track aabb

src/state/states/EditTrackState.ts

@@ -42,18 +42,6 @@ export class EditTrackState extends State<States> {
     const track = getContextItem<TrackSystem>("track");
     const doodler = getContextItem<Doodler>("doodler");
 
-    // For moving a segment, i.e. the currently active one
-    // const segment = track.lastSegment;
-    // if (segment) {
-    //   const firstPoint = segment.points[0].copy();
-    //   const { x, y } = inputManager.getMouseLocation();
-    //   segment.points.forEach((p, i) => {
-    //     const relativePoint = Vector.sub(p, firstPoint);
-    //     p.set(x, y);
-    //     p.add(relativePoint);
-    //   });
-    // }
-
     if (this.selectedSegment) {
       const segment = this.selectedSegment;
       const firstPoint = segment.points[0].copy();

src/track/system.ts

@@ -282,12 +282,54 @@ export class TrackSegment extends PathSegment {
   antiNormalPoints: Vector[] = [];
   evenPoints: [Vector, number][] = [];
 
+  aabb!: AABB;
+
+  private trackGuage = 12;
+
   constructor(p: VectorSet, id?: string) {
     super(p);
     this.doodler = getContextItem<Doodler>("doodler");
     this.id = id ?? crypto.randomUUID();
     this.recalculateRailPoints();
     this.recalculateTiePoints();
+    this.updateAABB();
+  }
+
+  updateAABB() {
+    let minX = Infinity;
+    let maxX = -Infinity;
+    let minY = Infinity;
+    let maxY = -Infinity;
+
+    this.points.forEach((p) => {
+      minX = Math.min(minX, p.x);
+      maxX = Math.max(maxX, p.x);
+      minY = Math.min(minY, p.y);
+      maxY = Math.max(maxY, p.y);
+    });
+
+    const width = maxX - minX;
+    const height = maxY - minY;
+    if (width < this.trackGuage) {
+      const extra = (this.trackGuage - width) / 2;
+      minX -= extra;
+      maxX += extra;
+    }
+    if (height < this.trackGuage) {
+      const extra = (this.trackGuage - height) / 2;
+      minY -= extra;
+      maxY += extra;
+    }
+    this.aabb = {
+      pos: new Vector(minX, minY),
+      x: minX,
+      y: minY,
+      width: maxX - minX,
+      height: maxY - minY,
+      center: new Vector(minX, minY).add(
+        new Vector(maxX - minX, maxY - minY).div(2),
+      ),
+    };
   }
 
   recalculateRailPoints(resolution = 60) {
@@ -296,7 +338,7 @@ export class TrackSegment extends PathSegment {
     for (let i = 0; i <= resolution; i++) {
       const t = i / resolution;
       const normal = this.tangent(t).rotate(Math.PI / 2);
-      normal.setMag(6);
+      normal.setMag(this.trackGuage / 2);
       const p = this.getPointAtT(t);
       this.normalPoints.push(p.copy().add(normal));
       this.antiNormalPoints.push(p.copy().add(normal.rotate(Math.PI)));
@@ -389,6 +431,13 @@ export class TrackSegment extends PathSegment {
     //   color: "red",
     //   weight: 3,
     // });
+
+    this.doodler.drawRect(this.aabb.pos, this.aabb.width, this.aabb.height, {
+      color: "lime",
+    });
+    this.doodler.drawCircle(this.aabb.center, 2, {
+      color: "cyan",
+    });
   }
 
   serialize(): SerializedTrackSegment {

src/train/train.ts

@@ -4,15 +4,6 @@ import { Spline, TrackSegment, TrackSystem } from "../track/system.ts";
 import { Debuggable } from "../lib/debuggable.ts";
 import { lerp, lerpAngle, map } from "../math/lerp.ts";
 
-type TrainAABB = {
-  pos: Vector;
-  x: number;
-  y: number;
-  width: number;
-  height: number;
-  center: Vector;
-};
-
 export class Train extends Debuggable {
   nodes: Vector[] = [];
 
@@ -25,7 +16,7 @@ export class Train extends Debuggable {
 
   speed = 5;
 
-  aabb!: TrainAABB;
+  aabb!: AABB;
 
   get segments() {
     return Array.from(
@@ -204,7 +195,7 @@ export class TrainCar extends Debuggable {
 
   train?: Train;
 
-  aabb!: TrainAABB;
+  aabb!: AABB;
 
   constructor(
     length: number,

src/types.ts

@@ -25,4 +25,25 @@ declare global {
     angles: boolean;
     aabb: boolean;
   };
+
+  type AABB = {
+    pos: Vector;
+    x: number;
+    y: number;
+    width: number;
+    height: number;
+    center: Vector;
+  };
+}
+
+export function applyMixins(derivedCtor: any, baseCtors: any[]) {
+  baseCtors.forEach((baseCtor) => {
+    Object.getOwnPropertyNames(baseCtor.prototype).forEach((name) => {
+      Object.defineProperty(
+        derivedCtor.prototype,
+        name,
+        Object.getOwnPropertyDescriptor(baseCtor.prototype, name) ?? {},
+      );
+    });
+  });
 }