map: draw only labels present on map using rtrees

This commit is contained in:
Nils Schneider 2015-04-19 12:22:09 +02:00
parent 9d2318dce1
commit 22b49c1a55
5 changed files with 100 additions and 67 deletions

View file

@ -6,6 +6,13 @@ define(["leaflet"],
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]
}
if (!this.data)
return
@ -13,51 +20,54 @@ define(["leaflet"],
var s = tilePoint.multiplyBy(tileSize)
var map = this._map
function project(coords) {
var p = map.project(new L.LatLng(coords[0], coords[1]))
return {x: p.x - s.x, y: p.y - s.y}
}
var nodes = this.data
var ctx = canvas.getContext("2d")
var margin = 50
var bbox = getTileBBox(s, map, tileSize, margin)
var nodes = this.data.search(bbox)
if (nodes.length === 0)
return
var ctx = canvas.getContext("2d")
var distance = 12
var radius = 3
var a = 1.2
var startAngle = Math.PI
ctx.beginPath()
nodes.forEach(function (d) {
var p = project([d.nodeinfo.location.latitude, d.nodeinfo.location.longitude])
if (p.x + margin < 0 || p.y + margin < 0 || p.x - tileSize - margin > 0 || p.y - tileSize - margin > 0)
return
var p = map.project([d.node.nodeinfo.location.latitude, d.node.nodeinfo.location.longitude])
var clients = d.node.statistics.clients
var clients = d.statistics.clients
if (d.clients === 0)
return
if (clients === 0)
return
var distance = 12
var radius = 3
var a = 1.2
var startAngle = Math.PI
var angle = startAngle
p.x -= s.x
p.y -= s.y
for (var i = 0; i < clients; i++) {
if ((angle - startAngle) > 2 * Math.PI) {
angle = startAngle
distance += 2 * radius * a
}
var angle = startAngle
var x = p.x + distance * Math.cos(angle)
var y = p.y + distance * Math.sin(angle)
ctx.moveTo(x, y)
ctx.arc(x, y, radius, 0, 2 * Math.PI)
var n = Math.floor((Math.PI * distance) / (a * radius))
var angleDelta = 2 * Math.PI / n
angle += angleDelta
for (var i = 0; i < clients; i++) {
if ((angle - startAngle) > 2 * Math.PI) {
angle = startAngle
distance += 2 * radius * a
}
})
ctx.fillStyle = "rgba(153, 118, 16, 0.5)"
ctx.fill()
}
var x = p.x + distance * Math.cos(angle)
var y = p.y + distance * Math.sin(angle)
ctx.moveTo(x, y)
ctx.arc(x, y, radius, 0, 2 * Math.PI)
var n = Math.floor((Math.PI * distance) / (a * radius))
var angleDelta = 2 * Math.PI / n
angle += angleDelta
}
})
ctx.fillStyle = "rgba(153, 118, 16, 0.5)"
ctx.fill()
}
})
})