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preview.html
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preview.html
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<!doctype html>
<html>
<head>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.18.0/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.18.0/mapbox-gl.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
ul { list-style-type: none; width: 30%; }
li { margin-bottom: 20px; }
li img { width: 49%; }
#map { position:fixed; top:0; bottom:0; right: 0; width: 65%; }
</style>
</head>
<body>
<div id="map"></div>
<script>
var query = {}
window.location.search.substring(1).split('&').forEach(function (p) {
p = p.split('=')
query[p[0]] = p[1]
})
var prefix = query.prefix || 'data'
if (!prefix.endsWith('/')) { prefix = prefix + '/' }
query = Object.assign({
images: prefix + 'images/',
labels: prefix + 'labels/color/',
sample: prefix + 'sample.txt',
labelRatio: 0
}, query)
// map
mapboxgl.accessToken = query.accessToken
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/satellite-v8',
center: [-74.50, 40],
zoom: 9
})
.on('load', function () {
map.addSource('tile', { type: 'geojson', data: { type: 'FeatureCollection', features: [] } })
map.addLayer({
'id': 'tile',
'source': 'tile',
'type': 'line',
'paint': {
'line-color': 'red',
'line-width': 4
}
})
})
// grab tile list and show images + labels side by side
var tiles = []
fetch(query.sample)
.then(function (response) { return response.text() })
.then(function (text) {
var lines = text.trim().split('\n')
.map(function (line) {
if (line.startsWith('#')) { return null }
line = line.split(' ')
var tile = line.slice(1, 4).map(Number)
tiles.push(tile)
var labelCounts = line.slice(4)
if (query.labelRatio >= 0 && labelCounts.length) {
labelCounts = labelCounts.map(Number)
r = 1 - labelCounts[labelCounts.length - 1] / labelCounts.reduce((a, b) => a + b, 0)
if (r <= query.labelRatio) { return null }
}
var lonlat = [tile2long(tile[1], tile[0]), tile2lat(tile[2], tile[0])].map(function (c) { return c.toFixed(4) })
return `
<li data-tile="${tile.join(',')}" data-label-counts="${labelCounts}">
<img src="blank.gif" class="lazy" data-src="${query.images}${tile.join('-')}.jpg">
<img src="blank.gif" class="lazy" data-src="${query.labels}${tile.join('-')}.png">
<div>${tile} (${lonlat.reverse()})</div>
<div>${labelCounts}</div>
</li>
`
})
.filter(Boolean)
document.querySelector('ul').innerHTML += lines.join('\n')
initLazyLoad()
var items = document.querySelectorAll('li')
for (var i = 0; i < items.length; i++) {
var li = items[i]
li.addEventListener('click', onClick)
li.addEventListener('mouseover', onHover);
}
var boxes = {
type: 'FeatureCollection', features: tiles.map(tileToFeature)
}
map.addSource('all-tiles', { type: 'geojson', data: boxes })
map.addLayer({
'id': 'all-tiles',
'source': 'all-tiles',
'type': 'fill',
'paint': {
'fill-color': 'red',
'fill-opacity': 0.25
}
})
})
function onClick (e) {
var tile = e.currentTarget.dataset.tile.split(',').map(Number)
var [w, s, e, n] = tileToBBOX(tile)
var z = +tile[0]
map.jumpTo({center: [ (w + e) / 2, (s + n) / 2 ], zoom: z - 1, speed: 2})
map.getSource('tile').setData(tileToFeature(tile))
}
function onHover (e) {
console.log(e.currentTarget.dataset)
}
// modified from https://github.com/mapbox/tilebelt/blob/master/index.js
function tile2long(x,z) { return (x/Math.pow(2,z)*360-180); }
function tile2lat(y,z) {
var n=Math.PI-2*Math.PI*y/Math.pow(2,z);
return (180/Math.PI*Math.atan(0.5*(Math.exp(n)-Math.exp(-n))));
}
function tileToBBOX(tile) {
var e = tile2long(tile[1] + 1, tile[0]);
var w = tile2long(tile[1], tile[0]);
var s = tile2lat(tile[2] + 1, tile[0]);
var n = tile2lat(tile[2], tile[0]);
return [w, s, e, n];
}
function tileToFeature(tile) {
var [w, s, e, n] = tileToBBOX(tile)
return {
type: 'Feature',
properties: {},
geometry: {
type: 'Polygon',
coordinates: [
[
[w, n],
[w, s],
[e, s],
[e, n],
[w, n]
]
]
}
}
}
/* copied from:
* lazyload.js (c) Lorenzo Giuliani
* MIT License (http://www.opensource.org/licenses/mit-license.html)
*
* expects a list of:
* `<img src="blank.gif" data-src="my_image.png" width="600" height="400" class="lazy">`
*/
function loadImage (el, fn) {
var img = new Image()
, src = el.getAttribute('data-src');
img.onload = function() {
if (!! el.parent)
el.parent.replaceChild(img, el)
else
el.src = src;
fn? fn() : null;
}
img.src = src;
}
function elementInViewport(el) {
var rect = el.getBoundingClientRect()
return (
rect.top >= 0
&& rect.left >= 0
&& rect.top <= (window.innerHeight || document.documentElement.clientHeight)
)
}
function initLazyLoad () {
var query = document.querySelectorAll('img.lazy')
var processScroll = function(){
for (var i = 0; i < images.length; i++) {
if (elementInViewport(images[i])) {
loadImage(images[i], function () {
images.splice(i, i);
});
}
};
};
var images = Array.prototype.slice.call(query)
processScroll();
window.addEventListener('scroll',processScroll);
}
</script>
</body>
<ul></ul>
</html>