ObjectARX学习笔记(十一)----创建圆弧AcDbArc

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AcDbArc(    const AcGePoint3d& center,     double radius,     double startAngle,     double endAngle);

Parameters

Description

const AcGePoint3d& center

Input center point of the arc

double radius

Input radius of the arc

double startAngle

Input starting angle of the arc

double endAngle

Input ending angle of the arc

AcDbArc(    const AcGePoint3d& center,     const AcGeVector3d& normal,     double radius,     double startAngle,     double endAngle);

Parameters

Description

const AcGePoint3d& center

Input center point of the arc

const AcGeVector3d& normal

Input normal vector of the plane containing the arc

double radius

Input radius of the arc

double startAngle

Input starting angle of the arc

double endAngle

Input ending angle of the arc

#define PI 3.1415926535897932384626433832795L

//创建圆弧
AcGePoint3d ptSart(0,0,0);
//输入的角度是弧度

AcDbArc *pArc= new AcDbArc(ptSart,200,0 , 90* PI / 180.0);

if (pArc == NULL)
return;

//将实体添加到模型空间是固定的代码，
AcDbDatabase* pDb = NULL;
pDb = acdbHostApplicationServices()->workingDatabase();
if (pDb == NULL)
return ;

AcDbBlockTable * pBlkTable ;
if(pDb->getBlockTable(pBlkTable , AcDb::kForRead) != Acad::eOk )
return ;

AcDbBlockTableRecord * pRec ;
if(pBlkTable->getAt(ACDB_MODEL_SPACE , pRec , AcDb::kForWrite) != Acad::eOk)
return ;
pBlkTable->close();

AcDbObjectId objId = AcDbObjectId::kNull;

if(pRec->appendAcDbEntity(objId, pArc) != Acad::eOk) //将线添加到dwg中
return ;

pArc->close() ;
pRec->close() ;

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