Refactor

backend/src/physics/bounding-boxes/bounding-box-base.ts

@@ -1,6 +1,7 @@
 import { vec2 } from 'gl-matrix';
 
-export class BoundingBoxBase {
+// axes aligned
+export abstract class BoundingBoxBase {
   constructor(
     protected _xMin: number = 0,
     protected _xMax: number = 0,

backend/src/physics/containers/bounding-box-tree.ts

@@ -1,7 +1,7 @@
 import { BoundingBoxBase } from '../bounding-boxes/bounding-box-base';
 import { StaticPhysical } from '../physicals/static-physical';
-// source: https://github.com/ubilabs/kd-tree-javascript/blob/master/kdTree.js
 
+// source: https://github.com/ubilabs/kd-tree-javascript/blob/master/kdTree.js
 class Node {
   public left: Node | null = null;
   public right: Node | null = null;

backend/src/physics/functions/get-bounding-box-of-circle.ts

@@ -1,8 +1,9 @@
 import { Circle } from 'shared';
 import { BoundingBoxBase } from '../bounding-boxes/bounding-box-base';
+import { ImmutableBoundingBox } from '../bounding-boxes/immutable-bounding-box';
 
 export const getBoundingBoxOfCircle = (circle: Circle): BoundingBoxBase =>
-  new BoundingBoxBase(
+  new ImmutableBoundingBox(
     circle.center.x - circle.radius,
     circle.center.x + circle.radius,
     circle.center.y - circle.radius,

backend/src/physics/functions/move-circle.ts

@@ -1,7 +1,7 @@
 import { vec2 } from 'gl-matrix';
 import { Circle, GameObject, rotate90Deg } from 'shared';
 import { CirclePhysical } from '../../objects/circle-physical';
-import { reactsToCollision } from '../physicals/reacts-to-collision';
+import { reactsToCollision } from './reacts-to-collision';
 import { evaluateSdf } from './evaluate-sdf';
 import { Physical } from '../physicals/physical';
 

backend/src/physics/functions/reacts-to-collision.ts

@@ -0,0 +1,8 @@
+import { GameObject } from 'shared';
+
+export interface ReactsToCollision {
+  onCollision(other: GameObject): void;
+}
+
+export const reactsToCollision = (a: any): a is ReactsToCollision =>
+  a && 'onCollision' in a;