define(["leaflet", "rbush"], function (L, rbush) { var labelLocations = [["left", "middle", 0 / 8], ["center", "top", 6 / 8], ["right", "middle", 4 / 8], ["left", "top", 7 / 8], ["left", "ideographic", 1 / 8], ["right", "top", 5 / 8], ["center", "ideographic", 2 / 8], ["right", "ideographic", 3 / 8]]; var fontFamily = "Roboto"; var nodeRadius = 4; var ctx = document.createElement("canvas").getContext("2d"); function measureText(font, text) { ctx.font = font; return ctx.measureText(text); } function mapRTree(d) { var o = [d.position.lat, d.position.lng, d.position.lat, d.position.lng]; o.label = d; return o; } function prepareLabel(fillStyle, fontSize, offset, stroke, minZoom) { return function (d) { var font = fontSize + "px " + fontFamily; return { position: L.latLng(d.nodeinfo.location.latitude, d.nodeinfo.location.longitude), label: d.nodeinfo.hostname, offset: offset, fillStyle: fillStyle, height: fontSize * 1.2, font: font, stroke: stroke, minZoom: minZoom, width: measureText(font, d.nodeinfo.hostname).width }; }; } function calcOffset(offset, loc) { return [offset * Math.cos(loc[2] * 2 * Math.PI), -offset * Math.sin(loc[2] * 2 * Math.PI)]; } function labelRect(p, offset, anchor, label, minZoom, maxZoom, z) { var margin = 1 + 1.41 * (1 - (z - minZoom) / (maxZoom - minZoom)); var width = label.width * margin; var height = label.height * margin; var dx = { left: 0, right: -width, center: -width / 2 }; var dy = { top: 0, ideographic: -height, middle: -height / 2 }; var x = p.x + offset[0] + dx[anchor[0]]; var y = p.y + offset[1] + dy[anchor[1]]; return [x, y, x + width, y + height]; } return L.TileLayer.Canvas.extend({ onAdd: function (map) { L.TileLayer.Canvas.prototype.onAdd.call(this, map); if (this.data) { this.prepareLabels(); } }, setData: function (d) { this.data = d; if (this._map) { this.prepareLabels(); } }, prepareLabels: function () { var d = this.data; // label: // - position (WGS84 coords) // - offset (2D vector in pixels) // - anchor (tuple, textAlignment, textBaseline) // - minZoom (inclusive) // - label (string) // - color (string) var labelsOnline = d.online.map(prepareLabel("rgba(0, 0, 0, 0.9)", 10, 8, true, 13)); var labelsOffline = d.offline.map(prepareLabel("rgba(212, 62, 42, 0.9)", 9, 5, false, 16)); var labelsNew = d.new.map(prepareLabel("rgba(48, 99, 20, 0.9)", 11, 8, true, 0)); var labelsLost = d.lost.map(prepareLabel("rgba(212, 62, 42, 0.9)", 11, 8, true, 0)); var labels = [] .concat(labelsNew) .concat(labelsLost) .concat(labelsOnline) .concat(labelsOffline); var minZoom = this.options.minZoom; var maxZoom = this.options.maxZoom; var trees = []; var map = this._map; function nodeToRect(z) { return function (d) { var p = map.project(d.position, z); return [p.x - nodeRadius, p.y - nodeRadius, p.x + nodeRadius, p.y + nodeRadius]; }; } for (var z = minZoom; z <= maxZoom; z++) { trees[z] = rbush(9); trees[z].load(labels.map(nodeToRect(z))); } labels = labels.map(function (d) { var best = labelLocations.map(function (loc) { var offset = calcOffset(d.offset, loc); var z; for (z = maxZoom; z >= d.minZoom; z--) { var p = map.project(d.position, z); var rect = labelRect(p, offset, loc, d, minZoom, maxZoom, z); var candidates = trees[z].search(rect); if (candidates.length > 0) { break; } } return {loc: loc, z: z + 1}; }).filter(function (d) { return d.z <= maxZoom; }).sort(function (a, b) { return a.z - b.z; })[0]; if (best !== undefined) { d.offset = calcOffset(d.offset, best.loc); d.minZoom = best.z; d.anchor = best.loc; for (var z = maxZoom; z >= best.z; z--) { var p = map.project(d.position, z); var rect = labelRect(p, d.offset, best.loc, d, minZoom, maxZoom, z); trees[z].insert(rect); } return d; } else { return undefined; } }).filter(function (d) { return d !== undefined; }); this.margin = 16; if (labels.length > 0) { this.margin += labels.map(function (d) { return d.width; }).sort().reverse()[0]; } this.labels = rbush(9); this.labels.load(labels.map(mapRTree)); this.redraw(); }, drawTile: function (canvas, tilePoint, zoom) { 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.labels) { return; } var tileSize = this.options.tileSize; var s = tilePoint.multiplyBy(tileSize); var map = this._map; function projectNodes(d) { var p = map.project(d.label.position); p.x -= s.x; p.y -= s.y; return {p: p, label: d.label}; } var bbox = getTileBBox(s, map, tileSize, this.margin); var labels = this.labels.search(bbox).map(projectNodes); var ctx = canvas.getContext("2d"); ctx.lineWidth = 5; ctx.strokeStyle = "rgba(255, 255, 255, 0.8)"; ctx.miterLimit = 2; function drawLabel(d) { ctx.font = d.label.font; ctx.textAlign = d.label.anchor[0]; ctx.textBaseline = d.label.anchor[1]; ctx.fillStyle = d.label.fillStyle; if (d.label.stroke) { ctx.strokeText(d.label.label, d.p.x + d.label.offset[0], d.p.y + d.label.offset[1]); } ctx.fillText(d.label.label, d.p.x + d.label.offset[0], d.p.y + d.label.offset[1]); } labels.filter(function (d) { return zoom >= d.label.minZoom; }).forEach(drawLabel); } }); });