GUI-GeoJson.ipynb

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    "from ipywidgets import Layout, HBox, VBox, FloatText\n",
    "import copy\n",
    "import json\n",
    "import pygeohash as gh\n",
    "from ipyleaflet import (\n",
    "    Map, basemaps, TileLayer, SplitMapControl, GeoJSON, Polygon, DrawControl, LayersControl, Layer, LayerGroup\n",
    ")"
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    "m = Map(center=[53.88, 27.45], zoom=3)\n",
    "\n",
    "# geojson layer with hover handler\n",
    "with open('./europe_110.geo.json') as f:\n",
    "    data = json.load(f)\n",
    "\n",
    "def decorate_geojson_for_display(data):\n",
    "    disp_data = copy.deepcopy(data)\n",
    "    for feature in disp_data['features']:\n",
    "        feature['properties']['style'] = {\n",
    "            'color': 'grey',\n",
    "            'weight': 1,\n",
    "            'fillColor': 'grey',\n",
    "            'fillOpacity': 0.2\n",
    "        }\n",
    "        feature_id = feature['properties']['iso_a3']\n",
    "    return disp_data\n",
    "        \n",
    "def create_lookup_dictionary_id_geometry(data):\n",
    "    geometry_dict = {}\n",
    "    for feature in data['features']:\n",
    "        feature_id = feature['properties']['iso_a3']\n",
    "        geometry_dict[feature_id] = feature['geometry']\n",
    "    return geometry_dict\n",
    "\n",
    "        \n",
    "def click_handler_selected(event=None, properties=None, id=None, **args):\n",
    "    print('Selected: '  + str(event))\n",
    "\n",
    "def click_handler_geojson(event=None, properties=None, id=None, **args):\n",
    "    print('GeoJSON: '  + str(event))\n",
    "    global lookup_dict\n",
    "    global selected_dict\n",
    "    global selected_layer\n",
    "    global layer_geojson\n",
    "    if properties is not None:\n",
    "        feature_id = properties['iso_a3']\n",
    "        if lookup_dict[feature_id]['type'] == 'Polygon':\n",
    "            if feature_id in selected_dict:\n",
    "                rem_polygon = selected_dict.pop(feature_id)\n",
    "                selected_layer.remove_layer(rem_polygon)\n",
    "            else:\n",
    "                feature = lookup_dict[feature_id]\n",
    "                polygon = Polygon(locations=[[p[1], p[0]] for p in feature['coordinates'][0]], color='yellow', fillColor='yellow')\n",
    "                selected_dict[feature_id] = polygon\n",
    "                selected_layer.add_layer(polygon)\n",
    "    if len(args.keys()) > 0:\n",
    "        lat = args['coordinates'][0]\n",
    "        lon = args['coordinates'][1]\n",
    "\n",
    "def print_anything(event=None, properties=None, id=None):\n",
    "    print(\"Anything\")\n",
    "        \n",
    "disp_data = decorate_geojson_for_display(data)\n",
    "lookup_dict = create_lookup_dictionary_id_geometry(disp_data)\n",
    "selected_dict = {}\n",
    "\n",
    "layer_geojson = GeoJSON(data=disp_data, hover_style={'fillColor': 'red'}, name='GeoJson')\n",
    "m.add_layer(layer_geojson)\n",
    "layer_geojson.on_click(click_handler_geojson)\n",
    "\n",
    "selected_layer = LayerGroup(name='Selected')\n",
    "selected_layer.on_click(print_anything)\n",
    "m.add_layer(selected_layer)\n",
    "\n",
    "m.add_control(DrawControl())\n",
    "lc = LayersControl()\n",
    "m.add_control(lc)\n",
    "m"
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    "\n",
    "layer_geojson.send({'msg':'change:style'})"
   ]
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    "help(layer_geojson.send)"
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