smartgame/js/traits/TKeyboardController.js

import {Trait} from "../Entity.js";

export default class TKeyboardController extends Trait {
	constructor(entity) {
		super(entity, "keyboardController", [ "physics" ]);

		this.speed = 50;
		this.speedAir = 20;

		this.jump = 8;
		this.jumpTimeMax = 0.4;
		this.updrift = 100;
		this.jumpLeeway = 0.4;

		this.map = {
			KeyA: 'left',
			KeyD: 'right',
			Space: "jump",
		};

		this.pressed = {};

		this.jumpTime = 0;
		this.jumping = false;
		this.jumped = false
	}

	onkey(evt) {
		let name = this.map[evt.code];
		if (name == null) return;
		evt.preventDefault();
		this.pressed[name] = evt.type === 'keydown';
	}

	init() {
		window.addEventListener("keydown", e => this.onkey(e));
		window.addEventListener("keyup", e => this.onkey(e));
	}

	update(dt) {
		let phys = this.entity.t.physics;
		let onGround = phys.onGround;

		let speed = phys.onGround ? this.speed : this.speedAir;

		if (this.pressed.left)
			phys.velocity.x -= speed * dt;
		if (this.pressed.right)
			phys.velocity.x += speed * dt;

		let canJump =
			!this.jumped && onGround &&
			this.entity.time -phys.timeLastOnGround < this.jumpLeeway;

		if (this.pressed.jump && canJump) {
			phys.velocity.y = -this.jump;
			this.entity.bounds.pos.y += phys.velocity.y * dt;
			this.jumpTime = this.jumpTimeMax;
			this.jumping = true;
			this.jumped = true;
			onGround = false;
		}

		if (onGround || !this.pressed.jump || this.jumpTime <= 0)
			this.jumping = false;
		if (onGround)
			this.jumped = false;

		if (this.jumping) {
			phys.velocity.y -= this.updrift * this.jumpTime * dt;
			this.jumpTime -= dt;
		}
	}
}