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map/labels: show less labels on lower zoom levels

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This commit is contained in:
Nils Schneider 2015-07-11 15:52:33 +02:00
parent b6dfaa2e50
commit 93ca06ab75
1 changed files with 13 additions and 8 deletions
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21
lib/map/labelslayer.js
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@ -48,21 +48,26 @@ define(["leaflet", "rbush"],
-offset * Math.sin(loc[2] * 2 * Math.PI)] -offset * Math.sin(loc[2] * 2 * Math.PI)]
} }
function labelRect(p, offset, anchor, label) { 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, var dx = { left: 0,
right: -label.width, right: -width,
center: -label.width / 2 center: -width / 2
} }
var dy = { top: 0, var dy = { top: 0,
ideographic: -label.height, ideographic: -height,
middle: -label.height / 2 middle: -height / 2
} }
var x = p.x + offset[0] + dx[anchor[0]] var x = p.x + offset[0] + dx[anchor[0]]
var y = p.y + offset[1] + dy[anchor[1]] var y = p.y + offset[1] + dy[anchor[1]]
return [x, y, x + label.width, y + label.height] return [x, y, x + width, y + height]
} }
var c = L.TileLayer.Canvas.extend({ var c = L.TileLayer.Canvas.extend({
@ -125,7 +130,7 @@ define(["leaflet", "rbush"],
for (z = maxZoom; z >= d.minZoom; z--) { for (z = maxZoom; z >= d.minZoom; z--) {
var p = map.project(d.position, z) var p = map.project(d.position, z)
var rect = labelRect(p, offset, loc, d) var rect = labelRect(p, offset, loc, d, minZoom, maxZoom, z)
var candidates = trees[z].search(rect) var candidates = trees[z].search(rect)
if (candidates.length > 0) if (candidates.length > 0)
@ -146,7 +151,7 @@ define(["leaflet", "rbush"],
for (var z = maxZoom; z >= best.z; z--) { for (var z = maxZoom; z >= best.z; z--) {
var p = map.project(d.position, z) var p = map.project(d.position, z)
var rect = labelRect(p, d.offset, best.loc, d) var rect = labelRect(p, d.offset, best.loc, d, minZoom, maxZoom, z)
trees[z].insert(rect) trees[z].insert(rect)
} }