wave with hue

//populate a separate array for 'hue mask'

void hue_array(){
  for(byte i = 0; i < ((NUM_LEDS/2)+ 1); i++){
  static byte x = 0;
  if(x++ == 5){
    hue += 20;
    x = 0;
  }
  temp[i] = hue;
  }
}

//
void wave_fx(){
  static byte middle = NUM_LEDS/2;
  currentMillis = millis();
  if(currentMillis - previousMillis >= 10) {
    count++;
    if (count == 255) {
      count = 0;
      }
    for (byte i = 0; i <= middle; i++){
      wave = sin8((millis() / wave_scale) * i);
      hue = temp[i];	//populate hue before calling CHSV, otherwise it is destructive to leds[]
      leds[i] = CHSV(hue, 255, wave);
      }
    for(byte i = middle; i <= NUM_LEDS; i++){
      leds[i] = leds[NUM_LEDS - i];
      }
    previousMillis = currentMillis;
    LEDS.show();
  }
}