Added base damage to enemy health

Assets/__Scripts/Enemy.cs

@@ -9,10 +9,23 @@ public class Enemy : MonoBehaviour
     public float fireRate = 0.3f;  // Seconds/shot (Unused)
     public float health = 10;
     public int score = 100;      // Points earned for destroying this
+    public float showDamageDuration = 0.1f;
+    [Header("Set Dynamically: Enemy")]
+    public Color[] originalColors;
+    public Material[] materials;
+    public bool showingDamage = false;
+    public float damageDoneTime;
+    public bool notifiedOfDestruction = false;
     protected BoundsCheck bndCheck;
 
     void Awake() {
         bndCheck = GetComponent<BoundsCheck>();
+        // Get materials and colors for this GameObject and its children
+        materials = Utils.GetAllMaterials(gameObject);
+        originalColors = new Color[materials.Length];
+        for (int i = 0; i < materials.Length; ++i) {
+            originalColors[i] = materials[i].color;
+        }
     }
 
     // This is a Property: A method that acts like a field
@@ -33,24 +46,56 @@ public class Enemy : MonoBehaviour
 
     void OnCollisionEnter(Collision coll) {
         GameObject otherGO = coll.gameObject;
-        if (otherGO.tag == "ProjectileHero") {
-            Destroy(otherGO); // Destroy the Projectile
-            Destroy(gameObject); // Destroy this Enemy GameObject
-        } else {
-            print("Enemy hit by non-ProjectileHero: " + otherGO.name);
+        switch (otherGO.tag) {
+            case "ProjectileHero":
+                Projectile p = otherGO.GetComponent<Projectile>();
+                // If this Enemy is off screen, don't damage it.
+                if (!bndCheck.isOnScreen) {
+                    Destroy(otherGO);
+                    break;
+                }
+
+                // Hurt this Enemy
+                ShowDamage();
+                health -= 1;
+                if (health <= 0) {
+                    if (!notifiedOfDestruction) {
+                        Main.S.ShipDestroyed(this);
+                    }
+                    notifiedOfDestruction = true;
+                    // Destroy this Enemy
+                    Destroy(this.gameObject);
+                }
+                Destroy(otherGO);
+                break;
+
+            default:
+                print("Enemy hit by non-ProjectileHero: " + otherGO.name );
+                break;
         }
     }
 
-    // Start is called before the first frame update
-    void Start()
-    {
-        
+    void ShowDamage() {
+        foreach(Material m in materials) {
+            m.color = Color.red;
+        }
+        showingDamage = true;
+        damageDoneTime = Time.time + showDamageDuration; 
+    }
+
+    void UnShowDamage() {
+        for (int i = 0; i < materials.Length; ++i) {
+            materials[i].color = originalColors[i];
+        }
+        showingDamage = false;
     }
 
-    // Update is called once per frame
     void Update()
     {
         Move();
+        if (showingDamage && Time.time > damageDoneTime) {
+            UnShowDamage();
+        }
         if (bndCheck != null && bndCheck.offDown) {
             // We're off the bottom, so destroy this GameObject
             Destroy(gameObject);

Assets/__Scripts/Enemy_4.cs

@@ -64,4 +64,96 @@ public class Enemy_4 : Enemy
         u = 1 - Mathf.Pow(1 - u, 2); // Apply East Out easing to u
         pos = (1 - u) * p0 + u*p1; // Simple linear interpolation
     }
+
+    // These two functions find a Part in parts based on name or GameObject
+    Part FindPart(string n) {
+        foreach(Part prt in parts) {
+            if (prt.name == n) {
+                return prt;
+            }
+        }
+        return null;
+    }
+
+    Part FindPart(GameObject go) {
+        foreach(Part prt in parts) {
+            if (prt.go == go) {
+                return prt;
+            }
+        }
+        return null;
+    }
+
+    // These functions return true if the Part has been destroyed
+    bool Destroyed(GameObject go) {
+        return Destroyed(FindPart(go));
+    }
+    
+    bool Destroyed(string n) {
+        return Destroyed(FindPart(n));
+    }
+    
+    bool Destroyed(Part prt) {
+        if (prt == null) {
+            return true;
+        }
+        return prt.health <= 0;
+    }
+
+    // This changes the color of just one Part to red instead of the whole ship
+    void ShowLocalizedDamage(Material m) {
+        m.color = Color.red;
+        damageDoneTime = Time.time + showDamageDuration;
+        showingDamage = true;
+    }
+    
+    // This will override the OnCollisionEnter that is part of Enemy.cs
+    void OnCollisionEnter(Collision coll) {
+        GameObject other = coll.gameObject;
+        switch (other.tag) {
+            case "ProjectileHero":
+                Projectile p = other.GetComponent<Projectile>();
+                // If this Enemy is off screen, don't damage it.
+                if (!bndCheck.isOnScreen) {
+                    Destroy(other);
+                    break;
+                }
+                // Hurt this Enemy
+                GameObject goHit = coll.contacts[0].thisCollider.gameObject;
+                Part prtHit = FindPart(goHit);
+                if (prtHit == null) {
+                    goHit = coll.contacts[0].otherCollider.gameObject;
+                    prtHit = FindPart(goHit);
+                }
+                // Check whether this part is still protected
+                if (prtHit.protectedBy != null) {
+                    foreach(string s in prtHit.protectedBy) {
+                        // If one of the protecting parts hasn't been destroyed...
+                        if (!Destroyed(s)) {
+                            // ...then don't damage this part yet
+                            Destroy(other);
+                            return;
+                        }
+                    }
+                }
+                prtHit.health -= 1;
+                ShowLocalizedDamage(prtHit.mat);
+                if (prtHit.health <= 0) {
+                    prtHit.go.SetActive(false);
+                }
+                bool allDestroyed = true;
+                foreach (Part prt in parts) {
+                    if (!Destroyed(prt)) {
+                        allDestroyed = false;
+                        break;
+                    }
+                }
+                if (allDestroyed) {
+                    Main.S.ShipDestroyed(this);
+                    Destroy(this.gameObject);
+                }
+                Destroy(other);
+                break;
+        }
+    }
 }

Assets/__Scripts/Main.cs

@@ -12,6 +12,10 @@ public class Main : MonoBehaviour
     public float enemyDefaultPadding = 1.5f;
     private BoundsCheck bndCheck;
 
+    public void ShipDestroyed(Enemy e) {
+        // Potentially generate a Powerup
+    }
+
     void Awake() {
         S = this;
         // Set bndCheck to reference the BoundsCheck component of this GameObject

Assets/__Scripts/Utils.cs

@@ -0,0 +1,19 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Utils : MonoBehaviour
+{
+
+    // Returns a list of all Materials on this GameObject and its children
+    static public Material[] GetAllMaterials(GameObject go) {
+        Renderer[] rends = go.GetComponentsInChildren<Renderer>();
+
+        List<Material> mats = new List<Material>();
+        foreach(Renderer rend in rends) {
+            mats.Add(rend.material);
+        }
+
+        return(mats.ToArray());
+    }
+}

Assets/__Scripts/Utils.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 1443ee9b4e9c59bb8a6ccc76415bb003
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: