hopglass/lib/map/clientlayer.js

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define(["leaflet", "jshashes"],
function (L, jsHashes) {
var MD5 = new jsHashes.MD5()
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return L.TileLayer.Canvas.extend({
setData: function (d) {
this.data = d
//pre-calculate start angles
this.data.all().forEach(function (d) {
var hash = MD5.hex(d.node.nodeinfo.node_id)
d.startAngle = (parseInt(hash.substr(0, 2), 16) / 255) * 2 * Math.PI
})
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this.redraw()
},
drawTile: function (canvas, tilePoint) {
function getTileBBox(s, map, tileSize, margin) {
var tl = map.unproject([s.x - margin, s.y - margin])
var br = map.unproject([s.x + margin + tileSize, s.y + margin + tileSize])
return [br.lat, tl.lng, tl.lat, br.lng]
}
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if (!this.data)
return
var tileSize = this.options.tileSize
var s = tilePoint.multiplyBy(tileSize)
var map = this._map
var margin = 50
var bbox = getTileBBox(s, map, tileSize, margin)
var nodes = this.data.search(bbox)
if (nodes.length === 0)
return
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var ctx = canvas.getContext("2d")
var radius = 3
var a = 1.2
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var startDistance = 12
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ctx.beginPath()
nodes.forEach(function (d) {
var p = map.project([d.node.nodeinfo.location.latitude, d.node.nodeinfo.location.longitude])
var clients = d.node.statistics.clients
if (clients === 0)
return
p.x -= s.x
p.y -= s.y
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for (var orbit = 0, i = 0; i < clients; orbit++) {
var distance = startDistance + orbit * 2 * radius * a
var n = Math.floor((Math.PI * distance) / (a * radius))
var delta = clients - i
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for (var j = 0; j < Math.min(delta, n); i++, j++) {
var angle = 2 * Math.PI / n * j
var x = p.x + distance * Math.cos(angle + d.startAngle)
var y = p.y + distance * Math.sin(angle + d.startAngle)
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ctx.moveTo(x, y)
ctx.arc(x, y, radius, 0, 2 * Math.PI)
}
}
})
ctx.fillStyle = "rgba(153, 118, 16, 0.5)"
ctx.fill()
}
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})
})