the-world-engine/dist/esm/engine/physics/2d/PhysicsObject2D.js

three.js based, unity like game engine for browser

import { BodyType } from "../../../box2d.ts/build/index";

import { FixtureGroup } from "./FixtureGroup";

import { PhysicsMaterial2D } from "./PhysicsMaterial2D";

export class PhysicsObject2D {
    gameObject;
    body;
    At;
    Ki=null;
    Qi=null;
    Ui=[];
    constructor(i, t, s) {
        this.gameObject = i;
        this.body = t;
        this.At = s;
        t.SetUserData(this);
    }
    addRigidBody(i) {
        if (this.Qi) throw new Error("RigidBody already exists");
        this.Qi = i;
        return this;
    }
    removeRigidBody() {
        this.Qi = null;
        this.body.SetType(BodyType.b2_kinematicBody);
        this.body.SetBullet(false);
        this.body.SetEnabled(true);
        this.Wi();
    }
    addCollider(i) {
        this.Ui.push(i);
        return new FixtureGroup(this.body, this);
    }
    removeCollider(i, t) {
        const s = this.Ui.indexOf(i);
        if (s === -1) throw new Error("Collider not found");
        this.Ui.splice(s, 1);
        t.clear();
        this.Wi();
    }
    Wi() {
        if (this.Ui.length === 0 && this.Qi === null) {
            this.body.GetWorld().DestroyBody(this.body);
            this.At();
        }
    }
    setSharedPhysicsMaterial(i) {
        if (i) {
            if (!this.Ki) {
                this.Ki = new PhysicsMaterial2D(i.friction, i.bounciness);
                this.Ki.onChanged.addListener(this.Xi);
            } else {
                this.Ki.copy(i);
            }
        } else {
            this.Ki?.onChanged.removeListener(this.Xi);
            this.Ki = null;
        }
        this.Xi();
    }
    Xi=() => {
        const i = this.Ui;
        for (let t = 0; t < i.length; ++t) {
            i[t].updateFixturesMaterialInfo();
        }
    };
    get sharedMaterial() {
        return this.Ki;
    }
    get rigidbody() {
        return this.Qi;
    }
    get colliders() {
        return this.Ui;
    }
}