Carto stylesheet; Cycle focused overlay based on OSM data

configure.py

#!/usr/bin/env python

# Copyright (c) 2011, Development Seed, Inc.
#               2011, Andrew Harvey <andrew.harvey4@gmail.com>
#               All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in
#       the documentation and/or other materials provided with the
#       distribution.
#     * Neither the name of the Development Seed, Inc. nor the names of
#       its contributors may be used to endorse or promote products
#       derived from this software without specific prior written
#       permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
# OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


import json
from sys import path
from os.path import join
import argparse

#################################
## argparse

parser = argparse.ArgumentParser(description='Configure an MML file with datasource settings')
parser.add_argument('--host', default='localhost')
parser.add_argument('--port', default='5432')
parser.add_argument('--dbname', default='osm')
parser.add_argument('--user', default='osm')
parser.add_argument('--password', default='osm')

# Increase performance if you are only rendering a particular area by
# specifying a bounding box to restrict queries. Format is "XMIN,YMIN,XMAX,YMAX" in the
# same units as the database (probably spherical mercator meters). The
# whole world is "-20037508.34,-20037508.34,20037508.34,20037508.34".
# Leave blank to let Mapnik estimate.
parser.add_argument('--extent', default='')

args = parser.parse_args()

#################################
## configure mml

mml = join(path[0], 'cycle-overlay/cycle-overlay.mml')

with open(mml, 'r') as f:
  newf = json.loads(f.read())
f.closed

with open(mml, 'w') as f:
  for layer in newf["Layer"]:
    layer["Datasource"]["host"] = args.host
    layer["Datasource"]["port"] = args.port
    layer["Datasource"]["dbname"] = args.dbname
    layer["Datasource"]["user"] = args.user
    layer["Datasource"]["password"] = args.password
    layer["Datasource"]["extent"] = args.extent
  f.write(json.dumps(newf, indent=2))
f.closed

cycle-overlay.mml

{
  "srs": "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over",
  "Stylesheet": [
    "cycle.mss"
  ],
  "Layer": [
    {
      "geometry": "linestring",
      "name": "cycle-route",
      "id": "cycle-route",
      "srs": "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over",
      "class": "cycle",
      "Datasource": {
        "table": "(\n SELECT way, lcn, rcn, ncn\n FROM planet_osm_line\n WHERE (lcn = 'yes' OR rcn = 'yes' OR ncn = 'yes')\n) AS cycleroutes",
        "key_field": "",
        "geometry_field": "way",
        "extent": "",
        "type": "postgis",
        "dbname": "",
        "host": "",
        "port": "",
        "user": "",
        "password": ""
      }
    },
    {
      "geometry": "linestring",
      "name": "cycle-lane",
      "id": "cycle-lane",
      "srs": "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over",
      "class": "cycle",
      "Datasource": {
        "table": "(\n SELECT way, tags->'cycleway' as cycleway\n FROM planet_osm_line\n WHERE tags->'cycleway' in ('lane', 'opposite_lane')\n) AS cyclelanes",
        "key_field": "",
        "geometry_field": "way",
        "extent": "",
        "type": "postgis",
        "dbname": "",
        "host": "",
        "port": "",
        "user": "",
        "password": ""
      }
    },
    {
      "geometry": "linestring",
      "name": "cycle-path",
      "id": "cycle-path",
      "srs": "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over",
      "class": "cycle",
      "Datasource": {
        "table": "(\n SELECT way, highway\n FROM planet_osm_line\n WHERE highway in ('cycleway')\n) AS cyclepath",
        "key_field": "",
        "geometry_field": "way",
        "extent": "",
        "type": "postgis",
        "dbname": "",
        "host": "",
        "port": "",
        "user": "",
        "password": ""
      }
    },
    {
      "geometry": "point",
      "name": "cycle-poi",
      "id": "cycle-poi",
      "srs": "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over",
      "class": "",
      "Datasource": {
        "table": "(\n (\n  SELECT\n    way,\n    amenity,\n    shop,\n    name,\n    tags->'capacity' as capacity\n  FROM\n    planet_osm_point\n  WHERE\n    amenity in ('bicycle_parking', 'drinking_water', 'toilets') OR\n    shop in ('bicycle')\n ) UNION (\n   SELECT\n    way,\n    amenity,\n    shop,\n    name,\n    tags->'capacity' as capacity\n  FROM\n    planet_osm_polygon\n  WHERE\n    amenity in ('bicycle_parking', 'drinking_water', 'toilets') OR\n    shop in ('bicycle')\n )\n) AS cyclepoi",
        "key_field": "",
        "geometry_field": "way",
        "extent": "",
        "type": "postgis",
        "dbname": "",
        "host": "",
        "port": "",
        "user": "",
        "password": ""
      }
    }
  ],
  "name": "cycle-overlay",
  "description": "A simple transparent map overlay showing cycle lanes, cycle paths and cycle routes."
}

cycle.mss

/* 
 * Cycle lanes, paths and routes OSM style sheet, intended as an
 * overlay for other maps.
 *
 * Author: Andrew Harvey <andrew.harvey4@gmail.com>
 * License: CC0 http://creativecommons.org/publicdomain/zero/1.0/
 * To the extent possible under law, the person who associated CC0
 * with this work has waived all copyright and related or neighboring
 * rights to this work.
 */

.cycle {
   line-join: round;
   line-cap: round;
}

/* on road marked route, but no lane */
#cycle-route {
  line-color: #61b6f7;
  line-opacity: 0.5;

  [zoom<10] { line-width: 1  }
  [zoom=10] { line-width: 2  }
  [zoom=11] { line-width: 2  }
  [zoom=12] { line-width: 4  }
  [zoom=13] { line-width: 6  }
  [zoom=14] { line-width: 8  }
  [zoom=15] { line-width: 10 }
  [zoom=16] { line-width: 12 }
  [zoom=17] { line-width: 15 }
  [zoom>17] { line-width: 20 }
}

/* on road lane */
#cycle-lane {
  line-color: #050060;
  line-width: 5;

  /* thinner than routes so we can see cycle lanes which are part of routes */
  [zoom<10] { line-width: 0.5 }
  [zoom=10] { line-width: 1   }
  [zoom=11] { line-width: 1.2   }
  [zoom=12] { line-width: 1.5 }
  [zoom=13] { line-width: 1.75   }
  [zoom=14] { line-width: 2.5   }
  [zoom=15] { line-width: 3   }
  [zoom=16] { line-width: 4   }
  [zoom=17] { line-width: 6 }
  [zoom>17] { line-width: 9  }
}

/* off road path */
#cycle-path {
  line-color: #050060;

  [zoom<10] { line-width: 0.5 ; line-dasharray: 0.5,1 }
  [zoom=10] { line-width: 1 ; line-dasharray: 0.5,1 }
  [zoom=11] { line-width: 1.5 ; line-dasharray: 1,2 }
  [zoom=12] { line-width: 1.5 ; line-dasharray: 1,3 }
  [zoom=13] { line-width: 1.75 ; line-dasharray: 1,4 }
  [zoom=14] { line-width: 2.5 ; line-dasharray: 1,5 }
  [zoom=15] { line-width: 3 ; line-dasharray: 1,5 }
  [zoom=16] { line-width: 4; line-dasharray: 1,7 }
  [zoom=17] { line-width: 6; line-dasharray: 1,10 }
  [zoom>17] { line-width: 9; line-dasharray: 1,12 }
}

/* cycle related POI */
#cycle-poi[zoom > 14] {
  [amenity='toilets'] {
    point-file: url('/usr/share/icons/sjjb/png/amenity/toilets.n.000000.16.png');
  }
  
  [amenity='bicycle_parking'] {
    point-file: url('/usr/share/icons/sjjb/png/transport/parking_bicycle.n.0092DA.16.png');
  }
  
  [shop='bicycle'] {
    point-file: url('/usr/share/icons/sjjb/png/shopping/bicycle.n.AC39AC.16.png');
    ::label {
      text-name: "[name]";
      text-face-name: "Liberation Sans Bold";
      text-fill: #AC39AC;
      text-placement: point;
      text-wrap-width: 75;
      text-halo-radius: 1.5;
      text-size: 10;
      text-dy: 12;
    }
  }
  
  [amenity='drinking_water'] {
    point-file: url('/usr/share/icons/sjjb/png/food/drinkingtap.n.39AC39.16.png');
  }
}

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