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feat: update FindBestRotation to use rotating calipers algorithm

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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
AJ Isaacs
2026-03-06 22:49:09 -05:00
parent a190ed25b4
commit 1c8763a201
3 changed files with 56 additions and 36 deletions
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73
OpenNest.Core/Geometry/Entity.cs
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@@ -231,39 +231,60 @@ namespace OpenNest.Geometry
public static class EntityExtensions
{
public static double FindBestRotation(this List<Entity> entities, double stepAngle, double startAngle = 0, double endAngle = Angle.TwoPI)
public static BoundingRectangleResult FindBestRotation(this List<Entity> entities, double startAngle = 0, double endAngle = Angle.TwoPI)
{
startAngle = Angle.NormalizeRad(startAngle);
var points = new List<Vector>();
if (!endAngle.IsEqualTo(Angle.TwoPI))
endAngle = Angle.NormalizeRad(endAngle);
if (stepAngle.IsEqualTo(0.0))
return startAngle;
entities.ForEach(e => e.Rotate(startAngle));
var bestAngle = startAngle;
var bestArea = entities.GetBoundingBox().Area();
var steps = startAngle < endAngle
? (endAngle - startAngle) / stepAngle
: (endAngle + Angle.TwoPI) - startAngle / stepAngle;
for (int i = 1; i <= steps; ++i)
foreach (var entity in entities)
{
entities.ForEach(e => e.Rotate(stepAngle));
var area = entities.GetBoundingBox().Area();
if (area < bestArea)
switch (entity.Type)
{
bestArea = area;
bestAngle = startAngle + stepAngle * i;
case EntityType.Line:
var line = (Line)entity;
points.Add(line.StartPoint);
points.Add(line.EndPoint);
break;
case EntityType.Arc:
var arc = (Arc)entity;
points.Add(arc.StartPoint());
points.Add(arc.EndPoint());
points.Add(arc.Center.Offset(arc.Radius, 0));
points.Add(arc.Center.Offset(-arc.Radius, 0));
points.Add(arc.Center.Offset(0, arc.Radius));
points.Add(arc.Center.Offset(0, -arc.Radius));
break;
case EntityType.Circle:
var circle = (Circle)entity;
points.Add(circle.Center.Offset(circle.Radius, 0));
points.Add(circle.Center.Offset(-circle.Radius, 0));
points.Add(circle.Center.Offset(0, circle.Radius));
points.Add(circle.Center.Offset(0, -circle.Radius));
break;
case EntityType.Polygon:
var polygon = (Polygon)entity;
points.AddRange(polygon.Vertices);
break;
case EntityType.Shape:
var shape = (Shape)entity;
var subResult = shape.Entities.FindBestRotation(startAngle, endAngle);
return subResult;
}
}
return bestAngle;
if (points.Count == 0)
return new BoundingRectangleResult(startAngle, 0, 0);
var hull = ConvexHull.Compute(points);
bool constrained = !startAngle.IsEqualTo(0) || !endAngle.IsEqualTo(Angle.TwoPI);
return constrained
? RotatingCalipers.MinimumBoundingRectangle(hull, startAngle, endAngle)
: RotatingCalipers.MinimumBoundingRectangle(hull);
}
}
}