feat: Add roller coaster rendering

openstreetmap-carto.lua

@@ -227,6 +227,9 @@ local roads_info = {
         construction    = {z = 400, roads = false},
         platform        = {z = 90,  roads = false},
     },
+    roller_coaster = {
+        track           = {z = 300, roads = true},
+    },
     aeroway = {
         runway          = {z = 60,  roads = false},
         taxiway         = {z = 50,  roads = false},

openstreetmap-carto.style

@@ -41,6 +41,7 @@ node,way   railway      text         linear
 node,way   ref          text         linear
 node,way   religion     text         linear
 way        route        text         linear
+way        roller_coaster      text  linear
 way        service      text         linear
 node,way   shop         text         polygon
 way        surface      text         linear

project.mml

@@ -1005,6 +1005,23 @@ Layer:
         ) AS guideways
     properties:
       minzoom: 11
+  - id: roller-coaster
+    geometry: linestring
+    <<: *extents
+    Datasource:
+      <<: *osm2pgsql
+      table: |-
+        (SELECT
+            way,
+            roller_coaster,
+            CASE WHEN (tunnel = 'yes' OR tunnel = 'building_passage' OR covered = 'yes') THEN 'yes' ELSE 'no' END AS tunnel,
+            name
+          FROM planet_osm_line l
+          ORDER BY
+            COALESCE(layer, 0) -- put top layered track first
+        ) AS roller_coaster
+    properties:
+      minzoom: 11
   - id: entrances
     geometry: point
     <<: *extents
@@ -1950,6 +1967,22 @@ Layer:
         ) AS railways_text_name
     properties:
       minzoom: 11
+  - id: roller-coaster-text-name
+    geometry: linestring
+    <<: *extents
+    Datasource:
+      <<: *osm2pgsql
+      table: |-
+        (SELECT
+            way,
+            roller_coaster,
+            name
+          FROM planet_osm_line l
+          ORDER BY
+            COALESCE(layer, 0) -- put top layered track first
+        ) AS roller_coaster_text_name
+    properties:
+      minzoom: 11
   - id: roads-text-ref-minor
     geometry: linestring
     <<: *extents

style/roads.mss

@@ -3520,6 +3520,49 @@ tertiary is rendered from z10 and is not included in osm_planet_roads. */
   }
 }
 
+#roller-coaster {
+  [roller_coaster = 'track'] {
+    [zoom >= 15] {
+      line-width: 2;
+      line-color: #707070;
+      line-join: round;
+      b/line-width: 1;
+      b/line-color: @road-fill;
+      b/line-dasharray: 0,0.2,1,0.2;
+      b/line-join: round;
+    }
+    [zoom >= 16] {
+      line-width: 3;
+      b/line-width: 1.5;
+      b/line-dasharray: 0,0.3,3,0.3;
+    }
+    [zoom >= 17] {
+      line-width: 4.5;
+      b/line-width: 2.25;
+      b/line-dasharray: 0,0.45,4.5,0.45;
+    }
+    [zoom >= 18] {
+      line-width: 6;
+      b/line-width: 3;
+      b/line-dasharray: 0,0.6,6,0.6;
+    }
+    [zoom >= 19] {
+      line-width: 7.5;
+      b/line-width: 3.75;
+      b/line-dasharray: 0,0.75,7.5,0.75;
+    }
+    [zoom >= 20] {
+      line-width: 10;
+      b/line-width: 5;
+      b/line-dasharray: 0,1,10,1;
+    }
+    [tunnel = 'yes'] { 
+      line-color: lighten(#707070, 10%);
+      b/line-color: lighten(@road-fill, 5%);
+    }
+  }
+}
+
 #roads-text-ref-low-zoom[zoom < 13] {
   [highway = 'motorway'][zoom >= 10],
   [highway = 'trunk'][zoom >= 11],
@@ -4206,3 +4249,25 @@ tertiary is rendered from z10 and is not included in osm_planet_roads. */
     }
   }
 }
+
+#roller-coaster-text-name {
+  [roller_coaster = 'track'] {
+    [zoom >= 17] {
+      text-name: "[name]";
+      text-fill: #666666;
+      text-size: 10;
+      text-dy: 6;
+      text-spacing: 900;
+      text-clip: false;
+      text-placement: line;
+      text-face-name: @book-fonts;
+      text-halo-radius: @standard-halo-radius;
+      text-halo-fill: @standard-halo-fill;
+      text-repeat-distance: @railway-text-repeat-distance;
+    }
+    [zoom >= 19] {
+      text-size: 11;
+      text-dy: 7;
+    }
+  }
+}