Remove unused HoverTargetResolver and TerritoryBorderWebGL files; update imports in PlayerInfoOverlay, TerritoryLayer, and other files to use new HoverTarget module.

src/client/graphics/HoverTarget.ts

@@ -0,0 +1,63 @@
+import { UnitType } from "../../core/game/Game";
+import { TileRef } from "../../core/game/GameMap";
+import { GameView, PlayerView, UnitView } from "../../core/game/GameView";
+
+export interface HoverTargetResolution {
+  player: PlayerView | null;
+  unit: UnitView | null;
+}
+
+const HOVER_UNIT_TYPES: UnitType[] = [
+  UnitType.Warship,
+  UnitType.TradeShip,
+  UnitType.TransportShip,
+];
+
+const HOVER_DISTANCE_PX = 5;
+
+function distSquared(
+  game: GameView,
+  tile: TileRef,
+  coord: { x: number; y: number },
+): number {
+  const dx = game.x(tile) - coord.x;
+  const dy = game.y(tile) - coord.y;
+  return dx * dx + dy * dy;
+}
+
+export function resolveHoverTarget(
+  game: GameView,
+  worldCoord: { x: number; y: number },
+): HoverTargetResolution {
+  if (!game.isValidCoord(worldCoord.x, worldCoord.y)) {
+    return { player: null, unit: null };
+  }
+  const tile = game.ref(worldCoord.x, worldCoord.y);
+  const owner = game.owner(tile);
+  if ((owner as any).isPlayer?.()) {
+    return { player: owner as PlayerView, unit: null };
+  }
+
+  if (game.isLand(tile)) {
+    return { player: null, unit: null };
+  }
+
+  const units = game
+    .units(...HOVER_UNIT_TYPES)
+    .filter(
+      (u) =>
+        distSquared(game, u.tile(), worldCoord) <
+        HOVER_DISTANCE_PX * HOVER_DISTANCE_PX,
+    )
+    .sort(
+      (a, b) =>
+        distSquared(game, a.tile(), worldCoord) -
+        distSquared(game, b.tile(), worldCoord),
+    );
+
+  if (units.length > 0) {
+    return { player: units[0].owner(), unit: units[0] };
+  }
+
+  return { player: null, unit: null };
+}