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feat: add SplitDxfWriter for split DXF output with bend data

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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
AJ Isaacs
2026-03-24 20:43:40 -04:00
parent a7f8972722
commit e1bcb7498f
2 changed files with 185 additions and 6 deletions
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177
OpenNest.IO/SplitDxfWriter.cs Normal file
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@@ -0,0 +1,177 @@
using ACadSharp;
using ACadSharp.Entities;
using ACadSharp.IO;
using ACadSharp.Tables;
using CSMath;
using OpenNest.Bending;
using OpenNest.Converters;
using OpenNest.Geometry;
using System.Collections.Generic;
using System.IO;
// Disambiguate Entity — both ACadSharp.Entities and OpenNest.Geometry define it
using GeoEntity = OpenNest.Geometry.Entity;
namespace OpenNest.IO
{
public class SplitDxfWriter
{
private const double DefaultEtchLength = 1.0;
public double EtchLength { get; set; } = DefaultEtchLength;
public void Write(string path, Drawing drawing)
{
var doc = new CadDocument();
var cutLayer = new ACadSharp.Tables.Layer("CUT") { Color = new Color(7) };
var bendLayer = new ACadSharp.Tables.Layer("BEND") { Color = new Color(2) };
var etchLayer = new ACadSharp.Tables.Layer("ETCH") { Color = new Color(3) };
doc.Layers.Add(cutLayer);
doc.Layers.Add(bendLayer);
doc.Layers.Add(etchLayer);
var centerLineType = new LineType("CENTERX2");
doc.LineTypes.Add(centerLineType);
WriteProgramEntities(doc, drawing.Program, cutLayer);
if (drawing.Bends != null)
{
foreach (var bend in drawing.Bends)
{
WriteBendLine(doc, bend, bendLayer, centerLineType);
WriteEtchLines(doc, bend, etchLayer);
}
}
using var stream = File.Create(path);
using var writer = new DxfWriter(stream, doc, false);
writer.Write();
}
private static void WriteProgramEntities(CadDocument doc, CNC.Program program, ACadSharp.Tables.Layer layer)
{
var geometry = ConvertProgram.ToGeometry(program);
WriteGeometryEntities(doc, geometry, layer);
}
private static void WriteGeometryEntities(CadDocument doc, List<GeoEntity> geometry, ACadSharp.Tables.Layer layer)
{
foreach (var entity in geometry)
{
// Skip rapid moves
if (entity.Layer == SpecialLayers.Rapid)
continue;
switch (entity)
{
case OpenNest.Geometry.Line line:
doc.Entities.Add(new ACadSharp.Entities.Line
{
StartPoint = new XYZ(line.StartPoint.X, line.StartPoint.Y, 0),
EndPoint = new XYZ(line.EndPoint.X, line.EndPoint.Y, 0),
Layer = layer
});
break;
case OpenNest.Geometry.Arc arc:
var startAngle = arc.StartAngle;
var endAngle = arc.EndAngle;
if (arc.IsReversed)
OpenNest.Math.Generic.Swap(ref startAngle, ref endAngle);
doc.Entities.Add(new ACadSharp.Entities.Arc
{
Center = new XYZ(arc.Center.X, arc.Center.Y, 0),
Radius = arc.Radius,
StartAngle = startAngle,
EndAngle = endAngle,
Layer = layer
});
break;
case OpenNest.Geometry.Circle circle:
doc.Entities.Add(new ACadSharp.Entities.Circle
{
Center = new XYZ(circle.Center.X, circle.Center.Y, 0),
Radius = circle.Radius,
Layer = layer
});
break;
case OpenNest.Geometry.Shape shape:
WriteGeometryEntities(doc, shape.Entities, layer);
break;
}
}
}
private static void WriteBendLine(CadDocument doc, Bend bend, ACadSharp.Tables.Layer layer, LineType lineType)
{
var line = new ACadSharp.Entities.Line
{
StartPoint = new XYZ(bend.StartPoint.X, bend.StartPoint.Y, 0),
EndPoint = new XYZ(bend.EndPoint.X, bend.EndPoint.Y, 0),
Layer = layer,
LineType = lineType
};
doc.Entities.Add(line);
if (!string.IsNullOrEmpty(bend.NoteText))
{
var midX = (bend.StartPoint.X + bend.EndPoint.X) / 2;
var midY = (bend.StartPoint.Y + bend.EndPoint.Y) / 2;
var mtext = new MText
{
InsertPoint = new XYZ(midX, midY + 0.5, 0),
Value = bend.NoteText,
Height = 0.1,
Layer = layer
};
doc.Entities.Add(mtext);
}
}
private void WriteEtchLines(CadDocument doc, Bend bend, ACadSharp.Tables.Layer layer)
{
if (bend.Direction != BendDirection.Up)
return;
var start = bend.StartPoint;
var end = bend.EndPoint;
var length = bend.Length;
if (length < EtchLength * 3.0)
{
doc.Entities.Add(new ACadSharp.Entities.Line
{
StartPoint = new XYZ(start.X, start.Y, 0),
EndPoint = new XYZ(end.X, end.Y, 0),
Layer = layer
});
}
else
{
var angle = start.AngleTo(end);
var dx = System.Math.Cos(angle) * EtchLength;
var dy = System.Math.Sin(angle) * EtchLength;
doc.Entities.Add(new ACadSharp.Entities.Line
{
StartPoint = new XYZ(start.X, start.Y, 0),
EndPoint = new XYZ(start.X + dx, start.Y + dy, 0),
Layer = layer
});
doc.Entities.Add(new ACadSharp.Entities.Line
{
StartPoint = new XYZ(end.X, end.Y, 0),
EndPoint = new XYZ(end.X - dx, end.Y - dy, 0),
Layer = layer
});
}
}
}
}

14
OpenNest/Forms/CadConverterForm.cs
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@@ -249,17 +249,19 @@ namespace OpenNest.Forms
var index = fileList.SelectedIndex;
var newItems = new List<string>();
var splitWriter = new SplitDxfWriter();
for (var i = 0; i < form.ResultDrawings.Count; i++)
{
var splitDrawing = form.ResultDrawings[i];
// Assign bends from the source item — spatial filtering is a future enhancement
splitDrawing.Bends.AddRange(item.Bends);
var splitName = $"{baseName}_split{i + 1}.dxf";
var splitPath = GetUniquePath(Path.Combine(writableDir, splitName));
// TODO: Use SplitDxfWriter when implemented
// For now, export via DxfExporter
var exporter = new DxfExporter();
using var stream = new FileStream(splitPath, FileMode.Create);
exporter.ExportProgram(form.ResultDrawings[i].Program, stream);
splitWriter.Write(splitPath, splitDrawing);
newItems.Add(splitPath);
}