Decimation_Mod/Content/Projectiles/NPC/MagmaBall.cs

using System;
using Decimation.Content.Buffs.Debuffs;
using Decimation.Lib.Util;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria;
using Terraria.ID;
using Terraria.ModLoader;

namespace Decimation.Content.Projectiles.NPC
{
    public class MagmaBall : DecimationProjectile
    {
        public override string Texture => "Decimation/Content/Projectiles/NPC/MagmaBall";

        private bool HitPlayer
        {
            get => projectile.ai[0] == 1f;
            set => projectile.ai[0] = value ? 1 : 0;
        }

        private bool AlternativeTexture
        {
            get => projectile.localAI[0] == 1f;
            set => projectile.localAI[0] = value ? 1 : 0;
        }

        protected override void Init()
        {
            projectile.width = 22;
            projectile.height = 20;
            projectile.aiStyle = -1;
            projectile.hostile = true;
            projectile.penetrate = 1;

            AlternativeTexture = Main.rand.NextBool();
        }

        public override void AI()
        {
            Lighting.AddLight(projectile.Center, LightingUtils.Rgb255ToRgb1(255, 155, 48));
            Dust.NewDust(projectile.position, projectile.width, projectile.height, DustID.LavaMoss);

            projectile.velocity.Y += 1 / 4f;
        }

        public override void OnHitPlayer(Player target, int damage, bool crit)
        {
            DustUtils.NewDustCircle(16, target.position, target.width, target.height, DustID.Fire,
                projectile.scale * 3f);

            target.AddBuff(ModContent.BuffType<Singed>(), 300);

            HitPlayer = true;
            projectile.Kill();
        }

        public override void Kill(int timeLeft)
        {
            if (HitPlayer) return;

            DustUtils.NewDustCircle(4, projectile.position, projectile.width, projectile.height, DustID.Fire,
                projectile.scale * 3f);

            Tile currentTile = Framing.GetTileSafely((int) Math.Floor(projectile.position.X / 16f),
                (int) Math.Ceiling(projectile.position.Y / 16f));
            currentTile.liquid = 1;
            currentTile.lava(true);

            Main.PlaySound(SoundID.NPCDeath19, projectile.Center);
        }

        public override bool PreDraw(SpriteBatch spriteBatch, Color lightColor)
        {
            var frameSize = new Vector2(projectile.width, projectile.height);
            string texturePath = "Content/Projectiles/NPC/MagmaBall";
            if (AlternativeTexture) texturePath += "_Alternative";
            var texture = mod.GetTexture(texturePath);


            spriteBatch.Draw
            (
                texture,
                new Vector2(
                    projectile.position.X - Main.screenPosition.X + frameSize.X / 2,
                    projectile.position.Y - Main.screenPosition.Y + frameSize.Y / 2
                ),
                null,
                lightColor,
                projectile.rotation + MathHelper.Pi * .5f,
                frameSize * 0.5f,
                projectile.scale,
                SpriteEffects.None,
                0f
            );

            return false;
        }
    }
}