autocad 获取块外轮廓

根据提供的引用内容，我无法直接回答您的问题。引用似乎是一个关于AutoCAD和C#的资源文件，其中包含了获取图案填充的边界线的相关信息。如果您需要获取AutoCAD中块的外轮廓，您可以尝试使用AutoCAD的API来实现。以下是一个示例代码，演示了如何使用AutoCAD的API获取块的外轮廓：

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;

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

    PromptEntityOptions peo = new PromptEntityOptions("\nSelect a block: ");
    peo.SetRejectMessage("\nInvalid selection. Please select a block.");
    peo.AddAllowedClass(typeof(BlockReference), true);

    PromptEntityResult per = ed.GetEntity(peo);
    if (per.Status != PromptStatus.OK)
        return;

    using (Transaction tr = db.TransactionManager.StartTransaction())
    {
        BlockReference blockRef = tr.GetObject(per.ObjectId, OpenMode.ForRead) as BlockReference;
        if (blockRef != null)
        {
            BlockTableRecord blockDef = tr.GetObject(blockRef.BlockTableRecord, OpenMode.ForRead) as BlockTableRecord;
            if (blockDef != null)
            {
                Polyline outline = new Polyline();
                foreach (ObjectId objId in blockDef)
                {
                    Entity ent = tr.GetObject(objId, OpenMode.ForRead) as Entity;
                    if (ent != null && ent.Visible)
                    {
                        if (ent is Polyline)
                        {
                            Polyline pline = ent as Polyline;
                            for (int i = 0; i < pline.NumberOfVertices; i++)
                            {
                                Point2d vertex = pline.GetPoint2dAt(i);
                                outline.AddVertexAt(outline.NumberOfVertices, vertex, 0, 0, 0);
                            }
                        }
                        else if (ent is Circle)
                        {
                            Circle circle = ent as Circle;
                            outline.AddVertexAt(outline.NumberOfVertices, circle.Center, 0, 0, 0);
                        }
                        // Add more cases for other types of entities if needed
                    }
                }

                // Display the outline
                if (outline.NumberOfVertices > 0)
                {
                    outline.Closed = true;
                    BlockTable bt = tr.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
                    BlockTableRecord ms = tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;
                    ms.AppendEntity(outline);
                    tr.AddNewlyCreatedDBObject(outline, true);
                    tr.Commit();

                    ed.WriteMessage("\nBlock outline created.");
                }
                else
                {
                    ed.WriteMessage("\nNo visible entities found in the block.");
                }
            }
        }
    }
}

请注意，上述代码是使用AutoCAD的C# API编写的，您需要在安装了AutoCAD的计算机上运行它。此代码将提示您选择一个块，并获取该块的外轮廓。如果块中包含多个实体（如多段线、圆等），它将将它们合并为一个多段线，并将其显示在模型空间中。