Action/Samples/PlatformerJump.cs

using Syntriax.Modules.State;
using UnityEngine;

namespace Syntriax.Modules.Action.Samples
{
    [RequireComponent(typeof(Rigidbody2D))]
    public class PlatformerJump : ActionWithDeactivation
    {
        [SerializeField] private float jumpSpeed = 10f;
        public float JumpSpeed { get => jumpSpeed; set => jumpSpeed = value; }
        [SerializeField] private float fallThreshold = 0f;
        public float FallThreshold { get => fallThreshold; set => fallThreshold = value; }

        [SerializeField] private float fallMultiplier = 1.5f;
        public float FallMultiplier
        {
            get => fallMultiplier;
            set => fallMultiplier = value * Time.fixedDeltaTime;
        }

        [SerializeField] private float suspensionMultiplier = 1f;
        public float SuspensionMultiplier
        {
            get => suspensionMultiplier;
            set => suspensionMultiplier = value * Time.fixedDeltaTime;
        }

        protected IStateEnable gameObjectStateEnable = null;
        protected bool airSuspension = false;
        protected Rigidbody2D rigid = null;

        protected virtual void Start()
        {
            rigid = GetComponent<Rigidbody2D>();
            gameObjectStateEnable = GetComponent<IStateEnable>();

            FallMultiplier = fallMultiplier;
            SuspensionMultiplier = suspensionMultiplier;

            OnActivated += _ => OnActionDeactivated();
            OnDeactivated += _ => OnActionActivated();
        }

        protected virtual void FixedUpdate()
        {
            if (!StateEnable.IsEnabledNullChecked() || !gameObjectStateEnable.IsEnabledNullChecked())
                return;

            if (rigid.velocity.y < FallThreshold)
                ApplySuspension(SuspensionMultiplier);
            else if (!airSuspension)
                ApplySuspension(FallMultiplier);
        }

        protected virtual void ApplySuspension(float multiplier)
            => rigid.velocity += Physics2D.gravity * multiplier;

        protected virtual void Jump()
        {
            Vector2 velocity = rigid.velocity;
            velocity.y = JumpSpeed;
            rigid.velocity = velocity;
        }

        protected void OnActionDeactivated()
        {
            if (!gameObjectStateEnable.IsEnabledNullChecked())
                return;

            airSuspension = false;
        }

        protected void OnActionActivated()
        {
            if (!gameObjectStateEnable.IsEnabledNullChecked())
                return;

            Jump();
            airSuspension = true;
        }
    }
}