ObjectARX C++自定义实体

实现流程

首先创建一个继承自AcDbEntity的自定义实体类，重写几个虚函数方法：

.从AcDbEntity类中重载几个必须的虚函数：

  virtual Adesk::Boolean worldDraw(AcGiWorldDraw* mode);virtual Acad::ErrorStatus dwgInFields(AcDbDwgFiler*);
virtual Acad::ErrorStatus dwgOutFields(AcDbDwgFiler*) const;virtual Acad::ErrorStatus getGripPoints(AcGePoint3dArray& gripPoints,AcDbIntArray&osnapModes,AcDbIntArray& geomIds) const;virtual Acad::ErrorStatus moveGripPointsAt(const AcDbIntArray& indices,const AcGeVector3d& offset);

在dwgInFields函数的开始处必须有：

assertWriteEnabled();
AcDbObject::dwgInFields(pFiler);
if(pFiler->filerType()==AcDb::kWblockCloneFiler)
{AcDbHardPointerId Id;pFiler->readItem(&Id);
}

在dwgOutFields函数的开始处必须有：

assertReadEnabled();
AcDbObject::dwgOutFields(pFiler);
if (pFiler->filerType()==AcDb::kWblockCloneFiler)
pFiler->writeHardPointerId((AcDbHardPointerId)ownerId());

在InitApplication()函数中添加:

EntTest::rxInit();
acrxBuildClassHierarchy();

下面是一个例子：

#if !defined(AFX_ACDBENTITYTEST_H__E622CCB1_4E1D_4985_8813_0CEE3BF4ED20__INCLUDED_)
#define AFX_ACDBENTITYTEST_H__E622CCB1_4E1D_4985_8813_0CEE3BF4ED20__INCLUDED_#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#include "stdafx.h"
#include "stdarx.h"
#include "acadstrc.h"
#include "geassign.h"
#include "acedads.h"
#include "math.h"
#include <fstream.h>class AcdbEntityTest:public AcDbEntity
{
public:ACRX_DECLARE_MEMBERS(AcdbEntityTest);AcdbEntityTest();virtual ~AcdbEntityTest();virtual void Initialize();//自定义实体必须重载的函数----------------------------------------------------virtual Adesk::Boolean worldDraw(AcGiWorldDraw* mode);virtual Acad::ErrorStatus dwgInFields(AcDbDwgFiler*);virtual Acad::ErrorStatus dwgOutFields(AcDbDwgFiler*) const;virtual Acad::ErrorStatus getGripPoints(AcGePoint3dArray& gripPoints,AcDbIntArray& osnapModes,AcDbIntArray& geomIds) const;virtual Acad::ErrorStatus moveGripPointsAt(const AcDbIntArray& indices,const AcGeVector3d& offset);virtual Acad::ErrorStatus getOsnapPoints(AcDb::OsnapMode   osnapMode,int               gsSelectionMark,const AcGePoint3d&    pickPoint,const AcGePoint3d&    lastPoint,const AcGeMatrix3d&   viewXform,AcGePoint3dArray& snapPoints,AcDbIntArray&     geomIds) const ;private:AcGePoint3d StartPoint;AcGePoint3d EndPoint;
};
#endif // !defined(AFX_ACDBENTITYTEST_H__E622CCB1_4E1D_4985_8813_0CEE3BF4ED20__INCLUDED_)cpp:#include "stdafx.h"
#include "stdarx.h"
#include "Resource.h"
#include "acadstrc.h"
#include "geassign.h"
#include "acedads.h"
#include "math.h"
#include <fstream.h>
#include "AcdbEntityTest.h"
#include "global.h"ACRX_DXF_DEFINE_MEMBERS(AcdbEntityTest, AcDbEntity,AcDb::kDHL_CURRENT, AcDb::kMReleaseCurrent,0,EntityDIM,"autoCAD");
MAKE_ACDBOPENOBJECT_FUNCTION(AcdbEntityTest);#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif//
// Construction/Destruction
//AcdbEntityTest::AcdbEntityTest()
{abarx=new AboutArx();
}AcdbEntityTest::~AcdbEntityTest()
{}
Acad::ErrorStatus AcdbEntityTest::dwgInFields(AcDbDwgFiler* pFiler)
{assertWriteEnabled();AcDbObject::dwgInFields(pFiler);if(pFiler->filerType()==AcDb::kWblockCloneFiler){AcDbHardPointerId Id;pFiler->readItem(&Id);  }pFiler->readItem(&StartPoint);pFiler->readItem(&EndPoint);return pFiler->filerStatus();
}
Acad::ErrorStatus AcdbEntityTest::dwgOutFields(AcDbDwgFiler* pFiler) const
{assertReadEnabled();AcDbObject::dwgOutFields(pFiler);if (pFiler->filerType()==AcDb::kWblockCloneFiler){pFiler->writeHardPointerId((AcDbHardPointerId)ownerId());}pFiler->writeItem(StartPoint);pFiler->writeItem(EndPoint);return pFiler->filerStatus();
}Adesk::Boolean  AcdbEntityTest::worldDraw(AcGiWorldDraw* pWd)
{AcDbObjectId originalLineTypeID;originalLineTypeID=pWd->subEntityTraits().lineTypeId();Adesk::UInt16 originalColor;originalColor=pWd->subEntityTraits().color();//获取虚线线型IDAcad::ErrorStatus err;AcDbObjectId dashId;AcDbLinetypeTable*pLinetypeTable;acdbHostApplicationServices()->workingDatabase()->loadLineTypeFile("ACAD_ISO02W100","acadiso.lin");acdbHostApplicationServices()->workingDatabase()->getLinetypeTable(pLinetypeTable,AcDb::kForRead);err=pLinetypeTable->getAt("ACAD_ISO02W100",dashId,Adesk::kTrue);pLinetypeTable->close();pWd->subEntityTraits().setLineType(originalLineTypeID);  pWd->subEntityTraits().setColor(1);AcGePoint3d Verts[2];Verts[0]=StartPoint;Verts[1]=EndPoint;pWd->geometry().polyline(2,Verts);return AcDbEntity::worldDraw(pWd);
}
Acad::ErrorStatus AcdbEntityTest::getGripPoints(AcGePoint3dArray& gripPoints,AcDbIntArray& osnapModes,AcDbIntArray& geomIds)const
{assertReadEnabled();gripPoints.append(StartPoint);gripPoints.append(EndPoint);return Acad::eOk;
}
Acad::ErrorStatus AcdbEntityTest::moveGripPointsAt(const AcDbIntArray& indices,const AcGeVector3d& offset)
{assertReadEnabled();Acad::ErrorStatus es=Acad::eOk;if(indices.length()==0){return Acad::eOk;}int num=indices.length();for(int i=0;i<num;i++){int k=indices[i];if (k==0){StartPoint.x+=offset.x;StartPoint.y+=offset.y;}else{EndPoint.x+=offset.x;EndPoint.y+=offset.y; }}return Acad::eOk;
}Acad::ErrorStatus AcdbEntityTest::getOsnapPoints(AcDb::OsnapMode   osnapMode,int   gsSelectionMark,const AcGePoint3d&    pickPoint,const AcGePoint3d&    lastPoint,const AcGeMatrix3d&   viewXform,AcGePoint3dArray& snapPoints,AcDbIntArray&     geomIds) const
{   //设置捕捉点assertReadEnabled();Acad::ErrorStatus es=Acad::eOk;if(osnapMode!=AcDb::kOsModeEnd){return Acad::eOk;}return Acad::eOk;
}void AcdbEntityTest::Initialize()
{AcGePoint3d inputPt;if(ads_getpoint(NULL,"/n ==NOTE== 请输入起点: ",asDblArray(inputPt))!=RTNORM){ads_printf("/n ==NOTE== 错误");}StartPoint=inputPt;AcDbObjectId entityID=AddEntityToDbs(this);int track,type;track=1;struct resbuf entdata;while (track>0){if(ads_grread (track, &type, &entdata)!=RTNORM){ads_printf("/n !=RTNORM");break;}AcdbEntityTest * pmyEntity=this;acdbOpenObject(pmyEntity,entityID, AcDb::kForWrite);this->assertWriteEnabled();if(type==5){AcGePoint3d movePt;    //鼠标当前位置movePt[X]=entdata.resval.rpoint[X];movePt[Y]=entdata.resval.rpoint[Y];EndPoint=movePt;this->close();}if(type==3){track=1;AcGePoint3d movePt;    //鼠标当前位置movePt[X]=entdata.resval.rpoint[X];movePt[Y]=entdata.resval.rpoint[Y];EndPoint=movePt;this->close();break;}if(type==13){//鼠标右键退出track=1;AcGePoint3d movePt;  //鼠标当前位置movePt[X]=entdata.resval.rpoint[X];movePt[Y]=entdata.resval.rpoint[Y];EndPoint=movePt;this->close(); break;}}
}AcDbObjectId AboutArx::AddEntityToDbs(AcDbEntity*pEnt)//将生成的自定义实体对象加入CAD数据库
{AcDbBlockTable *bt;acDocManager->lockDocument(acDocManager->curDocument(),AcAp::kWrite);AcDbObjectId entityId;acdbCurDwg()->getBlockTable(bt,AcDb::kForRead);AcDbBlockTableRecord *btr;bt->getAt(ACDB_MODEL_SPACE,btr,AcDb::kForWrite);bt->close();btr->appendAcDbEntity(entityId,pEnt);pEnt->close();btr->close();return entityId;
}

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