ShapeshiftParticleSystem.cs

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using Engine;
using Engine.Graphics;
 
namespace Game {
    public class ShapeshiftParticleSystem : ParticleSystem<ShapeshiftParticleSystem.Particle> {
        public class Particle : Game.Particle {
            public float Time;
 
            public float Duration;
 
            public Vector3 Velocity;
        }
 
        public Random m_random = new();
 
        public float m_generationSpeed;
 
        public float m_toGenerate;
 
        public bool Stopped { get; set; }
 
        public Vector3 Position { get; set; }
 
        public BoundingBox BoundingBox { get; set; }
 
        public ShapeshiftParticleSystem() : base(40) {
            Texture = ContentManager.Get<Texture2D>("Textures/ShapeshiftParticle");
            TextureSlotsCount = 3;
        }
 
        public override bool Simulate(float dt) {
            bool flag = false;
            m_generationSpeed = MathUtils.Min(m_generationSpeed + 15f * dt, 35f);
            m_toGenerate += m_generationSpeed * dt;
            for (int i = 0; i < Particles.Length; i++) {
                Particle particle = Particles[i];
                if (particle.IsActive) {
                    flag = true;
                    particle.Time += dt;
                    if (particle.Time <= particle.Duration) {
                        particle.Position += particle.Velocity * dt;
                        particle.FlipX = m_random.Bool();
                        particle.FlipY = m_random.Bool();
                        particle.TextureSlot = (int)MathUtils.Min(9.900001f * particle.Time / particle.Duration, 8f);
                    }
                    else {
                        particle.IsActive = false;
                    }
                }
                else if (!Stopped) {
                    while (m_toGenerate >= 1f) {
                        particle.IsActive = true;
                        particle.Position.X = m_random.Float(BoundingBox.Min.X, BoundingBox.Max.X);
                        particle.Position.Y = m_random.Float(BoundingBox.Min.Y, BoundingBox.Max.Y);
                        particle.Position.Z = m_random.Float(BoundingBox.Min.Z, BoundingBox.Max.Z);
                        particle.Velocity = new Vector3(0f, m_random.Float(0.5f, 1.5f), 0f);
                        particle.Color = Color.White;
                        particle.Size = new Vector2(0.4f);
                        particle.Time = 0f;
                        particle.Duration = m_random.Float(0.75f, 1.5f);
                        m_toGenerate -= 1f;
                    }
                }
                else {
                    m_toGenerate = 0f;
                }
            }
            m_toGenerate = MathUtils.Remainder(m_toGenerate, 1f);
            if (Stopped && !flag) {
                return true;
            }
            return false;
        }
    }
}