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index.html
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<!DOCTYPE html>
<html>
<head>
<title>Latitude/longitude of a point</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link rel="stylesheet" href="style.css" />
<link rel="stylesheet" href="leaflet.css" />
<link rel="stylesheet" href="leaflet.draw.css" />
<script src="jquery-2.0.3.min.js"></script>
<script src="d3.v3.min.js"></script>
<script src="leaflet.js"></script>
<script src="leaflet.draw.js"></script>
</head>
<body>
<div id="map"></div>
<div id="box">
<div id="pad">
<div id="box-info">
<h2>Info</h2>
<p>Latitude/longitude of a point or a selection rectangle. Use the edit controls to create a selection rectangle.</p>
<p>
<div>
<label for="tile-url">Tiles:</label>
<input id="tile-url" placeholder="Custom tile URL template">
<button id="set-tile-url">Set</button>
<div>
</p>
</div>
<div id="box-map">
<h2>Map</h2>
<div id="geostrings-map"></div>
</div>
<div id="box-rectangle">
<h2>Selection</h2>
<div id="geostrings-rectangle"></div>
</div>
</div>
</div>
<script>
var precision = 4;
hashChangeEnabled = true;
var map = L.map('map');
var rectangle;
//var tileUrl = "http://tiles.citysdk.waag.org/v2/bag/{z}/{x}/{y}.png";
var tileUrl = "http://otile2.mqcdn.com/tiles/1.0.0/osm/{z}/{x}/{y}.png";
var tileLayer = L.tileLayer(tileUrl, {
attributionControl: false,
minZoom: 2
}).addTo(map);
var drawnItems = new L.FeatureGroup().addTo(map);
var drawControl = new L.Control.Draw({
draw: {
position: 'topleft',
polyline: false,
polygon: false,
rectangle: {
repeatMode: false
},
circle: false,
marker: false
},
edit: {
featureGroup: drawnItems
}
});
map.addControl(drawControl);
var crosshairLength = 10;
var crosshair = [
[0, -1], [1, 0], [0, 1], [-1, 0]
];
var g = d3.select(".leaflet-control-container")
.append("div")
.attr("class", "leaflet-middle")
.append("svg")
.attr("class", "crosshair")
.attr("width", 64)
.attr("height", 64)
.append("svg:g")
.attr("transform", "translate(32,32)")
.selectAll('line')
.data(crosshair)
g.enter().append('line')
.attr("class", "crosshair-outline")
.attr("x1", function(d) { return d[0] * crosshairLength; } )
.attr("y1", function(d) { return d[1] * crosshairLength; } )
.attr("x2", function(d) { return d[0] * crosshairLength * 2; } )
.attr("y2", function(d) { return d[1] * crosshairLength * 2; } )
g.enter().append('line')
.attr("x1", function(d) { return d[0] * crosshairLength; } )
.attr("y1", function(d) { return d[1] * crosshairLength; } )
.attr("x2", function(d) { return d[0] * crosshairLength * 2; } )
.attr("y2", function(d) { return d[1] * crosshairLength * 2; } )
map.on('draw:created', function (e) {
var type = e.layerType,
layer = e.layer;
if (type === 'rectangle') {
rectangle = layer;
drawnItems.addLayer(rectangle);
}
updateAllGeoStrings();
});
$(".leaflet-draw-draw-rectangle").on("click", function(e) {
rectangle = null;
drawnItems.clearLayers();
})
// map.on('draw:drawstart', function (e) {
// rectangle = null;
// drawnItems.clearLayers() ;
// });
map.on('draw:editstop', function (e) {
updateAllGeoStrings();
});
// map.setView([52.3674, 4.915], 6);
map.setView ([41.0581, 29.0176], 9);
map.on('move', function(e) {
hashChangeEnabled = false;
updateAllGeoStrings();
var lat = roundLatLon(map.getCenter().lat);
var lon = roundLatLon(map.getCenter().lng);
var zoom = map.getZoom();
var newHash = "map=" + [zoom, lat, lon].join("/");
if ($("#tile-url").val()) {
newHash += "&tiles=" + encodeURIComponent($("#tile-url").val());
}
window.location.hash = newHash;
});
map.on('movestart', function(e) {
hashChangeEnabled = false;
});
map.on('zoomstart', function(e) {
hashChangeEnabled = false;
});
map.on('moveend', function(e) {
hashChangeEnabled = true;
});
map.on('zoomend', function(e) {
hashChangeEnabled = true;
});
$("#set-tile-url").on("click", function(event){
if ($("#tile-url").val()) {
tileLayer.setUrl($("#tile-url").val());
} else {
tileLayer.setUrl(decodeURIComponent(tileUrl));
}
});
function updateGeoStrings(id, geoStrings) {
var strings = {
cntr: "Center",
bb: "Bounding box"
};
var divs = d3.select("#geostrings-" + id).selectAll("div")
.data(geoStrings);
var div = divs.enter().append("div")
div.append("h3")
.html(function(d) { return strings[d.type]; })
var trs = div.append("table")
.attr("class", "data-table")
.selectAll("tr")
.data(function(d) {
return d.strings;
});
var tr = trs.enter().append("tr");
tr.append("td")
.attr("class", "key")
.append("img")
.attr("src", function(d) {
return "images/" + d.type + ".png";
});
tr.append("td")
.attr("class", "value");
// Update
divs.select("table")
.selectAll("tr")
.data(function(d) { return d.strings; })
.select("td.value")
.html(function(d) { return d.string; });
// Exit
var hond = divs.exit();
hond.remove();
trs.exit().remove();
}
function updateAllGeoStrings() {
updateMapGeoStrings();
updateRectangleGeoStrings();
}
function updateMapGeoStrings() {
var bounds = map.getBounds(),
cntr = map.getCenter();
var geoStrings = [
{type: "cntr", strings: latLonToString(cntr)},
{type: "bb", strings: rectToString(bounds.getNorthWest(), bounds.getSouthEast())}
];
updateGeoStrings('map', geoStrings);
}
function updateRectangleGeoStrings() {
var geoStrings = [];
if (rectangle) {
var latLngs = rectangle.getLatLngs(),
southWest = new L.LatLng(latLngs[0].lat, latLngs[0].lng),
northEast = new L.LatLng(latLngs[2].lat, latLngs[2].lng),
bounds = new L.LatLngBounds(southWest, northEast);
geoStrings = [
{type: "cntr", strings: latLonToString(bounds.getCenter())},
{type: "bb", strings: rectToString(bounds.getNorthWest(), bounds.getSouthEast())}
];
}
updateGeoStrings('rectangle', geoStrings);
}
function latLonToString(ll) {
var lat = ll.lat.toFixed(precision);
var lon = ll.lng.toFixed(precision);
return [
{type: "latlon", string: lat + "," + lon},
{type: "wkt", string: "POINT(" + lon + " " + lat + ")"},
{type: "postgis", string: "ST_SetSRID(ST_MakePoint(" + lon + ", " + lat + "), 4326)"},
{type: "geojson", string: "{\"type\":\"Point\",\"coordinates\":[" + lon + "," + lat + "]}"}
]
}
function rectToString(nw, se) {
var nwLat = nw.lat.toFixed(precision);
var nwLon = nw.lng.toFixed(precision);
var seLat = se.lat.toFixed(precision);
var seLon = se.lng.toFixed(precision);
return [
{type: "latlon", string: nwLat + "," + nwLon + "," + seLat + "," + seLon},
{type: "wkt", string: "POLYGON((" +
nwLon + " " + nwLat + "," +
seLon + " " + nwLat + "," +
seLon + " " + seLat + "," +
nwLon + " " + seLat + "," +
nwLon + " " + nwLat +
"))"},
{type: "postgis", string: "ST_SetSRID(ST_MakeBox2D(ST_Point(" + nwLon + ", " + nwLat + "), ST_Point(" + seLon + ", " + seLat + ")), 4326)"},
{type: "geojson", string: "{\"type\":\"Polygon\",\"coordinates\":[[[" +
nwLon + "," + nwLat + "],[" +
seLon + "," + nwLat + "],[" +
seLon + "," + seLat + "],[" +
nwLon + "," + seLat + "],[" +
nwLon + "," + nwLat +
"]]]}"}
];
}
window.onhashchange = function() {
if (hashChangeEnabled) {
var hash = {};
if (window.location.hash.length > 1) {
var hashes = window.location.hash.substring(1).split("&"); // Remove "#"
for (var i = 0; i < hashes.length; i++) {
if (hashes[i].indexOf("=") != -1) {
var kv = hashes[i].split("=");
hash[kv[0]] = kv[1];
}
}
}
if (hash.map && hash.map.split("/").length == 3) {
var hashMap = hash.map.split("/");
var zoom = parseInt(hashMap[0]);
var lat = parseFloat(hashMap[1]);
var lon = parseFloat(hashMap[2]);
map.setView([lat, lon], zoom);
}
if (hash.tiles) {
var newTileUrl = decodeURIComponent(hash.tiles);
$("#tile-url").val(newTileUrl);
tileLayer.setUrl(newTileUrl);
}
}
hashChangeEnabled = true;
}
window.onhashchange();
updateAllGeoStrings();
function roundLatLon(l) {
return Math.round(l * 10000) / 10000;
}
</script>
</body>
</html>