Custom TimeFrame Candlesticks

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 CustomTFCandlesticks : Indicator
    {
        [Parameter()]
        public TimeFrame Timeframe { get; set; }

        [Parameter("Thickness", DefaultValue = 1)]
        public double Thickness { get; set; }

        private MarketSeries tf;

        protected override void Initialize()
        {
            tf = MarketData.GetSeries(Timeframe);
        }

        public override void Calculate(int index)
        {
            int idx1 = tf.OpenTime.GetIndexByTime(MarketSeries.OpenTime[index]);
            int idx2 = MarketSeries.OpenTime.GetIndexByTime(tf.OpenTime[idx1]);
            int idx3 = idx2 + (index - idx2) / 2;

            double open = tf.Open[idx1];
            double high = tf.High[idx1];
            double low = tf.Low[idx1];
            double close = tf.Close[idx1];

            var color = open < close ? Colors.Green : Colors.Red;

            ChartObjects.DrawLine("top" + idx1, idx2, close, index, close, color, Thickness);
            ChartObjects.DrawLine("bottom" + idx1, idx2, open, index, open, color, Thickness);
            ChartObjects.DrawLine("left" + idx1, idx2, open, idx2, close, color, Thickness);
            ChartObjects.DrawLine("right" + idx1, index, open, index, close, color, Thickness);

            ChartObjects.DrawLine("high" + idx1, idx3, high, idx3, Math.Max(open, close), color, Thickness);
            ChartObjects.DrawLine("low" + idx1, idx3, low, idx3, Math.Min(open, close), color, Thickness);

        }
    }
}