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leaflet_embed_small.js
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leaflet_embed_small.js
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var map;
var layersControl;
var layersControl_shown = false;
var zoomControl;
var scaleControl;
var ajaxRequest;
var current_zoom = 9;
var current_layer;
/* ------------------------------------------------------------------------------
* The "live" version on map.atownsend.org.uk does not display "local" maps.
* Test versions do, and also display "Hetzner" maps too.
* The code supports switching to and from local maps, even if it isn't in
* "basemaps"
* In "live", localUrl is defined identically to hetznerUrl.
* The permalink code requires that each layer has a letter associated with it
*
* Basemaps
* L Local
* H Hetzner
* O OSM
* D osm.de
* 6 OS OpenData StreetView, from 2016
* 2 OS OpenMap Local, from April 2024
* U Humanitarian from osm.fr
*
* Overlays
* B Boundaries
* G GPS traces
* F Current flooding
* P Local authority public rights of way
* N No-visibility paths
* K OSMUK cadastral parcels
* C Reserved for contours but not yet implemented.
*
* ------------------------------------------------------------------------------ */
var localUrl='//map.atownsend.org.uk/hot/{z}/{x}/{y}.png';
var hetznerUrl='//map.atownsend.org.uk/hot/{z}/{x}/{y}.png';
var osmUrl='//tile.openstreetmap.org/{z}/{x}/{y}.png';
var deUrl='//a.tile.openstreetmap.de/tiles/osmde/{z}/{x}/{y}.png';
var os201604Url='//{s}.os.openstreetmap.org/layer/gb_os_sv_2016_04/{z}/{x}/{y}.png';
var oslocalUrl='//{s}.os.openstreetmap.org/layer/gb_os_om_local_2024_04/{z}/{x}/{y}.png';
var humUrl='http://77.95.65.40/hot/{z}/{x}/{y}.png';
/* ------------------------------------------------------------------------------
* On installations other than map.atownsend.org.uk, the URLs below will normally
* point locally rather than to map.atownsend.org.uk .
* ------------------------------------------------------------------------------ */
var boundaryUrl='//map.atownsend.org.uk/hot6/{z}/{x}/{y}.png';
var gps2Url='//gps-b.tile.openstreetmap.org/lines/{z}/{x}/{y}.png';
var floodedUrl='//map.atownsend.org.uk/hot4/{z}/{x}/{y}.png';
var LA_ProwUrl='https://osm.cycle.travel/rights_of_way/{z}/{x}/{y}.png';
var novisUrl='//map.atownsend.org.uk/hot5/{z}/{x}/{y}.png';
var osmukcadUrl='https://tiles.osmuk.org/PropertyBoundaries/{z}/{x}/{y}.png';
var hash;
/* ------------------------------------------------------------------------------
* Layer attributions are added together and displayed at the bottom right of
* the screen.
* ------------------------------------------------------------------------------ */
var osmAttrib='Map data © <a href="https://www.openstreetmap.org/copyright">OpenStreetMap contributors</a>';
var osAttrib='Map data © <a href="https://www.ordnancesurvey.co.uk/business-government/products/open-map-local">Ordnance Survey</a> under <a href="https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/">OGL v3.0</a>';
var humAttrib='Map data © <a href="https://www.openstreetmap.org/copyright">OpenStreetMap contributors</a>. Tiles style by <a href="https://www.hotosm.org/">Humanitarian OpenStreetMap Team</a> hosted by <a href="https://openstreetmap.fr/">OpenStreetMap France</a>';
var eaAttrib='current flooding © <a href="https://check-for-flooding.service.gov.uk/find-location">Environment Agency</a> under <a href="https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/">OGL v3.0</a>';
var laAttrib='PRoW overlay © local authorities under <a href="https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/">OGL v3.0</a> & <a href="https://rowmaps.com">rowmaps.com</a>';
var osmukcadAttrib='<a href="https://osmuk.org/cadastral-parcels/">OSMUK</a> cadastral parcels: Contains public sector information licensed under <a href="https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/">OGL v3.0</a>';
/* ------------------------------------------------------------------------------
* A note about layer min and max zoom levels:
*
* My renderd-generated layers are valid from 0 to 24 only.
* The "standard" OSM tiles are valid from 0 to 19.
* OS OpenData_StreetView is valid from 0 to 19 (which is actually an overzoomed 18)
* The GPS layer is valid from 0 to 24, but we only go to 20 here.
*
* Leaflet supports a lower maxZoom than maxNativeZoom (i.e. overzoom).
* ------------------------------------------------------------------------------ */
var localLayer = new L.TileLayer( localUrl, {minZoom: 0, maxZoom: 25, maxNativeZoom: 24, attribution: osmAttrib });
var hetznerLayer = new L.TileLayer( hetznerUrl, {minZoom: 0, maxZoom: 25, maxNativeZoom: 24, attribution: osmAttrib });
var osmLayer = new L.TileLayer( osmUrl, {minZoom: 0, maxZoom: 20, maxNativeZoom: 19, attribution: osmAttrib });
var deLayer = new L.TileLayer( deUrl, {minZoom: 0, maxZoom: 20, maxNativeZoom: 19, attribution: osmAttrib });
var os201604Layer = new L.TileLayer( os201604Url, {minZoom: 0, maxZoom: 19, attribution: osAttrib });
var oslocalLayer = new L.TileLayer( oslocalUrl, {minZoom: 0, maxZoom: 19, attribution: osAttrib });
var humLayer = new L.TileLayer( humUrl, {minZoom: 0, maxZoom: 19, attribution: humAttrib });
var boundaryLayer = new L.TileLayer( boundaryUrl, {minZoom: 0, maxZoom: 25, maxNativeZoom: 24, attribution: osmAttrib });
var gps2Layer = new L.TileLayer( gps2Url, {minZoom: 0, maxZoom: 20, attribution: osmAttrib });
var floodedLayer = new L.TileLayer( floodedUrl, {minZoom: 0, maxZoom: 25, maxNativeZoom: 24, attribution: eaAttrib });
var LA_ProwLayer = new L.TileLayer( LA_ProwUrl, {minZoom: 0, maxZoom: 25, maxNativeZoom: 18, attribution: laAttrib });
var novisLayer = new L.TileLayer( novisUrl, {minZoom: 0, maxZoom: 25, maxNativeZoom: 24, attribution: osmAttrib });
var osmukcadLayer = new L.TileLayer( osmukcadUrl, {minZoom: 18, maxZoom: 25, maxNativeZoom: 20, attribution: osmukcadAttrib });
function initmap()
{
// set up the map
/* ------------------------------------------------------------------------------
* Set up the map with no zoomControl (there's a button to add it), a map centre
* of near Milford, zoom 9 and the current layer being my SomeoneElse-Style layer.
* ------------------------------------------------------------------------------ */
map = new L.Map('map', {
zoomControl: false,
center: new L.LatLng( 53, -1.5 ),
zoom: current_zoom,
layers: [ hetznerLayer ]
});
map.attributionControl.setPrefix(false);
/* ------------------------------------------------------------------------------
* The "live" version on map.atownsend.org.uk does not display "local" maps.
* Test versions do, and also display "Hetzner" maps too.
*
* In those cases, the definition below will be:
* "Local": localLayer,
* "Hetzner": hetznerLayer,
*
* The code supports switching to and from local maps, even if it isn't in
* "basemaps".
* localUrl is defined above identically to hetznerUrl.
* ------------------------------------------------------------------------------ */
var baseMaps = {
"Default": hetznerLayer,
"OSM": osmLayer,
"DE": deLayer,
"OS 201604": os201604Layer,
"OS OM Local": oslocalLayer,
"Humanitarian": humLayer
};
var overlayMaps = {
"Boundaries": boundaryLayer,
"GPS": gps2Layer,
"Current flooding": floodedLayer,
"LA PRoW": LA_ProwLayer,
"No vis paths": novisLayer,
"OSMUK cadastral": osmukcadLayer
};
/* ------------------------------------------------------------------------------
* "layersControl" is declared at the top and used here in "initmap" and also
* in the button handlers for "Control" (to show the controls on the map) and
* "Off" (to turn them off). The map is created with no layers control by
* default. We declare one at the top of the code and turn it on and off within
* the same functions.
* ------------------------------------------------------------------------------ */
layersControl = new L.Control.Layers( baseMaps, overlayMaps );
zoomControl = new L.Control.Zoom( baseMaps );
map.on( 'locationfound', location_success );
map.on( 'locationerror', location_fail );
/* ------------------------------------------------------------------------------
* See https://leafletjs.com/reference.html#map-baselayerchange for these events:
* ------------------------------------------------------------------------------ */
map.on('baselayerchange', function (e) {
any_layer_change( e );
});
map.on('overlayadd', function (e) {
any_layer_change( e );
});
map.on('overlayremove', function (e) {
any_layer_change( e );
});
/* ------------------------------------------------------------------------------
* Add a permalink to the map URL
* ------------------------------------------------------------------------------ */
hash = new L.Hash(map)
/* ------------------------------------------------------------------------------
* What state is the map in and what does the URL look like?
* If some layers are defined in there, try and load them.
* ------------------------------------------------------------------------------ */
console.log('Initial location.hash', location.hash);
hash2 = new L.Hash.parseHash(location.hash);
console.log('new hash2.meta', hash2.meta);
hash.setHashMeta( hash2.meta, false);
for (var i = 0; i < hash2.meta.length; i++)
{
console.log("hash.meta[i]", hash2.meta[i]);
process_newmeta(hash2.meta[i]);
}
console.log('After process_newmeta array calls');
map.on("hashmetainit", function(initState) {
console.log('hashmetainit detected', initState.meta);
})
/* ------------------------------------------------------------------------------
* Next we need some way of knowing that a user has used a permalink resulting in
* a different map layer.
* ------------------------------------------------------------------------------ */
map.on("hashmetachange", function(newState) {
console.log('hashmetachange detected', newState.meta);
/* ------------------------------------------------------------------------------
* Remove any overlays. If they're in the URL, they will get re-added.
* ------------------------------------------------------------------------------ */
console.log('before overlay deletion');
map.removeLayer(boundaryLayer);
map.removeLayer(gps2Layer);
map.removeLayer(LA_ProwLayer);
map.removeLayer(novisLayer);
map.removeLayer(osmukcadLayer);
console.log('after overlay deletion');
/* ------------------------------------------------------------------------------
* newState.meta is a string with layers in it, e.g. "HB" for the "Hetzner" base
* layer and te "Boundaries" overlay layer.
* There will be exactly one base layer and 0 or more overlay layers.
* "any_layer_change" below prevents the meta from having more than one base
* layer in it.
*
* For each base or overlay layer, add it (and if it is a base layer remove the
* previous base layer).
* ------------------------------------------------------------------------------ */
for (var i = 0; i < newState.meta.length; i++)
{
console.log("newState.meta[i]", newState.meta[i]);
process_newmeta(newState.meta[i]);
}
});
console.log('Initialisation completed');
}
function process_newmeta( newmeta )
{
/* ------------------------------------------------------------------------------
* The "live" version on map.atownsend.org.uk does not display "local" maps.
* The code supports switching to and from local maps, even if it isn't in
* "basemaps".
* localUrl is defined above identically to hetznerUrl.
* ------------------------------------------------------------------------------ */
console.log('process_newmeta', newmeta);
if ( newmeta == "L" )
{
if ( current_layer )
map.removeLayer(current_layer);
map.addLayer(localLayer);
current_layer = localLayer;
}
if ( newmeta == "H" )
{
if ( current_layer )
map.removeLayer(current_layer);
map.addLayer(hetznerLayer);
current_layer = hetznerLayer;
}
if ( newmeta == "O" )
{
if ( current_layer )
map.removeLayer(current_layer);
map.addLayer(osmLayer);
current_layer = osmLayer;
}
if ( newmeta == "D" )
{
if ( current_layer )
map.removeLayer(current_layer);
map.addLayer(deLayer);
current_layer = deLayer;
}
if ( newmeta == "6" )
{
if ( current_layer )
map.removeLayer(current_layer);
map.addLayer(os201604Layer);
current_layer = os201604Layer;
}
if ( newmeta == "2" )
{
if ( current_layer )
map.removeLayer(current_layer);
map.addLayer(oslocalLayer);
current_layer = oslocalLayer;
}
if ( newmeta == "U" )
{
if ( current_layer )
map.removeLayer(current_layer);
map.addLayer(humLayer);
current_layer = humLayer;
}
if ( newmeta == "B" )
{
map.addLayer(boundaryLayer);
}
if ( newmeta == "G" )
{
map.addLayer(gps2Layer);
}
if ( newmeta == "F" )
{
map.addLayer(floodedLayer);
}
if ( newmeta == "P" )
{
map.addLayer(LA_ProwLayer);
}
if ( newmeta == "N" )
{
map.addLayer(novisLayer);
}
if ( newmeta == "K" )
{
map.addLayer(osmukcadLayer);
}
}
/* ------------------------------------------------------------------------------
* Any leaflet layer change might require us to change the URL, so each of the
* 3 events comes here.
* ------------------------------------------------------------------------------ */
function any_layer_change( e )
{
console.log("any_layer_change");
console.log(e.layer._url);
current_layer = e.layer;
/* ------------------------------------------------------------------------------
* At this point the "number of layers" found by counting map.eachLayer will be 1
* or 2, even though there is only ever one base layer (if no overlays), and
* that number plus an selected overlayes, if overlays are selected.
*
* Oddly there does not seem to be a way of iterating through the layers added
* to an L.Control.Layers.
* ------------------------------------------------------------------------------ */
var total_matched_layers = "";
map.eachLayer(function(layer){
var current_matched_layer;
current_matched_layer = match_layers( layer._url );
console.log(current_matched_layer);
if ((( total_matched_layers === "L" ) ||
( total_matched_layers === "H" ) ||
( total_matched_layers === "O" ) ||
( total_matched_layers === "D" ) ||
( total_matched_layers === "6" ) ||
( total_matched_layers === "2" ) ||
( total_matched_layers === "U" )) &&
(( current_matched_layer === "L" ) ||
( current_matched_layer === "H" ) ||
( current_matched_layer === "O" ) ||
( current_matched_layer === "D" ) ||
( current_matched_layer === "6" ) ||
( current_matched_layer === "2" ) ||
( current_matched_layer === "U" )))
{
console.log("Base layer already added; ignoring");
}
else
{
total_matched_layers = total_matched_layers + current_matched_layer;
}
});
console.log("total_matched_layers",total_matched_layers);
if ( total_matched_layers )
hash.setHashMeta(total_matched_layers, false);
}
function match_layers( passed_layer_url )
{
var current_matched_layer = "";
/* ------------------------------------------------------------------------------
* The "live" version on map.atownsend.org.uk does not display "local" maps.
* The code supports switching to and from local maps, even if it isn't in
* "basemaps".
* localUrl is defined above identically to hetznerUrl.
* ------------------------------------------------------------------------------ */
if ( passed_layer_url === localUrl )
current_matched_layer = "L";
if ( passed_layer_url === hetznerUrl )
current_matched_layer = "H";
if ( passed_layer_url === osmUrl )
current_matched_layer = "O";
if ( passed_layer_url === deUrl )
current_matched_layer = "D";
if ( passed_layer_url === os201604Url )
current_matched_layer = "6";
if ( passed_layer_url === oslocalUrl )
current_matched_layer = "2";
if ( passed_layer_url === humUrl )
current_matched_layer = "U";
if ( passed_layer_url === boundaryUrl )
current_matched_layer = "B";
if ( passed_layer_url === gps2Url )
current_matched_layer = "G";
if ( passed_layer_url === floodedUrl )
current_matched_layer = "F";
if ( passed_layer_url === LA_ProwUrl )
current_matched_layer = "P";
if ( passed_layer_url === novisUrl )
current_matched_layer = "N";
if ( passed_layer_url === osmukcadUrl )
current_matched_layer = "K";
console.log(current_matched_layer);
return current_matched_layer;
}
function location_success( e )
{
/* ------------------------------------------------------------------------------
* Uncomment to verify when locations are actually returned to the code.
* ------------------------------------------------------------------------------ */
// alert( "location_success" );
}
function location_fail( e )
{
alert( "location_fail " + e.message );
}
function zoom_in()
{
map.zoomIn();
}
/* ------------------------------------------------------------------------------
* These functions are bound to buttons above the map. They're included because
* on a small phone screen a layer of buttons at the top is less intrusive than
* controls over the top of the map itself
* ------------------------------------------------------------------------------ */
function toggle_controls()
{
if ( layersControl_shown )
{
layersControl.removeFrom( map );
zoomControl.removeFrom( map );
scaleControl.removeFrom( map );
layersControl_shown = false;
}
else
{
layersControl.addTo( map );
zoomControl.addTo( map );
scaleControl = L.control.scale().addTo( map );
layersControl_shown = true;
}
}
/* ------------------------------------------------------------------------------
* Another button above the map - this one centres the map on the current
* location at zoom 16. The relatively high timeout is to allow it still to be
* useful on phones that are slow to get a location.
*
* This form of the call replaces "map.locateAndSetView( 16, {timeout: 300000} );"
* in earlier leaflet versions
* ------------------------------------------------------------------------------ */
function pan_centre()
{
map.locate({ setView: true, maxZoom: 16, timeout: 300000 });
}
/* -------------------------------------------------------------------------
* A button to show a map legend. This data needs to be loaded manually.
* See https://github.com/SomeoneElseOSM/SomeoneElse-style-legend
* ------------------------------------------------------------------------- */
function pan_legend()
{
map.panTo([ -25.001, 135.1107 ]);
map.setZoom( 12 );
}
/* -------------------------------------------------------------------------
* A button to display a changelog.
* ------------------------------------------------------------------------- */
function show_changelog()
{
window.open ( 'changelog.html','_self',false )
}
/* -------------------------------------------------------------------------
* A button to display details of mkgmap maps.
* ------------------------------------------------------------------------- */
function show_mkgmap()
{
window.open ( 'mkgmap.html','_self',false )
}
/* -------------------------------------------------------------------------
* A button to display an about screen.
* ------------------------------------------------------------------------- */
function show_about()
{
window.open ( 'about.html','_self',false )
}