docs/maplibre/animate_a_line.ipynb

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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "[![image](https://jupyterlite.rtfd.io/en/latest/_static/badge.svg)](https://demo.leafmap.org/lab/index.html?path=maplibre/animate_a_line.ipynb)\n",
    "[![image](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/opengeos/leafmap/blob/master/docs/maplibre/animate_a_line.ipynb)\n",
    "[![image](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/opengeos/leafmap/HEAD)\n",
    "\n",
    "**Animate a line**\n",
    "\n",
    "This source code of this example is adapted from the MapLibre GL JS example - [Animate a line](https://maplibre.org/maplibre-gl-js/docs/examples/animate-a-line/).\n",
    "\n",
    "Uncomment the following line to install [leafmap](https://leafmap.org) if needed."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# %pip install \"leafmap[maplibre]\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import time\n",
    "import pandas as pd\n",
    "import leafmap.maplibregl as leafmap"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "To run this notebook, you will need an [API key](https://docs.maptiler.com/cloud/api/authentication-key/) from [MapTiler](https://www.maptiler.com/cloud/). Once you have the API key, you can uncomment the following code block and replace `YOUR_API_KEY` with your actual API key. Then, run the code block code to set the API key as an environment variable."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# import os\n",
    "# os.environ[\"MAPTILER_KEY\"] = \"YOUR_API_KEY\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "url = \"https://github.com/opengeos/datasets/releases/download/world/animated_line_data.csv\"\n",
    "df = pd.read_csv(url)\n",
    "df_sample = df.sample(n=1000, random_state=1).sort_index()\n",
    "df_sample.loc[len(df_sample)] = df.iloc[-1]\n",
    "df_sample.head()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "m = leafmap.Map(center=[0, 0], zoom=0.5, style=\"streets\")\n",
    "geojson = {\n",
    "    \"type\": \"FeatureCollection\",\n",
    "    \"features\": [\n",
    "        {\"type\": \"Feature\", \"geometry\": {\"type\": \"LineString\", \"coordinates\": [[0, 0]]}}\n",
    "    ],\n",
    "}\n",
    "source = {\"type\": \"geojson\", \"data\": geojson}\n",
    "m.add_source(\"line\", source)\n",
    "layer = {\n",
    "    \"id\": \"line-animation\",\n",
    "    \"type\": \"line\",\n",
    "    \"source\": \"line\",\n",
    "    \"layout\": {\"line-cap\": \"round\", \"line-join\": \"round\"},\n",
    "    \"paint\": {\"line-color\": \"#ed6498\", \"line-width\": 5, \"line-opacity\": 0.8},\n",
    "}\n",
    "m.add_layer(layer)\n",
    "m"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "run_times = 2\n",
    "for i in range(run_times):\n",
    "    geojson[\"features\"][0][\"geometry\"][\"coordinates\"] = [[0, 0]]\n",
    "    for row in df_sample.itertuples():\n",
    "        time.sleep(0.005)\n",
    "        geojson[\"features\"][0][\"geometry\"][\"coordinates\"].append([row.x, row.y])\n",
    "        m.set_data(\"line\", geojson)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![](https://i.imgur.com/LRwfBl9.png)"
   ]
  }
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