import {Control} from "./Control";
import type {IControlParams} from "./Control";
import {Clock} from "../Clock";
import {getSunPosition} from "../astro/earth";
import {LightSource} from "../light/LightSource";
import {Quat} from "../math/Quat";
import {Vec3} from "../math/Vec3";
interface ISunParams extends IControlParams {
activationHeight?: number;
offsetVertical?: number;
offsetHorizontal?: number;
stopped?: boolean;
}
/**
* Real Sun geocentric position control that place the Sun on the right place by the Earth.
*/
export class Sun extends Control {
public activationHeight: number;
public offsetVertical: number;
public offsetHorizontal: number;
public sunlight: LightSource;
protected _currDate: number;
protected _prevDate: number;
protected _clockPtr: Clock | null;
protected _lightOn: boolean;
protected _stopped: boolean;
protected _f: number;
protected _k: number;
constructor(options: ISunParams = {}) {
super({autoActivate: true, ...options});
this._name = "sun";
this.activationHeight = options.activationHeight || 12079000.0;
this.offsetVertical = options.offsetVertical || -5000000;
this.offsetHorizontal = options.offsetHorizontal || 5000000;
this.sunlight = new LightSource({
ambient: new Vec3(0.15, 0.15, 0.25),
diffuse: new Vec3(0.9, 0.9, 0.8),
specular: new Vec3(0.1, 0.1, 0.06),
shininess: 110
});
/**
* Current frame handler clock date and time.
* @private
* @type {Number}
*/
this._currDate = 0;
/**
* Previous frame handler clock date and time.
* @private
* @type {Number}
*/
this._prevDate = 0;
this._clockPtr = null;
this._lightOn = false;
this._f = 0;
this._k = 0;
this._stopped = options.stopped || false;
}
public override oninit() {
this.planet!.lightEnabled = true;
// sunlight initialization
this.sunlight.addTo(this.planet!);
this.renderer!.events.on("draw", this._draw, this);
if (!this._clockPtr) {
this._clockPtr = this.renderer!.handler.defaultClock;
}
}
public stop() {
this._stopped = true;
this.deactivate();
}
public start() {
this._stopped = false;
this.activate();
}
public override onactivate() {
super.onactivate();
this._stopped = false;
}
public bindClock(clock: Clock) {
this._clockPtr = clock;
}
protected _draw() {
if (!this._clockPtr) return;
this._currDate = this._clockPtr.currentDate;
if (!this._stopped) {
let cam = this.planet!.camera;
if (cam.getHeight() < this.activationHeight || !this._active) {
this._lightOn = true;
this._f = 1;
let n = cam.eye.normal(),
u = cam.getForward();
u.scale(Math.sign(cam.getUp().dot(n))); // up
if (cam.slope > 0.99) {
u = cam.getUp();
}
let tu = Vec3.proj_b_to_plane(u, n, u).normalize().scale(this.offsetVertical);
let tr = Vec3.proj_b_to_plane(cam.getRight(), n, cam.getRight())
.normalize()
.scale(this.offsetHorizontal); // right
let d = tu.add(tr);
let pos = cam.eye.add(d);
if (this._k > 0) {
this._k -= 0.001;
let rot = Quat.getRotationBetweenVectors(
this.sunlight._position.normal(),
pos.normal()
);
let r = rot.slerp(Quat.IDENTITY, this._k).normalize();
this.sunlight.setPosition3v(r.mulVec3(this.sunlight._position));
} else {
this.sunlight.setPosition3v(pos);
}
} else {
this._k = 1;
if (this._f > 0) {
this._f -= 0.001;
let rot = Quat.getRotationBetweenVectors(
this.sunlight._position.normal(),
getSunPosition(this._currDate).normal()
);
let r = rot.slerp(Quat.IDENTITY, this._f).normalize();
this.sunlight.setPosition3v(r.mulVec3(this.sunlight._position));
} else {
if (
(Math.abs(this._currDate - this._prevDate) > 0.00034 && this._active) ||
this._lightOn
) {
this._lightOn = false;
this._prevDate = this._currDate;
this.sunlight.setPosition3v(getSunPosition(this._currDate));
this._f = 0;
}
}
}
} else {
this.sunlight.setPosition3v(getSunPosition(this._currDate));
}
}
}