VortexSky.cs

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using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using ReLogic.Content;
using Terraria.Graphics.Effects;
using Terraria.Utilities;
 
namespace Terraria.GameContent.Skies;
 
public class VortexSky : CustomSky
{
    private struct Bolt
    {
        public Vector2 Position;
 
        public float Depth;
 
        public int Life;
 
        public bool IsAlive;
    }
 
    private UnifiedRandom _random = new UnifiedRandom();
 
    private Asset<Texture2D> _planetTexture;
 
    private Asset<Texture2D> _bgTexture;
 
    private Asset<Texture2D> _boltTexture;
 
    private Asset<Texture2D> _flashTexture;
 
    private bool _isActive;
 
    private int _ticksUntilNextBolt;
 
    private float _fadeOpacity;
 
    private Bolt[] _bolts;
 
    public override void OnLoad()
    {
        _planetTexture = Main.Assets.Request<Texture2D>("Images/Misc/VortexSky/Planet", (AssetRequestMode)1);
        _bgTexture = Main.Assets.Request<Texture2D>("Images/Misc/VortexSky/Background", (AssetRequestMode)1);
        _boltTexture = Main.Assets.Request<Texture2D>("Images/Misc/VortexSky/Bolt", (AssetRequestMode)1);
        _flashTexture = Main.Assets.Request<Texture2D>("Images/Misc/VortexSky/Flash", (AssetRequestMode)1);
    }
 
    public override void Update(GameTime gameTime)
    {
        if (_isActive)
        {
            _fadeOpacity = Math.Min(1f, 0.01f + _fadeOpacity);
        }
        else
        {
            _fadeOpacity = Math.Max(0f, _fadeOpacity - 0.01f);
        }
        if (_ticksUntilNextBolt <= 0)
        {
            _ticksUntilNextBolt = _random.Next(1, 5);
            int i;
            for (i = 0; _bolts[i].IsAlive && i != _bolts.Length - 1; i++)
            {
            }
            _bolts[i].IsAlive = true;
            _bolts[i].Position.X = _random.NextFloat() * ((float)Main.maxTilesX * 16f + 4000f) - 2000f;
            _bolts[i].Position.Y = _random.NextFloat() * 500f;
            _bolts[i].Depth = _random.NextFloat() * 8f + 2f;
            _bolts[i].Life = 30;
        }
        _ticksUntilNextBolt--;
        for (int j = 0; j < _bolts.Length; j++)
        {
            if (_bolts[j].IsAlive)
            {
                _bolts[j].Life--;
                if (_bolts[j].Life <= 0)
                {
                    _bolts[j].IsAlive = false;
                }
            }
        }
    }
 
    public override Color OnTileColor(Color inColor)
    {
        return new Color(Vector4.Lerp(inColor.ToVector4(), Vector4.One, _fadeOpacity * 0.5f));
    }
 
    public override void Draw(SpriteBatch spriteBatch, float minDepth, float maxDepth)
    {
        if (maxDepth >= float.MaxValue && minDepth < float.MaxValue)
        {
            spriteBatch.Draw(TextureAssets.BlackTile.Value, new Rectangle(0, 0, Main.screenWidth, Main.screenHeight), Color.Black * _fadeOpacity);
            spriteBatch.Draw(_bgTexture.Value, new Rectangle(0, Math.Max(0, (int)((Main.worldSurface * 16.0 - (double)Main.screenPosition.Y - 2400.0) * 0.10000000149011612)), Main.screenWidth, Main.screenHeight), Color.White * Math.Min(1f, (Main.screenPosition.Y - 800f) / 1000f) * _fadeOpacity);
            Vector2 vector = new Vector2(Main.screenWidth >> 1, Main.screenHeight >> 1);
            Vector2 vector2 = 0.01f * (new Vector2((float)Main.maxTilesX * 8f, (float)Main.worldSurface / 2f) - Main.screenPosition);
            spriteBatch.Draw(_planetTexture.Value, vector + new Vector2(-200f, -200f) + vector2, null, Color.White * 0.9f * _fadeOpacity, 0f, new Vector2(_planetTexture.Width() >> 1, _planetTexture.Height() >> 1), 1f, SpriteEffects.None, 1f);
        }
        float num = Math.Min(1f, (Main.screenPosition.Y - 1000f) / 1000f);
        Vector2 vector3 = Main.screenPosition + new Vector2(Main.screenWidth >> 1, Main.screenHeight >> 1);
        Rectangle rectangle = new Rectangle(-1000, -1000, 4000, 4000);
        for (int i = 0; i < _bolts.Length; i++)
        {
            if (!_bolts[i].IsAlive || !(_bolts[i].Depth > minDepth) || !(_bolts[i].Depth < maxDepth))
            {
                continue;
            }
            Vector2 vector4 = new Vector2(1f / _bolts[i].Depth, 0.9f / _bolts[i].Depth);
            Vector2 position = (_bolts[i].Position - vector3) * vector4 + vector3 - Main.screenPosition;
            if (rectangle.Contains((int)position.X, (int)position.Y))
            {
                Texture2D value = _boltTexture.Value;
                int life = _bolts[i].Life;
                if (life > 26 && life % 2 == 0)
                {
                    value = _flashTexture.Value;
                }
                float num2 = (float)life / 30f;
                spriteBatch.Draw(value, position, null, Color.White * num * num2 * _fadeOpacity, 0f, Vector2.Zero, vector4.X * 5f, SpriteEffects.None, 0f);
            }
        }
    }
 
    public override float GetCloudAlpha()
    {
        return (1f - _fadeOpacity) * 0.3f + 0.7f;
    }
 
    public override void Activate(Vector2 position, params object[] args)
    {
        _fadeOpacity = 0.002f;
        _isActive = true;
        _bolts = new Bolt[500];
        for (int i = 0; i < _bolts.Length; i++)
        {
            _bolts[i].IsAlive = false;
        }
    }
 
    public override void Deactivate(params object[] args)
    {
        _isActive = false;
    }
 
    public override void Reset()
    {
        _isActive = false;
    }
 
    public override bool IsActive()
    {
        if (!_isActive)
        {
            return _fadeOpacity > 0.001f;
        }
        return true;
    }
}