CAD二次实验报告

CAD开发实验（四）

实验三AutoCAD图形块的创建与应用

一、主要内容

1、创建块定义及插入块参照

2、创建带有属性的块定义及插入带有属性的块参照

3、在对话框中查看块定义的图标

4、在当前文件中插入外部文件中的块

5、在当前文件中插入其他DWG文件

二、学时安排：2学时

三、预习内容

理解块的含义，回顾块和带属性块的定义

四、AutoCAD图形块的创建与应用

4.1创建块定义及插入块参照

4.1.1创建块定义

代码：创建块

publicDocumentpDoc=

XXXXXXXXX;

[CommandMethod("CreateBlock")]

publicvoidCreateBlock()

{DatabaseacCurDb=XXX;

using(TransactionacTrans=XXX.StartTransaction()){BlockTableacBlkTbl=XXX(XXX,XXX)asBlockTable;创建新的块表记录

BlockTableRecordacBlkTblRec=newBlockTableRecord();stringblkname="三角点";

XXX;

XXX(0,0,0);

Point3dpCenter=newPoint3d(0,0,0);

创建中心点

DBPointpDBPt=newDBPoint(pCenter);

创建圆

CirclepCir=newCircle(pCenter,newVector3d(0,0,1),0.25);创建三角形

PolylinepTri=newPolyline(4);

XXX(0,newPoint2d(0,1),0,0,0);

XXX(1,newPoint2d(0.866,-0.5),0,0,0);XXX(2,newPoint2d(-0.866,-0.5),0,0,0);XXX(3,newPoint2d(0,1),0,0,0);

给定块的原点

XXX

(0,0,0);

将图形实体添加到块表记录

acBlkTbXXX(pDBPt);

acBlkTbXXX(pCir);

acBlkTbXXX(pTri);

将块记录添加到块表

XXX(acBlkTblRec);

XXX(acBlkTblRec,true);

提交修改并销毁事务

XXX();

4.1.2插入卡块参照

代码：插入块

[CommandMethod("InsertBlock")]

publicvoidInsertBlock()

DatabaseacCurDb=XXX;

启动一个事务Startatransaction

using(TransactionacTrans=acCurDXXX.StartTransaction()){

BlockTableacBlkTbl=XXX(

XXX,XXX)asBlockTable;

以写方式打开模型空间块表记录

BlockTableRecordacBlkTblRec=XXX(

acBlkTbl[XXX,XXX)asBlockTableRecord;

获取三角点块，并创建块引用

BlockTableRecordpBlockTableRecord=XXX(

acBlkTbl["三角点"],XXX)asBlockTableRecord;

BlockReferencebref=newBlockReference(

newPoint3d(10,10,0),XXX);

BlockReferencebref2=newBlockReference(

newPoint3d(30,30,0),XXX);

XXX(bref2);

XXX(bref2,true);XXX();

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：

一个三角形

一个名为三角点的属性

代码：region创建带属性的块

[CommandMethod("CreateAtrrBlock")]

publicvoidCreateAtrrBlock()

{DatabaseacCurDb=XXX;

using(TransactionacTrans=XXX.StartTransaction()){BlockTableacBlkTbl=XXX(XXX,

XXX)asBlockTable;BlockTableRecordacBlkTblRec=newBlockTableRecord();

stringblkname="三角点";

XXX;

XXX(0,0,0);

Point3dpCenter=newPoint3d(0,0,0);

创建中心点

DBPointpDBPt=newDBPoint(pCenter);

创建圆

CirclepCir=newCircle(pCenter,newVector3d(0,0,1),0.25);创建三角形

PolylinepTri=newPolyline(4);

XXX(0,newPoint2d(0,1),0,0,0);

XXX(1,newPoint2d(0.866,-0.5),0,0,0);

XXX(2,newPoint2d(-0.866,-0.5),0,0,0);

XXX(3,newPoint2d(0,1),0,0,0);

PolylinepPl=newPolyline

(2);

XXXAt(0,newPoint2d(0.9,0),0,0,0);

XXX(1,newPoint2d(4.5,0),0,0,0);

定义属性

Point3dpPosition=newPoint3d(1,0.2,0);

AttributeDefinitionpAtrDef=newAttributeDefinition(

pPosition,"洼地","三角点名","输入三角点名",XXX);

XXX;

Point3dpPosition2=newPoint3d(1,-1.2,0);

AttributeDefinitionpHVaue=newAttributeDefinition(

pPosition2,"0.00","高程值","输入高程值",XXX);XXX;

给定块的原点

XXX(0,0,0);

将图形实体添加到块表记录

XXX(pDBPt);

XXX(pCir);

XXX(pTri);

XXX(pPl);

XXX(pAtrDef);

XXX(pHVaue);

将块记录添加到块表

XXX(acBlkTblRec);

XXX(acBlkTblRec,true);

CreateBlockIconcbi=newCreateBlockIcon(XXX);

XXX();

endregion

4.2.2插入带有属性的块参照

region插入带属性的块

[CommandMethod("InsertAtrrBlock")]

publicvoidInsertAtrrBlock()

DatabaseacCurDb=XXX;

using(TransactionacTrans=XXX.StartTransaction()){

BlockTableacBlkTbl=XXX(XXX,

XXX)asBlockTable;

BlockTableRecordacBlkTblRec=

acTranXXX(acBlkTbl[XXX,

XXX)asBlockTableRecord;BlockTableRecordpBlockTableRecord=acTranXXX(

acBlkTbl["三角点"],XXX)as

BlockTableRecord;

BlockReferencebref=newBlockReference(

newPoint3d(10,10,0),XXX);XXX(bref);

XXX(bref,true);

foreach(ObjectIdidinpBlockTableRecord)

Entityent=(Entity)XXX(id,XXX,false);打开当前的对象!

if(entisAttributeDefinition)

AttributeReferenceattRef=newAttributeReference();

AttributeDefinitionattDef=(AttributeDefinition)ent;

XXX(attDef);

XXX.Height;

XXX.Rotation;

XXX.Tag;

if(XXX"三角点名")

XXX(11.3,10.3,0);

XXXtString="洼地";

elseif(XXX"高程值")

XXX(11,8.8,0);

XXX"65.99";

if(!XXX)

XXX();

XXX.AppendAttribute(attRef);

通知事务处理添加新创建的属性参照

XXX(attRef,true);

XXX();

endregion

4.3在对话框中查看块定义的图标

代码：[CommandMethod("ViewBlock")]

publicvoidViewBlock()

{ViewBlockfrmpViewBlockfrm=newViewBlockfrm();XXX;

XXX();