PlatformerTutorial1.cs

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


/*
This is code written for 2d platformer tutorial available at this link:
https://rookj.blogspot.com/2020/04/tutorial-how-to-make-2d-platformer-in.html
*/

public class PlatformerTutorial1 : MonoBehaviour
{


    public PlayerPhase currentPlayerPhase;






    const string movingFloatName = "Moving";
    const string jumpBoolName = "Jump";

    const float movementSpeed = 5f, jumpPower = 7f,
        groundedGravityScale = 5f, fallingGravityScale = 5f,
        jumpGravityScale = 1f;

    public LayerMask groundedLayerMask;

    Vector2 groundOverlapArea;
    float groundOffset;

    //components
    public Rigidbody2D playerRig;
    public Animator playerAnimator;
    public SpriteRenderer playerSpriteRenderer;
    public CapsuleCollider2D playerCapsuleCollider2D;



    // Start is called before the first frame update
    void Start()
    {
        playerRig = gameObject.GetComponent<Rigidbody2D>();
        playerAnimator = gameObject.GetComponent<Animator>();
        playerSpriteRenderer = gameObject.GetComponent<SpriteRenderer>();
        playerCapsuleCollider2D = gameObject.GetComponent<CapsuleCollider2D>();



        groundOverlapArea = new Vector2((
            playerCapsuleCollider2D.size.x / 2f) * .9f, .3f);
        groundOffset = playerCapsuleCollider2D.offset.y -
            playerCapsuleCollider2D.size.y / 2f;
    }

    // Update is called once per frame
    void Update()
    {

        //float x = Input.GetAxis("Horizontal");
        float x = Input.GetAxisRaw("Horizontal");

        playerRig.velocity = new Vector2(movementSpeed * x,
            playerRig.velocity.y);



        if (currentPlayerPhase == PlayerPhase.IDLE)
        {
            if (x < 0)
            {
                playerAnimator.SetFloat(movingFloatName, 1f);
                playerSpriteRenderer.flipX = true;
                playerAnimator.speed = 1f;
            }
            else if (x > 0)
            {
                playerAnimator.SetFloat(movingFloatName, 1f);
                playerSpriteRenderer.flipX = false;
                playerAnimator.speed = 1f;
            }
            else
            {

                playerAnimator.SetFloat(movingFloatName, 0f);
                playerAnimator.speed = .5f;
            }



            if (IsGrounded())
            {
                playerRig.gravityScale = fallingGravityScale;




                if (Input.GetKeyDown(KeyCode.Space))
                {
                    Jump();
                }




            }



        }
        else if (currentPlayerPhase == PlayerPhase.JUMP)
        {
            if (x < 0)
            {


                playerSpriteRenderer.flipX = true;

            }
            else if (x > 0)
            {


                playerSpriteRenderer.flipX = false;

            }



            if (IsGrounded())
            {
                if (playerRig.velocity.y <= 0)
                {
                    playerAnimator.SetBool(jumpBoolName, false);
                    currentPlayerPhase = PlayerPhase.IDLE;
                    playerRig.gravityScale = groundedGravityScale;
                }





            }
            else if (playerRig.velocity.y <= 0)
            {

                playerRig.gravityScale = fallingGravityScale;
            }




        }



    }

    bool IsGrounded()
    {
        Vector2 a = new Vector2(
            transform.position.x - groundOverlapArea.x,
            transform.position.y + groundOffset);
        Vector2 b = new Vector2(
            transform.position.x + groundOverlapArea.x,
            transform.position.y + groundOffset -
            groundOverlapArea.y);



        return (Physics2D.OverlapArea(a, b, groundedLayerMask));
    }




    void Jump()
    {




        playerRig.gravityScale = jumpGravityScale;

        playerRig.velocity = new Vector2(playerRig.velocity.x,
            jumpPower);


        currentPlayerPhase = PlayerPhase.JUMP;

        playerAnimator.SetBool(jumpBoolName, true);
        playerAnimator.speed = 1f;
    }


}

public enum PlayerPhase
{
    IDLE,JUMP
}