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Day 18 - Who Do You Hate?

2015-09-22

OldDays ste-reez-muvi Unity csharp

Table of Contents

Table of Contents

Peek into the AI for some battle insights.

More detailed violence
#

We can watch the NPCs take damage and eventually expire, but it’s not exactly super-clear where the damage is coming from. If we poke into the server code to see what’s going on:

DragonsSpine/GameObjects/GameLiving/NPC/AI/AI.cs

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  Command.ParseCommand(npc, "poke", npc.mostHated.Name);

DragonsSpine/GameObjects/GameLiving/NPC/AI/AI.cs

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  Command.ParseCommand(npc, "shoot", npc.mostHated.Name);

DragonsSpine/GameObjects/GameLiving/NPC/AI/AI.cs

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  Command.ParseCommand(npc, "kick", npc.mostHated.Name);

DragonsSpine/GameObjects/GameLiving/NPC/AI/AI.cs

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  Command.ParseCommand(npc, "kill", npc.mostHated.Name);

DragonsSpine/GameObjects/GameLiving/NPC/AI/AI.cs

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  Command.ParseCommand(npc, "jumpkick", npc.mostHated.Name + "/Ki Yah!/!");

Ok, I think we see a pattern. If we know the NPC’s mostHated, we can be pretty sure that’s who the NPC is attacking. Luckily we’ve already added it to the LiveNPC table in the database, so it’s just a matter of surfacing it.

Assets/DragonsSpine/DAL/DBNPC.cs

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npc.hasMostHated = !(dr.IsNull(dtNPCs.Columns["mostHatedId"]));
if (npc.hasMostHated) {
  npc.mostHatedId = Convert.ToInt32(dr["mostHatedId"]);
}

Assets/Managers/NpcManager.cs

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npcScripts[npc.worldNpcID].hasMostHated = npc.hasMostHated;
npcScripts[npc.worldNpcID].mostHatedId = npc.mostHatedId;

Then we make an angry red arrow to point at the object of most hatred:

Wow what a hateful arrow.

We need a way to find the position of our foe:

Assets/Managers/NpcManager.cs

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public Vector3 locateNpc(int npcId) {
  if (npcScripts.ContainsKey(npcId))
    return npcScripts[npcId].transform.position;
  else
    return Vector3.zero;
}

And now we can display our hatred:

Assets/NpcScript.cs

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// display hatred
if (hasMostHated) {
  if (myHatred == null) {
    myHatred = Instantiate(hatredPrefab,
                            Vector3.zero,
                            Quaternion.identity) as Transform;
    myHatred.parent = this.transform;
    myHatred.localPosition = new Vector3(0f, 0f, 0.2f);
    myHatredRend = myHatred.GetComponent<Renderer>();
  }
  hatedLocation = npcManager.locateNpc(mostHatedId);

  Vector3 hatredDir = hatedLocation - transform.position;
  hatredDir.z = 0f;
  hatredDir = hatredDir.normalized;

  Quaternion qDir = new Quaternion();
  qDir.SetLookRotation(hatredDir, new Vector3(0f, 0f, 1f));
  myHatred.rotation = qDir;

  myHatred.localScale = new Vector3(0.3f, 1f, 1f);
  myHatredRend.enabled = toBeSeen;
} else {
  if (myHatred != null) {
    myHatredRend.enabled = false;
  }
}

Lots of hating going on in the temple today

Cohatred
#

That’s cool, but the Update method in NpcScript is getting crowded. Can’t we do this in a cool, coroutine-ish way?

Assets/NpcScript.cs

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public bool HasMostHated {
  get { return hasMostHated; }
  set {
    if (hasMostHated != value) {
      hasMostHated = value;
      StopCoroutine("Hatred");
      StartCoroutine("Hatred");
    }
  }
}
public int MostHatedId {
  get { return mostHatedId; }
  set {
    if (mostHatedId != value) {
      mostHatedId = value;
      StopCoroutine("Hatred");
      StartCoroutine("Hatred");
    }
  }
}

Assets/NpcScript.cs

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IEnumerator Hatred () {
  while (hasMostHated && !presumedDead && hits > 0f) {
    if (myHatred == null) {
      myHatred = Instantiate(hatredPrefab,
                              Vector3.zero,
                              Quaternion.identity) as Transform;
      myHatred.parent = this.transform;
      myHatred.localPosition = new Vector3(0f, 0f, 0.2f);
      myHatredRend = myHatred.GetComponent<Renderer>();
    }
    hatedLocation = npcManager.locateNpc(mostHatedId);
    
    Vector3 hatredDir = hatedLocation - transform.position;
    hatredDir.z = 0f;
    hatredDir = hatredDir.normalized;
    
    Quaternion qDir = new Quaternion();
    qDir.SetLookRotation(hatredDir, new Vector3(0f, 0f, 1f));
    myHatred.rotation = qDir;
    
    myHatred.localScale = new Vector3(0.3f, 0.1f, 1f);
    Vector3 startPos = transform.position + hatredDir * transform.localScale.x * 0.5f;
    Vector3 endPos = hatedLocation - hatredDir * transform.localScale.x * 0.5f;
    startPos.z += 0.2f; endPos.z += 0.2f;
    myHatred.position = Vector3.Lerp(startPos, endPos, Time.time % 1f);
    myHatredRend.enabled = toBeSeen;

    yield return null;
  } 
  if (myHatred != null) {
    myHatredRend.enabled = false;
  }
}

And while we’re at it, we take advantage of the added efficiency to animate the arrows a bit.

Look how popular the priest is!

More to come

Day 18 code - client