[Weekly High And Low] Free =)

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


namespace cAlgo
{
    [Indicator(IsOverlay = true, TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class WeeklyHighAndLow : Indicator
    {
        [Output("Weekly High", LineColor = "Red")]
        public IndicatorDataSeries LastWeeksHigh { get; set; }

        [Output("Weekly Low", LineColor = "Green")]
        public IndicatorDataSeries LastWeeksLow { get; set; }

        [Parameter("Number of Weeks", DefaultValue = 1, MinValue = 1, MaxValue = 2000, Step = 1)]
        public int NumberOfWeeks { get; set; }

        public MarketSeries WeeklyDataseries;

        protected override void Initialize()
        {
            WeeklyDataseries = MarketData.GetSeries(Symbol, TimeFrame.Weekly);
        }

        public override void Calculate(int index)
        {
            LastWeeksLow[index] = WeeklyDataseries.Low.Minimum(NumberOfWeeks);
            LastWeeksHigh[index] = WeeklyDataseries.High.Maximum(NumberOfWeeks);
        }

    }
}