[求助]：三维实体绘制问题

fengyuan95

需要实现一个功能，给点空间任意两个AcGePoint3d，需要沿着这条空间曲线绘制一个长方体，请问如何实现？

qinhongxian

//-----------------------------------------------------------------------------
// This is command 'CREATE, by HongxianQin [2005-4-13], Developer Department, AutoCAD
void Bpucreate()
{

        AcDbBlockTable *pBlkTable;
        AcDbBlockTableRecord* pBlkTableRecord;
        acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlkTable,AcDb::kForRead);

        pBlkTable->getAt(ACDB_MODEL_SPACE,pBlkTableRecord,AcDb::kForWrite);
        pBlkTable->close();

        AcGePoint2dArray ptArray;
        AcDbPolyline* pPoly;
        AcDbObjectId idExtrude;
        AcGePoint2d ptInput;
        AcGePoint2d ptVertex;
        Acad::ErrorStatus es;

        for(int j = 0;j<4;j++)
        {
                acedGetPoint(NULL,"选择点\n",asDblArray(ptInput));
                ptArray.append(ptInput);
        }


        pPoly = new AcDbPolyline(4);
       
        for(int i = 0; i < ptArray.length(); i++)
        {
                ptVertex = ptArray.at(i);
                pPoly->addVertexAt(i, ptVertex);
        }
       
        pPoly->setClosed(Adesk::kTrue);
       
        es = pBlkTableRecord->appendAcDbEntity(idExtrude, pPoly);
        pBlkTableRecord->close();
       
        pPoly->close();
       


}



void CreateSolidExtrude(AcDbPolyline* pPoly,AcDbObjectId &idExtrude,double height,double taper)
{

        AcDbBlockTable *pBlkTable;
        AcDbBlockTableRecord* pBlkTableRecord;


        Acad::ErrorStatus es;
    AcDbVoidPtrArray lines;
    AcDbVoidPtrArray regions;
       
    //AcDbObject   *pObj = NULL;
    //AcDbObjectId  idEnt;
    //ads_name      ename;
    //ads_point     pickpt;

        acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlkTable,AcDb::kForRead);
        pBlkTable->getAt(ACDB_MODEL_SPACE,pBlkTableRecord,AcDb::kForWrite);
        pBlkTable->close();
       
        //acedEntSel("\nSelect a polygon: ",ename, pickpt);       
        //acdbGetObjectId(idEnt, ename);
       
        //AcDbEntity  *pEnt;
        //acdbOpenObject(pPoly,idEnt,AcDb::kForWrite);


    pPoly->explode(lines);
       
    // Create a region from the set of lines.

    AcDbRegion::createFromCurves(lines, regions);
    //assert(regions.length() == 1);
    AcDbRegion *pRegion  = AcDbRegion::cast((AcRxObject*)regions[0]);
    //assert(pRegion != NULL);

    // Extrude the region to create a solid.
    AcDb3dSolid *pSolid = new AcDb3dSolid;
    pSolid->extrude(pRegion, height, taper);
       
//        acedGetVar()
/*
        for (int i = 0; i < lines.length(); i++) {
            delete (AcRxObject*)lines;
        }
           
        for (i = 0; i < regions.length(); i++) {
            delete (AcRxObject*)regions;
        }*/
   
       
    pSolid->setPropertiesFrom(pPoly);
        es = pBlkTableRecord->appendAcDbEntity(idExtrude, pSolid);
       
        //pSolid->draw();
        /////////////////////////////////////////
        pBlkTableRecord->close();
       
        pPoly->close();
        pSolid->close();


}
//-----------------------------------------------------------------------------
// This is command 'CREATESD, by HongxianQin [2005-4-13], Developer Department, AutoCAD
void Bpucreatesd()
{

        AcDbBlockTable *pBlkTable;
        AcDbBlockTableRecord* pBlkTableRecord;

        AcDbPolyline* pPoly= NULL;
        AcDbObjectId idExtrude;
        double height= 50.0;
        Acad::ErrorStatus es;
    AcDbVoidPtrArray lines;
    AcDbVoidPtrArray regions;
       
    AcDbObject   *pObj = NULL;
    AcDbObjectId  idEnt;
    ads_name      ename;
    ads_point     pickpt;

        acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlkTable,AcDb::kForRead);
        pBlkTable->getAt(ACDB_MODEL_SPACE,pBlkTableRecord,AcDb::kForWrite);
        pBlkTable->close();
       
        acedEntSel("\nSelect a polygon: ",ename, pickpt);
       
        acdbGetObjectId(idEnt, ename);
       
        //AcDbEntity  *pEnt;
        acdbOpenObject(pPoly,idEnt,AcDb::kForWrite);


    pPoly->explode(lines);
       
    // Create a region from the set of lines.

    AcDbRegion::createFromCurves(lines, regions);
    //assert(regions.length() == 1);
    AcDbRegion *pRegion  = AcDbRegion::cast((AcRxObject*)regions[0]);
    //assert(pRegion != NULL);
       
    // Extrude the region to create a solid.
    AcDb3dSolid *pSolid = new AcDb3dSolid;
    pSolid->extrude(pRegion, height, 0.4);
       
/*
        for (int i = 0; i < lines.length(); i++) {
            delete (AcRxObject*)lines;
        }
           
        for (i = 0; i < regions.length(); i++) {
            delete (AcRxObject*)regions;
        }*/
   
       
    pSolid->setPropertiesFrom(pPoly);
        es = pBlkTableRecord->appendAcDbEntity(idExtrude, pSolid);
       
        //pSolid->draw();
        /////////////////////////////////////////
        pBlkTableRecord->close();
       
        pPoly->close();
        pSolid->close();
}

//-----------------------------------------------------------------------------
// This is command 'SOLIDTEST, by HongxianQin [2005-4-13], Developer Department, AutoCAD
void BpusolidTest()
{

        //创建轮廓线
       
        AcGePoint2dArray ptArray;
        AcDbPolyline* pPoly;
        AcDbObjectId idPoly1,idPoly2;
        AcGePoint2d ptInput;
        AcGePoint2d ptVertex;
       
        for(;acedGetPoint(NULL,"选择点\n",asDblArray(ptInput))==RTNORM;)
        {

                ptArray.append(ptInput);
        }
       
       
        pPoly = new AcDbPolyline(ptArray.length());
       
        for(int i = 0; i < ptArray.length(); i++)
        {
                ptVertex = ptArray.at(i);
                pPoly->addVertexAt(i, ptVertex);
        }
       
        pPoly->setClosed(Adesk::kTrue);
       
        addToModelSpace(idPoly1,pPoly);
       

        //创建轮廓线2
    AcDbPolyline *pPloyOut;
    acdbOpenObject(pPloyOut, idPoly1, AcDb::kForRead);
       
    // Now generate an ellipse offset by 0.5 drawing units.
    //
    AcDbVoidPtrArray curves;
    pPloyOut->getOffsetCurves(20.0, curves);
    pPloyOut->close();
       
    addToModelSpace(idPoly2, (AcDbEntity*)curves[0]);
       
        //

        acdbOpenObject(pPoly,idPoly1,AcDb::kForWrite);

        AcDbObjectId idSolid1,idSolid2;

        CreateSolidExtrude(pPoly,idSolid1,500.0,0.0);
        acdbOpenObject(pPloyOut,idPoly2,AcDb::kForWrite);
        CreateSolidExtrude(pPloyOut,idSolid2,500.0,0.5);       

        AcDb3dSolid *pSolid ;  
        acdbOpenObject(pSolid,idSolid2,AcDb::kForWrite);
       
        AcGeMatrix3d   mat;
        mat.setTranslation(AcGeVector3d(0,0,500.0));
        pSolid->transformBy(mat);
        pSolid->close();

       
}

Acad::ErrorStatus
addToModelSpace(AcDbObjectId &objId, AcDbEntity* pEntity)
{
    AcDbBlockTable *pBlockTable;
    AcDbBlockTableRecord *pSpaceRecord;
       
    acdbHostApplicationServices()->workingDatabase()
        ->getSymbolTable(pBlockTable, AcDb::kForRead);
    pBlockTable->getAt(ACDB_MODEL_SPACE, pSpaceRecord,
        AcDb::kForWrite);
       
    pSpaceRecord->appendAcDbEntity(objId, pEntity);
       
    pBlockTable->close();
    pEntity->close();
    pSpaceRecord->close();
       
    return Acad::eOk;
}

fengyuan95

非常感谢你的答复。
你的程序中用的是AcGePoint2d ptInput，这样生成的截面是在XY平面上，然后再向Y轴拉伸。
我需要做到的是空间的两个点，起点和端点连接成空间直线，那么截面的原点在起点，截面的法向是两点连成的直线，拉伸是沿着这条空间直线。

binbin

在原点创建长方体，然后移动他

lzh_sf

可以用拉伸的方法实现

gui_cx

谢谢各位,给了我很大的帮助,我试试.

fengyuan95

5楼的朋友能说的详细些吗？
我用过直接调用CAD命令的方式来做，但是有时候会出现无法拉伸的现象，
如果是画圆柱，可以设置截面园的vector，能实现我需要的功能，就是画非园的截面，不知道如何将XY平面的坐标转换到空间直线的法平面上

evergreenxq

我需要这段代码?
可我不能下怎么办?