UIParticleLayer.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria.Graphics.Renderers;
using Terraria.UI;
 
namespace Terraria.GameContent.UI.Elements;
 
public class UIParticleLayer : UIElement
{
    public ParticleRenderer ParticleSystem;
 
    public Vector2 AnchorPositionOffsetByPercents;
 
    public Vector2 AnchorPositionOffsetByPixels;
 
    public UIParticleLayer()
    {
        IgnoresMouseInteraction = true;
        ParticleSystem = new ParticleRenderer();
        base.OnUpdate += ParticleSystemUpdate;
    }
 
    private void ParticleSystemUpdate(UIElement affectedElement)
    {
        ParticleSystem.Update();
    }
 
    public override void Recalculate()
    {
        base.Recalculate();
        Rectangle r = GetDimensions().ToRectangle();
        ParticleSystem.Settings.AnchorPosition = r.TopLeft() + AnchorPositionOffsetByPercents * r.Size() + AnchorPositionOffsetByPixels;
    }
 
    protected override void DrawSelf(SpriteBatch spriteBatch)
    {
        ParticleSystem.Draw(spriteBatch);
    }
 
    public void AddParticle(IParticle particle)
    {
        ParticleSystem.Add(particle);
    }
 
    public void ClearParticles()
    {
        ParticleSystem.Clear();
    }
}