Test tile caching in ipyleaflet

test_tile_caching.ipynb

test_tile_caching.ipynb{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Test Tile Caching\n",
    "\n",
    "This tries to mimick an effect of moving from one map center to another, like a *very* simple flyover, but without the vertical component shown e.g. here: https://panel.pyviz.org/gallery/external/deck.gl.html#gallery-deck-gl.\n",
    "\n",
    "The code below indicated that the map tiles seem not to be as well cached in the browser as one might expect, but keep being reloaded from the server. One might hope for some configuration in Leaflet to make this smoother..."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import time\n",
    "\n",
    "import geopy\n",
    "import ipyleaflet\n",
    "import numpy as np"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Define Start and End Points"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "geocode = geopy.geocoders.Nominatim(user_agent=\"mapflight\").geocode\n",
    "lat_lon = 'latitude longitude'.split()\n",
    "paris = [getattr(geocode('Paris'), attr) for attr in lat_lon]\n",
    "brussels = [getattr(geocode('Brussels'), attr) for attr in lat_lon]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Show Map at Start Point"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "m = ipyleaflet.Map(center=paris)\n",
    "m"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Build trajectory"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# This is on a \"straight\" line for illustration purposes, but should be on a great circle!\n",
    "lats = np.linspace(paris[0], brussels[0], 30)\n",
    "lons = np.linspace(paris[1], brussels[1], 30)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Fly one way, pause, and return"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "for point in zip(lats, lons):\n",
    "    m.center = point\n",
    "    time.sleep(0.5)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "time.sleep(1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "for point in reversed(list(zip(lats, lons))):\n",
    "    m.center = point\n",
    "    time.sleep(0.5)"
   ]
  }
 ],
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