particles.h

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#pragma once
 
#include "fl/stl/vector.h"
#include "fl/stl/span.h"
#include "fl/fx/fx1d.h"
#include "fl/stl/noexcept.h"
 
namespace fl {
 
FASTLED_SHARED_PTR(Particles1d);

class Particles1d : public Fx1d {
  public:
    Particles1d(u16 num_leds, u8 max_particles = 10, u8 fade_rate = 2);
 
    ~Particles1d() FL_NOEXCEPT;

    void draw(DrawContext context) override;

    void spawnRandomParticle();

    void setLifetime(u16 lifetime_ms);

    void setOverdrawCount(u8 count);

    void setSpeed(float speed);

    void setFadeRate(u8 fade_rate);

    void setCyclical(bool cyclical);
 
    fl::string fxName() const override;
 
  private:
    struct Particle {
        float pos;          
        float baseVel;      
        CHSV baseColor;     
        u32 birthTime;      
        u32 lifetime;       
        bool active;        
 
        Particle() FL_NOEXCEPT;

        float getPower(u32 now) const;

        void spawn(u16 numLeds);

        void spawn(float pos, float baseVel, CHSV baseColor, u32 lifetime);

        void update(u32 now, u16 numLeds, float speedMultiplier, bool cyclical);

        void draw(fl::span<CRGB> leds, u32 now, u16 numLeds);
    };
 
    u8 mFadeRate;                    
    u16 mLifetimeMs = 4000;          
    u8 mOverdrawCount;               
    float mSpeedMultiplier;          
    bool mCyclical;                  
    fl::vector<Particle> mParticles; 
};
 
} // namespace fl