flex_radiate for ikea lamp

//declare this somewhere else, just here as a reminder
//float divFactor;


void flex_radiate() {

  readMSGEQ7_mono(); // or ReadAudio(), whatever you want to call it

  ledindex = HALF_POS;
  k = 0;

  for (int band = 0; band < 7; band++) {

    k = (band + 1) % 7; // doesn't work perfectly, but serves as a value for the NEXT band number
    half_MAPPED_AMPLITUDE = half_mapped[band];
    // there is a lot of math here that helps smooth brightness values
    // at the EDGES of each band on the led strip, so it doesn't immediately go from one color to another
    // this helps a TON for having it wrapped around a tube
    divFactor = 1.0f / half_MAPPED_AMPLITUDE;

    // segment is a variable (declare it somewhere) for FINAL led number of each band, with ledindex
    // indicating the START of each band. it is incremented after each cycle
    segment = half_MAPPED_AMPLITUDE + ledindex;
    hue = band * 35; // or whatever you want. just determines how much of the hue spectrum fits on the strip
    //hue += mono[0] * 0.01;

    for (index = ledindex; index < segment; index++) {
      brightness = (mono[band] * (half_MAPPED_AMPLITUDE - cnt) * divFactor) + (mono[k] * cnt * divFactor);
      //brightness = map(brightness, 0, 255, 100, 255);
      leds[index] = CHSV(hue, saturation, brightness);
      // to mirror to the bottom half of the strip
      leds[HALF_POS - (index - HALF_POS)] = CHSV(hue, saturation, brightness);
      cnt++;
    }
    cnt = 0;
    ledindex += half_MAPPED_AMPLITUDE;
  }
  // ehhh, blur it. why not.
  blur2d(leds, kMatrixWidth, kMatrixHeight, 100);
  FastLED.show();
}