BloodAndGore/Assets/Scripts/Player.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace Saltosion.OneWeapon {
    public class Player : MonoBehaviour {

        public Rigidbody2D Body;
        public Transform Hand;
        public float MoveSpeed = 50f;

        private Gun Gun;

        private Vector2 GunLocation = new Vector2(0.1f, -0.7f);
        private Vector3 GunRotation = new Vector3(0, 0, -90);

        void Start() {

        }

        void Update() {
            float X = Input.GetAxis("Horizontal");
            float Y = Input.GetAxis("Vertical");

            Vector2 Direction = new Vector2(X, Y).normalized;

            Body.velocity = Direction * MoveSpeed;

            Vector3 MousePos = Input.mousePosition;
            Vector3 PointedPos = Camera.main.ScreenToWorldPoint(MousePos);

            Vector2 LookDirection = (PointedPos - Hand.position).normalized;

            var Rot = Hand.localEulerAngles;
            Rot.z = Mathf.Atan2(LookDirection.y, LookDirection.x) * Mathf.Rad2Deg + 90;
            Hand.localEulerAngles = Rot;

            bool Shoot = Input.GetButtonDown("Shoot");
            if (Shoot && Gun != null) {
                Gun.Shoot(Gun.transform.position, LookDirection, Rot.z);
            }
        }

        public void SetGun(Gun gun) {
            if (Gun != null) {
                Destroy(Gun.gameObject);
            }
            Gun = gun;
            Gun.transform.parent = Hand;
            Gun.transform.localPosition = GunLocation;
            Gun.transform.localEulerAngles = GunRotation;
        }
    }
}