Add CT3536 Games Programming

third/semester1/CT3536: Games Programming/labs/Weeks 4-8/lab6/code/SmallAsteroid.cs

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+using System.Collections; 
+using System.Collections.Generic; 
+using UnityEngine; 
+ 
+public class Asteroid : MonoBehaviour { 
+ 
+    // inspector settings 
+    public Rigidbody rigidBody; 
+    public GameObject miniAsteroid;
+ 
+    // Use this for initialization 
+    void Start () { 
+        // randomise size+mass 
+        transform.localScale = new Vector3(Random.Range(0.06f,0.09f), Random.Range(0.06f,0.09f), Random.Range
+(0.06f,0.09f)); 
+        rigidBody.mass = transform.localScale.x * transform.localScale.y * transform.localScale.z; 
+ 
+        // randomise velocity 
+        rigidBody.velocity = new Vector3 (Random.Range (-20f, 20f), 0f, Random.Range (-20f, 20f)); 
+        rigidBody.angularVelocity = new Vector3 (Random.Range (-20f, 20f), Random.Range (-
+20f, 20f), Random.Range (-20f, 20f)); 
+     
+        // start periodically checking for being off-screen 
+        InvokeRepeating ("CheckScreenEdges", 0.2f, 0.2f); 
+    } 
+     
+    private void CheckScreenEdges() { 
+        Vector3 pos = transform.position;   
+        Vector3 vel = rigidBody.velocity;   
+        float xTeleport = 0f, zTeleport = 0f; 
+ 
+        if (pos.x < GameManager.screenBottomLeft.x && vel.x <= 0f) // velocity check as sanity test 
+            xTeleport = GameManager.screenWidth; 
+        else if (pos.x > GameManager.screenTopRight.x && vel.x >= 0f) 
+            xTeleport = -GameManager.screenWidth; 
+ 
+        if (pos.z < GameManager.screenBottomLeft.z && vel.z <= 0f) 
+            zTeleport = GameManager.screenHeight; 
+        else if (pos.z > GameManager.screenTopRight.z && vel.z >= 0f) 
+            zTeleport = -GameManager.screenHeight; 
+ 
+        if (xTeleport != 0f || zTeleport != 0f) 
+            transform.position = new Vector3 (pos.x + xTeleport, 0f, pos.z + zTeleport); 
+ 
+    } 
+
+    // method to spawn mini-asteroid fragments at the contact point(s) of a collision
+    private void OnCollisionEnter(Collision collision) {
+        // if collided with the spaceship, destroy it and recreate it at 0,0,0
+        if (collision.gameObject.CompareTag("spaceship")) {
+            Destroy(collision.gameObject);
+            GameManager.CreatePlayerSpaceship();
+        }
+        
+        // if collided with the bullet, destroy it and asteroid and spawn small asteroids
+        if (collision.gameObject.CompareTag("bullet")) {
+            Destroy(collision.gameObject);
+            Destroy(this);  // just destroying the small asteroid on collision
+        }
+
+        // Arraylist to keep track of the mini asteroids created for a collision
+        ArrayList fragments = new ArrayList();
+
+        foreach (ContactPoint contact in collision.contacts) {
+            // instantiating a random number of mini asteroid between 1 and 5 inclusive
+            int numFragments = Random.Range(1, 5);
+
+            for (int i = 1; i <= numFragments; i++) {
+                GameObject fragment = Instantiate(miniAsteroid);
+                fragment.transform.position = contact.point;
+                fragments.Add(fragment);
+            }        
+        }
+
+        StartCoroutine(DestroyFragments(fragments));
+    }
+
+    // coroutine to destroy all the fragments from a collision 
+    IEnumerator DestroyFragments(ArrayList fragments) {
+        yield return new WaitForSeconds(3);
+
+        foreach (GameObject fragment in fragments) {
+            Destroy(fragment);
+        }
+    }
+}