Creating Enemy and Structures

Creating Enemy

We will now create the object that will be target for the cannon. To do that first locates the sprite inside the Sprites directory.

1. Drag the sprite GameObject to the Scene View.
   
2. Next set the component of the Enemy GameObject.
   

   Note: To the other enemies sprites make you sure the transform components is same above the image.

3. Next select the Enemy then add an Animator Controller in the Inspector.
4. Go to Animations and create a new directory that correspond to your enemy sprite. In the Sprites directory they are type of enemies the blue, green and yellow. So create a directory that base on the enemy properties as Blue, Green and Yellow.
5. Then click Create New Clip and name it as correspond to your enemy name, in my example I used name it as Blue Idle and save inside Animations corresponding directory to avoid misplaced.
6. Then click again the Create New Clip to create another animations and name it as Blue Hurt and save it in the Animations corresponding directory. After that set each Animation Clip components shown below.

   Blue Idle
   

   Blue Hurt
   

7. After that we will create the script for the enemies. Go to the Scripts folder and create a new folder inside of it called Enemy.
8. Create a C# script called EnemyController.
9. Write these block of code inside the EnemyController Class:
   

   public int maxHitPoints;
   	public float damageCounter;
   	public GameObject deathEffect;
   	public AudioClip hurt;
    
   	private Animator animator;
   	private int hitPoints;
   	private Vector3 bounce;
   	private int maxScore;
    
   	void Awake(){
   		animator = GetComponent<Animator> ();
   	}
    
   	// Use this for initialization
   	void Start () {
   		InitializeVariables ();
   	}
    
   	// Update is called once per frame
   	void Update () {
    
   	}
    
   	void InitializeVariables(){
   		hitPoints = maxHitPoints;
   		maxScore = 1000;
   	}
    
   	void UpdateAnimationState(){
   		if(hitPoints <= 5){
   			animator.SetTrigger ("isDamage");
   		}
   	}
    
   	void OnCollisionEnter2D(Collision2D collision){
   		if(collision.relativeVelocity.magnitude > damageCounter){
   			hitPoints -= Mathf.RoundToInt(collision.relativeVelocity.magnitude);
   			UpdateScoreStatus (Mathf.RoundToInt (collision.relativeVelocity.magnitude));
   			if(GameController.instance != null && MusicController.instance != null){
   				if(GameController.instance.isMusicOn){
   					if (gameObject != null) {
   						AudioSource.PlayClipAtPoint (hurt, transform.position);
   					}
   				}
   			}
   		}
    
    
   		UpdateAnimationState ();
    
   		if(hitPoints <= 0){
   			Death ();
    
   			if(collision.gameObject.CompareTag("Player Bullet")){
   				bounce = collision.transform.GetComponent<Rigidbody2D> ().velocity;
   				bounce.y = 0f;
   				collision.transform.GetComponent<Rigidbody2D> ().velocity = bounce;
    
   			}
   		}
   	}
    
   	void Death(){
   		Destroy (gameObject);
   		GameObject newDeathEffect = Instantiate (deathEffect, transform.position, Quaternion.identity) as GameObject;
   		Destroy (newDeathEffect, 3f);
   		if(GameController.instance != null){
   			GameController.instance.score += maxScore;
   		}
   		DisplayScore ();
    
   	}
    
   	void UpdateScoreStatus(int hitScore){
   		if(GameController.instance != null){
   			GameController.instance.score += hitScore; 
   		}
   	}
    
   	void DisplayScore(){
   		GameObject scoreText = Instantiate (Resources.Load ("Score Text Canvas"), new Vector3(transform.position.x, transform.position.y + 1f), Quaternion.identity) as GameObject;
   		scoreText.transform.GetChild (0).transform.GetComponent<Text> ().text = maxScore.ToString ();
   		Destroy (scoreText, 2f);
   	}

10. After creating the script, drag the script to the Blue inspector as a component.
11. We will create now the death effect for the enemy go to GameObject and Select Particle System.
12. Rename the Particle System as EnemyDeathEffect and set the components of the Particle System as shown below.
    
13. After creating the effect, drag the effects inside the FX directory to create a prefab and delete it because we will just spawn the gameobject.
14. Lastly set the EnemyController script in the inspector as shown below.
    

Creating Structure

We will now create the object that will be deflecting any cannon bullets that try to destroy enemy. To do that first locates the sprite inside the Sprites directory.

1. Drag the sprite GameObject to the Scene View
   

   Then rename the GameObject as Wood.

2. After that we will create the script for the structure. Go to the Scripts folder and create a new folder inside of it called Object.
3. Create a C# script called Structure.
4. Write these block of code inside the Structure Class:
   

   public int maxHitPoints;
   	public Sprite[] sprite;
   	public float damageCounter;
   	public GameObject disassemble;
   	public AudioClip stoneSound, woodSound, glassSound;
   	public enum StructureType{
   		Wood,
   		Stone,
   		Glass
   	}
    
   	public StructureType structure;
    
   	public int hitpoints;
   	private SpriteRenderer spriteRenderer;
   	private Vector3 bounce;
   	private int maxScore;
   	private int counter;
    
   	void Awake(){
   		spriteRenderer = GetComponent<SpriteRenderer> ();
   	}
    
   	// Use this for initialization
   	void Start () {
   		InitializeVariables ();
   	}
    
   	// Update is called once per frame
   	void Update () {
   	}
    
   	void InitializeVariables(){
   		hitpoints = maxHitPoints;
   		maxScore = 500;
   		counter = 2;
   	}
    
   	void OnCollisionEnter2D(Collision2D collision){
   		if(collision.relativeVelocity.magnitude > damageCounter){
   			hitpoints -= Mathf.RoundToInt (collision.relativeVelocity.magnitude);
   			UpdateScoreStatus (Mathf.RoundToInt (collision.relativeVelocity.magnitude));
   		}
    
    
   		if (hitpoints <= 50) {
   			spriteRenderer.sprite = sprite [0];
   			if(counter == 2){
   				AudioManager ();
   				counter--;
   			}
    
   		}
    
   		if(hitpoints <= 30){
   			spriteRenderer.sprite = sprite [1];
   			if(counter == 1){
   				AudioManager ();
   				counter--;
   			}
   		}
    
    
   		if(hitpoints <= 0){
   			Destroyed ();
    
   			if(collision.gameObject.CompareTag("Player Bullet")){
   				bounce = collision.transform.GetComponent<Rigidbody2D> ().velocity;
   				bounce.y = 0f;
   				collision.transform.GetComponent<Rigidbody2D> ().velocity = bounce;
   			}
   		}
   	}
    
   	void Destroyed(){
   		Destroy (gameObject);
   		GameObject newDisassemble = Instantiate (disassemble, transform.position, Quaternion.identity) as GameObject;
   		Destroy (newDisassemble, 3f);
   		if(GameController.instance != null){
   			GameController.instance.score += maxScore;
   		}
    
   		GameObject scoreText = Instantiate (Resources.Load("Score Text Canvas"), new Vector3 (transform.position.x, transform.position.y + 1f, transform.position.z), Quaternion.identity) as GameObject;
   		scoreText.transform.GetChild (0).transform.GetComponent<Text> ().text = maxScore.ToString();
   		Destroy (scoreText, 2f);
   	}
    
   	void UpdateScoreStatus(int hitScore){
   		if(GameController.instance != null){
   			GameController.instance.score += hitScore; 
   		}
   	}
    
   	void AudioManager(){
   		switch (structure) {
   		case StructureType.Wood:
   			if(GameController.instance != null && MusicController.instance != null){
   				if(GameController.instance.isMusicOn){
   					if (gameObject != null) {
   						AudioSource.PlayClipAtPoint (woodSound, transform.position);
   					}
   				}
   			}
   			break;
    
   		case StructureType.Stone:
   			if(GameController.instance != null && MusicController.instance != null){
   				if(GameController.instance.isMusicOn){
   					if (gameObject != null) {
   						AudioSource.PlayClipAtPoint (stoneSound, transform.position);
   					}
   				}
   			}
   			break;
    
   		case StructureType.Glass:
   			if(GameController.instance != null && MusicController.instance != null){
   				if(GameController.instance.isMusicOn){
   					if (gameObject != null) {
   						AudioSource.PlayClipAtPoint (glassSound, transform.position);
   					}
   				}
   			}
   			break;
   		}
   	}

5. After creating the script, drag the script to the Wood inspector as a component.
6. We will create now the effect for the wood, first go to GameObject and Select Particle System.
7. Rename the Particle System as Wood Disassemble Effect and set the components of the Particle System as shown below.
   
8. After creating the effect, drag the effects inside the FX directory to create a prefab and delete it.
9. Then set the Structure script in the inspector as shown below.
   
10. Lastly duplicate the Wood GameObject into two then set each components as show below.

    Wood Wall Medium
    

    Wood Wall Long