ARX函数

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ARX函数

选择指定图层上的所有实体

Acad::ErrorStatus selectEntityInLayer(const char* nLayerName,AcDbObjectIdArray& nIDs)
{
Acad::ErrorStatus es = Acad::eOk;

ads_name ents;
struct resbuf *rb;
rb=acutNewRb(AcDb::kDxfLayerName);
rb->restype=8;
rb->resval.rstring=(char*)nLayerName;
rb->rbnext=NULL;
acedSSGet("X",NULL,NULL,rb,ents);
long entNums=0;
acedSSLength(ents,&entNums);
if (entNums == 0)
es = Acad::eInvalidInput;
else
{
for (long a = 0; a < entNums ; a ++)
{
   AcDbObjectId objId;
   ads_name      ent;
   acedSSName(ents,a,ent);
   acdbGetObjectId(objId, ent);
   nIDs.append(objId);
}
}
acedSSFree(ents);
acutRelRb(rb);

return es;
}
设置当前层

Acad::ErrorStatus SetCurLayer(const char* lpLayerName, AcDbDatabase* pDb/* = NULL */)
{
AcDbDatabase* pCurDb = pDb;
if (pCurDb == NULL)
pCurDb = acdbHostApplicationServices()->workingDatabase();

AcDbLayerTableRecordPointer spRecord(lpLayerName, pCurDb, AcDb::kForRead);
Acad::ErrorStatus es = spRecord.openStatus();
if (es == Acad::eOk)
{
es = pCurDb->setClayer(spRecord->objectId());
}
return es;
}
生成新组

//生成新组(sGroupName)
//追加数组中所有实体到该组中
//组名字 , Id数组
int createGroup(CString sGroupName,
const AcDbObjectIdArray *idArr)
{
AcDbGroup *pGroup = new AcDbGroup((LPSTR)(LPCTSTR)sGroupName);
AcDbObjectId groupObjectId;
AcDbDictionary *pGroupDict = NULL;

acdbHostApplicationServices()->workingDatabase()
->getGroupDictionary(pGroupDict, AcDb::kForWrite);
pGroupDict->setAt(sGroupName, pGroup, groupObjectId);
pGroupDict->close();
pGroup->close();
acdbOpenObject(pGroup, groupObjectId, AcDb::kForWrite);
for (int i = 0; i < idArr->length(); i++)
{
groupObjectId = idArr->at(i);
pGroup->append(groupObjectId);
}
pGroup->close();
return TRUE;
}
建立文本格式表函数

AcDbObjectId CreateNewTextStyle()
{
AcDbTextStyleTable *pTextStyleTable;
AcDbTextStyleTableRecord *pTextStyleTableRcd
AcDbObjectId textId;
acdbHostApplicationServices()->workingDatabase()->getSymbolTable (pTextStyleTable,AcDb::kForWrite);

if (!pTextStyleTable->has(StyleName)
{
AcDbTextStyleTableRecord *pTSTblRcd= new AcDbTextStyleTableRecord;
pTSTblRcd->setName(StyleName);
pTSTblRcd->setFileName(fontName);
pTSTblRcd->setBigFontFileName(bigfontName);
pTSTblRcd->setTextSize(textSize);
pTSTblRcd->setXScale(xScale);
pTSTblRcd->setObliquingAngle(obliqueAngle);
pTSTblRcd->setPriorSize(trPercent);
pTextStyleTable->add(textId,pTextStyleTableRcd);
pTSTblRcd->close();
}
pTextStyleTable->close();
return textId;

}
区域在区域内

// Function name : RgnInRgn
// Descrīption : is Region1 in Region2?
// Return type : bool
// Argument : const AcDbRegion* pRegion1
// Argument : const AcDbRegion* pRegion2
bool RgnInRgn(const AcDbRegion* pRegion1,const AcDbRegion* pRegion2)
{
if (pRegion1==NULL||pRegion2==NULL) return false;

AcDbObjectPointer< AcDbRegion > spRegion1;
AcDbObjectPointer< AcDbRegion > spRegion2;
if (spRegion1.create()!=Acad::eOk)
{
acdbFail("\n内存不足");
return false;
}
if (spRegion2.create()!=Acad::eOk)
{
acdbFail("\n内存不足");
return false;
}

if ((spRegion1->copyFrom(pRegion1)!= Acad::eOk)||
(spRegion2->copyFrom(pRegion2)!= Acad::eOk))
{
acdbFail("\n无法复制对象");
return false;
}

bool bResult=false;
if(spRegion1->booleanOper(AcDb::kBoolIntersect, spRegion2.object()) == Acad::eOk)
{
if ((spRegion2->isNull()==Adesk::kTrue)&&(spRegion1->isNull()!=Adesk::kTrue)){
   double area1,area0;
   spRegion1->getArea(area1);
   pRegion1->getArea(area0);

if ((area0 - area1) < AcGeContext::gTol.equalPoint())
bResult=true;
}
}

return bResult;
}
组旋转

void CMyDatabase::rotationGroup(CString strGroupName ,CReiPoint ptRotation,double rotationAngle)
{
AcGePoint3d pt;
AcDbDictionary *pGroupDict;
acdbCurDwg()->getGroupDictionary(pGroupDict,AcDb::kForWrite);
AcDbObjectId groupId;
AcDbGroup *pGroup;
pt.x=ptRotation.x;
pt.y=ptRotation.y;
pt.z=ptRotation.z;
if(pGroupDict->getAt(strGroupName,groupId)==Acad::eOk)
acdbOpenObject(pGroup,groupId,AcDb::kForWrite);
else
{
pGroupDict->close();
return;
}
pGroupDict->close();
AcDbGroupIterator* pIter=pGroup->newIterator();
AcDbEntity* pEnt;
AcDbObjectId objId;
pIter=pGroup->newIterator();
for(;!pIter->done();pIter->next())
{
ōbjId=pIter->objectId();
acdbOpenAcDbEntity(pEnt,objId,AcDb::kForWrite);
rotationEntity(pEnt,pt,rotationAngle);
pEnt->close();
}
delete pIter;
pGroup->close();
}
点在区域内

功能：判断点 pt是否在区域 ptArr内
实现：根据射线法求交点个数，偶数－区域外，奇数－区域内
变量：pt指定点 ptArr判断区域
返回：在区域 TRUE不在 FALSE

code: BOOL BaseHandle::PointIsInPolygon(AcGePoint3d pt, AcGePoint3dArray ptArr)
{
int ptNum,i,interNum;
AcGePoint3d ptA,ptB;
ads_point pt0,pt1,pt2,ptIns,ptX;

interNum = 0;
pt0[X] = 0.0;
pt0[Y] = 0.0;
pt0[Z] = 0.0;
ptX[X] = pt.x;
ptX[Y] = pt.y;
ptX[Z] = pt.z;
ptNum = ptArr.length();
for (i = 0;i < ptNum - 1;i++){
   ptA = ptArr.at(i);
   ptB = ptArr.at(i + 1);
   pt1[X] = ptA.x;
   pt1[Y] = ptA.y;
   pt1[Z] = 0.0;
   pt2[X] = ptB.x;
   pt2[Y] = ptB.y;
   pt2[Z] = 0.0;
   if (acdbInters(ptX,pt0,pt1,pt2,1,ptIns) == RTNORM){
    interNum++;
   }
}
if (interNum % 2 == 0){
   return false;
}else{
   return true;
}

2008-05-29 13:58

/******************************************************************
函数名:         setView
功能:          设置视图（相当于Zoom Window命令）
输入参数:       Pt1 --视图左上角点
          Pt2 -- 视图右下角点
          ex_ratio -- 扩展比率,一般为1.0
输出参数:
返回值:         void
其它:
*****************************************************************/
void setView(AcGePoint2d Pt1, AcGePoint2d Pt2, double ex_ratio)
{
AcGePoint2d CenterPt;

//若X坐标或Y坐标重合，判为意外，不进行SetView操作
if ((fabs(Pt1.x-Pt2.x)<1e-6)||(fabs(Pt1.y-Pt2.y)<1e-6))
return;

//确保两个坐标点分别为左上角和右下角
if (Pt1.x>Pt2.x) {
double tmp;
tmp = Pt1.x;
Pt1.x = Pt2.x;
Pt2.x = tmp;
}
if (Pt2.y>Pt1.y) {
double tmp;
tmp = Pt1.y;
Pt1.y = Pt2.y;
Pt2.y = tmp;
}

//获取当前DwgView的尺寸
CRect CADrect;
acedGetAcadDwgView()->GetClientRect(&CADrect);

double width,height,ratio;

ratio = (double)(CADrect.right-CADrect.left)/(double)(CADrect.bottom-CADrect.top);

if (fabs(ratio)<1e-6)
return;

if ((Pt2.x-Pt1.x)/(Pt1.y-Pt2.y) > ratio) {
width = Pt2.x-Pt1.x;
height = width/ratio;
}else{
height = Pt1.y-Pt2.y;
width = height * ratio;
}

//设置当前视图中心点
CenterPt.x = (Pt1.x+Pt2.x)/2;
CenterPt.y = (Pt1.y+Pt2.y)/2;

//改变当前视图
AcDbViewTableRecord pVwRec;
pVwRec.setCenterPoint(CenterPt);
pVwRec.setWidth(width * ex_ratio);
pVwRec.setHeight(height * ex_ratio);
acedSetCurrentView( &pVwRec, NULL );
}

///////////////////////////////////////////////////////////////
//    函数名 : oxaGetVar
//    函数功能 :
//    处理过程 :
//    备  注 :
//    作  者 : user
//    时   间 : 2004年6月16日
//    返回值 : int
//    参数说明 : const CString strSym,
//                 AcGePoint3d &vOut
///////////////////////////////////////////////////////////////
int oxaGetVar(const CString strSym, AcGePoint3d &vOut )
{
   resbuf rbVar ;
   int iRt=acedGetVar(strSym, &rbVar) ;
   if (iRt!=RTNORM)
   {
       return iRt;
   }
   //oxaPrint(&rbVar);

if (rbVar.restype==RTPOINT)
   {
       vOut.x=rbVar.resval.rpoint[0];
       vOut.y=rbVar.resval.rpoint[1];
   }
   if (rbVar.restype==RT3DPOINT)
   {
       vOut.x=rbVar.resval.rpoint[0];
       vOut.y=rbVar.resval.rpoint[1];
       vOut.z=rbVar.resval.rpoint[2];
   }
return RTNORM;
}

int oxaGetVar(const CString strSym, int &vOut )
{
   resbuf rbVar;
   int iRt=acedGetVar(strSym, &rbVar) ;
   if (iRt!=RTNORM)
   {
       return iRt;
   }

if (rbVar.restype==RTLONG)
   {
       vOut=rbVar.resval.rlong;
   }
if (rbVar.restype==RTSHORT)
   {
       vOut=rbVar.resval.rint;
}

return RTNORM;
}

/////////////////////////////////////////////////////////////////////////////////
//# DOC.BEGIN
//# 函数名称： oxaGetVar
//# 函数编号： OXA
//# 函数声明：
//# 函数参数： const CString strSym,
//                 CString &vOut
//# 返回值：   int
//# 函数分类：
//# 函数功能：获取系统变量，封装acedGetVar()
//# 注意事项：
//# 涉及的全局变量：
//# 调用的OXARX函数：
//# 函数算法：
//# ACAD版本：R14 R15 R16
//# 配合函数：
//# 类似函数：
//# 替换函数：
//# 现存缺陷：
//# 示例程序：
//# 测试要求：
//# 历史记录： 2003年11月24日 , zjw ,完成
//
//# DOC.END
int oxaGetVar(const CString strSym, CString &vOut )
{
   resbuf rbVar;
   int iRt=acedGetVar(strSym, &rbVar) ;
   if (iRt!=RTNORM)
   {
       return iRt;
   }

if (rbVar.restype==RTSTR)
   {
       vOut=rbVar.resval.rstring;
   }
return RTNORM;
}
// 函数名   : SetCurTextStyle
// 描述     :设置当前TextStyle
// 返回     : Acad::ErrorStatus
// 参数       : const char* lpStyleName
// 参数       : AcDbDatabase* pDb/* = NULL */
Acad::ErrorStatus SetCurTextStyle(const char* lpStyleName, AcDbDatabase* pDb/* = NULL */)
{
AcDbDatabase* pCurDb = pDb;
if (pCurDb == NULL)
    pCurDb = acdbHostApplicationServices()->workingDatabase();

AcDbTextStyleTableRecordPointer spRecord(lpStyleName, pCurDb, AcDb::kForRead);
Acad::ErrorStatus es = spRecord.openStatus();
if (es == Acad::eOk)
{
    es = pCurDb->setTextstyle(spRecord->objectId());
}
return es;
}
// Function name   : SetCurLayer
// Descrīption     : 设置当前层
// Return type     : Acad::ErrorStatus
// Argument       : const char* lpLayerName
// Argument       : AcDbDatabase* pDb/* = NULL */
Acad::ErrorStatus SetCurLayer(const char* lpLayerName, AcDbDatabase* pDb/* = NULL */)
{
AcDbDatabase* pCurDb = pDb;
if (pCurDb == NULL)
    pCurDb = acdbHostApplicationServices()->workingDatabase();

CODE:

void FEGroups::iterateDictionary()
{
//obtain the GROUP dictionary by looking up "ACAD_GROUP" in the named object dictionary
//
/* AcDbDictionary *pNamedobj;
acdbHostApplicationServices()->workingDatabase()
->getNamedObjectsDictionary(pNamedobj, AcDb::kForRead);

// Get a pointer to the ASDK_DICT dictionary.
//
AcDbDictionary *pDict;
pNamedobj->getAt("ACAD_GROUP", (AcDbObject*&)pDict,
AcDb::kForRead);
pNamedobj->close();
*/
// Get a pointer to the ACAD_GROUP dictionary
AcDbDictionary *pDict;
acdbHostApplicationServices()->workingDatabase()
->getGroupDictionary(pDict, AcDb::kForRead);

// Get an iterator for the ASDK_DICT dictionary.
//
AcDbDictionaryIterator* pDictIter = pDict->newIterator();
AcDbGroup *pGroup;
char* name;
for (; !pDictIter->done(); pDictIter->next()) {
    // Get the current record, open it for read, and
    // print its name.
    //
    pDictIter->getObject((AcDbObject*&)pGroup,
      AcDb::kForRead);
pGroup->getName(name);
    pGroup->close();
    acutPrintf("\nintval is: %s", name);
}
delete pDictIter;
pDict->close();

}

//检测AutoCAD是否已经运行

CODE:

void Autocadtest()
{
   // TODO: Add your control notification handler code here
   IAcadApplication m_autocad;
   IAcadDocuments m_acaddocs;
   IAcadDocument m_acaddoc;
   IAcadModelSpace m_acadmodel;

   LPDISPATCH pDisp;
   LPUNKNOWN pUnk;
   CLSID clsid;
   BeginWaitCursor();
   ::CLSIDFromProgID(L"AutoCAD.Application",&clsid);
   if(::GetActiveObject(clsid,NULL,&pUnk)==S_OK)
   {
       VERIFY(pUnk->QueryInterface(IID_IDispatch,(void**) &pDisp)==S_OK);
       m_autocad.AttachDispatch(pDisp);
       pUnk->Release();
   }
   else
   {
       if(!m_autocad.CreateDispatch("AutoCAD.Application"))
       {
           AfxMessageBox("Autocad program not found\n");
           exit(1);
       }
   }
   m_autocad.SetVisible(true);
   m_acaddocs.AttachDispatch(m_autocad.GetDocuments(),true);
   m_acaddoc.AttachDispatch(m_acaddocs.Add(vtMissing),true);
   m_acadmodel.AttachDispatch(m_acaddoc.GetModelSpace(),true);
   m_acadmodel.AddCircle(pVal,100);

   m_acadmodel.ReleaseDispatch();
   m_acaddoc.ReleaseDispatch();
   m_acaddocs.ReleaseDispatch();
   m_autocad.ReleaseDispatch();
}

//计算多边形的形心坐标
BOOL GetPolyCentroid(AcDbPolyline * pPline, ads_point CenPt)
{
unsigned int i, iCount = 0;
AcDbVoidPtrArray curveSegments, regions;
AcGePoint3d LinePt0, LinePt1;
AcGePoint3d origin;
AcGeVector3d xAxis, yAxis;
double perimeter, area, prodInertia;
double momInertia[2], prinMoments[2], radiiGyration[2];
AcGePoint2d centroid;
AcGeVector2d prinAxes[2];
AcGePoint2d extentsLow, extentsHigh;

if (pPline->isClosed() != Adesk::kTrue) {
ads_printf("\n折线不封闭,无法形成正确的区域。");
return FALSE;
}
curveSegments.append((AcDbCurve *) pPline);

if (AcDbRegion::createFromCurves(curveSegments, regions) != Acad::eOk){
ads_printf("\n创建临时区域对象失败!");
//清除Region,应第9 贴的指点，即使createFromCurves错误，也应清除之；
iCount = regions.length();
for(i = 0; i < iCount; i++)
delete (AcDbRegion *)regions.at(i);

return FALSE;
}
AcDbRegion * pRegion;
if ((iCount = regions.length()) == 0){
ads_printf("\n创建临时区域对象为空!");
return FALSE;
}
if (iCount > 1){
// 多个 AcDbRegion ,无法确定应该返回哪一个，干脆返回NULL;
ads_printf("\n多个区域实体。");
for(i = 0; i < iCount; i++)
delete (AcDbRegion *)regions.at(i);
return FALSE;
}
pRegion = (AcDbRegion *) regions.at(0);

origin.set(0,0,0); //设置原点坐标
xAxis.set(1,0,0); //设置X Y轴，
yAxis.set(0,1,0);

if (pRegion->getAreaProp(
origin, xAxis, yAxis,
perimeter, area, centroid, momInertia, prodInertia, prinMoments, prinAxes, radiiGyration,
extentsLow, extentsHigh) != Acad::eOk ){
ads_printf("\n区域面积: %.3f,周长:%.3f", area, perimeter);
ads_printf("\n获取区域对象属性失败!");
delete pRegion;
return FALSE;
}
XYZ_POINT(CenPt, centroid.x, centroid.y, 0); //得到形心坐标
ads_printf("\n区域面积: %.3f,周长:%.3f", area, perimeter);
pRegion->close();
delete pRegion;

return TRUE;
}

AcDbObjectId CreateHatch(
                AcDbObjectId dbOId,
                char cLayer[],
                char cPattern[] = "SOLID",
                int nColor = 256,
                double dAngle = 0.0,
                double dScale = 1.0,
                AcDbDatabase * pDbDatab = acdbHostApplicationServices()->workingDatabase())
{
AcCmColor CmC;
AcDbObjectId DbOId;
AcDbObjectIdArray DbOIdA(0, 2);
AcDbBlockTable * pDbBT;
AcDbBlockTableRecord * pDbBTR;
AcGeVector3d normal(0.0, 0.0, 1.0);

DbOIdA.append(dbOId);

AcDbHatch* pDbHat = new AcDbHatch();

pDbHat->setDatabaseDefaults();

pDbHat->setAssociative(Adesk::kTrue); // BUG: doesn't do squat! have to set the reactor yourself to get associativity!

pDbHat->appendLoop(AcDbHatch::kExternal, DbOIdA);

pDbHat->setPatternScale(dScale);

pDbHat->setPatternAngle(dAngle);

pDbHat->setPattern(AcDbHatch::kPreDefined, cPattern);

pDbHat->setNormal(normal);

pDbHat->evaluateHatch(); // crucial call or nothing gets displayed!

pDbDatab->getSymbolTable(pDbBT, AcDb::kForRead);

pDbBT->getAt(ACDB_MODEL_SPACE, pDbBTR, AcDb::kForWrite);

pDbBTR->appendAcDbEntity(DbOId, pDbHat);

pDbHat->setLayer(cLayer);

CmC.setColorIndex(nColor);

((AcDbEntity *)pDbHat)->setColor(CmC);

pDbBT->close();

pDbBTR->close();

pDbHat->close();

return DbOId;

}

objectARX 常用功能实现集合

一在ARX中禁用AutoCAD的某个命令
以LINE命令为例，在程序中加入下面的一句即可禁用LINE命令：

acedCommand(RTSTR, "undefine", RTSTR, "line",RTNONE);

下面的语句则可恢复LINE命令的定义：

acedCommand(RTSTR, "redefine", RTSTR, "line",RTNONE);

二在对话框中预览DWG文件
使用acdbDisplayPreviewFromDwg函数，具体的方法为：
char fileName[100];
strcpy(fileName, "C:\\test.dwg");
bool es;
HWND pWnd;
CFrameWnd *pFrame = (CFrameWnd*)GetDlgItem(IDC_PICTURE);

es = acdbDisplayPreviewFromDwg(fileName, pFrame->m_hWnd);
上面的代码将在一个Picture控件中显示指定的图形。
另外，需要包含“dbmain.h”头文件。

三通过ARX更改AutoCAD窗口的标题名称
CMDIFrameWnd *pp;
pp=acedGetAcadFrame();
pp->SetWindowText ("yourName");
pp->UpdateWindow ();

四获得当前数据库
在ARX编程中，经常需要使用当前数据库，例如需要获得当前图形中设置的文字样式、标注样式等。
要获得当前数据库，都可以直接使用下面的方法：
AcDbTextStyleTable *pTextStyleTAble;
AcDbObjectId textstyleId;
textstyleId=acdbHostApplicationServices()->workingDatabase()->textstyle();
如果用acadCurDwg来代替acdbHostApplicationServices()->workingDatabase()，也能得到同样的结果。

五将一个图插入另一个图(两种方法)
在实践中常常要将外部的图形文件source.dwg中插入到另外一个图形中或者当前图形中.以插入到当前图形dest.dwg为例.
为了将一个source.dwg插入dest.dwg中,首先要找到source.dwg这个文件.我们可以使用各种基本的技术和相应的规则从你的机器上或PDM数据库中检索到你要插入的source.dwg,返回来一个字符窜sFileName代表整个文件及其路径.
然后创建一个空的数据库pNewDb读入source.dwg.
AcDbDatabase *pNewDb =new AcDbDatabase(Adesk::kFalse);
//在这里一定要用Adesk::kFalse
acDocManager->lockDocument(acDocManager->curDocument()) ;//如果确定你不需要LockDocument,这一行可以不要

es=pNewDb->readDwgFile(sFileName , _SH_DENYNO,false);
if (es!=Acad::eOk)
{
acutPrintf("\nThe file %s cannot be opend",sFileName);
return;
}

这样,source.dwg以经用pNewDb来表示了.我们用pDb来表示当前数据库
AcDbDatabase *pDb;
pDb =acdbHostApplicationServices ()->workingDatabase () ;

现在,我们用Insert来插入数据库. Insert有两种用法,一种是直接insert, source.dwg中的图元实体被分散地插入pDb中
pDb->insert( AcGeMatrix3d::kIdentity, pNewDb );//这里假定不对source.dwg做比例和转角的变换.如果我们在这里结束程序,我们能看到source.dwg已经被插入,但不是一个图块.

另外一种插入法是要求插入后source.dwg成为一个图块,图块的attribute也要从source.dwg中得到.这种方法要做大量的工作.首先运行insert()

CString pBlockName=”TestBlock”;
AcDbObjectId blockId;
if((es=pDb->insert(blockId, pBlockName,pNewDb, true))==Acad::eOk)
{
acutPrintf("\ninsert ok\n");
}
else
{
AfxMessageBox("Insert failed");
delete pNewDb;
return;
}

//这里blcokId是insert运行后产生的,它代表的是一个块表记录AcDbBlockRecord的ID. pBlockName是记录名,要在insert运行前设定其值.
如果我们在这里结束程序,我们看不到任何东西,因为source并没有真正被插入.我们还要做一些事,首先是创建一个 AcDbBlockReference, 并将它指向blockId所代表的AcDbBlockRecord,然后将这个AcDbBlockReference加入pDb所代表的图形数据库中.
AcDbBlockReference *pBlkRef = new AcDbBlockReference;
pBlkRef->setBlockTableRecord(blockId);//指向blockId;
pBlkRef->setPosition(Pt);//设定位置
pBlkRef->setRotation(Angle);//设定转角
pBlkRef->setScaleFactors( XrefScale);//设定放大比例

AcDbBlockTable *pBlockTable;
pDb->getSymbolTable(pBlockTable, AcDb::kForRead);

AcDbBlockTableRecord *pBlockTableRecord;
pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
pBlockTable->close();
AcDbObjectId newEntId;
pBlockTableRecord->appendAcDbEntity(newEntId, pBlkRef);
pBlockTableRecord->close();

如果我们在这里结束程序,我们将看到当前图形中source.dwg已经被作为图块插入.但是图块中没有source.dwg所定义的Attibute.因此我们还要做工作.后面的事情就简单了.

AcDbBlockTableRecord *pBlockDef;
acdbOpenObject(pBlockDef, blockId, AcDb::kForRead);

AcDbBlockTableRecordIterator *pIterator;
pBlockDef->newIterator(pIterator);
AcGePoint3d basePoint;
AcDbEntity *pEnt;
AcDbAttributeDefinition *pAttdef;
for (pIterator->start(); !pIterator->done();
pIterator->step())//将source.dwg中所有的Attibute进行遍历
{
pIterator->getEntity(pEnt, AcDb::kForRead);
pAttdef = AcDbAttributeDefinition::cast(pEnt);
if (pAttdef != NULL && !pAttdef->isConstant()) {
AcDbAttribute *pAtt = new AcDbAttribute();
pAtt->setPropertiesFrom(pAttdef);
pAtt->setInvisible(pAttdef->isInvisible());
basePoint = pAttdef->position();
basePoint += pBlkRef->position().asVector();
pAtt->setPosition(basePoint);
pAtt->setHeight(pAttdef->height());
pAtt->setRotation(pAttdef->rotation());
pAtt->setTag("Tag");
pAtt->setFieldLength(25);
char *pStr = pAttdef->tag();
pAtt->setTag(pStr);
acutDelString(pStr);
pAtt->setFieldLength(pAttdef->fieldLength());
pAtt->setTextString("-");

AcDbObjectId attId;

pBlkRef->appendAttribute(attId, pAtt);
pAtt->close();
}
pEnt->close(); // use pEnt... pAttdef might be NULL
}
delete pIterator;

六在ARX打开文件
在AutoCAD中打开图形，并且显示在图形窗口中，可以使用acedSyncFileOpen()函数。需要注意的是，这个函数只能在单文档模式中工作，

用户可以在AutoCAD“选项”对话框的“系统”选项卡中进行设置，或者在主函数中添加下面的语句：
acrxDynamicLinker->registerAppNotMDIAware(pkt);
具体的函数如下：

//加载模板文件
void LoadTemplate()
{
char fname[50];
strcpy(fname,"E:\\TMCAD\\TMCADtukuang\\A3.DWG");

#ifndef _ACAD2000
Acad::ErrorStatuses;
es = acedSyncFileOpen(fname);
#else
acDocManager->appContextOpenDocument(fname);
#endif
}

如果在多文档模式下，下面的方法可以在执行时弹出“选择文件”对话框，用户选择所要打开的文件后，在图形窗口中显示该图形。
void ZffOPENOpenDwg()
{
// 使用“选择文件”对话框选择所要打开的文件
acDocManager->openDocument();
}

下面的方法则打开指定位置的DWG文件。
void OpenDoc( void *pData)
{
AcApDocument* pDoc = acDocManager->curDocument();
if (acDocManager->isApplicationContext())
{
acDocManager->appContextOpenDocument((const char *)pData);
}
else
{
acutPrintf("\nERROR To Open Doc!\n");
}
}

// This is command 'OPEN1'
void ZffOPENopen1()
{
// 直接打开系统中存在的某个图形文件G:\AutoCAD图形\wen2.dwg
static char pData[] = "G:\\AutoCAD图形\\wen2.dwg";
acDocManager->executeInApplicationContext(OpenDoc, (void *)pData);
}
void ProgressBarTest()
{
acutPrintf("启动进度条..........\n");
acedSetStatusBarProgressMeter("测试进度条", 0, 100);
for (int value=0; value<=100; value++) {
Sleep(100); // 暂停，释放控制权
acedSetStatusBarProgressMeterPos(value);
}
acedRestoreStatusBar();

return;
}

如何获得程序路径
struct resbuf rb;

char sTemp[1024],*str;

ads_getvar("acadprefix",&rb);

strcpy(sTemp,rb.resval.string);

acad_free(rb.resval.rstring);

str=strchr(sTemp,';');

*str='\0';

str=strrchr(sTemp,'\\');

*str='\0';

上段程序中,sTemp中存储了安装CAD的目录
AUTOCAD的系统变量存储了一些与安装有关的信息,虽然不多,在正常情况是够用的.与目录有关的主要有:

dwgprefix 当前dwg图形存储的目录

acadprefix acad环境变量存储的目录

dwgname 当前dwg文件名

savefile 当前自动存储文件名

///从RGB得到cad颜色索引值
int getNearestACI(COLORREF color)
{
long acirgb, r,g,b;
long mindst = 2147483647L;
long dst = 0;
int minndx = 0;
long red=GetRValue(color);
long green=GetGValue(color);
long blue=GetBValue(color);
for ( int i = 1; i < 255; i++ ) {
   acirgb = acdbGetRGB ( i );
   r =GetRValue(acirgb);
   g =GetGValue(acirgb);
   b =GetBValue(acirgb);

   dst = abs ( r-red) + abs ( g -green) + abs (b-blue);
   if ( dst < mindst ) {
    minndx = i;
    mindst = dst;
   }
}
return minndx;

}

//功  能：从CAD的颜色得到RGB
COLORREF CGlobal::GetColorFromIndex(int colorIndex)
{
if(colorIndex < 0 || colorIndex > 255)
{
   ads_alert("传入的颜色号不在0~255之间!");
   return 0;
}

BYTE R, G, B;
#ifdef ARX_2002_dll
R = lpszRGBData[colorIndex*3+0];
G = lpszRGBData[colorIndex*3+1];
B = lpszRGBData[colorIndex*3+2];
#else
long zhi = acdbGetRGB(colorIndex);
WORD LOW = LOWORD(zhi);
WORD HIG = HIWORD(zhi);
R = LOBYTE(LOW);
G = HIBYTE(LOW);
B = LOBYTE(HIG);
#endif

return RGB(R,G,B);

//return acdbGetRGB(nColor);
}

获取AcDbDimension里的属性信息
AcDbEntity *pEnt;
AcDbObjectId id;
AcGePoint3d ptPick;
ads_name eName;
if (acedEntSel ("Select a dimension: " , eName, asDblArray (ptPick)) != RTNORM )
return;
acdbGetObjectId (id, eName);
acdbOpenAcDbEntity (pEnt, id, AcDb::kForRead);
//----- Get the id of the block table record which owns the text entity
AcDbDimension *pDim =AcDbDimension::cast (pEnt);
if (pDim == NULL)
{
pEnt->close ();
return;
}

id =pDim->dimBlockId ();
pDim->close ();
AcDbBlockTableRecord *pr;
acdbOpenAcDbObject ((AcDbObject *&) pr, id, AcDb::kForRead);
//----- Iterating the block table record
AcDbBlockTableRecordIterator *pi;
pr->newIterator (pi);
while (!pi->done ())
{
pi->getEntity (pEnt, AcDb::kForRead);
if (pEnt->isKindOf (AcDbMText::desc ()))
{
AcDbMText *pt = (AcDbMText *) pEnt;
char *s = pt->contents ();
acutPrintf (s);
delete s;
}
pEnt->close();
pi->step();
}
pr->close();

插入定义的属性块

2007-08-16 09:19

CString blockname; ///获得要插入的块名
CMyDraw my_draw;
my_draw.PoleBlockName(blockname,m_stat,m_type);
blockname=APPPATH+"blocks\\DG\\"+blockname+".DWG";
///////////////////////////////////////////////////////////////

//寻找是否已经定义
AcDbDatabase *pCurDb = acdbHostApplicationServices()->workingDatabase();
AcDbBlockTable *pBlkTable;
AcDbObjectId blockId ;
pCurDb->getBlockTable(pBlkTable, AcDb::kForRead);

if(!pBlkTable->has(blockname))    //杳找块是否存在
{
   pBlkTable->close();
   AcDbDatabase *pDwg =new AcDbDatabase (Adesk::kFalse) ;

pDwg->readDwgFile (blockname) ; //读入块定义

Acad::ErrorStatus es = pCurDb->insert (blockId, "blockname", pDwg);//, Adesk::kFalse) ; //

   delete pDwg ;
   if ( es != Acad::eOk )
   {
    acutPrintf ("\n插入块错误.") ;
    return;
   }
}
else
   pBlkTable->getAt(blockname, blockId);

BeginEditorCommand();
AcGePoint3d pt;
int rc=acedGetPoint(NULL,"\n选择插入点:",asDblArray(pt));
if (rc==RTCAN||rc==RTNONE)
{
   acutPrintf("\n*取消了插入操作*");
   CancelEditorCommand();
   return;
}
//CompleteEditorCommand();
CancelEditorCommand();

double m_angle=0;
double m_scale=1;
//---- 设置插入点，旋转角度，比例等等
AcDbBlockReference *pBlkRef =new AcDbBlockReference(AcGePoint3d(pt[0],pt[1],pt[2]),blockId) ;
//pBlkRef->setBlockTableRecord (blockId) ;
pBlkRef->setScaleFactors(AcGeScale3d(m_scale,m_scale,1));
//pBlkRef->setPosition(AcGePoint3d(pt[0],pt[1],pt[2])) ;
pBlkRef->setRotation (m_angle) ;

////////////////////////////////////////////////////////////////////
pBlkRef->setLayer(NULL); //设置图层

////////////////////////////////////////////////////////获得模型空间块表记录
AcDbBlockTable *pBlockTable ;
acdbHostApplicationServices()->workingDatabase()->getBlockTable (pBlockTable, AcDb::kForRead) ;
AcDbBlockTableRecord *pBlockTableRecord=new AcDbBlockTableRecord;
pBlockTable->getAt (ACDB_MODEL_SPACE, pBlockTableRecord,AcDb::kForWrite) ;
pBlockTable->close () ;
pBlockTableRecord->appendAcDbEntity(pBlkRef);

//AcDbBlockTableRecord *pBlockDef;
//acdbOpenObject(pBlockDef, blockId, AcDb::kForRead);
//AcDbBlockTableRecordIterator *pInterator;
//pBlockDef->newIterator(pInterator);
//AcDbEntity *pEnt;
//AcDbAttributeDefinition *pAttdef;
//for(pInterator->start(); !pInterator->done(); pInterator->step())
//{
// pInterator->getEntity(pEnt, AcDb::kForRead);
// pAttdef = AcDbAttributeDefinition::cast(pEnt);
// if (pAttdef!=NULL && !pAttdef->isConstant())
// {
//   AcDbAttribute *pAtt = new AcDbAttribute();
//   pAtt->setPropertiesFrom(pAttdef);
//   pAtt->setInvisible(pAttdef->isInvisible());
//   pt = pAttdef->position();
//   pt +=pBlkRef->position().asVector();
//   pAtt->setPosition(pt);
//   pAtt->setHeight(pAttdef->height());
//   pAtt->setRotation(pAttdef->rotation());
//   pAtt->setTag("Tag");
//   pAtt->setFieldLength(25);
//   char *pStr = pAttdef->tag();
//   pAtt->setTag(pStr);
//   free(pStr);
//   pAtt->setTextString("Assigned Attribute Value");
//   AcDbObjectId attId;
//   pBlkRef->appendAttribute(attId, pAtt);
//   pAtt->close();
// }
// pEnt->close();
//}
//delete pInterator;
//pBlockDef->close();
//pBlkRef->close();

// 获得属性
AcDbBlockTableRecord *pBlkDefRecord;
acdbOpenObject(pBlkDefRecord, blockId, AcDb::kForRead);

CStringArray ArrayAtt;
int i=0;
ArrayAtt.Add(m_bz);
ArrayAtt.Add(m_edit_num_val); //////////////属性值
ArrayAtt.Add(m_stat);
ArrayAtt.Add(m_spec);
ArrayAtt.Add(m_type);

if(pBlkDefRecord->hasAttributeDefinitions())
{
//AcDbObjectIterator* pBlkIterator = pBlkRef->attributeIterator(); //修改

AcDbBlockTableRecordIterator *pIterator;
pBlkDefRecord->newIterator(pIterator);

   for(pIterator->start(); !pIterator->done();pIterator->step()) //遍历块的属性
   {
    AcDbEntity *pEnt;
    pIterator->getEntity(pEnt, AcDb::kForRead);
    AcDbAttributeDefinition *pAttDef = AcDbAttributeDefinition::cast(pEnt);

    if(pAttDef != NULL && !pAttDef->isConstant())
    {
     AcDbAttribute* pAtt = new AcDbAttribute();
     pAtt->setPropertiesFrom(pAttDef);
     pAtt->setInvisible( pAttDef->isInvisible() );

     pAtt->setHorizontalMode(pAttDef->horizontalMode());
     pAtt->setVerticalMode(pAttDef->verticalMode());
     AcGePoint3d basePt = pAttDef->position();
     basePt[0]+=pt[0];
     basePt[1]+=pt[1];
     basePt[2]+=pt[2];
     pAtt->setPosition(basePt);

     basePt = pAttDef->alignmentPoint();
     basePt[0]+=pt[0];
     basePt[1]+=pt[1];
     basePt[2]+=pt[2];
     pAtt->setAlignmentPoint(basePt);

pAtt->setHeight(pAttDef->height());
pAtt->setTextStyle(pAttDef->textStyle());

     pAtt->setTag(pAttDef->tag());
     pAtt->setTextString(ArrayAtt.GetAt(i++));
     pAtt->setFieldLength(25);

     AcDbObjectId attId;
     pBlkRef->appendAttribute(attId,pAtt);
     pAtt->close();
     pEnt->close();
    }
   }
   delete pIterator;
}//end if pBlkDefRecord->hasAttributeDefinitions

pBlkDefRecord->close();

pBlockTableRecord->close();
pBlkRef->close();

objectARX常用代码2收藏

新一篇: Windows下动态内存分配方式 | 旧一篇: CString操作指南

设置当前的layer和textstyle

//  Function name    : SetCurTextStyle
//  Description        : 设置当前TextStyle
//  Return type        : Acad::ErrorStatus
//  Argument         : const char* lpStyleName
//  Argument         : AcDbDatabase* pDb/* = NULL */
Acad::ErrorStatus SetCurTextStyle( const   char *  lpStyleName, AcDbDatabase *  pDb /*  = NULL  */ )
{
    AcDbDatabase *  pCurDb  =  pDb;
     if  (pCurDb  ==  NULL)
        pCurDb  =  acdbHostApplicationServices() -> workingDatabase();

    AcDbTextStyleTableRecordPointer spRecord(lpStyleName, pCurDb, AcDb::kForRead);
    Acad::ErrorStatus es  =  spRecord.openStatus();
     if  (es  ==  Acad::eOk)
     {
        es  =   pCurDb -> setTextstyle(spRecord -> objectId());
    }
     return  es;
}

//  Function name    : SetCurLayer
//  Description        : 设置当前层
//  Return type        : Acad::ErrorStatus
//  Argument         : const char* lpLayerName
//  Argument         : AcDbDatabase* pDb/* = NULL */
Acad::ErrorStatus SetCurLayer( const   char *  lpLayerName, AcDbDatabase *  pDb /*  = NULL  */ )
{
    AcDbDatabase *  pCurDb  =  pDb;
     if  (pCurDb  ==  NULL)
        pCurDb  =  acdbHostApplicationServices() -> workingDatabase();

    AcDbLayerTableRecordPointer spRecord(lpLayerName, pCurDb, AcDb::kForRead);
    Acad::ErrorStatus es  =  spRecord.openStatus();
     if  (es  ==  Acad::eOk)
     {
        es  =   pCurDb -> setClayer(spRecord -> objectId());
    }
     return  es;
}

//功能描述:选择指定图层上的所有实体！

// ************************************************************************
// 函数名称:selectEntityInLayer
// 函数类型:Acad::ErrorStatus
// 返回值:  正常：Acad::eOk
// 功能描述:选择指定图层上的所有实体！
// 函数作者:Darcy
// 创建日期:200X-XX-XX
// 参数列表:
// 变量名:nLayerName     变量类型:const char*           变量说明:(输入)图层名
// 变量名:nIDs           变量类型:AcDbObjectIdArray&    变量说明:(输出)图层中实体的对象标识符集合
// ************************************************************************
Acad::ErrorStatus selectEntityInLayer( const   char *  nLayerName,AcDbObjectIdArray &  nIDs)
{
    Acad::ErrorStatus es  =  Acad::eOk;

    ads_name ents;
     struct  resbuf  * rb;
    rb = acutNewRb(AcDb::kDxfLayerName);
    rb -> restype = 8 ;
    rb -> resval.rstring = ( char * )nLayerName;
    rb -> rbnext = NULL;
    acedSSGet( " X " ,NULL,NULL,rb,ents);
     long  entNums = 0 ;
    acedSSLength(ents, & entNums);
     if  (entNums  ==   0 )
        es  =  Acad::eInvalidInput;
     else
      {
         for  ( long  a  =   0 ; a  <  entNums ; a  ++ )
         {
            AcDbObjectId  objId;
            ads_name      ent;
            acedSSName(ents,a,ent);
            acdbGetObjectId(objId, ent);
            nIDs.append(objId);
        }
    }
    acedSSFree(ents);
    acutRelRb(rb);

     return  es;
}

另一种实现

//************************************************************************
//函数名称:selectEntityInLayer
//函数类型:Acad::ErrorStatus
//返回值:
//功能描述:选择指定层上的实体，得到其对象属性标识符！
//函数作者:Darcy
//创建日期:200X-XX-XX
//参数列表:
//变量名:nLayerName      变量类型:CString               变量说明:
//变量名:nIDs            变量类型:AcDbObjectIdArray&    变量说明:
//变量名:nModelSpace     变量类型:bool                  变量说明:
//************************************************************************
Acad::ErrorStatus    selectEntityInLayer(
                                         CString nLayerName,
                                         AcDbObjectIdArray& nIDs,
                                         bool nModelSpace
                                         )
{
    Acad::ErrorStatus es=Acad::eOk;

    AcDbBlockTable*        pBlockTable=NULL;
    AcDbBlockTableRecord*  pSpaceRecord=NULL;
    if (acdbHostApplicationServices()->workingDatabase()==NULL)
        return Acad::eNoDatabase;
    if ((es = acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlockTable, AcDb::kForRead))==Acad::eOk)
    {
        char entryName[13];
        if (nModelSpace)
            strcpy(entryName,ACDB_MODEL_SPACE);
        else
            strcpy(entryName,ACDB_PAPER_SPACE);
        //Get the Model or Paper Space record and open it for read:
        if ((es = pBlockTable->getAt((const char*)entryName, pSpaceRecord, AcDb::kForRead))==Acad::eOk)
        {
                AcDbBlockTableRecordIterator* pIter;
                if (pSpaceRecord->newIterator(pIter)==Acad::eOk)
                {
                    for (pIter->start();!pIter->done();pIter->step())
                    {
                        char *name=NULL;
                        AcDbEntity* pEntity;
                        if (pIter->getEntity(pEntity,AcDb::kForRead)==Acad::eOk)
                        {
                            name=pEntity->layer();
                            if (nLayerName.CompareNoCase(name)==0)
                                nIDs.append(pEntity->objectId());

                            pEntity->close();
                            acutDelString(name);
                        }
                    }
                    delete pIter;
                }
                pSpaceRecord->close();
        }
        pBlockTable->close();
    }

    return es;
}

生成新组

//生成新组（sGroupName）
//追加数组中所有实体到该组中
//组名字 ,   Id数组
int createGroup(CString sGroupName,
                                   const AcDbObjectIdArray *idArr)
{
    AcDbGroup       *pGroup = new AcDbGroup((LPSTR)(LPCTSTR)sGroupName);
    AcDbObjectId     groupObjectId;
    AcDbDictionary  *pGroupDict = NULL;

    acdbHostApplicationServices()->workingDatabase()
        ->getGroupDictionary(pGroupDict, AcDb::kForWrite);
    pGroupDict->setAt(sGroupName, pGroup, groupObjectId);
    pGroupDict->close();
      pGroup->close();
    acdbOpenObject(pGroup, groupObjectId, AcDb::kForWrite);
    for (int i = 0; i < idArr->length(); i++)
    {
        groupObjectId = idArr->at(i);
        pGroup->append(groupObjectId);
    }
    pGroup->close();
    return TRUE;
}

另一个

Acad::ErrorStatus CDrawFunction::createGroup(CString groupname,AcDbObjectIdArray IdArray)
{
Acad::ErrorStatus es=Acad::eOk;
AcDbDictionary *pGroupDict=NULL;
AcDbGroup *pGroup=NULL;
if((es=acdbHostApplicationServices()->workingDatabase()->getGroupDictionary(pGroupDict,AcDb::kForWrite))!=Acad::eOk)
{
return es;
}
AcDbObjectId groupId;
es=pGroupDict->getAt(groupname,groupId);
if(es==Acad::eInvalidKey)
{
acutPrintf("\n输入的词典名无效!");
pGroupDict->close();
return es;
}
else if(es==Acad::eKeyNotFound)
{
pGroup=new AcDbGroup("GroupDiscription");
if((es=pGroupDict->setAt(groupname,pGroup,groupId))!=Acad::eOk)
{
pGroup->close();pGroupDict->close();return es;
}
}
else if(es==Acad::eOk )
{
if((es=acdbOpenObject(pGroup,groupId,AcDb::kForWrite))!=Acad::eOk)
{
pGroupDict->close();return es;
}
}
for(int i=0;i pGroup->append(IdArray[i]);
pGroup->setSelectable(FALSE);
pGroupDict->close();
pGroup->close();
return es;
}

旋转整个group

void CMyDatabase::rotationGroup(CString strGroupName ,CReiPoint ptRotation,double rotationAngle)
{
    AcGePoint3d pt;
    AcDbDictionary *pGroupDict;
    acdbCurDwg()->getGroupDictionary(pGroupDict,AcDb::kForWrite);
    AcDbObjectId groupId;
    AcDbGroup *pGroup;
    pt.x=ptRotation.x;
    pt.y=ptRotation.y;
    pt.z=ptRotation.z;
    if(pGroupDict->getAt(strGroupName,groupId)==Acad::eOk)
       acdbOpenObject(pGroup,groupId,AcDb::kForWrite);
    else
    {
        pGroupDict->close();
        return;
    }
    pGroupDict->close();
    AcDbGroupIterator* pIter=pGroup->newIterator();
    AcDbEntity* pEnt;
    AcDbObjectId objId;
        pIter=pGroup->newIterator();
    for(;!pIter->done();pIter->next())
    {
        objId=pIter->objectId();
        acdbOpenAcDbEntity(pEnt,objId,AcDb::kForWrite);
        rotationEntity(pEnt,pt,rotationAngle);
        pEnt->close();
    }
    delete pIter;
    pGroup->close();
}

新建一个图层

//==========================================================
功能：新建一个图层
参数：LayerName -- 图层名，LayerColor -- 颜色名
返回：图层ID
//==========================================================
AcDbObjectId CreateNewLayer(CString LayerName, AcCmColor LayerColor)
{
    // 获得当前图形数据库的符号表
    AcDbLayerTable *pLayerTable;
    acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pLayerTable,
        AcDb::kForWrite);
    // 生成新的图层表记录
    AcDbLayerTableRecord *pLayerTableRecord = new AcDbLayerTableRecord;
    pLayerTableRecord->setName(LayerName);        // 设置图层名
    pLayerTableRecord->setColor(LayerColor);    // 设置图层颜色
    AcDbObjectId layerId;
    pLayerTable->add(layerId,pLayerTableRecord);
    // 关闭图层表和图层表记录
    pLayerTable->close();
    pLayerTableRecord->close();
    return layerId;
}

//==========================================================
功能：在指定图层上新建一条直线
参数：见注释
返回：直线ID
//==========================================================
AcDbObjectId CreateLine( double x1,double y1,double z1,  // 起点坐标
                     double x2,double y2,double z2,  // 终点坐标
                     AcDbObjectId layer)                   // 直线所在图层
{
    AcGePoint3d StartPt(x1,y1,z1);    // 起点
    AcGePoint3d EndPt(x2,y2,z2);    // 终点
    AcDbLine *pLine = new AcDbLine(StartPt,EndPt);
    // 获得当前图形数据库的符号表
    AcDbBlockTable *pBlockTable;
    acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlockTable,
        AcDb::kForRead);
    // 获得符号表中的模型空间块表记录指针，用于添加对象
    AcDbBlockTableRecord *pBlockTableRecord;
    pBlockTable->getAt(ACDB_MODEL_SPACE,pBlockTableRecord,AcDb::kForWrite);
    pBlockTable->close();
    // 将直线添加到模型空间块表记录中
    AcDbObjectId lineId;
    pLine->setLayer(layer,Adesk::kTrue);    // 设置直线所在图层
    pBlockTableRecord->appendAcDbEntity(lineId,pLine);
    // 关闭块表记录指针和直线指针
    pBlockTableRecord->close();
    pLine->close();
    // 返回直线ID号
    return lineId;
}

不太常用的啊

已知一段弧的起点和终点以及其凸度,求其圆心

int getCenter(ads_point startPoint,ads_point endPoint,double bulge,ads_point& center)
{
if (bulge==0.0)
{
ads_point_set(startPoint,center);
return 0;
}
ads_point startPt,endPt;
if (bulge<0.0)
{
ads_point_set(endPoint,startPt);
ads_point_set(startPoint,endPt);
bulge=bulge*(-1.0);
}
else
{
ads_point_set(startPoint,startPt);
ads_point_set(endPoint,endPt);
}
double distStartToEnd,distX,distY,radius;
distStartToEnd=ads_distance(startPt,endPt);
distX=distStartToEnd/2.0;
distY=bulge*distX;
radius=((distX*distX)+(distY*distY))/(2.0*distY);

double tmpAng;
ads_point tmpPt;

tmpAng=ads_angle(startPt,endPt);
ads_polar(startPt,tmpAng,distX,tmpPt);
ads_polar(tmpPt,(tmpAng+(_PI/2.0)),(radius-distY),center);
return 1;

};

create hatch的

AcDbObjectId CreateHatch(
AcDbObjectId dbOId,
char cLayer[],
char cPattern[] = "SOLID",
int nColor = 256,
double dAngle = 0.0,
double dScale = 1.0,
AcDbDatabase * pDbDatab = acdbHostApplicationServices()->workingDatabase())
{
AcCmColor CmC;
AcDbObjectId DbOId;
AcDbObjectIdArray DbOIdA(0, 2);
AcDbBlockTable * pDbBT;
AcDbBlockTableRecord * pDbBTR;
AcGeVector3d normal(0.0, 0.0, 1.0);

DbOIdA.append(dbOId);

AcDbHatch* pDbHat = new AcDbHatch();

pDbHat->setDatabaseDefaults();

pDbHat->setAssociative(Adesk::kTrue); // BUG: doesn't do squat! have to set the reactor yourself to get associativity!

pDbHat->appendLoop(AcDbHatch::kExternal, DbOIdA);

pDbHat->setPatternScale(dScale);

pDbHat->setPatternAngle(dAngle);

pDbHat->setPattern(AcDbHatch::kPreDefined, cPattern);

pDbHat->setNormal(normal);

pDbHat->evaluateHatch(); // crucial call or nothing gets displayed!

pDbDatab->getSymbolTable(pDbBT, AcDb::kForRead);

pDbBT->getAt(ACDB_MODEL_SPACE, pDbBTR, AcDb::kForWrite);

pDbBTR->appendAcDbEntity(DbOId, pDbHat);

pDbHat->setLayer(cLayer);

CmC.setColorIndex(nColor);

((AcDbEntity *)pDbHat)->setColor(CmC);

pDbBT->close();

pDbBTR->close();

pDbHat->close();

return DbOId;

}

前阵困扰我的问题解决了，现在共享给大家：
//************************************************************************
//函数名称:getPointAtDistInGeCurve
//函数类型:Acad::ErrorStatus
//返回值:
//功能描述:返回曲线上距起点某距离值处的点。
//函数作者:Darcy
//创建日期:2003-XX-XX
//参数列表:
//变量名:pGeCurve 变量类型:const AcGeCurve3d * 变量说明:
//变量名:dist 变量类型:double 变量说明:
//变量名:point 变量类型:AcGePoint3d& 变量说明:
//备注:
//************************************************************************
Acad::ErrorStatus getPointAtDistInGeCurve(const AcGeCurve3d * pGeCurve,double dist,AcGePoint3d& point)
{
Acad::ErrorStatus es = Acad::eOk;

if ( pGeCurve != NULL )
{
AcGePoint3d spt;
double pa=0.,datumParam=0.;
//距离从起点起算！
Adesk::Boolean posParamDir=Adesk::kTrue;

pGeCurve->hasStartPoint(spt);

datumParam = pGeCurve->paramOf(spt);;

pa = pGeCurve->paramAtLength(
datumParam,
dist,
posParamDir
);

point=pGeCurve->evalPoint(pa);
}
else
es = Acad::eInvalidInput;

return es;
}

判断点是否在圆弧上

/*****************************************************/
BOOL
IsAtArc(CAD_POINT firstPt,CAD_POINT secondPt,
double radius,double direct,int More,CAD_POINT thePt)
/* 判断某点是否在圆弧上
firstPt 圆弧起点
secondPt 圆弧终点
radius 半径
direct 偏向( >=0__左偏 <0__右偏 )
More (More<0__小圆弧,More>0__大圆弧)
thePt 判断点
返回：TRUE__在圆弧上 FALSE__不在圆弧上
*/
{
CAD_POINT centerPt,sectionPt;
CAD_POINT startPt,endPt;
double startAngle,endAngle,chordAngle,vertAngle;
double intLine,chordLine;
/* centerPt 圆弧圆心
sectionPt 弦线中心点
startAngle 圆弧起点切线角度（弧度）
endAngle 圆弧终点切线角度（弧度）
chordAngle 弦线角度（弧度）
vertAngle 与弦线垂直的垂线角度（弧度）
intLine 弦线中心至圆心距离
chordLine 弦线长度
*/
sectionPt.x = (firstPt.x + secondPt.x)/2;
sectionPt.y = (firstPt.y + secondPt.y)/2;

chordLine = sqrt( pow( (secondPt.x-firstPt.x),2 ) + pow( (secondPt.y-firstPt.y),2 ) );
intLine = sqrt((radius*radius-chordLine*chordLine/4) );

chordAngle = ads_angle(asDblArray(firstPt),asDblArray(secondPt)); //弦线的角度

if(direct>=0)//左偏
{
startPt=firstPt;
endPt=secondPt;
vertAngle=chordAngle+Pai/2;
}
else if(direct<0)//右偏
{
startPt=secondPt;
endPt=firstPt;
vertAngle=chordAngle-Pai/2;
}

if(More<=0)//小圆弧
{
centerPt.x=sectionPt.x+intLine*cos(vertAngle);
centerPt.y=sectionPt.y+intLine*sin(vertAngle);
}
else//大圆弧
{
centerPt.x=sectionPt.x-intLine*cos(vertAngle);
centerPt.y=sectionPt.y-intLine*sin(vertAngle);
}

if(fabs(centerPt.distanceTo(thePt)-radius)>1.0E-8)
return FALSE;
startAngle = ads_angle(asDblArray(centerPt),asDblArray(startPt));
endAngle = ads_angle(asDblArray(centerPt),asDblArray(endPt));

AcDbArc *pArc=new AcDbArc(centerPt,radius,startAngle,endAngle);
AcDbLine *pLine=new AcDbLine(centerPt,thePt);
AcGePoint3dArray Points;
pLine->intersectWith(pArc,AcDb::kOnBothOperands,Points);
if(Points.isEmpty()) return FALSE;

return TRUE;
}

相object加xdata

void affixXdata(char *appName, char *xData, AcDbObject *pObj)
{
    //向AcDbObject添加扩展数据Xdata
    struct resbuf *pRb, *pTemp;

    acdbRegApp(appName);
    pRb = acutNewRb(AcDb::kDxfRegAppName);
    pTemp = pRb;
    pTemp->resval.rstring = new char[strlen(appName)+1];
    strcpy(pTemp->resval.rstring, appName);

    pTemp->rbnext = acutNewRb(AcDb::kDxfXdAsciiString);
    pTemp = pTemp->rbnext;
    pTemp->resval.rstring = new char[strlen(xData)+1];
    strcpy(pTemp->resval.rstring, xData);

    pObj->setXData(pRb);
    acutRelRb(pRb);
}

//添加扩展数据
//实体添加扩展数据(字符串)
bool AddXData(CString appName, AcDbObjectId entId,CString data)
{
//open entity for read
AcDbEntity*pEnt;
Acad::ErrorStatus es=acdbOpenAcDbEntity(pEnt,entId,AcDb::kForRead);
if(es!=Acad::eOk)
{
ads_printf("error in open entity\n");
return false;
}
//get XData buffer
struct resbuf*pRb,*pTemp;
pRb=pEnt->xData(appName);
if(pRb!=NULL)//have XData
{
//pTemp移到表尾
pTemp=pRb;
for(pTemp=pRb;pTemp->rbnext!=NULL;pTemp=pTemp->rbnext){;}
}
else//NOT have XData
{
//create new xData
ads_regapp(appName);
pRb=ads_newrb(AcDb::kDxfRegAppName);
pRb->resval.rstring=(char*)malloc(appName.GetLength()+1);
strcpy(pRb->resval.rstring,appName);
pTemp=pRb;
}
//fill xData string
pTemp->rbnext=ads_newrb(AcDb::kDxfXdAsciiString);
pTemp=pTemp->rbnext;
pTemp->resval.rstring=(char*)malloc(data.GetLength()+1);
strcpy(pTemp->resval.rstring,data);
//add xData
es=pEnt->upgradeOpen();
if(es!=Acad::eOk)
{
ads_printf("\nError occur in updateOpen.");
pEnt->close();
ads_relrb(pRb);
return false;
}
es=pEnt->setXData(pRb);
if(es!=Acad::eOk)
{
ads_printf("\nError occur in setXData.");
pEnt->close();
ads_relrb(pRb);
return false;
}
//
pEnt->close();
ads_relrb(pRb);
return true;
}