add island names [#294] (#424)

* add island names [#294]
* add island names example
* island names test
* Tune text max width

---------

Co-authored-by: Oliver Wipfli <[email protected]>

Author: bdon

app/src/examples.json

@@ -82,5 +82,12 @@
     "tags": ["landuse"],
     "center": [-118.0726, 34.8328],
     "zoom": 10
+  },
+  {
+    "name": "island-names",
+    "description": "label the names of prominent islands at zoom 7",
+    "tags": ["earth"],
+    "center": [-123.22, 48.111],
+    "zoom": 7
   }
 ]

styles/src/base_layers.ts

@@ -1477,6 +1477,29 @@ export function labels_layers(
         "text-halo-color": t.water,
       },
     },
+    {
+      id: "earth_label_islands",
+      type: "symbol",
+      source: source,
+      "source-layer": "earth",
+      filter: ["in", "kind", "island"],
+      layout: {
+        "text-font": [t.italic || "Noto Sans Italic"],
+        "text-field": get_multiline_name(
+          lang,
+          script,
+          t.regular,
+        ) as DataDrivenPropertyValueSpecification<string>,
+        "text-size": 10,
+        "text-letter-spacing": 0.1,
+        "text-max-width": 8,
+      },
+      paint: {
+        "text-color": t.subplace_label,
+        "text-halo-color": t.subplace_label_halo,
+        "text-halo-width": 1,
+      },
+    },
     {
       id: "water_label_lakes",
       type: "symbol",

tiles/src/main/java/com/protomaps/basemap/layers/Earth.java

@@ -64,6 +64,15 @@ public void processOsm(SourceFeature sf, FeatureCollector features) {
 
       OsmNames.setOsmNames(feat, sf, 0);
     }
+
+    if (sf.canBePolygon() && sf.hasTag("place", "island")) {
+      var feat = features.innermostPoint(LAYER_NAME)
+        .setId(FeatureId.create(sf))
+        .setAttr("kind", "island")
+        .setMinPixelSize(20)
+        .setMinZoom(6);
+      OsmNames.setOsmNames(feat, sf, 0);
+    }
   }
 
   @Override

tiles/src/test/java/com/protomaps/basemap/layers/EarthTest.java

@@ -37,6 +37,19 @@ void cliff() {
       )));
   }
 
+  @Test
+  void island() {
+    assertFeatures(6,
+      List.of(Map.of("kind", "island", "_minzoom", 6)),
+      process(SimpleFeature.create(
+        newPolygon(0, 0, 0, 1, 1, 1, 0, 0),
+        new HashMap<>(Map.of("place", "island")),
+        "osm",
+        null,
+        0
+      )));
+  }
+
   @Test
   void testNe() {
     assertFeatures(15,