FadingParticle.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
 
namespace Terraria.Graphics.Renderers;
 
public class FadingParticle : ABasicParticle
{
    public float FadeInNormalizedTime;
 
    public float FadeOutNormalizedTime = 1f;
 
    public Color ColorTint = Color.White;
 
    private float _timeTolive;
 
    private float _timeSinceSpawn;
 
    public override void FetchFromPool()
    {
        base.FetchFromPool();
        FadeInNormalizedTime = 0f;
        FadeOutNormalizedTime = 1f;
        ColorTint = Color.White;
        _timeTolive = 0f;
        _timeSinceSpawn = 0f;
    }
 
    public void SetTypeInfo(float timeToLive)
    {
        _timeTolive = timeToLive;
    }
 
    public override void Update(ref ParticleRendererSettings settings)
    {
        base.Update(ref settings);
        _timeSinceSpawn += 1f;
        if (_timeSinceSpawn >= _timeTolive)
        {
            base.ShouldBeRemovedFromRenderer = true;
        }
    }
 
    public override void Draw(ref ParticleRendererSettings settings, SpriteBatch spritebatch)
    {
        Color color = ColorTint * Utils.GetLerpValue(0f, FadeInNormalizedTime, _timeSinceSpawn / _timeTolive, clamped: true) * Utils.GetLerpValue(1f, FadeOutNormalizedTime, _timeSinceSpawn / _timeTolive, clamped: true);
        spritebatch.Draw(_texture.Value, settings.AnchorPosition + LocalPosition, _frame, color, Rotation, _origin, Scale, SpriteEffects.None, 0f);
    }
}