Add basic support for city outlines

Use with load_geojson(
	"Cities (outline, demo)",
	"./geojson/cities_demo.json",
	"outline",
	"black",
	1,
	style_outlines);

htdocs/leafletjs/Leaflet.streetlabels.js

@@ -80,10 +80,8 @@ L.StreetLabels = L.LabelTextCollision
                 ctx.lineWidth = this.options.fontStyle.lineWidth;
 
                 var fontSize = this.options.fontStyle.fontSize;
-
                 if (this._map && this.options.fontStyle.dynamicFontSize === true) {
-                    fontSize = this._getDynamicFontSize();
+                    fontSize = this._getDynamicFontSize(layer.feature);
-
                 }
 
                 ctx.font = fontSize + this.options.fontStyle.fontSizeUnit + " 'Helvetica Neue',Helvetica,Arial,sans-serif";
@@ -98,7 +96,6 @@ L.StreetLabels = L.LabelTextCollision
                         textWidth, textHeight));
 
                 if (this.options.collisionFlg) {
-
                     for (var index in this._textList) {
                         var pointBounds = this._textList[index];
                         if (pointBounds.intersects(bounds)) {
@@ -184,7 +181,7 @@ L.StreetLabels = L.LabelTextCollision
             return polyline;
         },
 
-        _getDynamicFontSize: function () {
+        _getDynamicFontSize: function (layer) {
             return parseInt(this._map.getZoom());
         },
 

htdocs/mapscript.js

@@ -1,13 +1,27 @@
 var editor_mode = 0;
 var mymap;
+
+var polyconf_show_street_names = 5; // Zoom level for when to start showing street names
+var polyconf_show_cities = 5; /* City outlines will be filled on this level and further away */
+var polyconf_show_districts = 4; /* Shown from polyconf_show_cities until this*/
+
 var streetLabelsRenderer = new L.StreetLabels({
 	collisionFlg: true,
 	propertyName: 'name',
 	showLabelIf: function (layer) {
-		if (!(layer.geometry.type == "LineString"|| layer.geometry.type == "Polygon"))
+		switch (layer.geometry.type) {
-			return false;
+		case "LineString":
-		if (mymap.getZoom() <= 5)
+			if (mymap.getZoom() <= polyconf_show_street_names)
+				return false;
+			break;
+		case "Polygon":
+			if (mymap.getZoom() > polyconf_show_street_names)
+				return false;
+			break;
+		default:
 			return false;
+		}
+		
 		return true;
 	},
 	fontStyle: {
@@ -20,14 +34,34 @@ var streetLabelsRenderer = new L.StreetLabels({
 	},
 });
 
-streetLabelsRenderer._getDynamicFontSize = function () {
+streetLabelsRenderer._getDynamicFontSize = function (layer) {
 	zoom = mymap.getZoom();
-	if (zoom <= 8)
+
-		return 11;
+	switch (layer.geometry.type) {
-	else
+	case "LineString":
-		return 2**(zoom - 9) * 11;
+		if (zoom <= 8)
+			return 11;
+		else
+			return 2**(zoom - 9) * 11;
+		break;
+	case "Polygon":
+		if (zoom >= 4)
+			return 30;
+		return 20;
+	default:
+		break;
+	}
+	return 10;
 }
 
+var style_outlines = {
+		radius: 8,
+		fillColor: "#ff7800",
+		color: "black",
+		opacity: 1,
+		fillOpacity: 0.5
+	};
+
 
 // Projection fix from: https://gis.stackexchange.com/questions/200865/leaflet-crs-simple-custom-scale
 var factorx = 1 / 256 * 4;
@@ -62,7 +96,7 @@ mymap = L.map('mapid', {
 	renderer: streetLabelsRenderer,
 	editable: true,
 	crs: L.CRS.pr
-}).setView([0, 0], 6);
+}).setView([0, 0], 5);
 
 var mapheight = 16384;
 var mapwidth = mapheight;
@@ -115,15 +149,34 @@ function load_tiles(name, id) {
 	return satellite;
 }
 
+var current_location = "";
+var current_feature = null;
+
 function load_geojson(name, url, iconname, iconcolor, active=1, style={}) {
 	var xhttp_ps = new XMLHttpRequest();
 	xhttp_ps.onreadystatechange = function() {
 		if (this.readyState == 4) {
 			if (this.status == 200) {
+				onEachFeature = null;
+				pointToLayer = null;
+				filter = null;
+				
 				switch (iconname) {
 				case "street":
-					onEachFeature = null;
+					onEachFeature = function(feature, layer) {
-					pointToLayer = null;
+						layer.on("click", function (e) {
+							current_feature = feature;
+						});
+					};
+					break;
+				case "outline":
+					onEachFeature = function(feature, layer) {
+						layer.myTag = iconname;
+						layer.myName = name;
+						layer.on("click", function (e) {
+							current_location = feature.properties.name;
+						});
+					}
 					break;
 				default: /* else it is a marker with the specified icon */
 					onEachFeature = function(feature, layer) {
@@ -151,12 +204,14 @@ function load_geojson(name, url, iconname, iconcolor, active=1, style={}) {
 					break;
 				}
 				var json = JSON.parse(xhttp_ps.responseText);
-				var geojson = L.geoJSON(json, {
+				geojson = L.geoJSON(json, {
 					style: style,
 					onEachFeature: onEachFeature,
-					pointToLayer: pointToLayer
+					pointToLayer: pointToLayer,
+					filter: filter
 				});
 				layers.addOverlay(geojson, name);
+				
 				if (active)
 					geojson.addTo(mymap);
 				return geojson;
@@ -351,7 +406,16 @@ var baseballIcon = L.AwesomeMarkers.icon({
 });
 
 function onMapClick(e) {
-	popup.setLatLng(e.latlng).setContent("You clicked the map at " + e.latlng.toString()).openOn(mymap);
+	var addinfo = "";
+	if (current_location != "")
+		addinfo = " (part of " + current_location + ")";
+	if (current_feature) {
+		popup.setLatLng(e.latlng).setContent("This is " + current_feature.properties.name + addinfo).openOn(mymap);
+	} else {
+		popup.setLatLng(e.latlng).setContent("You clicked the map at " + e.latlng.toString() + addinfo).openOn(mymap);
+	}
+	current_feature = null;
+	current_location = "";
 }
 
 mymap.on('click', onMapClick);
@@ -394,13 +458,31 @@ function update_street_width() {
 	}
 }
 
+function update_outline_visibility() {
+	zoom = mymap.getZoom();
+	mymap.eachLayer( function(layer) {
+		if ( layer.myTag && layer.myTag === "outline") {
+			var opacity;
+			if (zoom <= polyconf_show_cities)
+				opacity = 0.5;
+			//else if (zoom == polyconf_show_cities + 1)
+			//	opacity = 0.2;
+			else
+				opacity = 0.0;
+				
+			layer.setStyle({fillOpacity: opacity});
+		}
+	});
+}
+
 mymap.on('zoomend', function () {is_user_drag = 1; update_hash_from_position();});
 mymap.on('zoomend', update_aa_status);
 mymap.on('zoomend', update_street_width);
+mymap.on('zoomend', update_outline_visibility);
 mymap.on('moveend', update_hash_from_position);
 mymap.on('dragstart', function () { is_user_drag = 1;});
 mymap.on('keydown', function (e) { if (e.originalEvent.code.match(/Arrow.*/)) is_user_drag = 1;});
-
+mymap.on('overlayadd', function (e) { update_street_width(); update_outline_visibility(); });
 function onHashChange(e, hash=null) {
 	if (!hash)
 		hash = document.location.hash;
@@ -417,4 +499,3 @@ function onHashChange(e, hash=null) {
 
 window.addEventListener("hashchange", onHashChange, false);
 onHashChange(null);
-update_street_width();