NGLviewer: Attempt to add text labels to selection

NGLviewer_add_labels.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# NGL viewer - Add labels"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "216f1874f5ad4447a03e4697edf231d3",
       "version_major": 2,
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      "text/plain": [
       "_ColormakerRegistry()"
      ]
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       "version_minor": 0
      },
      "text/plain": [
       "NGLWidget()"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "import nglview as nv\n",
    "\n",
    "pdb_id = '2g2i'\n",
    "chain = 'A'\n",
    "res_id = 229\n",
    "\n",
    "viewer = nv.show_pdbid(pdb_id, default=False)\n",
    "viewer.clear()\n",
    "viewer.add_cartoon(selection=f':{chain}', assembly='AU')\n",
    "viewer.center(selection=f'{res_id}')\n",
    "\n",
    "viewer"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "label_kwargs = dict(labelType='text', showBackground=True, backgroundColor='black')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "viewer.add_label(sele=f'@0', labelText=[f'First atom? ID 0'], **label_kwargs)\n",
    "# Label shows up!"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "viewer.add_label(sele=f'@1', labelText=[f'Also first atom? ID 1'], **label_kwargs)\n",
    "# Vertical mini-label without text shows up..."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "viewer.remove_label()\n",
    "viewer.remove_label()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "viewer.add_label(sele=f'{res_id}:{chain}.CA', labelText=[f'Atom I am interested in'], **label_kwargs)\n",
    "# Same vertical mini-label without text shows up..."
   ]
  }
 ],
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