From 40f11f8748cc704fe6f0c5e89cd56d9a37ba2aa4 Mon Sep 17 00:00:00 2001
From: Harry Cutts <eternal.linux@gmail.com>
Date: Sun, 2 Dec 2012 13:08:31 +0000
Subject: Show polygon hospitals as well as nodes

---
 resources/map.js        | 10 ++++++++--
 resources/op2geojson.js | 36 +++++++++++++++++++++++++++++++++++-
 2 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/resources/map.js b/resources/map.js
index 50fdd87..35ea6ef 100644
--- a/resources/map.js
+++ b/resources/map.js
@@ -34,6 +34,12 @@ $(document).ready(function() {
 		$('.leaflet-control-layers-selector').first().trigger('click')
 	}
 
+	function createQueryURL(bbox) {
+		return "http://overpass-api.de/api/interpreter?" +
+				"data=[out:json];(node[amenity=hospital](" + bbox +
+				");way[amenity=hospital]("+ bbox +");node(w););out;";
+	}
+
 	map.on('hospitalsfetched', addHospitalLayer);
 	map.on('hospitalsfetched', initFilters);
 	map.on('locationfound', onLocationFound);
@@ -50,7 +56,7 @@ $(document).ready(function() {
 		var sw = bounds.getSouthWest();
 		var ne = bounds.getNorthEast();
 		bbox = [sw.lat, sw.lng, ne.lat, ne.lng].join(',');
-		var url = "http://overpass-api.de/api/interpreter?data=[out:json];node[amenity=hospital](" + bbox + ");out;";
+		var url = createQueryURL(bbox);
 		converter = new op2geojson();
 		converter.fetch(url, function(data) {
 			self.hospitals = data;
@@ -85,7 +91,7 @@ $(document).ready(function() {
 	}
 
 	function geojsonLayer() {
-        url = "http://overpass-api.de/api/interpreter?data=[out:json];node[amenity=hospital](52.34,13.3,52.52,13.6);out;";
+        url = createQueryURL(52.34,13.3,52.52,13.6);
 		converter = new op2geojson();
 		converter.fetch(url, function(data) {
 			self.hospitals = data;
diff --git a/resources/op2geojson.js b/resources/op2geojson.js
index 74431d3..55be9e3 100644
--- a/resources/op2geojson.js
+++ b/resources/op2geojson.js
@@ -8,10 +8,21 @@ op2geojson = function() {
 	instance.fetch = function(url, callback) {
     	$.getJSON(url, { format: "json" },
 			function(data) {
+				// List all of the returned nodes
+				var nodes = [];
+				$.each(data.elements, function(i, item) {
+					if (item.type === 'node') {
+						nodes[item.id] = item;
+					}
+				});
+
+				// Add nodes and ways to the layer
 				var features = [];
 				$.each(data.elements, function(i, item) {
-					if( item.type === 'node' ) {
+					if( item.type === 'node' && item.tags != null ) {
 						features.push( instance.point(item) );
+					} else if (item.type === 'way') {
+						features.push( instance.lineString(item, nodes) );
 					}
 				});
 				geojson = instance.featureCollection(features);
@@ -33,6 +44,29 @@ op2geojson = function() {
 		return point;
 	}
 
+	instance.lineString = function(way, nodeArray) {
+		// Get the node coordinates from nodeArray
+		var coordinates = [];
+		for (id in way.nodes) {
+			var node = nodeArray[way.nodes[id]];
+			coordinates.push([node.lon,node.lat]);
+		}
+
+		// Create the LineString
+		var lineString = {
+			"type" : "Feature",
+			"geometry" : {
+				"type" : "LineString",
+				"coordinates" : coordinates
+			},
+			"properties" : {}
+		};
+
+		// Add the tags
+		_.extend(lineString.properties, way.tags);
+		return lineString;
+	}
+
 	instance.featureCollection = function(features) {
 		collection = {
 			"type" : "FeatureCollection",
-- 
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