BloodAndGore/Assets/Scripts/Utils/AcceleratedMovement.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Saltosion.OneWeapon.Effects;

namespace Saltosion.OneWeapon.Utils {
    [RequireComponent(typeof(Rigidbody2D))]
    public class AcceleratedMovement : MonoBehaviour {

        public Bobbing Bobbing;

        private Vector2 LastDirection = Vector2.zero;
        public Vector2 Direction = Vector2.zero;
        public float MaxSpeed = 7;
        public float AccelerationSpeed = 70;
        public float DecelerationSpeed = 70;

        public Vector2 CurrentVelocity { private set; get; }
        public float SpeedPercentage { private set; get; }
        private float CurrentSpeed = 0;

        private Rigidbody2D Body;

        void Start() {
            Body = GetComponent<Rigidbody2D>();
        }

        void Update() {
            if (Direction.magnitude > 0) {
                CurrentSpeed += AccelerationSpeed * Time.deltaTime;
            } else {
                CurrentSpeed -= DecelerationSpeed * Time.deltaTime;
            }
            CurrentSpeed *= 1 - (Vector2.Angle(Direction, LastDirection) / 180);
            CurrentSpeed = Mathf.Clamp(CurrentSpeed, 0, MaxSpeed);
            SpeedPercentage = CurrentSpeed / MaxSpeed;

            CurrentVelocity = Direction.normalized * CurrentSpeed;

            LastDirection = Direction;
            Body.velocity = CurrentVelocity;
            if (Bobbing != null) {
                Bobbing.BobbingMultiplier = SpeedPercentage;
            }
        }
    }
}