Hi,

To identify the previous bar below the 20 ema you can compare the price (open, close, high, low whichever you want)  to the ema. 

e.g. if ( MarketSeries.High[index-1] < ema.Result[index-1] ) 

where ema is: private ExponentialMovingAverage ema; 

initialized in the Initialize() method:

e.g. ema = Indicators.ExponentialMovingAverage(MarketSeries.Close, 20);

To see if it is a bear bar you compare the open to close

e.g. if ( MarketSeries.Open[index-1] > MarketSeries.Close[index-1]

You can do the same for as far back as you want with a loop

for (int i = index - Period; i < index; i++)
            {
                var lastBarBelowEma = MarketSeries.High[i - 1] < ema.Result[i - 1];
                var lastBarBear = MarketSeries.Open[i - 1] > MarketSeries.Close[i - 1];
                var priceActionWithinLastBar = MarketSeries.High[i] < MarketSeries.High[i - 1] &&
                                               MarketSeries.Low[i] > MarketSeries.Low[i - 1];

                if (lastBarBelowEma && lastBarBear && priceActionWithinLastBar)
                {
                    double yValue = MarketSeries.High[i] + Symbol.PipSize*2;

                    ChartObjects.DrawText("objectName", "Yes", i, yValue, VerticalAlignment.Center,
                                          HorizontalAlignment.Center, Colors.Red);
                }

            }

You can do something the equivalent with bars above ema.

Hope it helps.

The cAlgo.API.dll may be referenced within your Vistual Studio solution. It is located in the same folder as the cAlgo.exe file.

See also: /forum/cbot-support/211