iTrend

/*
The indicator has two lines: bullish (green) and bearish (red).
If the bullish line is above the bearish line the price is 
trending upwards.
If the bearish line is above the bullish line the price is 
trending downwards.

This indicator has been based on this trend indicator 
form MT5:
https://www.mql5.com/es/code/2002

*/
using System;
using cAlgo.API;
using cAlgo.API.Internals;
using cAlgo.API.Indicators;
using cAlgo.Indicators;

namespace cAlgo
{
    [Indicator(IsOverlay = false, TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class iTrend : Indicator
    {
        [Parameter("Price", DefaultValue = PriceType.CLOSE_PRICE)]
        public PriceType ParamPriceType { get; set; }

        [Parameter("Period", DefaultValue = 13, MinValue = 1)]
        public int ParamMAPeriod { get; set; }

        [Output("Bullish line", LineColor = "Lime", PlotType = PlotType.Line, LineStyle = LineStyle.Solid)]
        public IndicatorDataSeries bullishLine { get; set; }

        [Output("Bearish line", LineColor = "Red", PlotType = PlotType.Line, LineStyle = LineStyle.Solid)]
        public IndicatorDataSeries bearishLine { get; set; }

        private MovingAverage ma;

        protected override void Initialize()
        {
            switch (this.ParamPriceType)
            {
                case PriceType.TYPICAL_PRICE:
                    this.ma = Indicators.MovingAverage(Bars.TypicalPrices, this.ParamMAPeriod, MovingAverageType.Exponential);
                    break;
                case PriceType.MEDIAN_PRICE:
                    this.ma = Indicators.MovingAverage(Bars.MedianPrices, this.ParamMAPeriod, MovingAverageType.Exponential);
                    break;
                case PriceType.WEIGHTED_PRICE:
                    this.ma = Indicators.MovingAverage(Bars.WeightedPrices, this.ParamMAPeriod, MovingAverageType.Exponential);
                    break;
                case PriceType.CLOSE_PRICE:
                default:
                    this.ma = Indicators.MovingAverage(Bars.ClosePrices, this.ParamMAPeriod, MovingAverageType.Exponential);
                    break;
            }
        }

        public override void Calculate(int index)
        {
            double price;
            switch (this.ParamPriceType)
            {
                case PriceType.TYPICAL_PRICE:
                    price = Bars.TypicalPrices[index];
                    break;
                case PriceType.MEDIAN_PRICE:
                    price = Bars.MedianPrices[index];
                    break;
                case PriceType.WEIGHTED_PRICE:
                    price = Bars.WeightedPrices[index];
                    break;
                case PriceType.CLOSE_PRICE:
                default:
                    price = Bars.ClosePrices[index];
                    break;
            }

            bullishLine[index] = price - this.ma.Result[index];
            bearishLine[index] = -(Bars.LowPrices[index] + Bars.HighPrices[index] - 2 * this.ma.Result[index]);
        }
    }

    public enum PriceType
    {
        CLOSE_PRICE,
        TYPICAL_PRICE,
        MEDIAN_PRICE,
        WEIGHTED_PRICE
    }
}