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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<title>Leaflet Circle</title>
<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/leaflet.css" />
<style>
body {
padding: 0;
margin: 0;
}
html,
body,
#map {
height: 100%;
width: 100%;
}
</style>
</head>
<body>
<div id="map"></div>
</body>
<script src="https://unpkg.com/[email protected]/dist/leaflet.js"></script>
<script src="./GreatCircle/GreatCircleUtil.js"></script>
<script src="./GreatCircle/arc.js"></script>
<script>
var map = L.map('map', {
center: [31, 121],
zoom: 4
});
L.tileLayer('http://{s}.tiles.mapbox.com/v3/springmeyer.map-7jkxlsx1/{z}/{x}/{y}.png', {
attribution: ''
}).addTo(map);
//求两点之间大圆距离（也就是最短距离）
GreatCircleUtil.distance(30.7,122.72,28.49,127.64);
//求两点之间的方位
GreatCircleUtil.bearing(30.7,122.72,28.49,127.64);
// number of intermediate arc points
var idx = 1;
var features = [];
var npoints = 100;
var offset = 20;
var coords = [];
var points = [];
var snap_tolerance = 500000;
map.on('click',onMapClick);
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 draw(coors) {
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.lon+','+from.lat,
end:''+to.lon+','+to.lat
};
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)
line.addData(geojson_feature);
}
}
</script>
</html>