playcanvas/build/playcanvas/src/extras/input/controllers/focus-controller.js

Open-source WebGL/WebGPU 3D engine for the web

import { Quat } from "../../../core/math/quat.js";
import { Vec3 } from "../../../core/math/vec3.js";
import { InputController } from "../input.js";
import { damp } from "../math.js";
import { Pose } from "../pose.js";
const EPSILON = 1e-3;
const dir = new Vec3();
const position = new Vec3();
const rotation = new Quat();
class FocusController extends InputController {
	_targetRootPose = new Pose();
	_rootPose = new Pose();
	_targetChildPose = new Pose();
	_childPose = new Pose();
	focusDamping = 0.98;
	attach(pose, smooth = true) {
		this._targetRootPose.set(pose.getFocus(dir), pose.angles, 0);
		this._targetChildPose.position.set(0, 0, pose.distance);
		if (!smooth) {
			this._rootPose.copy(this._targetRootPose);
			this._childPose.copy(this._targetChildPose);
		}
	}
	detach() {
		this._targetRootPose.copy(this._rootPose);
		this._targetChildPose.copy(this._childPose);
	}
	complete() {
		return this._targetRootPose.equalsApprox(this._rootPose, EPSILON) && this._targetChildPose.equalsApprox(this._childPose, EPSILON);
	}
	update(frame, dt) {
		frame.read();
		this._rootPose.lerp(
			this._rootPose,
			this._targetRootPose,
			damp(this.focusDamping, dt),
			damp(this.focusDamping, dt),
			1
		);
		this._childPose.lerp(
			this._childPose,
			this._targetChildPose,
			damp(this.focusDamping, dt),
			1,
			1
		);
		rotation.setFromEulerAngles(this._rootPose.angles).transformVector(this._childPose.position, position).add(this._rootPose.position);
		return this._pose.set(position, this._rootPose.angles, this._childPose.position.length());
	}
	destroy() {
		this.detach();
	}
}
export {
	FocusController
};