ObjectARX_AutoCAD创建直线功能实现

void CreateLine()//创建直线命令
{ads_point startPoint, endPoint;//用户交互，获取点int nReturn;nReturn = acedGetPoint(NULL, _RXST("指定第一个点:"), startPoint);if (nReturn != RTNORM){AfxMessageBox(_RXST("点选失败."));return;}//记录坐标点的数目int PotNumber = 1;ads_point temp_point;temp_point[X] = startPoint[X], temp_point[Y] = startPoint[Y];while (true){acedInitGet(NULL, _T("U C"));if (PotNumber >= 3){nReturn = acedGetPoint(temp_point, _RXST("\n指定下一点或闭合(C)或放弃(U):"), endPoint);}else {nReturn = acedGetPoint(temp_point, _RXST("\n指定下一点或放弃(U):"), endPoint);}//判断时关键字or按下一点or其他if (nReturn == RTKWORD)//关键字{ACHAR kword[20];if (acedGetInput(kword) != RTNORM){return;}if (_tcscmp(kword, _T("U")) == 0){acutPrintf(_RXST("放弃 创建直线."));return;}else if (_tcscmp(kword, _T("C")) == 0){if (PotNumber < 3)continue;AcGePoint3d AcGeStartPot = asPnt3d(temp_point);AcGePoint3d AcGeEndPot = asPnt3d(startPoint);AcDbLine *pLine = new AcDbLine(AcGeStartPot, AcGeEndPot);HysuEditor::PostToModelSpace(pLine);acutPrintf(_RXST("闭合直线."));return;}elseAfxMessageBox(_RXST("关键字无效."));}else if (nReturn == RTNORM)//按下一点{PotNumber++;AcGePoint3d AcGeStartPot = asPnt3d(temp_point);AcGePoint3d AcGeEndPot = asPnt3d(endPoint);AcDbLine *pLine = new AcDbLine(AcGeStartPot, AcGeEndPot);HysuEditor::PostToModelSpace(pLine);//将下一点坐标转换成下一直线的起始点temp_point[X] = endPoint[X], temp_point[Y] = endPoint[Y];}else//其他{acutPrintf(_RXST("\n已退出 创建直线."));return;}	}
}

AcDbObjectId HysuEditor::PostToModelSpace(AcDbEntity *pEnt, AcDbDatabase *pDb)
{AcDbBlockTable *pBlkTbl = NULL;Acad::ErrorStatus es;es = pDb->getBlockTable(pBlkTbl, AcDb::kForRead);if (es != Acad::eOk){acutPrintf(_T("\n块表打开失败，错误代码：%s"), acadErrorStatusText(es));return AcDbObjectId::kNull;}AcDbBlockTableRecord *pBlkTblRcd = NULL;es = pBlkTbl->getAt(ACDB_MODEL_SPACE, pBlkTblRcd, AcDb::kForWrite);if (es != Acad::eOk){acutPrintf(_T("\n模型空间块表记录打开失败，错误代码：%s"), acadErrorStatusText(es));pBlkTbl->close();return AcDbObjectId::kNull;}pBlkTbl->close();AcDbObjectId outId;es = pBlkTblRcd->appendAcDbEntity(outId, pEnt);if (es != Acad::eOk){acutPrintf(_T("\n无法添加实体到模型空间，错误代码：%s"), acadErrorStatusText(es));pBlkTblRcd->close();return AcDbObjectId::kNull;}pEnt->close();pBlkTblRcd->close();return outId;
}