www/js/controls.js

/** Keyboard driving input (WASD / arrows). */

export class DriveControls {
  constructor(target = window) {
    this.keys = new Set();
    this._down = (e) => this.keys.add(e.code);
    this._up = (e) => this.keys.delete(e.code);
    target.addEventListener('keydown', this._down);
    target.addEventListener('keyup', this._up);
  }

  dispose(target = window) {
    target.removeEventListener('keydown', this._down);
    target.removeEventListener('keyup', this._up);
  }

  sample() {
    const forward = this.keys.has('KeyW') || this.keys.has('ArrowUp');
    const back = this.keys.has('KeyS') || this.keys.has('ArrowDown');
    const left = this.keys.has('KeyA') || this.keys.has('ArrowLeft');
    const right = this.keys.has('KeyD') || this.keys.has('ArrowRight');
    return {
      throttle: (forward ? 1 : 0) - (back ? 1 : 0),
      steer: (left ? 1 : 0) - (right ? 1 : 0),
      brake: this.keys.has('Space') ? 1 : 0,
    };
  }
}