UNITY: 2D ANIMATION

 CODE FROM THE VIDEO:

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using UnityEngine.SceneManagement;

public class Player : MonoBehaviour {

  Rigidbody2D playerRB;

  BoxCollider2D playerCollider;

  float moveSpeeed = 200.0f;

  float direction;

  float jumpHeight = 5.0f;

  LayerMask groundLayer;

  bool playerIsGrounded = false;

  bool doubleJumped = false;

  AudioSource[] audioSources;

  Animator playerAnimator;

  // Use this for initialization

  void Start () {

    playerRB = GetComponent<Rigidbody2D>();

    playerCollider = GetComponent<BoxCollider2D>();

    groundLayer = LayerMask.GetMask("Ground");

    audioSources = GetComponents<AudioSource>();

    playerAnimator = GetComponent<Animator>();

  }

  private void FixedUpdate() {

    playerIsGrounded = Physics2D.IsTouchingLayers(playerCollider, groundLayer);

  }

 

  // Update is called once per frame

  void Update () {

    direction = Input.GetAxisRaw("Horizontal");

    move(direction);

    // JUMP ROUTINE

    if(playerIsGrounded){

      doubleJumped = false;

    }

    //for the first jump

    if(Input.GetKeyDown(KeyCode.Space) && playerIsGrounded){

      jump();

    }

    //for the second jump

    if(Input.GetKeyDown(KeyCode.Space) && !playerIsGrounded && !doubleJumped){

      jump();

      doubleJumped = true;

    }

    // END JUMP ROUTINE

    // =============== ANIMATIONS =============================

    playerAnimator.SetFloat("Speed", Mathf.Abs(direction));

    playerAnimator.SetBool("Grounded", playerIsGrounded);

    // =============== END ANIMATIONS =============================

    if(transform.position.y < -3){

      //game over

      SceneManager.LoadScene("GameOverScene");

    }

  }

  void move(float direction){

    if(direction == 1){

      transform.localScale = new Vector3(1, 1, 1);

    }else if(direction == -1){ //should use this condition so that the character will not always face the left

      transform.localScale = new Vector3(-1, 1, 1);

    }

    float velocity = direction * moveSpeeed * Time.deltaTime;

    playerRB.velocity = new Vector2(velocity,playerRB.velocity.y);

  }

  void jump(){

    playerRB.velocity = new Vector2(playerRB.velocity.x, jumpHeight);

    audioSources[0].Play();

  }

  private void OnCollisionEnter2D(Collision2D otherObject) {

    if(otherObject.transform.tag.Equals("Obstacle")){

      PlayAudio(1);

    }else if(otherObject.transform.tag.Equals("Enemy")) {

      PlayAudio(2);

    }

  }

  private void OnTriggerEnter2D(Collider2D otherObject) {

    if(otherObject.transform.tag.Equals("Enemy")){

      Debug.Log("Game Over!");

    }

  }

  void PlayAudio(int index){

    StopAllAudio();

    audioSources[index].Play();

  }

  void StopAllAudio(){

    for(int i=0;i<audioSources.Length;i++){

      if(audioSources[i].isPlaying){

        audioSources[i].Stop();

      }

    }

  }

}