GasParticle.cs

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using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria.GameContent;
 
namespace Terraria.Graphics.Renderers;
 
public class GasParticle : ABasicParticle
{
    public float FadeInNormalizedTime = 0.25f;
 
    public float FadeOutNormalizedTime = 0.75f;
 
    public float TimeToLive = 80f;
 
    public Color ColorTint;
 
    public float Opacity;
 
    public float AdditiveAmount = 1f;
 
    public float FadeInEnd = 20f;
 
    public float FadeOutStart = 30f;
 
    public float FadeOutEnd = 45f;
 
    public float SlowdownScalar = 0.95f;
 
    private float _timeSinceSpawn;
 
    public Color LightColorTint;
 
    private int _internalIndentifier;
 
    public float InitialScale = 1f;
 
    public override void FetchFromPool()
    {
        base.FetchFromPool();
        ColorTint = Color.Transparent;
        _timeSinceSpawn = 0f;
        Opacity = 0f;
        FadeInNormalizedTime = 0.25f;
        FadeOutNormalizedTime = 0.75f;
        TimeToLive = 80f;
        _internalIndentifier = Main.rand.Next(255);
        SlowdownScalar = 0.95f;
        LightColorTint = Color.Transparent;
        InitialScale = 1f;
    }
 
    public override void Update(ref ParticleRendererSettings settings)
    {
        base.Update(ref settings);
        _timeSinceSpawn += 1f;
        float fromValue = _timeSinceSpawn / TimeToLive;
        Scale = Vector2.One * InitialScale * Utils.Remap(fromValue, 0f, 0.95f, 1f, 1.3f);
        Opacity = MathHelper.Clamp(Utils.Remap(fromValue, 0f, FadeInNormalizedTime, 0f, 1f) * Utils.Remap(fromValue, FadeOutNormalizedTime, 1f, 1f, 0f), 0f, 1f) * 0.85f;
        Rotation = (float)_internalIndentifier * 0.4002029f + _timeSinceSpawn * ((float)Math.PI * 2f) / 480f * 0.5f;
        Velocity *= SlowdownScalar;
        if (LightColorTint != Color.Transparent)
        {
            Color color = LightColorTint * Opacity;
            Lighting.AddLight(LocalPosition, (float)(int)color.R / 255f, (float)(int)color.G / 255f, (float)(int)color.B / 255f);
        }
        if (_timeSinceSpawn >= TimeToLive)
        {
            base.ShouldBeRemovedFromRenderer = true;
        }
    }
 
    public override void Draw(ref ParticleRendererSettings settings, SpriteBatch spritebatch)
    {
        Main.instance.LoadProjectile(1007);
        Texture2D value = TextureAssets.Projectile[1007].Value;
        Vector2 origin = new Vector2(value.Width / 2, value.Height / 2);
        Vector2 position = settings.AnchorPosition + LocalPosition;
        Color color = Color.Lerp(Lighting.GetColor(LocalPosition.ToTileCoordinates()), ColorTint, 0.2f) * Opacity;
        Vector2 scale = Scale;
        spritebatch.Draw(value, position, value.Frame(), color, Rotation, origin, scale, SpriteEffects.None, 0f);
        spritebatch.Draw(value, position, value.Frame(), color * 0.25f, Rotation, origin, scale * (1f + Opacity * 1.5f), SpriteEffects.None, 0f);
    }
}