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feat: add etch mark entities from bend lines to CNC program pipeline

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Etch marks for up bends are now real geometry entities on an ETCH layer
instead of being drawn dynamically. They flow through the full pipeline:
entities → FilterPanel layers → ConvertGeometry (tagged as Scribe) →
post-processor sequencing before cut geometry.

Also includes ShapeProfile normalization (CW perimeter, CCW cutouts)
applied consistently across all import paths, and inward offset support
for cutout shapes in overlap/offset polygon calculations.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
AJ Isaacs
2026-03-28 00:42:49 -04:00
parent 80e8693da3
commit 2db8c49838
15 changed files with 306 additions and 147 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
OpenNest.Core/Bending/Bend.cs
View File

@@ -1,10 +1,20 @@
using OpenNest.Geometry;
using OpenNest.Math;
using System.Collections.Generic;
using System.Drawing;
namespace OpenNest.Bending
{
public class Bend
{
public static readonly Layer EtchLayer = new Layer("ETCH")
{
Color = Color.Green,
IsVisible = true
};
private const double DefaultEtchLength = 1.0;
public Vector StartPoint { get; set; }
public Vector EndPoint { get; set; }
public BendDirection Direction { get; set; }
@@ -29,6 +39,52 @@ namespace OpenNest.Bending
/// </summary>
public double LineAngle => StartPoint.AngleTo(EndPoint);
/// <summary>
/// Generates etch mark entities for this bend (up bends only).
/// Returns 1" dashes at each end of the bend line, or the full line if shorter than 3".
/// </summary>
public List<Line> GetEtchEntities(double etchLength = DefaultEtchLength)
{
var result = new List<Line>();
if (Direction != BendDirection.Up)
return result;
var length = Length;
if (length < etchLength * 3.0)
{
result.Add(CreateEtchLine(StartPoint, EndPoint));
}
else
{
var angle = StartPoint.AngleTo(EndPoint);
var dx = System.Math.Cos(angle) * etchLength;
var dy = System.Math.Sin(angle) * etchLength;
result.Add(CreateEtchLine(StartPoint, new Vector(StartPoint.X + dx, StartPoint.Y + dy)));
result.Add(CreateEtchLine(new Vector(EndPoint.X - dx, EndPoint.Y - dy), EndPoint));
}
return result;
}
/// <summary>
/// Removes existing etch entities from the list and regenerates from the given bends.
/// </summary>
public static void UpdateEtchEntities(List<Entity> entities, List<Bend> bends)
{
entities.RemoveAll(e => e.Layer == EtchLayer);
if (bends == null) return;
foreach (var bend in bends)
entities.AddRange(bend.GetEtchEntities());
}
private static Line CreateEtchLine(Vector start, Vector end)
{
return new Line(start, end) { Layer = EtchLayer, Color = Color.Green };
}
public override string ToString()
{
var dir = Direction.ToString();

5
OpenNest.Core/Converters/ConvertGeometry.cs
View File

@@ -108,7 +108,10 @@ namespace OpenNest.Converters
if (line.StartPoint != lastpt)
pgm.MoveTo(line.StartPoint);
pgm.LineTo(line.EndPoint);
var move = new LinearMove(line.EndPoint);
if (string.Equals(line.Layer?.Name, "ETCH", System.StringComparison.OrdinalIgnoreCase))
move.Layer = LayerType.Scribe;
pgm.Codes.Add(move);
lastpt = line.EndPoint;
return lastpt;

35
OpenNest.Core/Geometry/Shape.cs
View File

@@ -598,6 +598,41 @@ namespace OpenNest.Geometry
return result;
}
/// <summary>
/// Offsets the shape inward by the given distance.
/// Normalizes to CCW winding before offsetting Left (which is inward for CCW),
/// making the method independent of the original contour winding direction.
/// </summary>
public Shape OffsetInward(double distance)
{
var poly = ToPolygon();
if (poly == null || poly.Vertices.Count < 3
|| poly.RotationDirection() == RotationType.CCW)
return OffsetEntity(distance, OffsetSide.Left) as Shape;
// Create a reversed copy to avoid mutating shared entity objects.
var copy = new Shape();
for (var i = Entities.Count - 1; i >= 0; i--)
{
switch (Entities[i])
{
case Line l:
copy.Entities.Add(new Line(l.EndPoint, l.StartPoint) { Layer = l.Layer });
break;
case Arc a:
copy.Entities.Add(new Arc(a.Center, a.Radius, a.EndAngle, a.StartAngle, !a.IsReversed) { Layer = a.Layer });
break;
case Circle c:
copy.Entities.Add(new Circle(c.Center, c.Radius) { Layer = c.Layer });
break;
}
}
return copy.OffsetEntity(distance, OffsetSide.Left) as Shape;
}
/// <summary>
/// Gets the closest point on the shape to the given point.
/// </summary>

48
OpenNest.Core/Geometry/ShapeProfile.cs
View File

@@ -1,4 +1,5 @@
using System.Collections.Generic;
using System.Linq;
namespace OpenNest.Geometry
{
@@ -41,5 +42,52 @@ namespace OpenNest.Geometry
public Shape Perimeter { get; set; }
public List<Shape> Cutouts { get; set; }
/// <summary>
/// Ensures CNC-standard winding: perimeter CW (kerf left = outward),
/// cutouts CCW (kerf left = inward). Reverses contours in-place as needed.
/// </summary>
public void NormalizeWinding()
{
EnsureWinding(Perimeter, RotationType.CW);
foreach (var cutout in Cutouts)
EnsureWinding(cutout, RotationType.CCW);
}
/// <summary>
/// Returns the entities in normalized winding order (perimeter first, then cutouts).
/// </summary>
public List<Entity> ToNormalizedEntities()
{
NormalizeWinding();
var result = new List<Entity>(Perimeter.Entities);
foreach (var cutout in Cutouts)
result.AddRange(cutout.Entities);
return result;
}
/// <summary>
/// Convenience method: builds a ShapeProfile from raw entities,
/// normalizes winding, and returns the corrected entity list.
/// </summary>
public static List<Entity> NormalizeEntities(IEnumerable<Entity> entities)
{
var profile = new ShapeProfile(entities.ToList());
return profile.ToNormalizedEntities();
}
private static void EnsureWinding(Shape shape, RotationType desired)
{
var poly = shape.ToPolygon();
if (poly != null && poly.Vertices.Count >= 3
&& poly.RotationDirection() != desired)
{
shape.Reverse();
}
}
}
}

98
OpenNest.Core/PartGeometry.cs
View File

@@ -42,23 +42,17 @@ namespace OpenNest
public static List<Line> GetOffsetPartLines(Part part, double spacing, double chordTolerance = 0.001)
{
var entities = ConvertProgram.ToGeometry(part.Program);
var shapes = ShapeBuilder.GetShapes(entities.Where(e => e.Layer != SpecialLayers.Rapid));
var profile = new ShapeProfile(
entities.Where(e => e.Layer != SpecialLayers.Rapid).ToList());
var lines = new List<Line>();
var totalSpacing = spacing + chordTolerance;
foreach (var shape in shapes)
{
// Add chord tolerance to compensate for inscribed polygon chords
// being inside the actual offset arcs.
var offsetEntity = shape.OffsetOutward(spacing + chordTolerance);
AddOffsetLines(lines, profile.Perimeter.OffsetOutward(totalSpacing),
chordTolerance, part.Location);
if (offsetEntity == null)
continue;
var polygon = offsetEntity.ToPolygonWithTolerance(chordTolerance);
polygon.RemoveSelfIntersections();
polygon.Offset(part.Location);
lines.AddRange(polygon.ToLines());
}
foreach (var cutout in profile.Cutouts)
AddOffsetLines(lines, cutout.OffsetInward(totalSpacing),
chordTolerance, part.Location);
return lines;
}
@@ -66,21 +60,17 @@ namespace OpenNest
public static List<Line> GetOffsetPartLines(Part part, double spacing, PushDirection facingDirection, double chordTolerance = 0.001)
{
var entities = ConvertProgram.ToGeometry(part.Program);
var shapes = ShapeBuilder.GetShapes(entities.Where(e => e.Layer != SpecialLayers.Rapid));
var profile = new ShapeProfile(
entities.Where(e => e.Layer != SpecialLayers.Rapid).ToList());
var lines = new List<Line>();
var totalSpacing = spacing + chordTolerance;
foreach (var shape in shapes)
{
var offsetEntity = shape.OffsetOutward(spacing + chordTolerance);
AddOffsetDirectionalLines(lines, profile.Perimeter.OffsetOutward(totalSpacing),
chordTolerance, part.Location, facingDirection);
if (offsetEntity == null)
continue;
var polygon = offsetEntity.ToPolygonWithTolerance(chordTolerance);
polygon.RemoveSelfIntersections();
polygon.Offset(part.Location);
lines.AddRange(GetDirectionalLines(polygon, facingDirection));
}
foreach (var cutout in profile.Cutouts)
AddOffsetDirectionalLines(lines, cutout.OffsetInward(totalSpacing),
chordTolerance, part.Location, facingDirection);
return lines;
}
@@ -104,21 +94,17 @@ namespace OpenNest
public static List<Line> GetOffsetPartLines(Part part, double spacing, Vector facingDirection, double chordTolerance = 0.001)
{
var entities = ConvertProgram.ToGeometry(part.Program);
var shapes = ShapeBuilder.GetShapes(entities.Where(e => e.Layer != SpecialLayers.Rapid));
var profile = new ShapeProfile(
entities.Where(e => e.Layer != SpecialLayers.Rapid).ToList());
var lines = new List<Line>();
var totalSpacing = spacing + chordTolerance;
foreach (var shape in shapes)
{
var offsetEntity = shape.OffsetOutward(spacing + chordTolerance);
AddOffsetDirectionalLines(lines, profile.Perimeter.OffsetOutward(totalSpacing),
chordTolerance, part.Location, facingDirection);
if (offsetEntity == null)
continue;
var polygon = offsetEntity.ToPolygonWithTolerance(chordTolerance);
polygon.RemoveSelfIntersections();
polygon.Offset(part.Location);
lines.AddRange(GetDirectionalLines(polygon, facingDirection));
}
foreach (var cutout in profile.Cutouts)
AddOffsetDirectionalLines(lines, cutout.OffsetInward(totalSpacing),
chordTolerance, part.Location, facingDirection);
return lines;
}
@@ -189,5 +175,41 @@ namespace OpenNest
return lines;
}
private static void AddOffsetLines(List<Line> lines, Shape offsetEntity,
double chordTolerance, Vector location)
{
if (offsetEntity == null)
return;
var polygon = offsetEntity.ToPolygonWithTolerance(chordTolerance);
polygon.RemoveSelfIntersections();
polygon.Offset(location);
lines.AddRange(polygon.ToLines());
}
private static void AddOffsetDirectionalLines(List<Line> lines, Shape offsetEntity,
double chordTolerance, Vector location, PushDirection facingDirection)
{
if (offsetEntity == null)
return;
var polygon = offsetEntity.ToPolygonWithTolerance(chordTolerance);
polygon.RemoveSelfIntersections();
polygon.Offset(location);
lines.AddRange(GetDirectionalLines(polygon, facingDirection));
}
private static void AddOffsetDirectionalLines(List<Line> lines, Shape offsetEntity,
double chordTolerance, Vector location, Vector facingDirection)
{
if (offsetEntity == null)
return;
var polygon = offsetEntity.ToPolygonWithTolerance(chordTolerance);
polygon.RemoveSelfIntersections();
polygon.Offset(location);
lines.AddRange(GetDirectionalLines(polygon, facingDirection));
}
}
}