public void DetermineSentimentColorIndex(float bid)
{
colorCurrent = colorNeutral;
if (prevBids.Length > 0)
{
signCurrent = Math.Sign(bid - prevBids.Last);
if (signCurrent != 0)
{
var sum = prevBids.Sum(pBid => Math.Sign(bid - pBid));
var index = signCurrent == Math.Sign(sum) ? Math.Abs(sum) - 1 : 0;
colorCurrent = signCurrent > 0 ? colorsGrowth[index] : colorsFall[index];
}
}
prevBids.Add(bid);
}