# Cumulative Delta

```
//------------------------------------------------------------------------------
//
// Индикатор CumulativeDelta. Copyright (c) 2023 Tiger Trade Capital AG. All rights reserved.
//
//------------------------------------------------------------------------------
 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.Serialization;
using System.Windows;
using System.Windows.Media;
using TigerTrade.Chart.Base;
using TigerTrade.Chart.Base.Enums;
using TigerTrade.Chart.Indicators.Common;
using TigerTrade.Chart.Indicators.Enums;
using TigerTrade.Core.Utils.Time;
using TigerTrade.Dx;
 
namespace TigerTrade.Chart.Indicators.Custom
{
    [DataContract(Name = "CumulativeDeltaIndicator", Namespace = "http://schemas.datacontract.org/2004/07/TigerTrade.Chart.Indicators.Custom")]
    [Indicator("X_CumulativeDelta", "*CumulativeDelta", false, Type = typeof(CumulativeDeltaIndicator))]
    internal sealed class CumulativeDeltaIndicator : IndicatorBase
    {
        private IndicatorPeriodType _period;
     
        [DataMember(Name = "Period")]
        [Category("Параметры"), DisplayName("Период")]
        public IndicatorPeriodType Period
        {
            get => _period;
            set
            {
                if (value == _period)
                {
                    return;
                }
 
                _period = value;
 
                Clear();
 
                OnPropertyChanged();
            }
        }
 
        private IndicatorViewType _type;
     
        [DataMember(Name = "Type")]
        [Category("Параметры"), DisplayName("Тип")]
        public IndicatorViewType Type
        {
            get => _type;
            set
            {
                if (value == _type)
                {
                    return;
                }
 
                _type = value;
             
                OnPropertyChanged();
                OnPropertyChanged(nameof(UpColor));
                OnPropertyChanged(nameof(DownColor));
                OnPropertyChanged(nameof(LineColor));
                OnPropertyChanged(nameof(LineWidth));
            }
        }
 
        private XBrush _upBrush;
 
        private XPen _upPen;
 
        private XColor _upColor;
     
        [DataMember(Name = "UpColor")]
        [Category("Стиль"), DisplayName("Цвет при росте")]
        public XColor UpColor
        {
            get => _upColor;
            set
            {
                if (value == _upColor)
                {
                    return;
                }
 
                _upColor = value;
 
                _upBrush = new XBrush(_upColor);
                _upPen = new XPen(_upBrush, 1);
             
                OnPropertyChanged();
            }
        }
 
        private XBrush _downBrush;
 
        private XPen _downPen;
 
        private XColor _downColor;
     
        [DataMember(Name = "DownColor")]
        [Category("Стиль"), DisplayName("Цвет при падении")]
        public XColor DownColor
        {
            get => _downColor;
            set
            {
                if (value == _downColor)
                {
                    return;
                }
 
                _downColor = value;
 
                _downBrush = new XBrush(_downColor);
                _downPen = new XPen(_downBrush, 1);
 
                OnPropertyChanged();
            }
        }
 
        private XBrush _lineBrush;
 
        private XPen _linePen;
 
        private XColor _lineColor;
 
        [DataMember(Name = "LineColor")]
        [Category("Стиль"), DisplayName("Цвет линии")]
        public XColor LineColor
        {
            get => _lineColor;
            set
            {
                if (value == _lineColor)
                {
                    return;
                }
 
                _lineColor = value;
 
                _lineBrush = new XBrush(_lineColor);
                _linePen = new XPen(_lineBrush, LineWidth);
 
                OnPropertyChanged();
            }
        }
 
        private int _lineWidth;
 
        [DataMember(Name = "LineWidth")]
        [Category("Стиль"), DisplayName("Толщина линии")]
        public int LineWidth
        {
            get => _lineWidth;
            set
            {
                value = Math.Max(1, Math.Min(9, value));
 
                if (value == _lineWidth)
                {
                    return;
                }
 
                _lineWidth = value;
 
                _linePen = new XPen(_lineBrush, _lineWidth);
 
                OnPropertyChanged();
            }
        }
 
        [Browsable(false)]
        public override IndicatorCalculation Calculation => IndicatorCalculation.OnEachTick;
 
        public override bool IntegerValues => true;
 
        private class CumDeltaItem
        {
            public long Open;
            public long High;
            public long Low;
            public long Close;
            public int Seq = -1;
        }
 
        private int _lastFullID;
 
        private List<CumDeltaItem> _items;
        private List<CumDeltaItem> Items => _items ?? (_items = new List<CumDeltaItem>());
 
        private void Clear()
        {
            _lastFullID = 0;
 
            Items.Clear();
        }
 
        public CumulativeDeltaIndicator()
        {
            Period = IndicatorPeriodType.Day;
            Type = IndicatorViewType.Columns;
 
            UpColor = Color.FromArgb(255, 30, 144, 255);
            DownColor = Color.FromArgb(255, 178, 34, 34);
 
            LineColor = Color.FromArgb(255, 30, 144, 255);
            LineWidth = 1;
        }
 
        protected override void Execute()
        {
            if (ClearData)
            {
                Clear();
            }
 
            var timeOffset = TimeHelper.GetSessionOffset(DataProvider.Symbol.Exchange);
 
            for (var i = _lastFullID; i < DataProvider.Count; i++)
            {
                var cluster = DataProvider.GetRawCluster(i);
 
                if (Items.Count < i + 1)
                {
                    Items.Add(new CumDeltaItem());
                }
 
                var item = Items[i];
                var prevItem = Items.Count > 1 ? Items[i - 1] : new CumDeltaItem();
 
                var sequence = 1;
 
                switch (Period)
                {
                    case IndicatorPeriodType.Day:
 
                        sequence = DataProvider.Period.GetSequence(ChartPeriodType.Day, 1, cluster.Time, timeOffset);
 
                        break;
 
                    case IndicatorPeriodType.Week:
 
                        sequence = DataProvider.Period.GetSequence(ChartPeriodType.Week, 1, cluster.Time, timeOffset);
 
                        break;
 
                    case IndicatorPeriodType.Month:
 
                        sequence = DataProvider.Period.GetSequence(ChartPeriodType.Month, 1, cluster.Time, timeOffset);
 
                        break;
                }
 
                var cumDeltaValue = 0L;
 
                if (sequence == prevItem.Seq)
                {
                    cumDeltaValue = prevItem.Close;
                }
 
                item.Seq = sequence;
 
                item.Open = cumDeltaValue;
 
                cumDeltaValue += cluster.Delta;
 
                item.Close = cumDeltaValue;
 
                item.High = cumDeltaValue + (cluster.DeltaHigh - cluster.Delta);
                item.Low = cumDeltaValue + (cluster.DeltaLow - cluster.Delta);
            }
 
            _lastFullID = Math.Max(DataProvider.Count - 2, 0);
        }
 
        public override bool GetMinMax(out double min, out double max)
        {
            min = double.MaxValue;
            max = double.MinValue;
 
            if (Items.Count == 0)
            {
                return false;
            }
 
            var longMin = long.MaxValue;
            var longMax = long.MinValue;
 
            if (Type == IndicatorViewType.Candles)
            {
                for (var i = 0; i < Canvas.Count; i++)
                {
                    var index = Canvas.GetIndex(i);
 
                    if (index < 0 || index >= Items.Count)
                    {
                        continue;
                    }
 
                    var item = Items[index];
 
                    if (longMin > item.Low)
                    {
                        longMin = item.Low;
                    }
 
                    if (longMax < item.High)
                    {
                        longMax = item.High;
                    }
                }
            }
            else
            {
                for (var i = 0; i < Canvas.Count; i++)
                {
                    var index = Canvas.GetIndex(i);
 
                    if (index < 0 || index >= Items.Count)
                    {
                        continue;
                    }
 
                    var item = Items[index];
 
                    if (longMin > item.Close)
                    {
                        longMin = item.Close;
                    }
 
                    if (longMax < item.Close)
                    {
                        longMax = item.Close;
                    }
                }
            }
 
            if (longMin > longMax)
            {
                return false;
            }
 
            min = (double) DataProvider.Symbol.GetSize(longMin);
            max = (double) DataProvider.Symbol.GetSize(longMax);
 
            return true;
        }
 
        public override void Render(DxVisualQueue visual)
        {
            var symbol = DataProvider.Symbol;
 
            switch (Type)
            {
                case IndicatorViewType.Candles:
                    {
                        var width = (int)(Canvas.ColumnWidth * Canvas.ColumnPercent + 0.4);
                        var halfWith = Math.Max((int)(width / 2.0), 1.0);
 
                        for (var i = 0; i < Canvas.Count; i++)
                        {
                            var index = Canvas.GetIndex(i);
 
                            if (index < 0 || index >= Items.Count)
                            {
                                continue;
                            }
 
                            var item = Items[index];
 
                            var isUp = item.Close > item.Open;
 
                            var centerX = (int)Canvas.GetX(index);
                            var openY = (int)GetY(symbol.GetSize(item.Open));
                            var highY = (int)GetY(symbol.GetSize(item.High));
                            var lowY = (int)GetY(symbol.GetSize(item.Low));
                            var closeY = (int)GetY(symbol.GetSize(item.Close));
 
                            var topY = Math.Min(openY, closeY);
                            var bottomY = Math.Max(openY, closeY);
 
                            var height = bottomY - topY;
 
                            var backBrush = isUp ? _upBrush : _downBrush;
                            var backPen = isUp ? _upPen : _downPen;
 
                            if (height == 0 || width <= 1)
                            {
                                if (highY == lowY)
                                {
                                    lowY++;
                                }
 
                                visual.DrawLine(backPen,
                                    new Point(centerX, highY),
                                    new Point(centerX, lowY));
                            }
                            else
                            {
                                visual.DrawLine(backPen,
                                    new Point(centerX, highY),
                                    new Point(centerX, topY));
 
                                visual.DrawLine(backPen,
                                    new Point(centerX, bottomY),
                                    new Point(centerX, lowY));
                            }
 
                            if (width > 1)
                            {
                                if (height == 0)
                                {
                                    visual.DrawLine(backPen,
                                        new Point(centerX - halfWith, topY),
                                        new Point(centerX + halfWith + 1, topY));
                                }
                                else
                                {
                                    visual.FillRectangle(backBrush,
                                        new Rect(centerX - halfWith, topY, halfWith * 2 + 1, height));
                                }
                            }
                        }
                    }
                    break;
 
                case IndicatorViewType.Columns:
                    {
                        var zeroPoint = GetY(0.0);
 
                        var width = Math.Max(Canvas.ColumnWidth - 1, 1);
 
                        for (var i = 0; i < Canvas.Count; i++)
                        {
                            var index = Canvas.GetIndex(i);
 
                            if (index < 0 || index >= Items.Count)
                            {
                                continue;
                            }
 
                            var item = Items[index];
 
                            var x = Canvas.GetX(index);
                            var y = GetY(symbol.GetSize(item.Open));
                            var h = (int)zeroPoint - (int)y;
 
                            var isUp = h > 0;
 
                            if (h < 0.0)
                            {
                                y += h;
                                h = -h;
                            }
 
                            h = Math.Max(1, h);
 
                            if (width > 1.0)
                            {
                                var rect = new Rect(x - width / 2.0, y, width, h);
 
                                visual.FillRectangle(isUp ? _upBrush : _downBrush, rect);
                            }
                            else
                            {
                                visual.DrawLine(isUp ? _upPen : _downPen, x, y, x, y + h);
                            }
                        }
                    }
                    break;
 
                case IndicatorViewType.Line:
                    {
                        if (Items.Count < 2)
                        {
                            return;
                        }
 
                        var points = new Point[Canvas.Count];
 
                        for (var i = 0; i < Canvas.Count; i++)
                        {
                            var index = Canvas.GetIndex(i);
 
                            if (index < 0 || index >= Items.Count)
                            {
                                continue;
                            }
 
                            var item = Items[index];
 
                            var x = Canvas.GetX(index);
                            var y = GetY(symbol.GetSize(item.Open));
 
                            points[i] = new Point(x, y);
                        }
 
                        visual.DrawLines(_linePen, points);
                    }
                    break;
            }
        }
 
        public override List<IndicatorValueInfo> GetValues(int cursorPos)
        {
            var info = new List<IndicatorValueInfo>();
 
            if (cursorPos >= 0 && cursorPos < Items.Count)
            {
                var s = Canvas.FormatValue((double)DataProvider.Symbol.GetSize(Items[cursorPos].Close));
 
                info.Add(new IndicatorValueInfo(s,
                    Type == IndicatorViewType.Line ? _lineBrush : Canvas.Theme.ChartFontBrush));
            }
 
            return info;
        }
 
        public override void GetLabels(ref List<IndicatorLabelInfo> labels)
        {
            if (Items.Count == 0)
            {
                return;
            }
 
            if (DataProvider.Count <= Canvas.Start)
            {
                return;
            }
 
            var index = DataProvider.Count - 1 - Canvas.Start;
 
            if (index < 0 && index >= Items.Count)
            {
                return;
            }
 
            var item = Items[index];
 
            var lastValue = (double)DataProvider.Symbol.GetSize(item.Close);
 
            if (Type == IndicatorViewType.Line)
            {
                labels.Add(new IndicatorLabelInfo(lastValue, _lineColor));
 
                return;
            }
 
            var isUp = false;
 
            switch (Type)
            {
                case IndicatorViewType.Line:
                case IndicatorViewType.Columns:
 
                    isUp = !double.IsNaN(lastValue) && lastValue > 0;
 
                    break;
 
                case IndicatorViewType.Candles:
 
                    isUp = !double.IsNaN(lastValue) && item.Close > item.Open;
 
                    break;
            }
 
            labels.Add(new IndicatorLabelInfo(lastValue, isUp ? UpColor : DownColor));
        }
 
        public override void ApplyColors(IChartTheme theme)
        {
            UpColor = theme.PaletteColor6;
            DownColor = theme.PaletteColor7;
 
            LineColor = theme.GetNextColor();
 
            base.ApplyColors(theme);
        }
 
        public override void CopyTemplate(IndicatorBase indicator, bool style)
        {
            var i = (CumulativeDeltaIndicator)indicator;
 
            Period = i.Period;
            Type = i.Type;
 
            UpColor = i.UpColor;
            DownColor = i.DownColor;
 
            LineColor = i.LineColor;
            LineWidth = i.LineWidth;
 
            base.CopyTemplate(indicator, style);
        }
 
        public override string ToString()
        {
            return $"{Name} ({Period})";
        }
 
        public override bool GetPropertyVisibility(string propertyName)
        {
            switch (propertyName)
            {
                case "LineWidth":
                case "LineColor":
 
                    return Type == IndicatorViewType.Line;
 
                case "UpColor":
                case "DownColor":
 
                    return Type != IndicatorViewType.Line;
            }
 
            return true;
        }
    }
}
```
