文字左对齐（C#）

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.GraphicsInterface;
using Autodesk.AutoCAD.Geometry;

namespace TextAlign
{
    public class Class1
    {
        [CommandMethod("TextAl")]
        public static void TextAlignmentType()
        {
            Document doc = Application.DocumentManager.MdiActiveDocument;
            Database db = doc.Database;
            Editor ed = doc.Editor;
            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                // Create a TypedValue array to define the filter criteria
                TypedValue[] acTypValAr = new TypedValue[1];
                acTypValAr.SetValue(new TypedValue((int)DxfCode.Start, "TEXT"), 0);
                // Assign the filter criteria to a SelectionFilter object
                SelectionFilter acSelFtr = new SelectionFilter(acTypValAr);

                PromptSelectionResult acSSPrompt = doc.Editor.GetSelection(acSelFtr);
                if (acSSPrompt.Status == PromptStatus.OK)
                {
                    SelectionSet acSSet = acSSPrompt.Value;
                    DBText ent = tr.GetObject(acSSet[0].ObjectId, OpenMode.ForRead) as DBText;
                    double dblOrigX = ent.Position.X;
                    double dblOrigY = ent.Position.Y;
                    double dblOrigZ = ent.Position.Z;
                    Point3d acOrigPoint = new Point3d(dblOrigX, dblOrigY, dblOrigZ);
                    double dblTextSize = ent.Height * 1.6;
                    int intSSLength = acSSet.Count;
                    for (int intSSCount = 1; intSSCount < intSSLength; intSSCount++)
                    {
                        DBText entModText = tr.GetObject(acSSet[intSSCount].ObjectId, OpenMode.ForWrite) as DBText;
                        double dbOldX = entModText.Position.X;
                        double dbOldY = entModText.Position.Y;
                        double dbOldZ = entModText.Position.Z;
                        Point3d acOldPoint = new Point3d(dbOldX, dbOldY, dbOldZ);
                        double dblTextGap = intSSCount * dblTextSize;
                        double dbNewX = dblOrigX;
                        double dbNewY = dblOrigY - dblTextGap;
                        double dbNewZ = dblOrigZ;
                        Point3d acNewPoint = new Point3d(dbNewX, dbNewY, dbNewZ);
                        Vector3d acVector = acOldPoint.GetVectorTo(acNewPoint);
                        BlockTable acBlkTbl = tr.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
                        BlockTableRecord acBlkTblRec = tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;
                        entModText.TransformBy(Matrix3d.Displacement(acVector));
                    }
                    tr.Commit();
                }
            }
        }
    }
}