tAPI [Tutorial] Custom Bosses - NPC AI and Server Syncing

Kahan · May 15, 2017

Code:

using System;
using System.IO;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria;
using Terraria.ID;
using Terraria.ModLoader;

namespace KahanMod.NPCs.Bosses
{
    public class Yama : ModNPC
    {
        public override void SetDefaults()
        {
            npc.name = "Yama";
            npc.displayName = "Yama";
            npc.aiStyle = 0;
            npc.lifeMax = 9000; 
            npc.damage = 40;
            npc.defense = 25; 
            npc.knockBackResist = 0f;
            npc.width = 60;
            npc.height = 30;
            animationType = NPCID.BoundGoblin;
            Main.npcFrameCount[npc.type] = 2;  
            npc.value = Item.buyPrice(0, 0, 10, 0);
            npc.npcSlots = 1f;
            npc.boss = true;
            npc.lavaImmune = true;
            npc.noGravity = true;
            npc.noTileCollide = true;
            npc.HitSound = SoundID.NPCHit1;
            npc.DeathSound = SoundID.NPCDeath17;
            npc.buffImmune[24] = false;
            music = MusicID.Boss2;
            npc.netAlways = true;
        }
        public override void AutoloadHead(ref string headTexture, ref string bossHeadTexture)
        {
            bossHeadTexture = "KahanMod/NPCs/Bosses/Yama_Head_Boss";
        }
        public override void BossLoot(ref string name, ref int potionType)
        {
            potionType = ItemID.HealingPotion; 
             if (Main.expertMode)
            {
                Item.NewItem((int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, mod.ItemType("YamaTreasureBag"));
            }
            else
          {                          
            int choice = Main.rand.Next(3);
            if (choice == 0)
            {
                  Item.NewItem((int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, mod.ItemType("YoyoMold"));
            }
            if (choice == 1)
            {
                 Item.NewItem((int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, mod.ItemType("FlailMold"));
            }
            if (choice == 2)
            {
                 Item.NewItem((int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, mod.ItemType("KatanaMold"));
            }
            Item.NewItem((int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, mod.ItemType("RedFragment"), Main.rand.Next(5, 10));
          }
      
        }
        public override void ScaleExpertStats(int numPlayers, float bossLifeScale)
        {
            npc.lifeMax = (int)(npc.lifeMax * 0.8f * bossLifeScale);
            npc.damage = (int)(npc.damage * 0.6f);
        }
        public override void AI()
        {
         Player player = Main.player[npc.target];
         Vector2 moveTo = player.Center + new Vector2(0f, -200f);
         float speed = 3f;
         Vector2 move = moveTo - npc.Center;
         float magnitude = (float) Math.Sqrt(move.X * move.X + move.Y * move.Y);
         move *= speed / magnitude;
         npc.velocity = move;
      
         if (npc.ai[0] % 600 == 3)
            {
                NPC.NewNPC((int)npc.position.X, (int)npc.position.Y, mod.NPCType("TorturedSoul"));
            }
            npc.ai[1] += 0;
        }
    }
}

Thanks again

Kahan · May 17, 2017

Sin Costan said:
Ok, so basically, what you are doing is trying to spawn an NPC when the counter divided by 600 gets a remainder of 3. The only problem is that you never set up the counter at all, meaning you can just add "npc.ai[0] += 1" anywhere inside the AI. Instead of checking if the remainder is 3, just switch the 3 to 0. You can remove the "npc.ai[1] += 0" since you never use that counter.

How I can make that he will spawn 5 npc every 20 seconds

Sin Costan · May 17, 2017

Kahan ( ͡° ͜ʖ ͡°) said:
How I can make that he will spawn 5 npc every 20 seconds

Terraria runs at around 60 ticks per 1 second, meaning you will need to make the counter check if the remainder is 0 when the counter is a multiple of (60 * 20). So it should have a semblance of:

Code:

npc.ai[0] += 1;
if(npc.ai[0] %(60 * 20) == 0)
{
   for(int i = 0; i < 5; i++)
   {
      //NPC spawning code
   }
}

Kahan · May 17, 2017

Sin Costan said:
Terraria runs at around 60 ticks per 1 second, meaning you will need to make the counter check if the remainder is 0 when the counter is a multiple of (60 * 20). So it should have a semblance of:

Code:

npc.ai[0] += 1; if(npc.ai[0] %(60 * 20) == 0) { for(int i = 0; i < 5; i++) { //NPC spawning code } }

Thanks for third time

yanssenklugh · May 18, 2017

How can add attack phases for my boss?

Kahan · May 19, 2017

Sin Costan said:
Terraria runs at around 60 ticks per 1 second, meaning you will need to make the counter check if the remainder is 0 when the counter is a multiple of (60 * 20). So it should have a semblance of:

Code:

npc.ai[0] += 1; if(npc.ai[0] %(60 * 20) == 0) { for(int i = 0; i < 5; i++) { //NPC spawning code } }

and how to make boss spawns 1 npc when at 50% life

Sin Costan · May 19, 2017

Kahan ( ͡° ͜ʖ ͡°) said:
and how to make boss spawns 1 npc when at 50% life

Just have the AI() hook check if the npc's health is about half, so you do an if statement getting the npc's current health (npc.life) and check that with the npc's max health (npc.lifeMax). Then you do the NPC spawning code in the if statement.

yanssenklugh · May 19, 2017

How can add attack phases for my boss?

Sin Costan · May 19, 2017

yanssenklugh said:
How can add attack phases for my boss?

Just use a counter.

yanssenklugh · May 19, 2017

how can I make a counter?

Sin Costan · May 19, 2017

yanssenklugh said:
how can I make a counter?

Use npc.ai[0] and npc.ai[1] as your counters

yanssenklugh · May 19, 2017

Am I doing it right?

using System;
using System.IO;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System;
using Microsoft.Xna.Framework;
using Terraria;
using Terraria.ID;
using Terraria.ModLoader;

namespace YourModName.NPCs.Boss
{
public class StormElemental : ModNPC
{
public override void SetDefaults()
{
npc.name = "Storm Elemental";
npc.displayName = "Storm Elemental";
npc.width = 98;
npc.height = 84;
npc.damage = 12;
npc.defense = 5;
npc.lifeMax = 2000;
npc.HitSound = SoundID.NPCHit3;
npc.DeathSound = SoundID.NPCDeath6;
npc.value = 60f;
npc.knockBackResist = 0.9f;
npc.aiStyle = 49;
Main.npcFrameCount[npc.type] = 1;
aiType = NPCID.AngryNimbus; //npc behavior
animationType = NPCID.AngryNimbus;
npc.npcSlots = 1f;
npc.boss = true;
music = MusicID.Boss1;
npc.netAlways = true;
}
public override void FindFrame(int frameHeight)
{
npc.frameCounter -= 0.5F; // Determines the animation speed. Higher value = faster animation.
npc.frameCounter %= Main.npcFrameCount[npc.type];
int frame = (int)npc.frameCounter;
npc.frame.Y = frame * frameHeight;

npc.spriteDirection = npc.direction;

}
public override void AutoloadHead(ref string headTexture, ref string bossHeadTexture)
{
bossHeadTexture = "YourModName/NPCs/Boss/BossName_Head_Boss1"; //the boss head texture
}
public override void BossLoot(ref string name, ref int potionType)
{
potionType = ItemID.LesserHealingPotion; //boss drops
Item.NewItem((int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, mod.ItemType("CrabHand"));
}
public override void ScaleExpertStats(int numPlayers, float bossLifeScale)
{
npc.lifeMax = (int)(npc.lifeMax * 0.579f * bossLifeScale); //boss life scale in expertmode
npc.damage = (int)(npc.damage * 0.6f); //boss damage increase in expermode
}
public override void AI()
{
npc.ai[0]++;
Player P = Main.player[npc.target];
if (npc.target < 0 || npc.target == 255 || Main.player[npc.target].dead || !Main.player[npc.target].active)
{
npc.TargetClosest(true);
}
npc.netUpdate = true;

npc.ai[1]++;
if (npc.ai[1] >= 100) // 230 is projectile fire rate
{
float Speed = 15f; //projectile speed
Vector2 vector8 = new Vector2(npc.position.X + (npc.width / 2), npc.position.Y + (npc.height / 2));
int damage = 15; //projectile damage
int type = mod.ProjectileType("Storm"); //put your projectile
Main.PlaySound(25, (int)npc.position.X, (int)npc.position.Y, 17);
float rotation = (float)Math.Atan2(vector8.Y - (P.position.Y + (P.height * 0.5f)), vector8.X - (P.position.X + (P.width * 0.5f)));
int num54 = Projectile.NewProjectile(vector8.X, vector8.Y, (float)((Math.Cos(rotation) * Speed) * -1), (float)((Math.Sin(rotation) * Speed) * -1), type, damage, 0f, 0);
npc.ai[1] = 0;

npc.ai[1]++;
if (npc.ai[1] >= 50) // 230 is projectile fire rate
{
Projectile.NewProjectile(projectile.position.X, projectile.position.Y, 0, 0, 291, (int) (projectile.damage * 1.5), projectile.knockBack, Main.myPlayer); // 296 is the explosion from the Inferno Fork
}
}
}
}

(it's the last part that I added the counter for)

Sin Costan · May 19, 2017

yanssenklugh said:
Am I doing it right?

using System;
using System.IO;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System;
using Microsoft.Xna.Framework;
using Terraria;
using Terraria.ID;
using Terraria.ModLoader;

namespace YourModName.NPCs.Boss
{
public class StormElemental : ModNPC
{
public override void SetDefaults()
{
npc.name = "Storm Elemental";
npc.displayName = "Storm Elemental";
npc.width = 98;
npc.height = 84;
npc.damage = 12;
npc.defense = 5;
npc.lifeMax = 2000;
npc.HitSound = SoundID.NPCHit3;
npc.DeathSound = SoundID.NPCDeath6;
npc.value = 60f;
npc.knockBackResist = 0.9f;
npc.aiStyle = 49;
Main.npcFrameCount[npc.type] = 1;
aiType = NPCID.AngryNimbus; //npc behavior
animationType = NPCID.AngryNimbus;
npc.npcSlots = 1f;
npc.boss = true;
music = MusicID.Boss1;
npc.netAlways = true;
}
public override void FindFrame(int frameHeight)
{
npc.frameCounter -= 0.5F; // Determines the animation speed. Higher value = faster animation.
npc.frameCounter %= Main.npcFrameCount[npc.type];
int frame = (int)npc.frameCounter;
npc.frame.Y = frame * frameHeight;

npc.spriteDirection = npc.direction;

}
public override void AutoloadHead(ref string headTexture, ref string bossHeadTexture)
{
bossHeadTexture = "YourModName/NPCs/Boss/BossName_Head_Boss1"; //the boss head texture
}
public override void BossLoot(ref string name, ref int potionType)
{
potionType = ItemID.LesserHealingPotion; //boss drops
Item.NewItem((int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, mod.ItemType("CrabHand"));
}
public override void ScaleExpertStats(int numPlayers, float bossLifeScale)
{
npc.lifeMax = (int)(npc.lifeMax * 0.579f * bossLifeScale); //boss life scale in expertmode
npc.damage = (int)(npc.damage * 0.6f); //boss damage increase in expermode
}
public override void AI()
{
npc.ai[0]++;
Player P = Main.player[npc.target];
if (npc.target < 0 || npc.target == 255 || Main.player[npc.target].dead || !Main.player[npc.target].active)
{
npc.TargetClosest(true);
}
npc.netUpdate = true;

npc.ai[1]++;
if (npc.ai[1] >= 100) // 230 is projectile fire rate
{
float Speed = 15f; //projectile speed
Vector2 vector8 = new Vector2(npc.position.X + (npc.width / 2), npc.position.Y + (npc.height / 2));
int damage = 15; //projectile damage
int type = mod.ProjectileType("Storm"); //put your projectile
Main.PlaySound(25, (int)npc.position.X, (int)npc.position.Y, 17);
float rotation = (float)Math.Atan2(vector8.Y - (P.position.Y + (P.height * 0.5f)), vector8.X - (P.position.X + (P.width * 0.5f)));
int num54 = Projectile.NewProjectile(vector8.X, vector8.Y, (float)((Math.Cos(rotation) * Speed) * -1), (float)((Math.Sin(rotation) * Speed) * -1), type, damage, 0f, 0);
npc.ai[1] = 0;

npc.ai[1]++;
if (npc.ai[1] >= 50) // 230 is projectile fire rate
{
Projectile.NewProjectile(projectile.position.X, projectile.position.Y, 0, 0, 291, (int) (projectile.damage * 1.5), projectile.knockBack, Main.myPlayer); // 296 is the explosion from the Inferno Fork
}
}
}
}

(it's the last part that I added the counter for)

That's not a good idea, it will never get called. Also, the projectile you spawn in the new thing is friendly, so you need to make it hostile.

yanssenklugh · May 19, 2017

ok so I need the projectile id but what should I position the counter and the projectile? What am I doing wrong?

Sin Costan · May 19, 2017

yanssenklugh said:
ok so I need the projectile id but what should I position the counter and the projectile? What am I doing wrong?

No need for a new ID, just save the value from Projectile.NewProjectile into an "int", and use the int as an index for "Main.projectiles[index]" and set that to hostile. You only need one counter. You can probably figure out how to use a counter.

yanssenklugh · May 19, 2017

like this?

Code:

            if (npc.ai[1] >= 50)  // 230 is projectile fire rate
            {
             int Projectile.NewProjectile(projectile.position.X, projectile.position.Y, 0, 0, 291, (int) (projectile.damage * 1.5), projectile.knockBack, Main.myPlayer); // 296 is the explosion from the Inferno Fork
            }
        }
    }
}

Sin Costan · May 19, 2017

yanssenklugh said:

like this?

Code:

            if (npc.ai[1] >= 50)  // 230 is projectile fire rate
            {
             int Projectile.NewProjectile(projectile.position.X, projectile.position.Y, 0, 0, 291, (int) (projectile.damage * 1.5), projectile.knockBack, Main.myPlayer); // 296 is the explosion from the Inferno Fork
            }
        }
    }
}

So, uhh, just as a recommendation, you should probably look up a coding guide/tutorial. It will benefit you greatly. There are great guides in the Official tModLoader Help Thread.

yanssenklugh · May 20, 2017

Okay, Am I right?

Code:

          npc.ai[0] += 1;
          if(npc.ai[0] %(60 * 5) == 0)
          {
             for(int i = 0; i < 5; i++)
             {
               
             }
          } 

            int rand = Main.rand.Next(5);
            int num = mod.ProjectileType("Gust"); 
            }
        }
    }
}

yanssenklugh · May 20, 2017

Or maybe this?

Code:

          npc.ai[0] += 1;
          if (npc.ai[1] >= 100)  // 230 is projectile fire rate
          {
             for(int i = 0; i < 255; i++)
             {
               
             }
          } 

            int rand = Main.rand.Next(5);
            int num = mod.ProjectileType("Gust"); 
            }
        }
    }
}

Kahan · May 21, 2017

error: in class declaration, structure or member interface exist incorrect token if

Code:

using System;
using System.IO;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria;
using Terraria.ID;
using Terraria.ModLoader;

namespace KahanMod.NPCs.Bosses
{
    public class Yama : ModNPC
    {
        public override void SetDefaults()
        {
            npc.name = "Yama";
            npc.displayName = "Yama";
            npc.aiStyle = 0; 
            npc.lifeMax = 9000;  
            npc.damage = 40; 
            npc.defense = 25;  
            npc.knockBackResist = 0f;
            npc.width = 60;
            npc.height = 30;
            animationType = NPCID.BoundGoblin; 
            Main.npcFrameCount[npc.type] = 2;   
            npc.value = Item.buyPrice(0, 0, 10, 0);
            npc.npcSlots = 1f;
            npc.boss = true; 
            npc.lavaImmune = true;
            npc.noGravity = true;
            npc.noTileCollide = true;
            npc.HitSound = SoundID.NPCHit1;
            npc.DeathSound = SoundID.NPCDeath17;
            npc.buffImmune[24] = false;
            music = MusicID.Boss2;
            npc.netAlways = true;
        }
        public override void AutoloadHead(ref string headTexture, ref string bossHeadTexture)
        {
            bossHeadTexture = "KahanMod/NPCs/Bosses/Yama_Head_Boss";
        }
        public override void BossLoot(ref string name, ref int potionType)
        {
            potionType = ItemID.HealingPotion;  
             if (Main.expertMode)
            {
                Item.NewItem((int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, mod.ItemType("YamaTreasureBag"));
            }
            else
          {                           
            int choice = Main.rand.Next(3);
            if (choice == 0)
            {
                  Item.NewItem((int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, mod.ItemType("YoyoMold"));
            }
            if (choice == 1)
            {
                 Item.NewItem((int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, mod.ItemType("FlailMold"));
            }
            if (choice == 2)
            {
                 Item.NewItem((int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, mod.ItemType("KatanaMold"));
            }
            Item.NewItem((int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, mod.ItemType("RedFragment"), Main.rand.Next(5, 10));
          }
       
        }
        public override void ScaleExpertStats(int numPlayers, float bossLifeScale)
        {
            npc.lifeMax = (int)(npc.lifeMax * 0.8f * bossLifeScale); 
            npc.damage = (int)(npc.damage * 0.6f); 
        }
        public override void AI()
        {
         Player player = Main.player[npc.target];
         Vector2 moveTo = player.Center + new Vector2(0f, -200f);
         float speed = 3f;
         Vector2 move = moveTo - npc.Center;
         float magnitude = (float) Math.Sqrt(move.X * move.X + move.Y * move.Y);
         move *= speed / magnitude;
         npc.velocity = move;
       
        npc.ai[0] += 1;
        if(npc.ai[0] %(60 * 10) == 0)
        {
            for(int i = 0; i < 5; i++)
            {

               if (npc.ai[0] % 600 == 0)
        
               {
                 NPC.NewNPC((int)npc.position.X, (int)npc.position.Y, mod.NPCType("TorturedSoul"));  //NPC name
               }

              }
            }
        }
         if (npc.life <= npc.lifeMax * 0.5f)
         {
             for(int i = 0; i < 1; i++)
            {

               if (npc.ai[0] % 600 == 0)
        
               {
                 NPC.NewNPC((int)npc.position.X, (int)npc.position.Y, mod.NPCType("HorseFace"));  //NPC name
               }

              }
            }
         }
    }
}

what I did wrong

tAPI [Tutorial] Custom Bosses - NPC AI and Server Syncing

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