🎨 optimizing telnet version

src/Renderer.coffee

@@ -140,10 +140,7 @@ module.exports = class Renderer
             @_drawFeature tile, feature, layer.scale
 
     labels.sort (a, b) ->
-      if a.feature.properties.localrank
+      a.feature.sorty-b.feature.sort
-        a.feature.properties.localrank-b.feature.properties.localrank
-      else
-        a.feature.properties.scalerank-b.feature.properties.scalerank
 
     for label in labels
       @_drawFeature label.tile, label.feature, label.scale
@@ -178,10 +175,7 @@ module.exports = class Renderer
         @canvas.polygon points, feature.color
 
       when "symbol"
-        text = feature.properties["name_"+config.language] or
+        text = feature.label or
-          feature.properties["name_en"] or
-          feature.properties["name"] or
-          feature.properties.house_num or
           genericSymbol = "◉"
 
         return false if @_seen[text] and not genericSymbol

src/Styler.coffee

@@ -42,12 +42,12 @@ module.exports = class Styler
 
     return false
 
-  _replaceConstants: (constants, tree) ->
+  _replaceConstants: (constants, tree, level=0) ->
     for id, node of tree
       switch typeof node
         when 'object'
-          continue if node.constructor.name.match /Stream/
+          continue if level>1
-          @_replaceConstants constants, node
+          @_replaceConstants constants, node, level+1
 
         when 'string'
           if node.charAt(0) is '@'

src/Tile.coffee

@@ -13,6 +13,7 @@ rbush = require 'rbush'
 x256 = require 'x256'
 earcut = require 'earcut'
 
+config = require "./config"
 utils = require "./utils"
 
 class Tile
@@ -74,22 +75,34 @@ class Tile
         # use feature.loadGeometry() again as soon as we got a 512 extent tileset
         geometries = feature.loadGeometry() #@_reduceGeometry feature, 8
 
+        sort = feature.properties.localrank or feature.properties.scalerank
+        label = if feature.properties.$type is "Point"
+          feature.properties["name_"+config.language] or
+          feature.properties.name_en or
+          feature.properties.name or
+          feature.properties.house_num
+        else
+          undefined
+
         if style.type is "fill"
           nodes.push @_addBoundaries true,
-            id: feature.id
+#            id: feature.id
             layer: name
             style: style
-            properties: feature.properties
+            label: label
+            sort: sort
             points: geometries
             color: colorCode
 
         else
+
           for points in geometries
             nodes.push @_addBoundaries false,
-              id: feature.id
+#             id: feature.id
               layer: name
               style: style
-              properties: feature.properties
+              label: label
+              sort: sort
               points: points
               color: colorCode
 

src/TileSource.coffee

@@ -25,6 +25,7 @@ catch
 
 module.exports = class TileSource
   cache: {}
+  cached: []
   modes:
     MBTiles: 1
     VectorTile: 2
@@ -67,6 +68,10 @@ module.exports = class TileSource
     if cached = @cache[[z,x,y].join("-")]
       return Promise.resolve cached
 
+    if @cached.length > 4
+      for tile in @cached.splice 0, Math.abs(4-@cached.length)
+        delete @cache[tile]
+
     switch @mode
       when @modes.MBTiles then @_getMBTile z, x, y
       when @modes.HTTP then @_getHTTP z, x, y
@@ -93,7 +98,10 @@ module.exports = class TileSource
         resolve @_createTile z, x, y, buffer
 
   _createTile: (z, x, y, buffer) ->
-    tile = @cache[[z,x,y].join("-")] = new Tile @styler
+    name = [z,x,y].join("-")
+    @cached.push name
+
+    tile = @cache[name] = new Tile @styler
     tile.load buffer
 
   _initPersistence: ->

src/config.coffee

@@ -3,7 +3,7 @@ module.exports =
 
   # TODO: adapt to osm2vectortiles successor openmaptiles v3)
   # mapscii.me hosts the last available version, 2016-06-20
-  source: "http://mapscii.me/"
+  source: "http://mapscii.me:1337/"
 
   #source: __dirname+"/../mbtiles/regensburg.mbtiles"
 
@@ -16,7 +16,7 @@ module.exports =
   simplifyPolylines: false
 
   # Downloaded files get persisted in ~/.mapscii
-  persistDownloadedTiles: true
+  persistDownloadedTiles: false
 
   tileRange: 14
   projectSize: 256