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   "source": [
    "from vpython import *\n",
    "# John Coady\n",
    "\n",
    "title = \"Click and drag the mouse in the 3D canvas to insert and drag a small sphere.\"\n",
    "scene.title = title\n",
    "\n",
    "scene.range = 3\n",
    "\n",
    "b = box(pos=vector(0,0,0), color=color.green)\n",
    "\n",
    "drag = False\n",
    "s = None\n",
    "\n",
    "def grab(evt):\n",
    "    global s, drag\n",
    "    scene.title = 'Drag the sphere.'\n",
    "    drag = True\n",
    "    s = sphere(pos=evt.pos, radius=0.1, color=color.red)\n",
    "\n",
    "def move(evt):\n",
    "    if drag:\n",
    "        s.pos = evt.pos\n",
    "        \n",
    "def drop(evt):\n",
    "    global drag\n",
    "    scene.title = title\n",
    "    s.color = color.cyan\n",
    "    drag = False\n",
    "\n",
    "scene.bind('mousedown',grab)\n",
    "scene.bind('mousemove',move)\n",
    "scene.bind('mouseup',drop)"
   ]
  },
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