FastLED refuses to work when custom class uses Return

Projects Programming
1

I have some code that fades across a strip of the led for a project but while creating the first version of my code which may seem slightly verbose and removing the FastLED.delay function to replace it with the millis version i was going to have the function return an integer that corresponds to the amount of time left until it fills the led strip up.

The code below is the class of what im using but for some weird reason everytime i add the return function it stops working entirely.

int Display::animate(int dir) {
  unsigned long currentMillis = millis();
  
  if (dir == 1 && currentMillis - _Display_Millis > _Display_Delay) { //Forwards Animation
    leds[_Display_Position].setHSV(_Display_Current, 255, _Display_Fade_Position);
    _Display_Fade_Position = constrain(_Display_Fade_Position + FadeIncrement, 0, Brightness);
    
    if (_Display_Fade_Position >= Brightness) { //If we have brought the led to full brightness
      _Display_Fade_Position = 0;
      _Display_Position++;
    }

    if (_Display_Position == NUM_LEDS) { //If we are at the last led in the line
      _Display_Fade_Position = 255;
      _Display_Position = 17;
    }
    FastLED.show();
    _Display_Millis = currentMillis;
  } else {
    leds[_Display_Position+1].setHSV(_Display_Colour, _Display_Saturation, Brightness);
    _Display_Fade_Position = constrain(_Display_Fade_Position - FadeIncrement, 0, Brightness); //Dim the led
    leds[_Display_Position].setHSV(_Display_Current, _Display_Current_Saturation, _Display_Fade_Position);

    if (_Display_Fade_Position <= 0) {
      _Display_Fade_Position = 255;
      _Display_Position--;
    }

    if (_Display_Position <= 0) {
      _Display_Fade_Position = 0;
      _Display_Position = 0;
      leds[_Display_Position].setHSV(_Display_Colour, _Display_Saturation, Brightness);
    }
    FastLED.delay(10);
    FastLED.show();
  }
}

Yes i am still using the FastLED.delay in the reverse side of things but as i said this is my work in progress and if i add a return 0; at the end of the function it no longer does anything to the led strip.

Any ideas on what i am doing wrong?

2

Are you asking which variable corresponds to your, "amount of time left until it fills the led strip up"? Are you not using a millis() timer?

3

I do not see any return statement in the code you posted. How are we supposed to know what you tried that did not work? Please post the broken code or the broken code but with the return statement commented out.