75 lines
1.9 KiB
JavaScript
75 lines
1.9 KiB
JavaScript
define(["leaflet"],
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function (L) {
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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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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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var startAngle = Math.PI
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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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var distance = startDistance
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var angle = startAngle
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for (var i = 0; i < clients; i++) {
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if ((angle - startAngle) > 2 * Math.PI) {
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angle = startAngle
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distance += 2 * radius * a
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}
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var x = p.x + distance * Math.cos(angle)
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var y = p.y + distance * Math.sin(angle)
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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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var n = Math.floor((Math.PI * distance) / (a * radius))
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var angleDelta = 2 * Math.PI / n
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angle += angleDelta
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}
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})
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ctx.fillStyle = "rgba(153, 118, 16, 0.5)"
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ctx.fill()
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}
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})
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})
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