Fibonacci Extensions

 
//------------------------------------------------------------------------------
//
// Графический объект FibonacciExtensions. 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.Objects.Common;
using TigerTrade.Chart.Objects.Enums;
using TigerTrade.Dx;
using TigerTrade.Dx.Enums;
 
namespace TigerTrade.Chart.Objects.Custom
{
    [DataContract(Name = "FibonacciExtensionsObject", Namespace = "http://schemas.datacontract.org/2004/07/TigerTrade.Chart.Objects.Custom")]
    [ChartObject("X_FibonacciExtensions", "Fibonacci Extensions", 3, Type = typeof(FibonacciExtensionsObject))]
    public sealed class FibonacciExtensionsObject : ObjectBase
    {
        [Browsable(false)]
        private XBrush LineBrush { get; set; }
 
        [Browsable(false)]
        public XPen LinePen { get; private set; }
 
        private XColor _lineColor;
 
        [DataMember(Name = "LineColor")]
        [Category("Линия"), DisplayName("Цвет линии")]
        public XColor LineColor
        {
            get => _lineColor;
            set
            {
                if (value == _lineColor)
                {
                    return;
                }
 
                _lineColor = value;
 
                LineBrush = new XBrush(_lineColor);
                LinePen = new XPen(LineBrush, LineWidth, LineStyle);
 
                OnPropertyChanged();
            }
        }
 
        private int _lineWidth;
 
        [DataMember(Name = "LineWidth")]
        [Category("Линия"), DisplayName("Толщина линии")]
        public int LineWidth
        {
            get => _lineWidth;
            set
            {
                value = Math.Max(1, Math.Min(10, value));
 
                if (value == _lineWidth)
                {
                    return;
                }
 
                _lineWidth = value;
 
                LinePen = new XPen(LineBrush, _lineWidth, LineStyle);
 
                OnPropertyChanged();
            }
        }
 
        private XDashStyle _lineStyle;
 
        [DataMember(Name = "LineStyle")]
        [Category("Линия"), DisplayName("Стиль линии")]
        public XDashStyle LineStyle
        {
            get => _lineStyle;
            set
            {
                if (value == _lineStyle)
                {
                    return;
                }
 
                _lineStyle = value;
 
                LinePen = new XPen(LineBrush, LineWidth, _lineStyle);
 
                OnPropertyChanged();
            }
        }
 
        private bool _openStart;
 
        [DataMember(Name = "OpenStart")]
        [Category("Уровни"), DisplayName("Продлить влево")]
        public bool OpenStart
        {
            get => _openStart;
            set
            {
                if (value == _openStart)
                {
                    return;
                }
 
                _openStart = value;
 
                OnPropertyChanged();
            }
        }
 
        private bool _openEnd;
 
        [DataMember(Name = "OpenEnd")]
        [Category("Уровни"), DisplayName("Продлить вправо")]
        public bool OpenEnd
        {
            get => _openEnd;
            set
            {
                if (value == _openEnd)
                {
                    return;
                }
 
                _openEnd = value;
 
                OnPropertyChanged();
            }
        }
 
        [Browsable(false)]
        private XBrush LevelsLineBrush { get; set; }
 
        [Browsable(false)]
        private XPen LevelsLinePen { get; set; }
 
        private XColor _levelsLineColor;
 
        [DataMember(Name = "LevelsLineColor")]
        [Category("Уровни"), DisplayName("Цвет линии")]
        public XColor LevelsLineColor
        {
            get => _levelsLineColor;
            set
            {
                if (value == _levelsLineColor)
                {
                    return;
                }
 
                _levelsLineColor = value;
 
                LevelsLineBrush = new XBrush(_levelsLineColor);
                LevelsLinePen = new XPen(LevelsLineBrush, LevelsLineWidth, LineStyle);
 
                OnPropertyChanged();
            }
        }
 
        private int _levelsLineWidth;
 
        [DataMember(Name = "LevelsLineWidth")]
        [Category("Уровни"), DisplayName("Толщина линии")]
        public int LevelsLineWidth
        {
            get => _levelsLineWidth;
            set
            {
                value = Math.Max(1, Math.Min(10, value));
 
                if (value == _levelsLineWidth)
                {
                    return;
                }
 
                _levelsLineWidth = value;
 
                LevelsLinePen = new XPen(LevelsLineBrush, _levelsLineWidth, LineStyle);
 
                OnPropertyChanged();
            }
        }
 
        private XDashStyle _levelsLineStyle;
 
        [DataMember(Name = "LevelsLineStyle")]
        [Category("Уровни"), DisplayName("Стиль линии")]
        public XDashStyle LevelsLineStyle
        {
            get => _levelsLineStyle;
            set
            {
                if (value == _lineStyle)
                {
                    return;
                }
 
                _levelsLineStyle = value;
 
                LevelsLinePen = new XPen(LevelsLineBrush, LevelsLineWidth, _lineStyle);
 
                OnPropertyChanged();
            }
        }
 
        private int _levelsWidth;
 
        [DataMember(Name = "LevelsWidth")]
        [Category("Уровни"), DisplayName("Ширина уровня")]
        public int LevelsWidth
        {
            get => _levelsWidth;
            set
            {
                value = Math.Max(20, Math.Min(500, value));
 
                if (value == _levelsWidth)
                {
                    return;
                }
 
                _levelsWidth = value;
 
                OnPropertyChanged();
            }
        }
 
        private ObjectTextAlignment _textAlignment;
 
        [DataMember(Name = "TextAlignment")]
        [Category("Уровни"), DisplayName("Текст")]
        public ObjectTextAlignment TextAlignment
        {
            get => _textAlignment;
            set
            {
                if (value == _textAlignment)
                {
                    return;
                }
 
                _textAlignment = value;
 
                OnPropertyChanged();
            }
        }
 
        private bool _customLevels;
 
        [DataMember(Name = "CustomLevels")]
        [Category("Свои уровни"), DisplayName("Включить")]
        public bool CustomLevels
        {
            get => _customLevels;
            set
            {
                if (value == _customLevels)
                {
                    return;
                }
 
                _customLevels = value;
 
                OnPropertyChanged();
            }
        }
 
        private List<ObjectLine> _lines;
 
        [DataMember(Name = "Levels")]
        [Category("Свои уровни"), DisplayName("Уровни")]
        public List<ObjectLine> Levels
        {
            get => _lines ?? (_lines = new List<ObjectLine>());
            set
            {
                if (Equals(value, _lines))
                {
                    return;
                }
 
                _lines = value;
 
                OnPropertyChanged();
            }
        }
 
        private Point[] _startPoints;
        private Point[] _endPoints;
 
        private double[] _split;
 
        protected override int PenWidth => LineWidth;
 
        public FibonacciExtensionsObject()
        {
            LineColor = Colors.Black;
            LineWidth = 1;
            LineStyle = XDashStyle.Solid;
 
            OpenStart = false;
            OpenEnd = false;
 
            LevelsLineColor = Colors.Black;
            LevelsLineWidth = 1;
            LevelsLineStyle = XDashStyle.Solid;
 
            LevelsWidth = 200;
 
            TextAlignment = ObjectTextAlignment.LeftBottom;
 
            CustomLevels = false;
 
            Levels = new List<ObjectLine>
            {
                new ObjectLine(0.0, Colors.Black),
                new ObjectLine(23.6, Colors.Black),
                new ObjectLine(38.2, Colors.Black),
                new ObjectLine(50.0, Colors.Black),
                new ObjectLine(61.8, Colors.Black),
                new ObjectLine(78.6, Colors.Black),
                new ObjectLine(100.0, Colors.Black),
                new ObjectLine(161.8, Colors.Black),
                new ObjectLine(261.8, Colors.Black),
                new ObjectLine(361.8, Colors.Black),
                new ObjectLine(423.6, Colors.Black)
            };
        }
 
        protected override void Draw(DxVisualQueue visual, ref List<ObjectLabelInfo> labels)
        {
            CalcPoint();
 
            if (_startPoints == null || _endPoints == null)
            {
                return;
            }
 
            var points = ToPoints(ControlPoints);
 
            visual.DrawLines(LinePen, points);
 
            if (InSetup)
            {
                if (ControlPoints[0].X == ControlPoints[2].X && ControlPoints[0].Y == ControlPoints[2].Y)
                {
                    return;
                }
            }
 
            for (var i = 0; i < _startPoints.Length; i++)
            {
                if (CustomLevels)
                {
                    var level = Levels[i];
 
                    if (!level.ShowLine)
                    {
                        continue;
                    }
 
                    visual.DrawLine(level.LinePen, _startPoints[i], _endPoints[i]);
 
                    if (TextAlignment != ObjectTextAlignment.Hide)
                    {
                        visual.DrawString(GetStr(i), Canvas.ChartFont, level.LineBrush, GetRect(i, level.LineWidth));
                    }
                }
                else
                {
                    visual.DrawLine(LevelsLinePen, _startPoints[i], _endPoints[i]);
 
                    if (TextAlignment != ObjectTextAlignment.Hide)
                    {
                        visual.DrawString(GetStr(i), Canvas.ChartFont, LevelsLineBrush, GetRect(i, LineWidth));
                    }
                }
            }
        }
 
        private string GetStr(int i)
        {
            var p = DataProvider.Symbol.FormatPrice((decimal)GetPrice(i), true);
 
            return $"{_split[i]:P2} ({p})";
        }
 
        private Rect GetRect(int i, int lineWidth)
        {
            var textSize = Canvas.ChartFont.GetSize(GetStr(i));
 
            var x = 0.0;
            var y = 0.0;
 
            var width = textSize.Width;
 
            switch (TextAlignment)
            {
                case ObjectTextAlignment.LeftTop:
                case ObjectTextAlignment.CenterTop:
                case ObjectTextAlignment.RightTop:
 
                    y = _startPoints[i].Y - 4 - Math.Ceiling(lineWidth / 2.0) - textSize.Height;
 
                    break;
 
                case ObjectTextAlignment.LeftMiddle:
                case ObjectTextAlignment.CenterMiddle:
                case ObjectTextAlignment.RightMiddle:
 
                    y = _startPoints[i].Y - 4 - Math.Ceiling(lineWidth / 2.0);
 
                    break;
 
                case ObjectTextAlignment.LeftBottom:
                case ObjectTextAlignment.CenterBottom:
                case ObjectTextAlignment.RightBottom:
 
                    y = _startPoints[i].Y + 4 + Math.Ceiling(lineWidth / 2.0);
 
                    break;
            }
 
            switch (TextAlignment)
            {
                case ObjectTextAlignment.LeftTop:
                case ObjectTextAlignment.LeftMiddle:
                case ObjectTextAlignment.LeftBottom:
 
                    x = Math.Min(_startPoints[i].X, _endPoints[i].X) + 4;
 
                    break;
 
                case ObjectTextAlignment.CenterTop:
                case ObjectTextAlignment.CenterMiddle:
                case ObjectTextAlignment.CenterBottom:
 
                    x = (_startPoints[i].X + _endPoints[i].X - width) / 2.0;
 
                    break;
 
                case ObjectTextAlignment.RightTop:
                case ObjectTextAlignment.RightMiddle:
                case ObjectTextAlignment.RightBottom:
 
                    x = Math.Max(_startPoints[i].X, _endPoints[i].X) - width - 4;
 
                    break;
            }
 
            return new Rect(x, y, width, textSize.Height);
        }
 
        private void CalcPoint()
        {
            if (CustomLevels)
            {
                _split = new double[Levels.Count];
 
                for (var i = 0; i < Levels.Count; i++)
                {
                    _split[i] = Levels[i].Value / 100.0;
                }
            }
            else
            {
                _split = new[] { 0.0, 0.236, 0.382, 0.5, 0.618, 0.786, 1.0, 1.618, 2.618, 3.618, 4.236 };
            }
 
            var p = ToPoint(ControlPoints[2]);
 
            _startPoints = new Point[_split.Length];
            _endPoints = new Point[_split.Length];
 
            var op = new ObjectPoint(ControlPoints[2].X, 0.0);
 
            for (var i = 0; i < _split.Length; i++)
            {
                op.Y = GetPrice(i);
 
                var p3 = ToPoint(op);
 
                _startPoints[i] = new Point(p.X, p3.Y);
                _endPoints[i] = new Point(p.X + LevelsWidth, p3.Y);
            }
 
            for (var i = 0; i < _startPoints.Length; i++)
            {
                if (_startPoints[i].X <= _endPoints[i].X)
                {
                    if (OpenStart)
                    {
                        _startPoints[i].X = 0;
                    }
 
                    if (OpenEnd)
                    {
                        _endPoints[i].X = Canvas.Rect.Right;
                    }
                }
                else
                {
                    if (OpenStart)
                    {
                        _endPoints[i].X = 0;
                    }
 
                    if (OpenEnd)
                    {
                        _startPoints[i].X = Canvas.Rect.Right;
                    }
                }
            }
        }
 
        private double GetPrice(int lineIndex)
        {
            return (ControlPoints[1].Y - ControlPoints[0].Y) * _split[lineIndex] +
                   ControlPoints[2].Y;
        }
 
        protected override bool InObject(int x, int y)
        {
            if (_startPoints == null || _endPoints == null || _startPoints.Length != Levels.Count)
            {
                return false;
            }
 
            for (var i = 0; i < _startPoints.Length; i++)
            {
                if (_startPoints[i] == new Point() || (CustomLevels && !Levels[i].ShowLine))
                {
                    continue;
                }
 
                var result = InLineSegment(x, y, _startPoints[i], _endPoints[i], PenWidth + 2);
 
                if (result)
                {
                    return true;
                }
            }
 
            var points = ToPoints(ControlPoints);
 
            for (var i = 0; i < points.Length - 1; i++)
            {
                if (InLineSegment(x, y, points[i], points[i + 1], LineWidth + 2))
                {
                    return true;
                }
            }
 
            return false;
        }
 
        private static bool InLineSegment(int x, int y, Point p1, Point p2, int width)
        {
            var n1 = Math.Max(p1.X, p2.X);
            var n2 = Math.Min(p1.X, p2.X);
            var n3 = Math.Max(p1.Y, p2.Y);
            var n4 = Math.Min(p1.Y, p2.Y);
 
            return (Math.Abs(Dist(x, y, p1, p2)) <= width) && (x <= n1 + width) && (x >= n2 - width) &&
                   (y <= n3 + width) && (y >= n4 - width);
        }
 
        private static double Dist(int x, int y, Point p1, Point p2)
        {
            var d1 = p1.X - p2.X;
            var d2 = p1.Y - p2.Y;
 
            return ((x - p1.X) * (p2.Y - p1.Y) - (p2.X - p1.X) * (y - p1.Y)) / Math.Sqrt(d1 * d1 + d2 * d2);
        }
 
        public override void ApplyTheme(IChartTheme theme)
        {
            base.ApplyTheme(theme);
 
            LevelsLineColor = theme.ChartObjectLineColor;
            LineColor = theme.ChartObjectLineColor;
 
            foreach (var level in Levels)
            {
                level.LineColor = theme.ChartObjectLineColor;
            }
        }
 
        public override void CopyTemplate(ObjectBase objectBase, bool style)
        {
            if (objectBase is FibonacciExtensionsObject obj)
            {
                LineColor = obj.LineColor;
                LineWidth = obj.LineWidth;
                LineStyle = obj.LineStyle;
 
                OpenStart = obj.OpenStart;
                OpenEnd = obj.OpenEnd;
 
                LevelsLineColor = obj.LevelsLineColor;
                LevelsLineStyle = obj.LevelsLineStyle;
                LevelsLineWidth = obj.LevelsLineWidth;
 
                LevelsWidth = obj.LevelsWidth;
 
                TextAlignment = obj.TextAlignment;
 
                CustomLevels = obj.CustomLevels;
 
                Levels = new List<ObjectLine>();
 
                foreach (var level in obj.Levels)
                {
                    Levels.Add(new ObjectLine(level));
                }
 
                OnPropertyChanged(nameof(Levels));
            }
 
            base.CopyTemplate(objectBase, style);
        }
    }
}