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index.html
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<!DOCTYPE html>
<html>
<head>
<title>arc.js</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.8.0/dist/leaflet.css"/>
<script src="https://unpkg.com/leaflet@1.8.0/dist/leaflet.js"></script>
<script src="./arc.js"></script>
<style>
body {
margin: 0px;
padding: 0px;
font:12px/15px 'Helvetica';
}
.box {
display: flex;
height: 100vh;
}
#map {
flex-grow: 6;
}
#json-dump {
height: 80vh;
}
#geojson {
flex-grow: 1;
display: flex;
flex-direction: column;
}
#text {
align-self: center;
}
</style>
</head>
<body>
<div class="box">
<div id="map"></div>
<div id="geojson">
<h3 id="text">
<a href="https://github.com/springmeyer/arc.js">Arc.js with Leaflet</a>: click to plot arcs
</h3>
<textarea id="json-dump"></textarea>
</div>
</div>
<script>
var map = L.map('map').setView(new L.LatLng(0, 0), 2)
var idx = 1;
var features = [];
var url = 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png';
var attribution = '© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors';
L.tileLayer(url, {
attribution,
maxZoom: 17,
noWrap:true
}).addTo(map);
// number of intermediate arc points
var npoints = 100;
var offset = 20;
var coords = [];
var points = [];
var snap_tolerance = 500000;
map.on('click', onMapClick);
var start;
var end;
function draw(coords) {
var len = coords.length;
if (len == 1) {
var hit = false;
start = coords[0];
for (var i=0;i<points.length;++i) {
var distance = points[i].distanceTo(start);
if (distance<snap_tolerance) {
//console.log('hit previous point, re-using location')
start = points[i];
hit = true;
} else {
//console.log(distance);
}
}
if (!hit) {
points.push(start);
}
var circleOptions = {color: '#f03', opacity: 0.5, clickable:false};
var circle = new L.CircleMarker(start, circleOptions);
map.addLayer(circle);
} else if (len == 2) {
var hit = false;
end = coords[1];
for (var i=0;i<points.length;++i) {
var distance = points[i].distanceTo(end);
if (distance<snap_tolerance && (points[i].lng !== start.lng)) {
//console.log('hit previous point, re-using location')
end = points[i];
hit = true;
} else {
//console.log(distance);
}
}
if (!hit) {
points.push(end);
}
var circleOptions = {color: '#f03', opacity: 0.5, clickable:false};
var circle = new L.CircleMarker(end, circleOptions);
map.addLayer(circle);
try {
var from = {x: start.lng, y: start.lat};
var to = {x: end.lng, y:end.lat};
var properties = {
arc:idx++,
start:''+from.x+','+from.y,
end:''+to.x+','+to.y
};
var greatCircle = new arc.GreatCircle(from,to,properties);
} catch (e) {
// catch possible antipodes error
alert(e.message);
coords.length = 0;
return;
}
var gc = greatCircle.Arc(npoints,{offset:offset});
var line = new L.geoJson().addTo(map);
var geojson_feature = gc.json();
features.push(geojson_feature)
// TODO - figure out how to disable interactivity on json lines
line.addData(geojson_feature);
line.bindPopup("great circle from " + coords[0] + " to " + coords[1]);
setTimeout(function() {
map.addLayer(line);
coords.length = 0;
document.getElementById("json-dump").value = JSON.stringify(
{ "type": "FeatureCollection",
"features": features
});
},0)
}
}
function onMapClick(e) {
var coord = new L.LatLng(e.latlng.lat, e.latlng.lng);
//console.log('clicked at: ' + e.latlng.lng + ' ' + e.latlng.lat)
coords.push(coord.wrap());
draw(coords);
}
function add(s,e) {
var start_ll = new L.LatLng(s[1],s[0]);
var end_ll = new L.LatLng(e[1],e[0]);
var start_coord = {x: start_ll.lng, y:start_ll.lat};
var end_coord = {x:end_ll.lng, y:end_ll.lat};
var description = ''+s[0]+','+s[1]+'=>'+e[0]+','+e[1]+'';
var gc0 = new arc.GreatCircle(start_coord,end_coord, {'name': 'line', 'color':'#ff7200','description':description});
var line0 = gc0.Arc(npoints,{offset:offset});
var geojson = line0.json();
console.log(JSON.stringify(geojson))
document.getElementById("json-dump").value = JSON.stringify(geojson);
L.geoJson(geojson, {
style: function (feature) {
return {color: feature.properties.color};
},
onEachFeature: function (feature, layer) {
layer.bindPopup(feature.properties.description);
}
}).addTo(map);
}
</script>
</body>
</html>