创建AcDb2dPolyline实体
遍历AcDb2dPolyline实体的顶点坐标
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1 static void iterate(AcDbObjectId pLineId) 2 { 3 //打开AcDb2dPolyline对象 4 AcDb2dPolyline *pPline; 5 acdbOpenObject(pPline, pLineId, AcDb::kForRead); 6 7 //获得多段线的矢量遍历器 8 AcDbObjectIterator *pVertIter = pPline->vertexIterator(); 9 pPline->close(); 10 11 //对顶点进行遍历 12 AcDb2dVertex *pVertex; 13 AcGePoint3d location; 14 AcDbObjectId vertexobjectId; 15 for (int vertexNumber = 0; !pVertIter->done(); vertexNumber++, pVertIter->step()) 16 { 17 //打开矢量对象 18 vertexobjectId = pVertIter->objectId(); 19 acdbOpenObject(pVertex, vertexobjectId,AcDb::kForRead); 20 21 //获得矢量对象的坐标 22 location = pVertex->position(); 23 pVertex->close(); 24 25 //输出坐标 26 acutPrintf(L"\nVertox %d location is : %0.3f, %0.3f, %0.3f", vertexNumber, location[X], location[Y], location[Z]); 27 } 28 delete pVertIter; 29 }
创建AcDb2dPolyline实体
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1 static void lzxARX_AcDbDatabaseCreatePolyline(void) 2 { 3 //设置多段线的四个矢量 4 AcGePoint3dArray ptArr; 5 ptArr.setLogicalLength(4); 6 for (int i = 0; i < 4; i++) 7 { 8 ptArr[i].set((double)(i/2), (double)(i%2), 0.0); 9 } 10 11 //动态创建一个AcDb2dPolyline对象，在ptArr中给出四个顶点位置 12 //缺省的线宽为0 13 AcDb2dPolyline *pNewPline = new AcDb2dPolyline(AcDb::k2dSimplePoly, ptArr, 0.0, Adesk::kTrue); 14 15 //设置实体颜色 16 pNewPline->setColorIndex(3); 17 18 //获得块表对象指针 19 AcDbBlockTable *pBlockTable; 20 acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlockTable, AcDb::kForRead); 21 22 //获得模型空间块表记录指针 23 AcDbBlockTableRecord *pBlockTableRecord; 24 pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite); 25 26 pBlockTable->close(); 27 28 //将多段线对象添加数据库中并获得其对象ID 29 AcDbObjectId plineObjId; 30 pBlockTableRecord->appendAcDbEntity(plineObjId, pNewPline); 31 32 pBlockTableRecord->close(); 33 34 //设置多段线对象所在的层为0层 35 pNewPline->setLayer(L"0"); 36 37 pNewPline->close(); 38 39 iterate(plineObjId); 40 }
程序执行结果：
在图上画了一条多段线，并在命令行中输出每个顶点坐标，如下：
Vertox 0 location is : 0.000, 0.000, 0.000
Vertox 1 location is : 0.000, 1.000, 0.000
Vertox 2 location is : 1.000, 0.000, 0.000
Vertox 3 location is : 1.000, 1.000, 0.000
