train following

src/state/states/EditTrackState.ts

@@ -404,6 +404,7 @@ export class EditTrackState extends State<States> {
     const inputManager = getContextItem<InputManager>("inputManager");
     inputManager.offKey("e");
     inputManager.offKey("w");
+    inputManager.offKey("z");
     inputManager.offKey("Escape");
     inputManager.offMouse("left");
     if (this.heldEvents.size > 0) {

src/state/states/RunningState.ts

@@ -1,4 +1,4 @@
-import { Doodler } from "@bearmetal/doodler";
+import { Doodler, Point, Vector, ZoomableDoodler } from "@bearmetal/doodler";
 import { getContext, getContextItem } from "../../lib/context.ts";
 import { InputManager } from "../../lib/input.ts";
 import { TrackSystem } from "../../track/system.ts";
@@ -19,8 +19,20 @@ export class RunningState extends State<States> {
 
   layers: number[] = [];
 
+  activeTrain: Train | undefined;
+
   override update(dt: number): void {
     const ctx = getContext() as { trains: Train[]; track: TrackSystem };
+    const doodler = getContextItem<ZoomableDoodler>(
+      "doodler",
+    );
+    if (this.activeTrain) {
+      // (doodler as any).origin = doodler.worldToScreen(
+      //   doodler.width - this.activeTrain.aabb.center.x,
+      //   doodler.height - this.activeTrain.aabb.center.y,
+      // );
+      doodler.centerCameraOn(this.activeTrain.aabb.center);
+    }
     // const ctx = getContext() as { trains: DotFollower[]; track: TrackSystem };
     // TODO
     // Update trains
@@ -67,6 +79,7 @@ export class RunningState extends State<States> {
       new LargeLadyTender(),
     ]);
     ctx.trains.push(train);
+    this.activeTrain = train;
     // const trainCount = 1000;
     // for (let i = 0; i < trainCount; i++) {
     //   const train = new Train(track.path, [new LargeLady(), new Tender()]);