App 2.39.0, server 2.7.0: Grid with map

A new Overview style: the Grid over the roads round the car from
OpenStreetMap, drawn in the floor's perspective, heading up, the bigger
roads glowing brighter, the car as a chevron.

Server: POST /v1/map/roads {z:14,x,y} fetches a tile's drivable roads
from Overpass (OVERPASS_URL; one request at a time, at least a second
apart), simplifies them to tile-local points in four classes, caches
them for 30 days and never logs the tile.

App: MapRoads keeps the 3x3 tiles round the car from its own cache or
the server; GPS only while the style is shown; bearing from the GPS or
from successive positions. Without GPS, server or roads the plain floor
says why. OSM attribution on screen and in LICENSE.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LhzAVaUyqcw5PkGjz4mWW6

app/src/test/java/com/evsuite/abrp/MapGeometryTest.java

@@ -0,0 +1,65 @@
+package com.evsuite.abrp;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+/** The Grid map's tile arithmetic and the server's road tiles — pure JVM. */
+public class MapGeometryTest {
+
+    @Test
+    public void tilesMatchTheServer() {
+        // Alexanderplatz, Berlin: the tile the server tests use too.
+        assertEquals(8802, MapGeometry.tileX(13.4125));
+        assertEquals(5373, MapGeometry.tileY(52.5219));
+        long key = MapGeometry.key(8802, 5373);
+        assertEquals(8802, MapGeometry.keyX(key));
+        assertEquals(5373, MapGeometry.keyY(key));
+    }
+
+    @Test
+    public void metresPerUnitShrinkTowardsThePoles() {
+        // A zoom-14 tile is about 2.4 km across at the equator, in 4096 units.
+        assertEquals(0.597, MapGeometry.metresPerUnit(0), 0.001);
+        assertEquals(0.363, MapGeometry.metresPerUnit(52.52), 0.001);
+    }
+
+    @Test
+    public void unusablePositions() {
+        assertFalse(MapGeometry.usable(Double.NaN, 13));
+        assertFalse(MapGeometry.usable(0, 0)); // a GPS that has nothing yet
+        assertFalse(MapGeometry.usable(89, 13));
+        assertTrue(MapGeometry.usable(52.52, 13.41));
+    }
+
+    @Test
+    public void roadTilesParse() {
+        RoadTile t = RoadTile.parse("{\"z\":14,\"x\":8802,\"y\":5373,\"extent\":4096,\"ways\":["
+                + "{\"c\":1,\"p\":[-115,1236,82,1080,100,1000]},{\"c\":3,\"p\":[0,0,10,10]}]}", 8802, 5373);
+        assertNotNull(t);
+        assertEquals(2, t.classes.length);
+        assertEquals(1, t.classes[0]);
+        assertEquals(6, t.points[0].length);
+        assertEquals(-115, t.bounds[0][0]);
+        assertEquals(1000, t.bounds[0][1]);
+        assertEquals(100, t.bounds[0][2]);
+        assertEquals(1236, t.bounds[0][3]);
+    }
+
+    @Test
+    public void badRoadTilesAreNoTile() {
+        String head = "{\"z\":14,\"x\":1,\"y\":2,\"extent\":4096,\"ways\":";
+        assertNotNull(RoadTile.parse(head + "[]}", 1, 2));
+        assertNull("another tile", RoadTile.parse(head + "[]}", 1, 3));
+        assertNull("another zoom", RoadTile.parse("{\"z\":13,\"x\":1,\"y\":2,\"extent\":4096,\"ways\":[]}", 1, 2));
+        assertNull("unknown class", RoadTile.parse(head + "[{\"c\":7,\"p\":[0,0,1,1]}]}", 1, 2));
+        assertNull("one point", RoadTile.parse(head + "[{\"c\":1,\"p\":[0,0]}]}", 1, 2));
+        assertNull("odd count", RoadTile.parse(head + "[{\"c\":1,\"p\":[0,0,1]}]}", 1, 2));
+        assertNull("far outside", RoadTile.parse(head + "[{\"c\":1,\"p\":[0,0,99999,1]}]}", 1, 2));
+        assertNull("not JSON", RoadTile.parse("<html>", 1, 2));
+    }
+}

app/src/test/java/com/evsuite/abrp/OverviewStyleTest.java

@@ -63,5 +63,8 @@ public class OverviewStyleTest {
         assertEquals(R.style.ThemeOverlay_EV_Style_Retro,
                 StylePalette.appOverlay(OverviewStyle.RETRO, true, AccentColor.HOLBORN_BLUE));
         assertEquals("original_colours_RETRO", OverviewStyle.RETRO.originalKey());
+        // Grid with map shares the Grid's choice.
+        assertEquals(OverviewStyle.GRID.originalKey(), OverviewStyle.GRID_MAP.originalKey());
+        assertEquals(StylePalette.overlay(OverviewStyle.GRID), StylePalette.overlay(OverviewStyle.GRID_MAP));
     }
 }