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‎EquityLine.cs‎

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// -------------------------------------------------------------------------------
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// Displays projected equity at a draggable price line.
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// Takes into account P&L of open trades in the current symbol.
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// You can hide/show the line by pressing Shift+E.
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//
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// Version 1.00
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// Copyright 2025, EarnForex.com
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// https://www.earnforex.com/indicators/Entry-Line/
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// -------------------------------------------------------------------------------
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using System;
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using System.Linq;
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using cAlgo.API;
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using cAlgo.API.Internals;
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namespace cAlgo
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{
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[Indicator(IsOverlay = true, TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
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public class EquityProjectionLine : Indicator
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{
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[Parameter("Update Frequency (seconds)", DefaultValue = 1, MinValue = 1)]
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public int UpdateFrequency { get; set; }
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[Parameter("Projection Line Color", DefaultValue = "DodgerBlue")]
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public Color LineColor { get; set; }
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[Parameter("Projection Line Width", DefaultValue = 2, MinValue = 1)]
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public int LineWidth { get; set; }
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[Parameter("Projection Line Style", DefaultValue = LineStyle.Solid)]
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public LineStyle LineStyleParam { get; set; }
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[Parameter("Show Equity Label", DefaultValue = true)]
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public bool ShowLabel { get; set; }
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[Parameter("Equity Label Prefix", DefaultValue = "EQUITY: ")]
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public string EquityLabelPrefix { get; set; }
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[Parameter("Label PositiveChange Color", DefaultValue = "Green")]
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public Color LabelPositiveChangeColor { get; set; }
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[Parameter("Label Negative Change Color", DefaultValue = "Red")]
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public Color LabelNegativeChangeColor { get; set; }
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[Parameter("Initial Price Offset (pips)", DefaultValue = 50)]
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public double InitialPriceOffset { get; set; }
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// Global variables:
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private const string LineObjectName = "EquityProjectionLine";
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private const string EquityLabelObjectName = "EquityProjectionLabel";
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private ChartHorizontalLine projectionLine;
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private ChartText equityLabel;
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private double projectionPrice = 0;
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private double projectedEquity = 0;
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private bool isVisible = true;
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protected override void Initialize()
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{
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// Check if the line already exists.
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projectionLine = Chart.FindObject(LineObjectName) as ChartHorizontalLine;
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if (projectionLine == null) // If the line doesn't exist yet.
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{
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// Initialize projection price near current price.
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projectionPrice = Symbol.Bid + (InitialPriceOffset * Symbol.PipSize);
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projectionPrice = Math.Round(projectionPrice, Symbol.Digits);
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DrawProjectionLine();
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}
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else
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{
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projectionPrice = projectionLine.Y;
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}
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CalculateProjectedEquity();
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// Set up timer for updates.
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Timer.Start(TimeSpan.FromSeconds(UpdateFrequency));
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// Subscribe to chart events.
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Chart.ObjectsUpdated += OnChartObjectsUpdated;
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Chart.KeyDown += OnChartKeyDown;
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Chart.ScrollChanged += OnChartScrollChanged;
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Chart.ZoomChanged += OnChartZoomChanged;
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}
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public override void Calculate(int index)
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{
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CalculateProjectedEquity();
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}
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protected override void OnTimer()
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{
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CalculateProjectedEquity();
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}
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private void OnChartObjectsUpdated(ChartObjectsUpdatedEventArgs obj)
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{
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if (obj.Chart.FindObject(LineObjectName) is ChartHorizontalLine line)
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{
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if (Math.Abs(line.Y - projectionPrice) > Symbol.TickSize)
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{
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projectionPrice = Math.Round(line.Y, Symbol.Digits);
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CalculateProjectedEquity();
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UpdateLabel();
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}
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}
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}
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private void OnChartKeyDown(ChartKeyboardEventArgs obj)
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{
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// Toggle visibility with Shift+E.
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if (obj.Key == Key.E && (obj.ShiftKey))
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{
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isVisible = !isVisible;
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ToggleVisibility();
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}
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}
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private void OnChartScrollChanged(ChartScrollEventArgs obj)
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{
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UpdateLabel();
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}
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private void OnChartZoomChanged(ChartZoomEventArgs obj)
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{
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UpdateLabel();
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}
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private void CalculateProjectedEquity()
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{
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// Get current account information.
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double currentEquity = Account.Equity;
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// Calculate total P&L change for positions in current symbol.
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double totalPLChange = 0;
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// Get all positions for current symbol.
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var symbolPositions = Positions.Where(p => p.SymbolName == Symbol.Name);
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foreach (var position in symbolPositions)
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{
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double posLots = position.VolumeInUnits;
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// Calculate point value for this position.
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double pointValue = Symbol.PipValue * position.VolumeInUnits / Symbol.LotSize;
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// Calculate projected P&L at projection price.
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double projectedPL = 0;
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if (position.TradeType == TradeType.Buy)
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{
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double priceDiff = projectionPrice - Symbol.Bid;
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// Convert price difference to pips and calculate P&L.
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projectedPL = (priceDiff / Symbol.PipSize) * pointValue;
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}
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else // Sell position.
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{
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// For sell positions, we need to account for spread.
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double spread = Symbol.Ask - Symbol.Bid;
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double projectedAsk = projectionPrice + spread;
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double priceDiff = Symbol.Ask - projectedAsk;
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// Convert price difference to pips and calculate P&L.
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projectedPL = (priceDiff / Symbol.PipSize) * pointValue;
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}
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totalPLChange += projectedPL;
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}
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// Calculate projected equity.
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projectedEquity = currentEquity + totalPLChange;
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// Update display.
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UpdateLabel();
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}
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private void DrawProjectionLine()
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{
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if (projectionPrice <= 0) return;
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// Remove existing line if it exists.
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if (projectionLine != null)
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{
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Chart.RemoveObject(LineObjectName);
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}
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// Create new horizontal line.
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projectionLine = Chart.DrawHorizontalLine(
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LineObjectName,
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projectionPrice,
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LineColor,
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LineWidth,
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LineStyleParam
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);
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projectionLine.IsInteractive = true;
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projectionLine.Comment = "Drag to change projection price";
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// Add or update label.
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UpdateLabel();
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}
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private void UpdateLabel()
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{
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if (projectionPrice <= 0 || !ShowLabel) return;
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// Ensure line exists.
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if (projectionLine == null || Chart.FindObject(LineObjectName) == null)
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{
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DrawProjectionLine();
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}
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// Remove existing label.
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if (equityLabel != null)
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{
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Chart.RemoveObject(EquityLabelObjectName);
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}
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// Format equity text with proper decimal places.
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string equityText = EquityLabelPrefix + projectedEquity.ToString("F2");
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// Calculate color based on equity change.
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double currentEquity = Account.Equity;
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Color equityColor = LineColor;
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if (projectedEquity > currentEquity)
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equityColor = LabelPositiveChangeColor;
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else if (projectedEquity < currentEquity)
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equityColor = LabelNegativeChangeColor;
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// Get the leftmost visible bar index.
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int firstVisibleBar = Chart.FirstVisibleBarIndex;
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// Create label at the left side of the chart.
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equityLabel = Chart.DrawText(
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EquityLabelObjectName,
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equityText,
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firstVisibleBar,
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projectionPrice,
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equityColor
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);
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equityLabel.FontSize = 12;
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equityLabel.HorizontalAlignment = HorizontalAlignment.Right;
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equityLabel.VerticalAlignment = VerticalAlignment.Top;
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equityLabel.IsInteractive = false;
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}
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private void ToggleVisibility()
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{
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if (isVisible)
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{
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// Hide objects.
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if (projectionLine != null)
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{
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projectionLine.IsHidden = true;
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}
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if (equityLabel != null)
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{
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equityLabel.IsHidden = true;
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}
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}
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else
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{
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// Show objects.
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if (projectionLine != null)
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{
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projectionLine.IsHidden = false;
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}
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if (equityLabel != null)
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{
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equityLabel.IsHidden = false;
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}
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}
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}
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}
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}
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//+------------------------------------------------------------------+

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