
    "# This version uses VPython widgets: button, radio button, checkbox, slider, menu\n",
    "# See ButtonsSlidersMenus1 for a version that uses Jupyter notebook widgets: button, slider, menu\n",
    "scene.width = 350\n",
    "scene.height = 300\n",
    "scene.range = 1.3\n",
    "scene.title = \"Widgets (buttons, etc.)\\n\"\n",
    "\n",
    "running = True\n",
    "\n",
    "def Run(b):\n",
    "    global running\n",
    "    running = not running\n",
    "    if running: b.text = \"Pause\"\n",
    "    else: b.text = \"Run\"\n",
    "    \n",
    "button(text=\"Pause\", pos=scene.title_anchor, bind=Run)\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",
    "sphere(radius=0.3)\n",
    "\n",
    "col = color.cyan\n",
    "currentobject = box_object\n",
    "currentobject.color = col\n",
    "\n",
    "def Color(c):\n",
    "    global col\n",
    "    if col.equals(color.cyan): # change to red\n",
    "        currentobject.color = col = color.red\n",
    "        cbutton.text = \"<b>Cyan</b>\"\n",
    "        cbutton.textcolor = color.cyan\n",
    "        cbutton.background = color.red\n",
    "        r1.checked = False\n",
    "        r2.checked = True\n",
    "    else:                      # change to cyan\n",
    "        currentobject.color = col = color.cyan\n",
    "        cbutton.text = \"<b>Red</b>\"\n",
    "        cbutton.textcolor = color.red\n",
    "        cbutton.background = color.cyan\n",
    "        r1.checked = True\n",
    "        r2.checked = False\n",
    "        \n",
    "cbutton = button(text='<b>Red</b>', textcolor=color.red, background=color.cyan, pos=scene.title_anchor, bind=Color)\n",
    "\n",
    "scene.caption = \"Vary the rotation speed: \\n\"\n",
    "speed = 150\n",
    "def setspeed(s):\n",
    "    global speed\n",
    "    speed = s.value\n",
    "    wt.text = '{}'.format(s.value)\n",
    "    \n",
    "sl = slider(min=20, max=500, value=250, length=280, bind=setspeed, right=15)\n",
    "\n",
    "wt = wtext(text=sl.value)\n",
    "\n",
    "scene.append_to_caption('\\n')\n",
    "\n",
    "r1 = radio(bind=Color, checked=True, text='Cyan')\n",
    "\n",
    "scene.append_to_caption('       ')\n",
    "\n",
    "def M(m):\n",
    "    global col, currentobject\n",
    "    op = currentobject.opacity\n",
    "    currentaxis = currentobject.axis\n",
    "    currentobject.visible = False\n",
    "    val = m.selected\n",
    "    if val == \"box\": \n",
    "        currentobject = box_object\n",
    "    elif val == \"cone\": \n",
    "        currentobject = cone_object\n",
    "    elif val == \"pyramid\": \n",
    "        currentobject = pyramid_object\n",
    "    elif val == \"cylinder\": \n",
    "        currentobject = cylinder_object\n",
    "    currentobject.color = col\n",
    "    currentobject.axis = currentaxis\n",
    "    currentobject.visible = True\n",
    "    currentobject.opacity = op\n",
    "\n",
    "menu(choices=['Choose an object', 'box', 'cone', 'pyramid', 'cylinder'], index=0, bind=M)\n",
    "\n",
    "scene.append_to_caption('\\n')\n",
    "\n",
    "r2 = radio(bind=Color, text='Red')\n",
    "\n",
    "scene.append_to_caption('         ')\n",
    "\n",
    "def transparency(b):\n",
    "    if b.checked:\n",
    "        currentobject.opacity = 0.5\n",
    "    else:\n",
    "        currentobject.opacity = 1\n",
    "\n",
    "checkbox(bind=transparency, text='Transparent')\n",
    "\n",
    "while True:\n",
    "    rate(100)\n",
    "    if running:\n",
    "        currentobject.rotate(angle=speed*1e-4, axis=vector(0,1,0))\n",
    "\n"
   ]
  },
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