feat: Dpo, Tsi, Vortex, Bpp, Cci, Cfo, Tr, Ui, Vc, Vov, Vr, Vs, Mfi, Nvi, Obv, Pvi, Pvo, Pvol, Pvr, Pvt, Tvi

lib/oscillators/Bop.cs

@@ -0,0 +1,66 @@
+using System.Runtime.CompilerServices;
+namespace QuanTAlib;
+
+/// <summary>
+/// BOP: Balance of Power
+/// A momentum oscillator that measures the strength of buying and selling pressure by comparing
+/// closing prices to their corresponding opening prices.
+/// </summary>
+/// <remarks>
+/// The BOP calculation process:
+/// 1. Calculate (Close - Open) / (High - Low) for each period
+/// 2. A positive BOP indicates buying pressure (bullish)
+/// 3. A negative BOP indicates selling pressure (bearish)
+///
+/// Key characteristics:
+/// - Oscillates above and below zero
+/// - No upper or lower bounds
+/// - Zero line acts as equilibrium between buying and selling pressure
+/// - Can be used to identify potential trend reversals and divergences
+///
+/// Formula:
+/// BOP = (Close - Open) / (High - Low)
+///
+/// Sources:
+///     Igor Livshin (1990s)
+///     https://www.investopedia.com/terms/b/bop.asp
+/// </remarks>
+
+[SkipLocalsInit]
+public sealed class Bop : AbstractBase
+{
+    /// <param name="source">The data source object that publishes updates.</param>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public Bop(object source) : this()
+    {
+        var pubEvent = source.GetType().GetEvent("Pub");
+        pubEvent?.AddEventHandler(source, new BarSignal(Sub));
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public Bop()
+    {
+        WarmupPeriod = 1;
+        Name = "BOP";
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    protected override void ManageState(bool isNew)
+    {
+        if (isNew)
+        {
+            _index++;
+        }
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    protected override double Calculation()
+    {
+        ManageState(BarInput.IsNew);
+
+        var range = BarInput.High - BarInput.Low;
+        if (range <= double.Epsilon) return 0;
+
+        return (BarInput.Close - BarInput.Open) / range;
+    }
+}