Teigha.TD OdDbLine 虚线创建教程：使用 C# 代码创建虚线

"Teigha.TD OdDbLine 虚线参数可以通过设置 OdDbLineType 枚举类型的值来实现虚线效果。可以使用以下步骤来创建一个虚线：\n\n1. 创建一个 OdDbLine 对象。\n2. 设置线的起点和终点。\n3. 创建一个 OdDbLinetypeTableRecord 对象，并设置其名称为 "DOT"。\n4. 获取当前数据库的 Linetype 表。\n5. 检查 Linetype 表中是否已存在名称为 "DOT" 的 Linetype 记录，如果不存在则创建一个新的记录。\n6. 设置 Linetype 记录的 Pattern 字段为 "-. -."，这将定义一个虚线的模式。\n7. 将 Linetype 记录添加到 Linetype 表中。\n8. 将线的 Linetype 设置为 "DOT"。\n9. 将线添加到数据库中。\n\n以下是一个使用 Teigha.TD OdDbLine 类创建虚线的示例代码：\n\ncsharp\nusing Teigha.DatabaseServices;\nusing Teigha.Runtime;\n\npublic class DashedLineExample\n{\n [CommandMethod(\"DashedLine\")]\n public void CreateDashedLine()\n {\n using (Database db = new Database())\n {\n using (Transaction tr = db.TransactionManager.StartTransaction())\n {\n // 创建线\n Line line = new Line(new Point3d(0, 0, 0), new Point3d(10, 0, 0));\n\n // 创建 Linetype 记录\n LinetypeTableRecord linetypeRecord = null;\n LinetypeTable linetypeTable = tr.GetObject(db.LinetypeTableId, OpenMode.ForRead) as LinetypeTable;\n if (!linetypeTable.Has(\"DOT\"))\n {\n linetypeRecord = new LinetypeTableRecord();\n linetypeRecord.Name = \"DOT\";\n linetypeRecord.Comments = \"Dashed Line\";\n linetypeRecord.PatternLength = 0.5;\n linetypeRecord.NumDashes = 2;\n linetypeRecord.SetDashLengthAt(0, 0.25);\n linetypeRecord.SetDashLengthAt(1, 0.25);\n linetypeTable.UpgradeOpen();\n linetypeTable.Add(linetypeRecord);\n tr.AddNewlyCreatedDBObject(linetypeRecord, true);\n }\n else\n {\n linetypeRecord = tr.GetObject(linetypeTable[\"DOT\"], OpenMode.ForWrite) as LinetypeTableRecord;\n }\n\n // 设置线的 Linetype\n line.Linetype = linetypeRecord.ObjectId;\n\n // 将线添加到数据库\n BlockTable blockTable = tr.GetObject(db.BlockTableId, OpenMode.ForWrite) as BlockTable;\n BlockTableRecord modelSpace = tr.GetObject(blockTable[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;\n modelSpace.AppendEntity(line);\n tr.AddNewlyCreatedDBObject(line, true);\n\n tr.Commit();\n }\n }\n }\n}\n\n\n这将在 AutoCAD 中创建一个起点为 (0, 0, 0)、终点为 (10, 0, 0) 的虚线。\n