cylon.h

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

class Cylon : public Fx1d {
  public:
    u8 delay_ms;
    Cylon(u16 num_leds, u8 fade_amount = 250, u8 delay_ms = 10) FL_NO_EXCEPT
        : Fx1d(num_leds), delay_ms(delay_ms), fade_amount(fade_amount) {}
 
    void draw(DrawContext context) FL_NO_EXCEPT override {
        if (context.leds.empty() || mNumLeds == 0) {
            return;
        }
 
        fl::span<CRGB> leds = context.leds;
 
        // Set the current LED to the current hue
        leds[position] = CHSV(hue++, 255, 255);
 
        // Fade all LEDs
        for (u16 i = 0; i < mNumLeds; i++) {
            leds[i].nscale8(fade_amount);
        }
 
        // Move the position
        if (reverse) {
            position--;
            if (position < 0) {
                position = 1;
                reverse = false;
            }
        } else {
            position++;
            if (position >= i16(mNumLeds)) {
                position = mNumLeds - 2;
                reverse = true;
            }
        }
    }
 
    fl::string fxName() const FL_NO_EXCEPT override { return "Cylon"; }
 
  private:
    u8 hue = 0;
 
    u8 fade_amount;
 
    bool reverse = false;
    i16 position = 0;
};
 
} // namespace fl