Understanding this code snippet

[PostHaste]

Good afternoon,

I'm looking to understand how this snippet of code works; it's from a NJ indicator. I know it takes readings from MACD and EMA's, but I am not sure how it fits together and produces an alert. I have uploaded the code to https://pastebin.com/GpWpZ8By as I'm not 100% sure the code I have pasted below is readable. Thanks

-PH

private void Update(int c)
{
int num = c + 1;
int num2 = c + 2;
if (((NinjaScriptBase)this).CurrentBar <= c + trendLength)
{
return;
}
macd[c] = MovingAverage(((NinjaScriptBase)this).Close, averageType, fastLength)[c] - MovingAverage(((NinjaScriptBase)this).Close, averageType, slowLength)[c];
macd1[c] = ((macd[c] >= macd[num]) ? 1 : 0);
macdup[c] = ((((NinjaScriptBase)SUM((ISeries<double>)(object)m acd1, sequentialLength))[c] == (double)sequentialLength && !(macd[c] < macd[c + trendLength])) ? 1 : 0);
macd2[c] = ((macd[c] < macd[num]) ? 1 : 0);
macddown[c] = ((((NinjaScriptBase)SUM((ISeries<double>)(object)m acd2, sequentialLength))[c] == (double)sequentialLength && !(macd[c] >= macd[c + trendLength])) ? 1 : 0);
if (macddown[num] != 0.0 && macd[c] > macd[num] && K[c] < (double)overbought)
{
upSignal[c] = ((NinjaScriptBase)this).Low[c] - 4.0 * ((NinjaScriptBase)this).TickSize;
}
if (macdup[num] != 0.0 && macd[c] < macd[num] && K[c] > (double)oversold)
{
dnSignal[c] = ((NinjaScriptBase)this).High[c] + 4.0 * ((NinjaScriptBase)this).TickSize;
}
if (useAlerts && upSignal[c] != 0.0)
{
((NinjaScriptBase)this).Alert("Up", (Priority)0, "Up", FileAlert1, 10, (Brush)Brushes.Transparent, (Brush)Brushes.Green);
}
if (useAlerts && dnSignal[c] != 0.0)
{
((NinjaScriptBase)this).Alert("Dn", (Priority)0, "Dn", FileAlert1, 10, (Brush)Brushes.Transparent, (Brush)Brushes.Red);
}
ISeries<double> close = ((NinjaScriptBase)this).Close;
EMA eMA = EMA(close, 5);
EMA eMA2 = EMA(close, 9);
EMA eMA3 = EMA(close, 21);
buy[c] = ((((NinjaScriptBase)eMA)[c] > ((NinjaScriptBase)eMA2)[c] && ((NinjaScriptBase)eMA2)[c] > ((NinjaScriptBase)eMA3)[c] && !(((NinjaScriptBase)this).Low[c] <= ((NinjaScriptBase)eMA)[c])) ? 1 : 0);
bool flag = ((NinjaScriptBase)eMA)[c] <= ((NinjaScriptBase)eMA2)[c];
bool flag2 = buy[num] == 0.0 && buy[c] != 0.0;
buysignal[c] = ((flag2 && !flag) ? 1.0 : ((buysignal[num] != 1.0 || !flag) ? buysignal[num] : 0.0));
if (buysignal[num] == 0.0)
{
_ = buysignal[c];
}
if (buysignal[num] != 0.0)
{
_ = buysignal[c];
}
sell[c] = ((((NinjaScriptBase)eMA)[c] < ((NinjaScriptBase)eMA2)[c] && ((NinjaScriptBase)eMA2)[c] < ((NinjaScriptBase)eMA3)[c] && !(((NinjaScriptBase)this).High[c] >= ((NinjaScriptBase)eMA)[c])) ? 1 : 0);
bool flag3 = ((NinjaScriptBase)eMA)[c] >= ((NinjaScriptBase)eMA2)[c];
bool flag4 = sell[num] == 0.0 && sell[c] != 0.0;
sellsignal[c] = ((flag4 && !flag3) ? 1.0 : ((sellsignal[num] != 1.0 || !flag3) ? sellsignal[num] : 0.0));
if (sellsignal[num] == 0.0)
{
_ = sellsignal[c];
}
Colorbars[c] = ((buysignal[c] == 1.0) ? 1 : ((sellsignal[c] == 1.0) ? 2 : ((buysignal[c] == 0.0 || sellsignal[c] == 0.0) ? 3 : 0)));
double num3 = EI.ZZ[c];
double num4 = ((((NinjaScriptBase)this).Close[c] * percentamount / 100.0 > Math.Max((revAmount < atrreversal * ((NinjaScriptBase)ATR(atrlength))[c]) ? 1 : 0, revAmount)) ? (((NinjaScriptBase)this).Close[c] * percentamount / 100.0) : ((revAmount < atrreversal * ((NinjaScriptBase)ATR(atrlength))[c]) ? (atrreversal * ((NinjaScriptBase)ATR(atrlength))[c]) : revAmount));
EISave[c] = ((num3 != 0.0) ? ((NinjaScriptBase)EI)[c] : EISave[num]);
double num5 = ((EISave[c] == Price(priceH)[c]) ? Price(priceH)[c] : Price(priceL)[c]) - EISave[num];
bool flag5 = num5 >= 0.0;
isConf[c] = ((Math.Abs(num5) >= num4 || (num3 == 0.0 && isConf[num] != 0.0)) ? 1 : 0);
int num6 = (flag5 ? 1 : 0);
if (num6 <= 1 && ((NinjaScriptBase)EI)[c] != 0.0)
{
EnhancedLines[c] = ((NinjaScriptBase)EI)[c];
}
EIL[c] = ((num3 == 0.0 || flag5) ? EIL[num] : Price(priceL)[c]);
EIH[c] = ((num3 == 0.0 || !flag5) ? EIH[num] : Price(priceH)[c]);
dir[c] = ((EIL[c] != EIL[num] || (Price(priceL)[c] == EIL[num] && Price(priceL)[c] == EISave[c])) ? 1.0 : ((EIH[c] != EIH[num] || (Price(priceH)[c] == EIH[num] && Price(priceH)[c] == EISave[c])) ? (-1.0) : dir[num]));
signal[c] = ((dir[c] > 0.0 && !(Price(priceL)[c] <= EIL[c])) ? ((signal[num] <= 0.0) ? 1.0 : signal[num]) : ((!(dir[c] < 0.0) || Price(priceH)[c] >= EIH[c]) ? signal[num] : ((signal[num] >= 0.0) ? (-1.0) : signal[num])));
bool flag6 = true;
bool flag7 = signal[c] > 0.0 && signal[num] <= 0.0;
bool flag8 = flag6 && signal[c] < 0.0 && signal[num] >= 0.0;
int num7 = ((NinjaScriptBase)this).CurrentBar - 10;
if (num7 > 0 && flag7 && Colorbars[c] != 3.0)
{
longS[c] = ((NinjaScriptBase)this).Low[c] - 4.0 * ((NinjaScriptBase)this).TickSize;
}
if (num7 > 0 && flag8 && Colorbars[c] != 3.0)
{
shortS[c] = ((NinjaScriptBase)this).High[c] + 4.0 * ((NinjaScriptBase)this).TickSize;
}
if (num7 != 0 && flag8)
{
revLineBot[c] = 0.0;
revLineTop[c] = ((NinjaScriptBase)this).High[num];
}
else if (num7 != 0 && flag7)
{
revLineTop[c] = 0.0;
revLineBot[c] = ((NinjaScriptBase)this).Low[num];
}
else if (revLineBot[num] != 0.0 && (Colorbars[num2] == 2.0 || Colorbars[num] == 2.0))
{
revLineBot[c] = revLineBot[num];
revLineTop[c] = 0.0;
}
else if (revLineTop[num] != 0.0 && (Colorbars[num2] == 1.0 || Colorbars[num] == 1.0))
{
revLineTop[c] = revLineTop[num];
revLineBot[c] = 0.0;
}
else
{
revLineTop[c] = 0.0;
revLineBot[c] = 0.0;
}
if (revLineBot[c] != 0.0)
{
botLine[num] = revLineBot[c];
}
if (revLineTop[c] != 0.0)
{
topLine[num] = revLineTop[c];
}
if (num7 != 0 && flag7 && Colorbars[c] == 3.0)
{
BUY[c] = ((NinjaScriptBase)this).Low[c] - 4.0 * ((NinjaScriptBase)this).TickSize;
if (PlayAlertSound)
{
((NinjaScriptBase)this).Alert(((NinjaScriptBase)th is).Name + ((NinjaScriptBase)this).CurrentBar, (Priority)0, $"BUY bar#: {((NinjaScriptBase)this).CurrentBar - c}", UpBarAlertSound, RearmSeconds, (Brush)Brushes.Black, ((Stroke)((NinjaScriptBase)this).Plots[BUY_plot]).Brush);
}
}
if (num7 != 0 && flag8 && Colorbars[c] == 3.0)
{
SELL[c] = ((NinjaScriptBase)this).High[c] + 4.0 * ((NinjaScriptBase)this).TickSize;
if (PlayAlertSound)
{
((NinjaScriptBase)this).Alert(((NinjaScriptBase)th is).Name + ((NinjaScriptBase)this).CurrentBar, (Priority)0, $"SELL bar#: {((NinjaScriptBase)this).CurrentBar - c}", DnBarAlertSound, RearmSeconds, (Brush)Brushes.Black, ((Stroke)((NinjaScriptBase)this).Plots[SELL_plot]).Brush);
}
}
}

[NinjaTrader_Gaby]

Hello PostHaste,

Thank you for your post.

While it would not be within our support model to analyze how code from a third-party source works, you can generate alerts from within a script using Alert() which is what this code is also using.

Alert() - https://ninjatrader.com/support/helpguides/nt8/alert.htm

If you have more detailed questions about how the code works please reach out to the original author of the code for clarity.