Horizontal Line

//------------------------------------------------------------------------------
//
// Графический объект HorizontalLine. 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.Alerts;
using TigerTrade.Chart.Base;
using TigerTrade.Chart.Base.Enums;
using TigerTrade.Chart.Indicators.Common;
using TigerTrade.Chart.Objects.Common;
using TigerTrade.Chart.Objects.Enums;
using TigerTrade.Core.Utils.Logging;
using TigerTrade.Dx;
using TigerTrade.Dx.Enums;
 
namespace TigerTrade.Chart.Objects.Custom
{
    [DataContract(Name = "HorizontalLineObject", Namespace = "http://schemas.datacontract.org/2004/07/TigerTrade.Chart.Objects.Custom")]
    [ChartObject("X_HorizontalLine", "Горизонтальная линия", 1, Type = typeof(HorizontalLineObject))]
    public class HorizontalLineObject : ObjectBase
    {
        [Category("Цена"), DisplayName("Цена")]
        public decimal Price
        {
            get => (decimal)ControlPoints[0].Y;
            set
            {
                if (value == (decimal)ControlPoints[0].Y)
                {
                    return;
                }
 
                ControlPoints[0].Y = (double)value;
 
                OnPropertyChanged();
                OnPropertyChanged(nameof(ControlPoints));
            }
        }
 
        private ChartAlertSettings _alert;
 
        [DataMember(Name = "Alert")]
        [Category("Оповещение"), DisplayName("Оповещение")]
        public ChartAlertSettings Alert
        {
            get => _alert ?? (_alert = new ChartAlertSettings());
            set
            {
                if (Equals(value, _alert))
                {
                    return;
                }
 
                _alert = value;
 
                OnPropertyChanged();
            }
        }
 
        private int _alertMinDistance;
 
        [DataMember(Name = "AlertMinDistance")]
        [Category("Оповещение"), DisplayName("Мин. расстояние")]
        public int AlertMinDistance
        {
            get => _alertMinDistance;
            set
            {
                if (value == _alertMinDistance)
                {
                    return;
                }
 
                _alertMinDistance = value;
 
                OnPropertyChanged();
            }
        }
 
        private string _text;
 
        [DataMember(Name = "Text")]
        [Category("Текст"), DisplayName("Текст")]
        public string Text
        {
            get => _text;
            set
            {
                if (value == _text)
                {
                    return;
                }
 
                _text = value;
 
                OnPropertyChanged();
            }
        }
 
        private ObjectTextAlignment _textAlignment;
 
        [DataMember(Name = "TextAlignment")]
        [Category("Текст"), DisplayName("Расположение")]
        public ObjectTextAlignment TextAlignment
        {
            get => _textAlignment;
            set
            {
                if (value == _textAlignment)
                {
                    return;
                }
 
                _textAlignment = value;
 
                OnPropertyChanged();
            }
        }
 
        private int _fontSize;
 
        [DataMember(Name = "FontSize")]
        [Category("Текст"), DisplayName("Размер")]
        public int FontSize
        {
            get => _fontSize;
            set
            {
                value = Math.Max(10, Math.Min(100, value));
 
                if (value == _fontSize)
                {
                    return;
                }
 
                _fontSize = value;
 
                OnPropertyChanged();
            }
        }
 
        private XBrush _lineBrush;
 
        private XPen _linePen;
 
        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();
            }
        }
 
        protected override int PenWidth => LineWidth;
 
        private Rect _lineRect;
 
        public HorizontalLineObject()
        {
            AlertMinDistance = 3;
 
            Text = "";
            TextAlignment = ObjectTextAlignment.RightTop;
 
            FontSize = 14;
 
            LineColor = Colors.Black;
            LineWidth = 1;
            LineStyle = XDashStyle.Solid;
        }
 
        protected override void Draw(DxVisualQueue visual, ref List<ObjectLabelInfo> labels)
        {
            if (Canvas == null)
            {
                return;
            }
 
            var point = ToPoint(ControlPoints[0]);
 
            var startPoint = new Point(Canvas.Rect.Left, point.Y);
            var endPoint = new Point(Canvas.Rect.Right, point.Y);
 
            _lineRect = new Rect(startPoint, endPoint);
 
            if (Settings.TransformHorLines && Canvas.IsStock &&
                Canvas.StockType == ChartStockType.Clusters)
            {
                var y = ControlPoints[0].Y;
 
                var step = DataProvider.Step;
 
                var price = (long)Math.Round(y / step);
 
                var y1 = GetY((price + .5) * step);
                var y2 = GetY((price - .5) * step);
 
                if (y2 - y1 > LineWidth + 2)
                {
                    var brush = new XBrush(LineColor, LineColor.Alpha > 127 ? 127 : LineColor.Alpha);
 
                    _lineRect = new Rect(new Point(startPoint.X, y1), new Point(endPoint.X, y2));
 
                    visual.FillRectangle(brush, _lineRect);
 
                    DrawText(visual);
 
                    labels.Add(new ObjectLabelInfo(price * step, y1, y2, LineColor));
 
                    return;
                }
            }
 
            visual.DrawLine(_linePen, startPoint, endPoint);
 
            DrawText(visual);
 
            labels.Add(new ObjectLabelInfo(ControlPoints[0].Y, LineColor));
        }
 
        protected void DrawText(DxVisualQueue visual)
        {
            if (string.IsNullOrEmpty(Text) || TextAlignment == ObjectTextAlignment.Hide)
            {
                return;
            }
 
            var font = new XFont(Canvas.ChartFont.Name, FontSize);
 
            var textSize = font.GetSize(Text);
 
            var x = 0.0;
            var y = 0.0;
 
            var width = textSize.Width;
 
            switch (TextAlignment)
            {
                case ObjectTextAlignment.LeftTop:
                case ObjectTextAlignment.CenterTop:
                case ObjectTextAlignment.RightTop:
 
                    y = _lineRect.Top - 4 - textSize.Height;
 
                    break;
 
                case ObjectTextAlignment.LeftMiddle:
                case ObjectTextAlignment.CenterMiddle:
                case ObjectTextAlignment.RightMiddle:
 
                    y = (_lineRect.Top + _lineRect.Bottom - textSize.Height) / 2.0;
 
                    break;
 
                case ObjectTextAlignment.LeftBottom:
                case ObjectTextAlignment.CenterBottom:
                case ObjectTextAlignment.RightBottom:
 
                    y = _lineRect.Bottom + 4;
 
                    break;
            }
 
            switch (TextAlignment)
            {
                case ObjectTextAlignment.LeftTop:
                case ObjectTextAlignment.LeftMiddle:
                case ObjectTextAlignment.LeftBottom:
 
                    x = _lineRect.X;
 
                    break;
 
                case ObjectTextAlignment.CenterTop:
                case ObjectTextAlignment.CenterMiddle:
                case ObjectTextAlignment.CenterBottom:
 
                    x = _lineRect.Right - (_lineRect.Width + width) / 2.0;
 
                    x = Math.Max(x, _lineRect.Left);
 
                    break;
 
                case ObjectTextAlignment.RightTop:
                case ObjectTextAlignment.RightMiddle:
                case ObjectTextAlignment.RightBottom:
 
                    x = _lineRect.Right - width;
 
                    x = Math.Max(x, _lineRect.Left);
 
                    break;
            }
 
            var rect = new Rect(x, y, width, textSize.Height);
 
            visual.DrawString(Text, font, _lineBrush, rect);
        }
 
        public override void DrawControlPoints(DxVisualQueue visual)
        {
            if (_lineRect == Rect.Empty)
            {
                return;
            }
 
            var width = LineWidth / 2 + 4;
 
            var center = new Point((_lineRect.Left + _lineRect.Right) / 2.0, (_lineRect.Top + _lineRect.Bottom) / 2.0);
 
            var rect = new Rect(center, center);
 
            rect.Inflate(new Size(width, width));
 
            visual.FillRectangle(Theme.ChartCpFillBrush, rect);
            visual.DrawRectangle(Theme.ChartCpLinePen, rect);
        }
 
        protected override bool InObject(int x, int y)
        {
            if (_lineRect == Rect.Empty)
            {
                return false;
            }
 
            var r = Rect.Inflate(_lineRect, new Size(0, 2));
 
            return r.Contains(x, y);
        }
 
        protected override bool IsObjectOnChart()
        {
            return true;
        }
 
        public override void ApplyTheme(IChartTheme theme)
        {
            base.ApplyTheme(theme);
 
            LineColor = theme.ChartObjectLineColor;
        }
 
        public override void CopyTemplate(ObjectBase objectBase, bool style)
        {
            if (objectBase is HorizontalLineObject obj)
            {
                Alert.Copy(obj.Alert, !style);
 
                OnPropertyChanged(nameof(Alert));
 
                AlertMinDistance = obj.AlertMinDistance;
 
                Text = obj.Text;
                TextAlignment = obj.TextAlignment;
 
                FontSize = obj.FontSize;
 
                LineColor = obj.LineColor;
                LineWidth = obj.LineWidth;
                LineStyle = obj.LineStyle;
            }
 
            base.CopyTemplate(objectBase, style);
        }
 
        private double _lastAlertValue;
        private int _lastAlertIndex;
 
        public override void CheckAlert(List<IndicatorBase> indicators)
        {
            if (!Alert.IsActive)
            {
                return;
            }
 
            try
            {
                foreach (var indicator in indicators)
                {
                    if (indicator.CheckAlert(ControlPoints[0].Y, AlertMinDistance, ref _lastAlertIndex,
                        ref _lastAlertValue))
                    {
                        var message =
                            $"{indicator.Name}: пересечение уровня {DataProvider.Symbol.FormatPrice((decimal) ControlPoints[0].Y)}.";
 
                        AddAlert(Alert, message);
                    }
                }
            }
            catch (Exception e)
            {
                LogManager.WriteError(e);
            }
        }
    }
}