PartySky.cs

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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 PartySky : CustomSky
{
    private struct Balloon
    {
        private const int MAX_FRAMES_X = 3;
 
        private const int MAX_FRAMES_Y = 3;
 
        private const int FRAME_RATE = 14;
 
        public int Variant;
 
        private Texture2D _texture;
 
        public Vector2 Position;
 
        public float Depth;
 
        public int FrameHeight;
 
        public int FrameWidth;
 
        public float Speed;
 
        public bool Active;
 
        private int _frameCounter;
 
        public Texture2D Texture
        {
            get
            {
                return _texture;
            }
            set
            {
                _texture = value;
                FrameWidth = value.Width / 3;
                FrameHeight = value.Height / 3;
            }
        }
 
        public int Frame
        {
            get
            {
                return _frameCounter;
            }
            set
            {
                _frameCounter = value % 42;
            }
        }
 
        public Rectangle GetSourceRectangle()
        {
            return new Rectangle(FrameWidth * Variant, _frameCounter / 14 * FrameHeight, FrameWidth, FrameHeight);
        }
    }
 
    public static bool MultipleSkyWorkaroundFix;
 
    private bool _active;
 
    private bool _leaving;
 
    private float _opacity;
 
    private Asset<Texture2D>[] _textures;
 
    private Balloon[] _balloons;
 
    private UnifiedRandom _random = new UnifiedRandom();
 
    private int _balloonsDrawing;
 
    public override void OnLoad()
    {
        _textures = new Asset<Texture2D>[3];
        for (int i = 0; i < _textures.Length; i++)
        {
            _textures[i] = TextureAssets.Extra[69 + i];
        }
        GenerateBalloons(onlyMissing: false);
    }
 
    private void GenerateBalloons(bool onlyMissing)
    {
        if (!onlyMissing)
        {
            _balloons = new Balloon[Main.maxTilesY / 4];
        }
        for (int i = 0; i < _balloons.Length; i++)
        {
            if (!onlyMissing || !_balloons[i].Active)
            {
                int num = (int)((double)Main.screenPosition.Y * 0.7 - (double)Main.screenHeight);
                int minValue = (int)((double)num - Main.worldSurface * 16.0);
                _balloons[i].Position = new Vector2(_random.Next(0, Main.maxTilesX) * 16, _random.Next(minValue, num));
                ResetBalloon(i);
                _balloons[i].Active = true;
            }
        }
        _balloonsDrawing = _balloons.Length;
    }
 
    public void ResetBalloon(int i)
    {
        _balloons[i].Depth = (float)i / (float)_balloons.Length * 1.75f + 1.6f;
        _balloons[i].Speed = -1.5f - 2.5f * (float)_random.NextDouble();
        _balloons[i].Texture = _textures[_random.Next(2)].Value;
        _balloons[i].Variant = _random.Next(3);
        if (_random.Next(30) == 0)
        {
            _balloons[i].Texture = _textures[2].Value;
        }
    }
 
    private bool IsNearParty()
    {
        if (!(Main.player[Main.myPlayer].townNPCs > 0f))
        {
            return Main.SceneMetrics.PartyMonolithCount > 0;
        }
        return true;
    }
 
    public override void Update(GameTime gameTime)
    {
        if (!MultipleSkyWorkaroundFix && Main.dayRate == 0)
        {
            return;
        }
        MultipleSkyWorkaroundFix = false;
        if (Main.gamePaused || !Main.hasFocus)
        {
            return;
        }
        _opacity = Utils.Clamp(_opacity + (float)IsNearParty().ToDirectionInt() * 0.01f, 0f, 1f);
        for (int i = 0; i < _balloons.Length; i++)
        {
            if (!_balloons[i].Active)
            {
                continue;
            }
            _balloons[i].Frame++;
            _balloons[i].Position.Y += _balloons[i].Speed;
            _balloons[i].Position.X += Main.windSpeedCurrent * (3f - _balloons[i].Speed);
            if (!(_balloons[i].Position.Y < 300f))
            {
                continue;
            }
            if (!_leaving)
            {
                ResetBalloon(i);
                _balloons[i].Position = new Vector2(_random.Next(0, Main.maxTilesX) * 16, (float)Main.worldSurface * 16f + 1600f);
                if (_random.Next(30) == 0)
                {
                    _balloons[i].Texture = _textures[2].Value;
                }
            }
            else
            {
                _balloons[i].Active = false;
                _balloonsDrawing--;
            }
        }
        if (_balloonsDrawing == 0)
        {
            _active = false;
        }
        _active = true;
    }
 
    public override void Draw(SpriteBatch spriteBatch, float minDepth, float maxDepth)
    {
        if (Main.gameMenu && _active)
        {
            _active = false;
            _leaving = false;
            for (int i = 0; i < _balloons.Length; i++)
            {
                _balloons[i].Active = false;
            }
        }
        if ((double)Main.screenPosition.Y > Main.worldSurface * 16.0 || Main.gameMenu || _opacity <= 0f)
        {
            return;
        }
        int num = -1;
        int num2 = 0;
        for (int j = 0; j < _balloons.Length; j++)
        {
            float depth = _balloons[j].Depth;
            if (num == -1 && depth < maxDepth)
            {
                num = j;
            }
            if (depth <= minDepth)
            {
                break;
            }
            num2 = j;
        }
        if (num == -1)
        {
            return;
        }
        Vector2 vector = Main.screenPosition + new Vector2(Main.screenWidth >> 1, Main.screenHeight >> 1);
        Rectangle rectangle = new Rectangle(-1000, -1000, 4000, 4000);
        for (int k = num; k < num2; k++)
        {
            if (_balloons[k].Active)
            {
                Color color = new Color(Main.ColorOfTheSkies.ToVector4() * 0.9f + new Vector4(0.1f)) * 0.8f;
                float num3 = 1f;
                if (_balloons[k].Depth > 3f)
                {
                    num3 = 0.6f;
                }
                else if ((double)_balloons[k].Depth > 2.5)
                {
                    num3 = 0.7f;
                }
                else if (_balloons[k].Depth > 2f)
                {
                    num3 = 0.8f;
                }
                else if ((double)_balloons[k].Depth > 1.5)
                {
                    num3 = 0.9f;
                }
                num3 *= 0.9f;
                color = new Color((int)((float)(int)color.R * num3), (int)((float)(int)color.G * num3), (int)((float)(int)color.B * num3), (int)((float)(int)color.A * num3));
                Vector2 vector2 = new Vector2(1f / _balloons[k].Depth, 0.9f / _balloons[k].Depth);
                Vector2 position = _balloons[k].Position;
                position = (position - vector) * vector2 + vector - Main.screenPosition;
                position.X = (position.X + 500f) % 4000f;
                if (position.X < 0f)
                {
                    position.X += 4000f;
                }
                position.X -= 500f;
                if (rectangle.Contains((int)position.X, (int)position.Y))
                {
                    spriteBatch.Draw(_balloons[k].Texture, position, _balloons[k].GetSourceRectangle(), color * _opacity, 0f, Vector2.Zero, vector2.X * 2f, SpriteEffects.None, 0f);
                }
            }
        }
    }
 
    public override void Activate(Vector2 position, params object[] args)
    {
        if (_active)
        {
            _leaving = false;
            GenerateBalloons(onlyMissing: true);
        }
        else
        {
            GenerateBalloons(onlyMissing: false);
            _active = true;
            _leaving = false;
        }
    }
 
    public override void Deactivate(params object[] args)
    {
        _leaving = true;
    }
 
    public override bool IsActive()
    {
        return _active;
    }
 
    public override void Reset()
    {
        _active = false;
    }
}