CommonCode.cs

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using Microsoft.Xna.Framework;
using Terraria.ID;
using Terraria.Utilities;
 
namespace Terraria.GameContent.ItemDropRules;
 
public static class CommonCode
{
    public static void DropItemFromNPC(NPC npc, int itemId, int stack, bool scattered = false)
    {
        if (itemId > 0 && itemId < ItemID.Count)
        {
            int x = (int)npc.position.X + npc.width / 2;
            int y = (int)npc.position.Y + npc.height / 2;
            if (scattered)
            {
                x = (int)npc.position.X + Main.rand.Next(npc.width + 1);
                y = (int)npc.position.Y + Main.rand.Next(npc.height + 1);
            }
            int itemIndex = Item.NewItem(npc.GetItemSource_Loot(), x, y, 0, 0, itemId, stack, noBroadcast: false, -1);
            ModifyItemDropFromNPC(npc, itemIndex);
        }
    }
 
    public static void DropItemLocalPerClientAndSetNPCMoneyTo0(NPC npc, int itemId, int stack, bool interactionRequired = true)
    {
        if (itemId <= 0 || itemId >= ItemID.Count)
        {
            return;
        }
        if (Main.netMode == 2)
        {
            int num = Item.NewItem(npc.GetItemSource_Loot(), (int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, itemId, stack, noBroadcast: true, -1);
            Main.timeItemSlotCannotBeReusedFor[num] = 54000;
            for (int i = 0; i < 255; i++)
            {
                if (Main.player[i].active && (npc.playerInteraction[i] || !interactionRequired))
                {
                    NetMessage.SendData(90, i, -1, null, num);
                }
            }
            Main.item[num].active = false;
        }
        else
        {
            DropItemFromNPC(npc, itemId, stack);
        }
        npc.value = 0f;
    }
 
    public static void DropItemForEachInteractingPlayerOnThePlayer(NPC npc, int itemId, UnifiedRandom rng, int chanceNumerator, int chanceDenominator, int stack = 1, bool interactionRequired = true)
    {
        if (itemId <= 0 || itemId >= ItemID.Count)
        {
            return;
        }
        if (Main.netMode == 2)
        {
            for (int i = 0; i < 255; i++)
            {
                Player player = Main.player[i];
                if (player.active && (npc.playerInteraction[i] || !interactionRequired) && rng.Next(chanceDenominator) < chanceNumerator)
                {
                    int itemIndex = Item.NewItem(npc.GetItemSource_Loot(), player.position, player.Size, itemId, stack, noBroadcast: false, -1);
                    ModifyItemDropFromNPC(npc, itemIndex);
                }
            }
        }
        else if (rng.Next(chanceDenominator) < chanceNumerator)
        {
            DropItemFromNPC(npc, itemId, stack);
        }
        npc.value = 0f;
    }
 
    public static void ModifyItemDropFromNPC(NPC npc, int itemIndex)
    {
        Item item = Main.item[itemIndex];
        switch (item.type)
        {
        case 23:
            if (npc.type == 1 && npc.netID != -1 && npc.netID != -2 && npc.netID != -5 && npc.netID != -6)
            {
                item.color = npc.color;
                NetMessage.SendData(88, -1, -1, null, itemIndex, 1f);
            }
            if (Main.remixWorld && npc.type == 59)
            {
                item.color = new Color(255, 127, 0);
                NetMessage.SendData(88, -1, -1, null, itemIndex, 1f);
            }
            break;
        case 319:
            switch (npc.netID)
            {
            case 542:
                item.color = new Color(189, 148, 96, 255);
                NetMessage.SendData(88, -1, -1, null, itemIndex, 1f);
                break;
            case 543:
                item.color = new Color(112, 85, 89, 255);
                NetMessage.SendData(88, -1, -1, null, itemIndex, 1f);
                break;
            case 544:
                item.color = new Color(145, 27, 40, 255);
                NetMessage.SendData(88, -1, -1, null, itemIndex, 1f);
                break;
            case 545:
                item.color = new Color(158, 113, 164, 255);
                NetMessage.SendData(88, -1, -1, null, itemIndex, 1f);
                break;
            }
            break;
        }
    }
}