77 lines
2.2 KiB
JavaScript
77 lines
2.2 KiB
JavaScript
define(["leaflet", "jshashes"],
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function (L, jsHashes) {
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var MD5 = new jsHashes.MD5();
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return L.TileLayer.Canvas.extend({
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setData: function (d) {
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this.data = d;
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//pre-calculate start angles
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this.data.all().forEach(function (d) {
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var hash = MD5.hex(d.node.nodeinfo.node_id);
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d.startAngle = (parseInt(hash.substr(0, 2), 16) / 255) * 2 * Math.PI;
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});
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this.redraw();
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},
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drawTile: function (canvas, tilePoint) {
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function getTileBBox(s, map, tileSize, margin) {
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var tl = map.unproject([s.x - margin, s.y - margin]);
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var br = map.unproject([s.x + margin + tileSize, s.y + margin + tileSize]);
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return [br.lat, tl.lng, tl.lat, br.lng];
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}
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if (!this.data)
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return;
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var tileSize = this.options.tileSize;
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var s = tilePoint.multiplyBy(tileSize);
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var map = this._map;
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var margin = 50;
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var bbox = getTileBBox(s, map, tileSize, margin);
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var nodes = this.data.search(bbox);
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if (nodes.length === 0)
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return;
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var ctx = canvas.getContext("2d");
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var radius = 3;
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var a = 1.2;
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var startDistance = 12;
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ctx.beginPath();
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nodes.forEach(function (d) {
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var p = map.project([d.node.nodeinfo.location.latitude, d.node.nodeinfo.location.longitude]);
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var clients = d.node.statistics.clients;
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if (clients === 0)
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return;
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p.x -= s.x;
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p.y -= s.y;
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for (var orbit = 0, i = 0; i < clients; orbit++) {
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var distance = startDistance + orbit * 2 * radius * a;
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var n = Math.floor((Math.PI * distance) / (a * radius));
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var delta = clients - i;
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for (var j = 0; j < Math.min(delta, n); i++, j++) {
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var angle = 2 * Math.PI / n * j;
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var x = p.x + distance * Math.cos(angle + d.startAngle);
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var y = p.y + distance * Math.sin(angle + d.startAngle);
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ctx.moveTo(x, y);
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ctx.arc(x, y, radius, 0, 2 * Math.PI);
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}
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}
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});
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ctx.fillStyle = "rgba(220, 0, 103, 0.7)";
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ctx.fill();
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}
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});
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});
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