public static float computeDiscardAlpha(float amount,float range){
  if (Math.abs(amount) < 1.0f)   return 1.0f;
  float t=amount / range;
  t=MathUtils.clamp(t,-1.0f,1.0f);
  return 1.f - Math.abs(t);
}

public static float computeDiscardAlpha ( float amount , float range ) { if ( Math . abs ( amount ) < 1.0f ) return 1.0f ; float t = amount / range ; t = MathUtils . clamp ( t , - 1.0f , 1.0f ) ; return 1.f - Math . abs ( t ) ; }
computes the alpha value of the tab based on its discard status .
