chore: Update various indicators to improve null handling and code readability

.deepsource.toml

@@ -3,6 +3,8 @@ version = 1
 [[analyzers]]
 name = "csharp"
 enabled = true
+  [analyzers.meta]
+  skip_rules = ["CS-R1131"]
 
 [[analyzers]]
 name = "test-coverage"
@@ -14,4 +16,4 @@ enabled = true
 
 [[transformers]]
 name = "dotnet-format"
-enabled = true
+enabled = true

README.md

@@ -147,6 +147,7 @@ QuanTAlib/
 ```
 
 Each indicator follows a consistent file pattern:
+
 - `Indicator.cs` - Core implementation
 - `Indicator.Tests.cs` - Unit tests
 - `Indicator.Validation.Tests.cs` - Cross-validation with other libraries
@@ -174,6 +175,7 @@ Apache License 2.0 - See [LICENSE](LICENSE) for details.
 ## Contributing
 
 Contributions welcome! Each indicator should include:
+
 1. Core implementation with streaming support
 2. Unit tests covering edge cases
 3. Validation tests against reference libraries

lib/trends/alma/Alma.cs

@@ -118,7 +118,7 @@ public sealed class Alma : ITValuePublisher
 
     public TSeries Update(TSeries source)
     {
-        if (source.Count == 0) return new TSeries(new List<long>(), new List<double>());
+        if (source.Count == 0) return new TSeries([], []);
 
         int len = source.Count;
         var t = new List<long>(len);

lib/trends/hma/Hma.cs

@@ -75,7 +75,7 @@ public sealed class Hma : ITValuePublisher
 
     public TSeries Update(TSeries source)
     {
-        if (source.Count == 0) return new TSeries([], new List<double>());
+        if (source.Count == 0) return new TSeries([], []);
 
         int len = source.Count;
         var t = new List<long>(len);

lib/trends/kama/Kama.cs

@@ -157,7 +157,7 @@ public sealed class Kama : ITValuePublisher
             if (er > 1.0) er = 1.0;
 
             double sc = er * (_fastAlpha - _slowAlpha) + _slowAlpha;
-            sc = sc * sc;
+            sc *= sc;
 
             _kama = _p_kama + sc * (val - _p_kama);
         }
@@ -169,7 +169,7 @@ public sealed class Kama : ITValuePublisher
 
     public TSeries Update(TSeries source)
     {
-        if (source.Count == 0) return new TSeries(new List<long>(), new List<double>());
+        if (source.Count == 0) return new TSeries([], []);
 
         int len = source.Count;
         var t = new List<long>(len);

lib/trends/t3/T3.cs

@@ -172,7 +172,7 @@ public sealed class T3 : ITValuePublisher
 
     public TSeries Update(TSeries source)
     {
-        if (source.Count == 0) return new TSeries(new List<long>(), new List<double>());
+        if (source.Count == 0) return new TSeries();
 
         int len = source.Count;
         var t = new List<long>(len);
@@ -269,7 +269,7 @@ public sealed class T3 : ITValuePublisher
         double c4 = 1.0 + 3.0 * v + 3.0 * v2 + v3;
 
         var p = new Parameters(alpha, c1, c2, c3, c4);
-        State state = State.New();
+        var state = State.New();
         double lastValidValue = 0;
 
         CalculateCore(source, output, p, ref state, ref lastValidValue);

quantower/IndicatorExtensions.cs

@@ -119,8 +119,8 @@ public static class IndicatorExtensions
 
     public static List<Point> GetSmoothCurvePoints(Indicator indicator, IChartWindowCoordinatesConverter converter, Rectangle clientRect, LineSeries series)
     {
-        if (indicator == null) throw new ArgumentNullException(nameof(indicator));
-        if (converter == null) throw new ArgumentNullException(nameof(converter));
+        ArgumentNullException.ThrowIfNull(indicator);
+        ArgumentNullException.ThrowIfNull(converter);
         var data = indicator.HistoricalData;
         if (data == null) return new List<Point>();
 
@@ -193,8 +193,8 @@ public static class IndicatorExtensions
 
     public static List<(Rectangle Rect, Color Color)> GetHistogramRectangles(Indicator indicator, IChartWindowCoordinatesConverter converter, Rectangle clientRect, LineSeries series)
     {
-        if (indicator == null) throw new ArgumentNullException(nameof(indicator));
-        if (converter == null) throw new ArgumentNullException(nameof(converter));
+        ArgumentNullException.ThrowIfNull(indicator);
+        ArgumentNullException.ThrowIfNull(converter);
         var data = indicator.HistoricalData;
         if (data == null) return new List<(Rectangle, Color)>();