pBlockTableRecord.ObjectId); acBlkTblRec.AppendEntity(bref2);
acTrans.AddNewlyCreatedDBObject(bref2, true); acTrans.Commit(); } }
4.2创建带有属性的块定义及插入带有属性的块参照 4.2.1 创建带有属性的块定义
→创建一个名为“三角点”的带属性块的记录，包括以下实体：
? 一个点 ? 一个圆 ? 一个三角形
? 一个名为三角点的属性
代码：
#region 创建带属性的块
[CommandMethod(\)] public void CreateAtrrBlock() {
Database acCurDb = pDoc.Database;
using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction()) {
BlockTable acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForWrite) as BlockTable;
BlockTableRecord acBlkTblRec = new BlockTableRecord(); string blkname = \三角点\; acBlkTblRec.Name = blkname;
acBlkTblRec.Origin = new Point3d(0, 0, 0); Point3d pCenter = new Point3d(0, 0, 0); //创建中心点
DBPoint pDBPt = new DBPoint(pCenter);
45
//创建圆
Circle pCir = new Circle(pCenter, new Vector3d(0, 0, 1), 0.25); //创建三角形
Polyline pTri = new Polyline(4);
pTri.AddVertexAt(0, new Point2d(0, 1), 0, 0, 0); pTri.AddVertexAt(1, new Point2d(0.866, -0.5), 0, 0, 0); pTri.AddVertexAt(2, new Point2d(-0.866, -0.5), 0, 0, 0); pTri.AddVertexAt(3, new Point2d(0, 1), 0, 0, 0); Polyline pPl = new Polyline(2);
pPl.AddVertexAt(0, new Point2d(0.9, 0), 0, 0, 0); pPl.AddVertexAt(1, new Point2d(4.5, 0), 0, 0, 0); //定义属性
Point3d pPosition = new Point3d(1, 0.2, 0);
AttributeDefinition pAtrDef = new AttributeDefinition(pPosition, \洼地\, \三角点名\, \输入三角点名\, acCurDb.Textstyle); pAtrDef.Height = 1;
Point3d pPosition2 = new Point3d(1, -1.2, 0);
AttributeDefinition pHVaue = new AttributeDefinition(pPosition2, \, \高程值\, \输入高程值\, acCurDb.Textstyle); pHVaue.Height = 1; //给定块的原点
acBlkTblRec.Origin = new Point3d(0, 0, 0); //将图形实体添加到块表记录 acBlkTblRec.AppendEntity(pDBPt); acBlkTblRec.AppendEntity(pCir); acBlkTblRec.AppendEntity(pTri); acBlkTblRec.AppendEntity(pPl); acBlkTblRec.AppendEntity(pAtrDef); acBlkTblRec.AppendEntity(pHVaue); //将块记录添加到块表 acBlkTbl.Add(acBlkTblRec);
acTrans.AddNewlyCreatedDBObject(acBlkTblRec, true);
// CreateBlockIcon cbi = new CreateBlockIcon(acBlkTblRec.Name); acTrans.Commit(); } }
#endregion
→使用AutoCAD插入块命令浏览及插入上述定义的块
46
4.2.2 插入带有属性的块参照
→打开块表BlockTable找到名为三角点的带属性的块表记录，创建块引用插入到当前活动块表记录中
代码：
#region 插入带属性的块
[CommandMethod(\)] public void InsertAtrrBlock() {
Database acCurDb = pDoc.Database;
using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction()) {
BlockTable acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForRead) as BlockTable;
BlockTableRecord acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord. ModelSpace],OpenMode.ForWrite) as BlockTableRecord; BlockTableRecord pBlockTableRecord = acTrans.GetObject( acBlkTbl[\三角点\], OpenMode.ForRead) as BlockTableRecord; BlockReference bref = new BlockReference(new Point3d(10, 10, 0), pBlockTableRecord.ObjectId); acBlkTblRec.AppendEntity(bref);
acTrans.AddNewlyCreatedDBObject(bref, true); foreach (ObjectId id in pBlockTableRecord) {
Entity ent = (Entity)acTrans.GetObject(id, OpenMode.ForRead, false); //打开当前的对象!
47
if (ent is AttributeDefinition) {
AttributeReference attRef = new AttributeReference(); AttributeDefinition attDef = (AttributeDefinition)ent; attRef.SetPropertiesFrom(attDef); attRef.Height = attDef.Height; attRef.Rotation = attDef.Rotation; attRef.Tag = attDef.Tag; if (attDef.Tag == \三角点名\) {
attRef.Position = new Point3d(11.3, 10.3, 0); attRef.TextString = \洼地\; }
else if (attDef.Tag == \高程值\) {
attRef.Position = new Point3d(11, 8.8, 0); attRef.TextString = \; }
if (!bref.IsWriteEnabled) {
bref.UpgradeOpen(); }
bref.AttributeCollection.AppendAttribute(attRef); //通知事务处理添加新创建的属性参照
acTrans.AddNewlyCreatedDBObject(attRef, true); } }
acTrans.Commit(); } }
#endregion
48
实验四 用户交互、选择集及扩展属性
一、主要内容
1、基于用户交互式的信息输入 2、创建选择集
3、给图形实体添加扩展属性
二、学时安排：2学时 三、预习内容
回顾用户交互命令的使用、选择集创建的几种方式，
四、实验步骤
引用：
using System;
using System.Collections.Generic; using System.Linq; using System.Text;
using System.Threading.Tasks;
using Autodesk.AutoCAD.ApplicationServices; using Autodesk.AutoCAD.Runtime; using Autodesk.AutoCAD.EditorInput; using Autodesk.AutoCAD.DatabaseServices; using Autodesk.AutoCAD.Geometry; using System.IO;
[assembly: CommandClass(typeof(实验四.UserInteraction))] namespace 实验四 {
public class UserInteraction { } }
4.1 用户交互
代码：
49