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feat(engine): extract ML features from canonical drawing frame

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This commit is contained in:
AJ Isaacs
2026-04-20 09:23:21 -04:00
parent d228b6b812
commit a2e9fd4d14
1 changed files with 9 additions and 6 deletions
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OpenNest.Engine/ML/FeatureExtractor.cs
+9 -6
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@@ -27,7 +27,10 @@ namespace OpenNest.Engine.ML
{ {
public static PartFeatures Extract(Drawing drawing) public static PartFeatures Extract(Drawing drawing)
{ {
var entities = OpenNest.Converters.ConvertProgram.ToGeometry(drawing.Program) // Normalize to canonical frame so features are invariant to import orientation.
var canonical = CanonicalFrame.AsCanonicalCopy(drawing);
var entities = OpenNest.Converters.ConvertProgram.ToGeometry(canonical.Program)
.Where(e => e.Layer != SpecialLayers.Rapid) .Where(e => e.Layer != SpecialLayers.Rapid)
.ToList(); .ToList();
@@ -45,18 +48,18 @@ namespace OpenNest.Engine.ML
var features = new PartFeatures var features = new PartFeatures
{ {
Area = drawing.Area, Area = canonical.Area,
Convexity = drawing.Area / (hullArea > 0 ? hullArea : 1.0), Convexity = canonical.Area / (hullArea > 0 ? hullArea : 1.0),
AspectRatio = bb.Length / (bb.Width > 0 ? bb.Width : 1.0), AspectRatio = bb.Length / (bb.Width > 0 ? bb.Width : 1.0),
BoundingBoxFill = drawing.Area / (bb.Area() > 0 ? bb.Area() : 1.0), BoundingBoxFill = canonical.Area / (bb.Area() > 0 ? bb.Area() : 1.0),
VertexCount = polygon.Vertices.Count, VertexCount = polygon.Vertices.Count,
Bitmask = GenerateBitmask(polygon, 32) Bitmask = GenerateBitmask(polygon, 32)
}; };
// Circularity = 4 * PI * Area / Perimeter^2 // Circularity = 4 * PI * Area / Perimeter^2
var perimeterLen = polygon.Perimeter(); var perimeterLen = polygon.Perimeter();
features.Circularity = (4 * System.Math.PI * drawing.Area) / (perimeterLen * perimeterLen); features.Circularity = (4 * System.Math.PI * canonical.Area) / (perimeterLen * perimeterLen);
features.PerimeterToAreaRatio = drawing.Area > 0 ? perimeterLen / drawing.Area : 0; features.PerimeterToAreaRatio = canonical.Area > 0 ? perimeterLen / canonical.Area : 0;
return features; return features;
} }