hopglass/lib/map/clientlayer.js
2017-03-21 22:53:36 +01:00

79 lines
2.2 KiB
JavaScript

define(["leaflet"],
function (L) {
"use strict";
return L.TileLayer.Canvas.extend({
setData: function (d) {
this.data = d;
//pre-calculate start angles
this.data.all().forEach(function (d) {
d.startAngle = (parseInt(d.node.nodeinfo.node_id.substr(10, 2), 16) / 255) * 2 * Math.PI;
});
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;
}
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;
}
var ctx = canvas.getContext("2d");
var radius = 3;
var a = 1.2;
var startDistance = 12;
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;
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;
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);
ctx.moveTo(x, y);
ctx.arc(x, y, radius, 0, 2 * Math.PI);
}
}
});
ctx.fillStyle = "rgba(220, 0, 103, 0.7)";
ctx.fill();
}
});
});