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function displayMap(self, map) {
function createQueryData(bbox) {
return "data=[out:json];(" +
"(node[amenity=hospital]("+ bbox +");way[amenity=hospital]("+ bbox +");node(w););" +
"(node[amenity=doctors]("+ bbox +");way[amenity=doctors]("+ bbox +");node(w););" +
"(node[amenity=dentist]("+ bbox +");way[amenity=dentist]("+ bbox +");node(w););" +
"(node(" + bbox + ");relation[type=boundary][boundary=catchment_area];way(r);node(w););" +
");out;";
}
function highlightFeature(e) {
var layer = e.target;
layer.setStyle({
weight: 5,
color: '#666',
dashArray: '',
fillOpacity: 0.1
});
if (!L.Browser.ie && !L.Browser.opera) {
layer.bringToFront();
}
}
function resetHighlight(e) {
self.catchmentAreaLayer.resetStyle(e.target);
}
var hospitalIcon = L.icon({
iconUrl: 'resources/img/hospital.png',
iconSize: [18, 18],
iconAnchor: [9, 9], // point on the icon corresponding to marker's location
popupAnchor: [2, -9] // point to open the popup from relative to iconAnchor
});
var zoom = map.getZoom();
if (zoom < 10) {
return;
}
// Make the bounding box string
var bounds = map.getBounds();
var sw = bounds.getSouthWest();
var ne = bounds.getNorthEast();
bbox = [sw.lat, sw.lng, ne.lat, ne.lng].join(',');
// Get the data
var data = createQueryData(bbox);
// Convert the data to GeoJSON
converter = new op2geojson();
converter.fetch("http://overpass-api.de/api/interpreter", data, zoom, function(data) {
if (jQuery.isEmptyObject(self.amenityLayers)) {
var markers = {};
var catchmentAreaForAmenity = {};
_.each(
_.filter(data.features,
function(feature) {
return _.contains(_.values(feature.properties), "catchment_area");
}),
function(catchmentArea) {
catchmentAreaForAmenity[catchmentArea.properties["subject"]] = catchmentArea;
});
// Now deal with the catchment areas
self.catchmentAreaLayer = L.geoJson(data, {
style: function(feature) {
return {fillColor: 'green',
weight: 2,
opacity: 1,
color: 'black',
dashArray: '3',
fillOpacity: 0.1};
},
onEachFeature: function(feature, layer) {
layer.on({
mouseover: highlightFeature,
mouseout: resetHighlight,
click: function() {
markers[feature.properties.subject].openPopup();
}
});
},
filter: function(feature, layer) {
return _.contains(_.values(feature.properties), "catchment_area");
}
});
_.each(self.amenities, function(amenity, i) {
self.amenityLayers[amenity] = L.geoJson(data, {
style: function(feature) {
return {color: 'red',
fillColor: 'red',
fillOpacity: 0.2,
weight: 10};
},
onEachFeature: function(feature, layer) {
var center;
if (feature.geometry.type === "Point") {
layer.options.icon = hospitalIcon;
center = feature.geometry.coordinates;
} else {
center = feature.geometry.coordinates[0];
}
var catchmentArea = catchmentAreaForAmenity[feature.id];
var format = new OpenLayers.Format.GeoJSON;
var openLayersGeo = format.parseGeometry(catchmentArea.geometry);
var areaInSquareMeters = openLayersGeo.getGeodesicArea();
var areaString = areaInSquareMeters.toFixed(2) + "m" + "2".sup();
if (areaInSquareMeters > 1000000) {
areaString = (areaInSquareMeters / 1000000).toFixed(2) + "km" + "2".sup();
}
var areaProperties = { area: areaString }
layer.bindPopup(self.popupTemplate({ properties: $.extend(feature.properties, areaProperties), coordinate: center }));
markers[feature.id] = layer;
},
filter: function(feature, layer) {
return _.contains(_.values(feature.properties), amenity);
}
});
map.addLayer(self.amenityLayers[amenity]);
self.layersControl.addOverlay(self.amenityLayers[amenity],
self.amenities[i].charAt(0).toUpperCase() + self.amenities[i].slice(1));
});
map.addLayer(self.catchmentAreaLayer);
self.layersControl.addOverlay(self.catchmentAreaLayer, "Catchment Areas");
} else {
self.catchmentAreaLayer.clearLayers();
self.catchmentAreaLayer.addData(data);
_.each(self.amenities, function(amenity, i) {
// Update the data for each amenity layer
self.amenityLayers[amenity].clearLayers();
self.amenityLayers[amenity].addData(data);
});
}
});
}
$(document).ready(function() {
var self = this; // the HTMLDocument
self.popupTemplate = _.template('<a href="http://www.openstreetmap.org/edit?editor=potlatch2&lat=<%= coordinate[1] %>&lon=<%= coordinate[0] %>&zoom=18">\
<img src="resources/img/potlatch.png"></a>\
<a href="http://www.openstreetmap.org/edit?editor=remote&lat=<%= coordinate[1] %>&lon=<%= coordinate[0] %>&zoom=18">\
<img src="resources/img/josm.png"></a>\
<h2>Hospital</h2>\
<table width="100%">\
<tr><td>Name</td><td align="right"><%= properties["name"] %></td></tr>\
<tr><td>Emergency</td><td align="right"><%= properties["emergency"] %></td></tr>\
</table>\
<h2>Catchment Area</h2>\
<table>\
<tr><td>Surface Area</td><td><%= properties["area"] %></td></tr>\
<tr><td>Number of villages</td><td></td></tr>\
<tr><td>Population</td><td></td></tr>\
<tr><td>Furthest Village from health structure</td><td></td></tr>\
<tr><td>Average distance of all villages from health structure</td><td></td></tr>\
</table>');
self.tileLayer = L.tileLayer('http://{s}.www.toolserver.org/tiles/osm-no-labels/{z}/{x}/{y}.png', {
maxZoom: 18,
attribution: 'Map data © <a href="http://openstreetmap.org">OpenStreetMap</a> contributors'
});
var map = L.map( 'map', {
zoom: 12,
layers: [self.tileLayer],
}).setView([12.4822, -11.9463], 11);
// TODO: Not sure why the above call to setView is needed
self.amenities = ["hospital", "doctors", "dentist"];
// This contains the layers for each of the above amenities
self.amenityLayers = {};
self.layersControl = L.control.layers().addTo(map);
L.control.locate().addTo(map);
var legend = L.control({position: 'bottomright'});
legend.onAdd = function (map) {
var div = L.DomUtil.create('div', 'info legend');
div.innerHTML += '<img src="resources/img/hospital.png"> Hospital<br>';
return div;
};
legend.addTo(map);
map.on('moveend', function(e) {
displayMap(self, map);
})
function onLocationFound(e) {
self.currentLocation = e.latlng;
var radius = e.accuracy / 2;
L.marker(e.latlng).addTo(map)
.bindPopup("You are within " + radius + " meters of this point.").openPopup();
}
function onLocationError(e) {
alert(e.message);
}
map.on('locationfound', onLocationFound);
map.on('locationerror', onLocationError);
map.locate({setView: true, maxZoom: 12});
displayMap(self, map);
});
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