CAD开发中的文本对齐问题

2023-11-22 11:36| 来源: 网络整理| 查看: 265

DBText有两个属性用于确定文本位置，AlignmentPoint（对齐点）和 Position（位置）

方法 Justify（对齐方式）用于确定文本对齐方式，当 Justify 发生变化时，Position 会随之变化，AlignmentPoint 则保持不变

开发过程中，我们一般会指定文本的 AlignmentPoint 和 Justify，而不会麻烦的去计算 Position，这时候可以用 DBText.AdjustAlignment(Database) 方法来自动更新 Position，正常情况下使用没毛病，但在新建数据库里使用就不行

查资料发现这里作为参数的 Database 必须是当前活动数据库，否则该方法无效

重点来了：

DBText dbText = new DBText(); dbText.SetDatabaseDefaults(db); Database prevWorkingDb = HostApplicationServices.WorkingDatabase; HostApplicationServices.WorkingDatabase = db; dbText.AdjustAlignment(db); HostApplicationServices.WorkingDatabase = prevWorkingDb;

这里面除了切换当前活动数据库是关键外，dbText.SetDatabaseDefaults(db)也是必要的，具体原因还没来得及深究

以下是外网上找的代码：

public void TextAlign() { Document activeDoc = Application.DocumentManager.MdiActiveDocument; // For adding a text with alignment to the current document bool isInMemory = false; Database db = activeDoc.Database; // For adding a text to an in-memory database //bool isInMemory = true; //Database db = new Database(true, false); using (Transaction tr = db.TransactionManager.StartTransaction()) { BlockTable bt = tr.GetObject( db.BlockTableId, OpenMode.ForRead ) as BlockTable; BlockTableRecord mSpace = tr.GetObject ( bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite ) as BlockTableRecord; DBText dbText = new DBText(); dbText.SetDatabaseDefaults(db); dbText.Position = Point3d.Origin; dbText.Height = 5.0; dbText.TextString = "Autodesk"; dbText.HorizontalMode = TextHorizontalMode.TextRight; dbText.AlignmentPoint = Point3d.Origin; if (isInMemory) { // For adding a text with an alignment to an in-memory database // set the working database before using AdjustAlignment Database prevWorkingDb = HostApplicationServices.WorkingDatabase; HostApplicationServices.WorkingDatabase = db; dbText.AdjustAlignment(db); HostApplicationServices.WorkingDatabase = prevWorkingDb; } else { // For adding a text with alignment to the current document // working database is already set dbText.AdjustAlignment(db); } mSpace.AppendEntity(dbText); tr.AddNewlyCreatedDBObject(dbText, true); tr.Commit(); } if (isInMemory) { db.SaveAs("C:\\Temp\\Test.dwg", DwgVersion.Current); db.Dispose(); } }

代码来自：https://adndevblog.typepad.com/autocad/2012/06/updating-text-alignment-.html

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