the-world-engine/dist/esm/engine/script/controller/TrackCameraController.js

three.js based, unity like game engine for browser

import { MathUtils, Vector2, Vector3 } from "three/src/Three";

import { Component } from "../../hierarchy_object/Component";

import { Camera } from "../render/Camera";

export class TrackCameraController extends Component {
    disallowMultipleComponent=true;
    requiredComponents=[ Camera ];
    Ur=null;
    Lr=new Vector2;
    Jr=20;
    Kr=1;
    Nr=false;
    Qr=false;
    Wr=6;
    start() {
        if (this.Ur) {
            const t = this.Xr.copy(this.Ur.transform.position);
            t.z += this.Jr;
            this.transform.position.copy(t);
        }
    }
    Xr=new Vector3;
    update() {
        const t = this.Xr.copy(this.Ur.transform.position);
        t.z += this.Jr;
        t.x += this.Lr.x;
        t.y += this.Lr.y;
        const e = this.transform;
        if (this.Qr) {
            const s = this.engine.time.deltaTime;
            const r = this.Wr;
            const i = MathUtils.damp(e.position.x, t.x, r, s);
            const a = MathUtils.damp(e.position.y, t.y, r, s);
            const h = MathUtils.damp(e.position.z, t.z, r, s);
            e.position.set(i, a, h);
        } else {
            e.position.copy(t);
        }
        if (this.Nr) {
            e.localPosition.x = Math.round(e.localPosition.x / this.Kr) * this.Kr;
            e.localPosition.y = Math.round(e.localPosition.y / this.Kr) * this.Kr;
        }
    }
    setTrackTarget(t) {
        this.Ur = t;
    }
    get targetOffset() {
        return this.Lr;
    }
    set targetOffset(t) {
        this.Lr.copy(t);
    }
    get cameraDistanceOffset() {
        return this.Jr;
    }
    set cameraDistanceOffset(t) {
        this.Jr = t;
    }
    get pixelPerfectUnit() {
        return this.Kr;
    }
    set pixelPerfectUnit(t) {
        this.Kr = t;
    }
    get pixelPerfect() {
        return this.Nr;
    }
    set pixelPerfect(t) {
        this.Nr = t;
    }
    get smoothTrack() {
        return this.Qr;
    }
    set smoothTrack(t) {
        this.Qr = t;
    }
    get smoothLambda() {
        return this.Wr;
    }
    set smoothLambda(t) {
        this.Wr = t;
    }
}