Class F

examples/LuminescentGrand/shared/Painter.cpp:260–296

Generator for the DrawPoints struct above. n_led: How many led's there are in total. factor: 0->1, indicates % of led's "on".

  //  n_led: How many led's there are in total.
  //  factor: 0->1, indicates % of led's "on".
  struct F {
    static DrawPoints Generate(int n_led, float factor) {
      DrawPoints out;
      fl::memset(&out, 0, sizeof(out));
      if (n_led == 0 || factor == 0.0f) {
        out.n_black0 = n_led;
        return out;
      }
      const int is_odd = (n_led % 2);
      const int n_half_lights = n_led / 2 + is_odd;
      const float f_half_fill = n_half_lights * factor;
      const int n_half_fill = static_cast<int>(f_half_fill);  // Truncates float.
      
      float fade_pix_perc = f_half_fill - static_cast<float>(n_half_fill);
      int n_fade_pix = fade_pix_perc < 1.0f;
      if (n_half_fill == 0) {
        n_fade_pix = 1;
      }
      int n_half_black = n_half_lights - n_half_fill - n_fade_pix;
      
      int n_fill_pix = 0;
      if (n_half_fill > 0) {
        n_fill_pix = n_half_fill * 2 + (is_odd ? -1 : 0);  
      }
      
      out.n_black0 = n_half_black;
      out.n_fade0 = n_fade_pix;
      out.n_fill = n_fill_pix;
      out.n_fade1 = n_fade_pix;
      if (!n_fill_pix && is_odd) {
        out.n_fade1 = 0;
      }
      out.n_black1 = n_half_black;
      out.fade_factor = fade_pix_perc;
      return out;
    }
 };
                                  
 
 led_rope->RawBeginDraw();