c#, Autocad, 显示填充的属性

Question

我正在使用 C# 编写 AutoCAD 插件，需要在阴影对象的中间(例如，圆心)显示阴影属性。我在代码中有两个问题:

1. 如何访问圆心？

2. 如何获取hatch的属性？

我在 autocad 中的这一行遇到错误。

acText.TextString = hatch.Area.ToString(); // Area of hatch

下面是主要摘自Stackflow的代码.

 [CommandMethod("DisplyArea")]
        public static void SelectCirclesToHatch()
        {
            var doc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
            var db = doc.Database;
            var ed = doc.Editor;
            var filter = new SelectionFilter(new[] { new TypedValue(0, "CIRCLE") });
            var selection = ed.GetSelection(filter);
            int vr = 1;
            if (selection.Status != PromptStatus.OK)
                return;
            using (var tr = db.TransactionManager.StartTransaction())
            {
                var curSpace = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
                foreach (var id in selection.Value.GetObjectIds())
                {
                    var ids = new ObjectIdCollection(new[] { id });
                    using (var hatch = new Hatch())
                    {
                        curSpace.AppendEntity(hatch);
                        tr.AddNewlyCreatedDBObject(hatch, true);
                        hatch.SetHatchPattern(HatchPatternType.PreDefined, "ANSI31");
                        hatch.Associative = true;
                        hatch.AppendLoop(HatchLoopTypes.Outermost, ids);
                        hatch.EvaluateHatch(true);
                        DBText acText = new DBText();

//它需要是 CIRCLE.CENTER，但我怎样才能访问它？？？？？

                        acText.Position = new Point3d(2,2,0);     
         
                        acText.TextString = hatch.Area.ToString(); // Area of hatch
                        acText.Height = 0.5;
                        curSpace.AppendEntity(acText);
                        tr.AddNewlyCreatedDBObject(acText, true);
                    }
                }
                tr.Commit();
            }
        }

有什么解决办法吗？

Answer 1

1. 如何访问圆心？
   答:
   Circle oCircle = tr.GetObject(id, OpenMode.ForRead) as Circle; var _centerPosition = oCircle.Center;

2. 如何获取hatch的属性？
   答:
   你需要改变
   来自 hatch.AppendLoop(HatchLoopTypes.Outermost, ids);
   到 hatch.AppendLoop(HatchLoopTypes.External, ids);

我修改了你的代码，它对我有用

public static void SelectCirclesToHatch()
    {
        var doc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
        var db = doc.Database;
        var ed = doc.Editor;
        var filter = new SelectionFilter(new[] { new TypedValue(0, "CIRCLE") });
        var selection = ed.GetSelection(filter);
        int vr = 1;
        if (selection.Status != PromptStatus.OK) { return; }

        using (var tr = db.TransactionManager.StartTransaction())
        {
            var curSpace = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
            foreach (var id in selection.Value.GetObjectIds())
            {
                try
                {
                    var ids = new ObjectIdCollection(new[] { id });
                    using (var hatch = new Hatch())
                    {
                        curSpace.AppendEntity(hatch);
                        tr.AddNewlyCreatedDBObject(hatch, true);
                        hatch.SetHatchPattern(HatchPatternType.PreDefined, "ANSI31");
                        hatch.Associative = true;
                        hatch.AppendLoop(HatchLoopTypes.External, ids);
                        hatch.EvaluateHatch(true);
                        hatch.HatchStyle = HatchStyle.Normal;

                        Circle oCircle = tr.GetObject(id, OpenMode.ForRead) as Circle;
                        var _centerPosition = oCircle.Center;

                        DBText acText = new DBText();
                        acText.Position = _centerPosition;

                        acText.TextString = hatch.Area.ToString(); // Area of hatch
                        acText.Height = 0.5;
                        curSpace.AppendEntity(acText);
                        tr.AddNewlyCreatedDBObject(acText, true);
                    }
                }
                catch { }
            }
            tr.Commit();
        }
    }