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/* Map */
const map = L.map('map').setView([55.69, 12.57], 12);
const tiles = L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png', {
maxZoom: 19,
attribution: '© <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>'
}).addTo(map);
/* Load image */
current_image = null;
var main_image = document.getElementById('main-image');
var background_image = document.getElementById('background-image');
main_image.onload = function() {
/* Re-trigger animation */
main_image.style.animation = 'none';
main_image.offsetHeight; /* trigger reflow */
main_image.style.animation = null;
};
function load_image (image_name) {
current_image_name = image_name;
url = `/static/pics/mine/${image_name}`;
/* JS foo to change image https://stackoverflow.com/questions/19396390/load-image-from-javascript */
var newImg = new Image;
newImg.onload = function() {
main_image.src = this.src;
background_image.style.backgroundImage = `url("${this.src}")`;
map.invalidateSize(); // Re-calc the map size after image load, to re-center view & fix fit answer in bounds
/* Zoom script */
WZoom.create('#main-image',
{
smoothTime: 0,
width: main_image.naturalWidth,
height: main_image.naturalHeight,
minScale: 1,
maxScale: 10,
onGrab: function () {
main_image.style.cursor = 'grabbing';
},
onDrop: function () {
main_image.style.cursor = 'grab';
},
}
);
}
newImg.src = url;
}
async function get_random_image() {
const url = "/get_random_image.json";
try {
const response = await fetch(url);
if (!response.ok) {
throw new Error(`Response status: ${response.status}`);
}
const img_name = await response.text();
load_image(img_name);
} catch (error) {
console.error(error.message);
}
}
get_random_image()
/* Guess */
current_guess_coordinates = null;
document.getElementById('guess-button').addEventListener("click", function(){ guess(current_image_name, current_guess_coordinates); });
const overlay_distance = document.getElementById('overlay-distance');
const next_button = document.getElementById('next-button');
async function guess(image_name, coordinates) {
const url = "/guess.json";
var json = null;
try {
const response = await fetch(url,
{
method: "POST",
body: JSON.stringify({ image_name: image_name, coordinates: coordinates})
}
);
if (!response.ok) {
throw new Error(`Response status: ${response.status}`);
}
json = await response.json();
} catch (error) {
console.error(error.message);
throw (error)
}
var correct_marker = L.marker(json.correct_coordinates, {'icon': correctIcon, 'title': 'Correct location'}).addTo(correctMarkersGroup);
/* Add line between guess and correct answer */
var firstpolyline = new L.Polyline([correct_marker._latlng, guess_marker._latlng], {
color: 'black',
weight: 4,
opacity: 0.5,
smoothFactor: 1
});
firstpolyline.addTo(map);
// Fit answer & guess in view
var group = new L.featureGroup([correct_marker, guess_marker]);
map.fitBounds(group.getBounds(), {padding: [50, 50]});
overlay_distance.hidden = false;
overlay_distance.children[1].innerHTML = `≈ ${json.distance_meters} meters` ;
guess_button.hidden = true;
next_button.hidden = false;
}
/* Correct location marker */
var correctMarkersGroup = L.layerGroup();
map.addLayer(correctMarkersGroup);
var correctIcon = L.icon({
iconUrl: '/static/leaflet/images/correct-marker-icon.png',
shadowUrl: '/static/leaflet/images/marker-shadow.png',
iconSize: [25, 41], // Size of the icon
iconAnchor: [12, 41], // Point of the icon which will correspond to marker's location
shadowSize: [41, 41] // Size of the shadow
});
/* Click map to add marker */
var guess_marker = null;
const guess_button = document.getElementById('guess-button');
var guessIcon = L.icon({
iconUrl: '/static/leaflet/images/guess-marker-icon.png',
shadowUrl: '/static/leaflet/images/marker-shadow.png',
iconSize: [25, 41], // Size of the icon
iconAnchor: [12, 41], // Point of the icon which will correspond to marker's location
shadowSize: [41, 41] // Size of the shadow
});
// a layer group, used here like a container for markers
var userMarkersGroup = L.layerGroup();
map.addLayer(userMarkersGroup);
map.on('click', function(e) {
/* Disallow re-guessing if already submitted */
if (!next_button.hidden) {
return;
}
// get the count of currently displayed markers
var markersCount = userMarkersGroup.getLayers().length;
if (markersCount > 0) {
userMarkersGroup.clearLayers();
}
guess_marker = L.marker(e.latlng, {'icon': guessIcon, 'title': 'Guess location'}).addTo(userMarkersGroup);
current_guess_coordinates = e.latlng;
guess_button.hidden = false;
});
/* */
function next() {
window.location.reload();
}
/* Key bindings */
document.addEventListener('keydown', function(e) {
if (e.key === 'Escape' || e.keyCode === 27) {
userMarkersGroup.clearLayers();
document.getElementById('guess-button').hidden = true;
} else if (e.key === 'Enter' || e.keyCode === 13 || e.key === 'Space' || e.keyCode === 32) {
if (guess_marker != null) {
guess(current_image_name, current_guess_coordinates);
}
if (!next_button.hidden) {
next();
}
}
});
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