Eğrisel Nesnelerin Parçalara Bölünmesi

Curve2Segments() yordamı eğrisel nesneleri istenilen sayıda lineer parçaya bölerek bir LWPOLYLINE oluşturuyor. Geçerli olduğu nesneler ise ARC, CIRCLE, LWPOLYLINE, 2DPOLYLINE, LINE, SPLINE ve ELLIPSE AutoCAD nesneleri.

Şekil-1

public static void Curve2Segments()
{
    Document doc = Application.DocumentManager.MdiActiveDocument;
    Database db = doc.Database;
    Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;

    TypedValue[] tyVals = new TypedValue[9]
    { 
        new TypedValue(-4, "<OR"),
        new TypedValue((int)DxfCode.Start, "SPLINE"),
        new TypedValue((int)DxfCode.Start, "LINE"),
        new TypedValue((int)DxfCode.Start, "ARC"),
        new TypedValue((int)DxfCode.Start, "POLYLINE"),
        new TypedValue((int)DxfCode.Start, "LWPOLYLINE"),
        new TypedValue((int)DxfCode.Start, "CIRCLE"),
        new TypedValue((int)DxfCode.Start, "ELLIPSE"),
        new TypedValue(-4, "OR>")
    };
    SelectionFilter selFilter = new SelectionFilter(tyVals);
            

    PromptIntegerOptions pIntOpts = new PromptIntegerOptions("\nEnter number of segments: ");
    PromptIntegerResult pIntRes = ed.GetInteger(pIntOpts);
    if (pIntRes.Status != PromptStatus.OK)
        return;

    PromptSelectionOptions pSelOpts = new PromptSelectionOptions();
    pSelOpts.AllowDuplicates = false;
    pSelOpts.SingleOnly = false;
    PromptSelectionResult pSelRes = doc.Editor.GetSelection(pSelOpts, selFilter);
    if (pSelRes.Status != PromptStatus.OK)
        return;

    using (Transaction tr = db.TransactionManager.StartTransaction())
    {
        BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead, false);
        BlockTableRecord btr = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace],
                                OpenMode.ForWrite, false);

        int numberOfSegments = pIntRes.Value;
        foreach (ObjectId id in pSelRes.Value.GetObjectIds())
        {
            Point2dCollection pnts = new Point2dCollection();
            Curve curve = (Curve)tr.GetObject(id, OpenMode.ForWrite);
            double curveLength = curve.GetDistanceAtParameter(curve.EndParam);
            for (int i = 0; i < numberOfSegments; i++)
            {
                double tmpDist = i * curveLength / numberOfSegments;
                Point3d tmpPnt = curve.GetPointAtDist(tmpDist);
                pnts.Add(new Point2d(tmpPnt.X, tmpPnt.Y));
            }

            Polyline pLine = new Polyline();
            pLine.SetDatabaseDefaults();
            for (int i = 0; i < pnts.Count; i++)
            {
                pLine.AddVertexAt(i, pnts[i], 0.0, 0.0, 0.0);
            }
            pLine.Layer = curve.Layer;
            pLine.Color = curve.Color;
            pLine.Closed = curve.Closed;

            btr.AppendEntity(pLine);
            tr.AddNewlyCreatedDBObject(pLine, true);
            curve.Erase();
        }

        tr.Commit();
    }
}