aviator2-shooting.js

class SimpleGun {
  downtime() {
    return 0.1
  }

  damage() {
    return 1
  }

  shoot(direction) {
    const BULLET_SPEED = 0.5
    const RECOIL_DISTANCE = 4
    const RECOIL_DURATION = this.downtime() / 1.5

    const position = new THREE.Vector3()
    this.mesh.getWorldPosition(position)
    position.add(new THREE.Vector3(5, 0, 0))
    spawnProjectile(this.damage(), position, direction, BULLET_SPEED, 0.3, 3)

    // Little explosion at exhaust
    spawnParticles(position.clone().add(new THREE.Vector3(2,0,0)), 1, Colors.orange, 0.2)

    // Recoil of gun
    const initialX = this.mesh.position.x
    TweenMax.to(this.mesh.position, {
      duration: RECOIL_DURATION,
      x: initialX - RECOIL_DISTANCE,
      onComplete: () => {
        TweenMax.to(this.mesh.position, {
          duration: RECOIL_DURATION,
          x: initialX,
        })
      },
    })
  }
}

class Airplane {
  shoot() {
    if (!this.weapon) {
      return
    }

    // rate-limit shooting
    const nowTime = new Date().getTime() / 1000
    if (nowTime-this.lastShot < this.weapon.downtime()) {
      return
    }
    this.lastShot = nowTime

    // fire the shot
    let direction = new THREE.Vector3(10, 0, 0)
    direction.applyEuler(airplane.mesh.rotation)
    this.weapon.shoot(direction)

    // recoil airplane
    const recoilForce = this.weapon.damage()
    TweenMax.to(this.mesh.position, {
      duration: 0.05,
      x: this.mesh.position.x - recoilForce,
    })
  }
}

// in the main loop
if (mouseDown[0] || keysDown['Space']) {
  airplane.shoot()
}