From 3b05be5f142f6b47c0e5cf71694843ed01a5d082 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michael=20Stra=C3=9Fburger?= <codepoet@cpan.org>
Date: Sat, 1 Oct 2016 04:47:10 +0200
Subject: [PATCH] :art: allow specific feature selection in render order
 (road->water->road:bridge)

---
 src/Renderer.coffee | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/Renderer.coffee b/src/Renderer.coffee
index a797a54..d8cab35 100644
--- a/src/Renderer.coffee
+++ b/src/Renderer.coffee
@@ -21,10 +21,11 @@ module.exports = class Renderer
 
     #"poi_label", "water",
     drawOrder: [
-      "water"
       "admin"
       "building"
       "road"
+      "water"
+      "road:structure=bridge"
 
       "place_label"
       "poi_label"
@@ -106,6 +107,12 @@ module.exports = class Renderer
 
   _drawLayers: ->
     for layer in @config.drawOrder
+      if layer.indexOf(':') isnt -1
+        [layer, filter] = layer.split /:/
+        [filterField, filterValue] = filter.split /=/
+      else
+        filter = false
+
       continue unless @features?[layer]
 
       scale = Math.pow 2, @zoom
@@ -122,7 +129,8 @@ module.exports = class Renderer
       features = @features[layer].tree.search box
       @notify "rendering #{features.length} #{layer} features.."
       for feature in features
-        @_drawFeature layer, feature, scale
+        if not filter or feature.data.properties[filterField] is filterValue
+          @_drawFeature layer, feature, scale
 
   _drawFeature: (layer, data, scale) ->
     feature = data.data