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feat(engine): add perimeter-to-area ratio to part features

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Adds PerimeterToAreaRatio (perimeter / area) as a spacing sensitivity
indicator for ML feature extraction.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
AJ Isaacs
2026-03-14 14:41:30 -04:00
parent bf104309b4
commit 74272bea80
1 changed files with 3 additions and 1 deletions
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4
OpenNest.Engine/ML/FeatureExtractor.cs
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@@ -13,6 +13,7 @@ namespace OpenNest.Engine.ML
public double AspectRatio { get; set; } // Width / Length
public double BoundingBoxFill { get; set; } // Area / (Width * Length)
public double Circularity { get; set; } // 4 * PI * Area / Perimeter^2
public double PerimeterToAreaRatio { get; set; } // Perimeter / Area — spacing sensitivity
public int VertexCount { get; set; }
// --- Normalized Bitmask (32x32 = 1024 features) ---
@@ -20,7 +21,7 @@ namespace OpenNest.Engine.ML
public override string ToString()
{
return $"{Area:F2},{Convexity:F4},{AspectRatio:F4},{BoundingBoxFill:F4},{Circularity:F4},{VertexCount}";
return $"{Area:F2},{Convexity:F4},{AspectRatio:F4},{BoundingBoxFill:F4},{Circularity:F4},{PerimeterToAreaRatio:F4},{VertexCount}";
}
}
@@ -57,6 +58,7 @@ namespace OpenNest.Engine.ML
// Circularity = 4 * PI * Area / Perimeter^2
var perimeterLen = polygon.Perimeter();
features.Circularity = (4 * System.Math.PI * drawing.Area) / (perimeterLen * perimeterLen);
features.PerimeterToAreaRatio = drawing.Area > 0 ? perimeterLen / drawing.Area : 0;
return features;
}