admin 发表于 2024-3-9 13:46:38

C++ ARX二次开发-BREP库

一、本节课程
C++ ARX二次开发-BREP库

二、本节要讲解的知识点
通过两个命令来演示BREP库的使用:获取圆柱体中圆柱面的特征参数;获取任何三维实体的边的采样曲线。

三、具体内容
1、思路:组合体(Complex)、壳(Shell)、面(Face)、边(Edge)和顶点(Vertex)都是BREP的常用对象。BREP访问组合体、壳、面、边、顶点,使用遍历的方法,可以通过子实体访问到某一个具体的对象。

2、实现:
(1)建立了一个新的项目,并且需要引用BREP库的LIB,INC目录,在附加依赖项里面链接对应的库。

(2)添加两个命令:

ACED采用ARXCOMMAND采用ENTRY采用AUTO(CBrepTestApp, yunyouMyGroup, GetCylinderInfo, GetCylinderInfo, ACRX采用CMD采用MODAL, NULL)

ACED采用ARXCOMMAND采用ENTRY采用AUTO(CBrepTestApp, yunyouMyGroup, GetBoundayCurves, GetBoundayCurves, ACRX采用CMD采用MODAL, NULL)



static void yunyouMyGroupGetCylinderInfo () {



AcDbEntity *pEnt=NULL;

AcGePoint3d pickPoint;

if (CSelectUtil::PromptSelctEnts(TEXT("\n选择三维实体:"),AcDb3dSolid::desc(),pEnt,pickPoint))

{

//建立一个BREP对象

AcBrBrep brepEnt;

brepEnt.set(*pEnt);



//创建一个面的遍历器

AcBr::ErrorStatus returnValue=AcBr::eOk;

AcBrBrepFaceTraverserbrepFaceTrav;

returnValue=brepFaceTrav.setBrep(brepEnt);



while ((!brepFaceTrav.done()) &&(returnValue==AcBr::eOk) )

{

AcBrFace brFace;

AcBr::ErrorStatus es=brepFaceTrav.getFace(brFace);

if (es==AcBr::eOk)

{

AcGeSurface *pAcGeSurface;

brFace.getSurface(pAcGeSurface);



AcGeExternalBoundedSurface *ebSurf=(AcGeExternalBoundedSurface*)pAcGeSurface;

if(ebSurf!=NULL && ebSurf->isCylinder())

{

AcGeCylinder *pCylinder=(AcGeCylinder*)ebSurf;

acutPrintf(TEXT("\n圆柱面的信息:"));

acutPrintf(TEXT("\n半径:%.2f"),pCylinder->radius());

AcGePoint3d center=pCylinder->origin();

acutPrintf(TEXT("\n中心点:(%.2f,%2.f,%.2f)"),center.x,center.y,center.z);

AcGeVector3d axis=pCylinder->axisOfSymmetry();

acutPrintf(TEXT("\n轴线向量:(%.2f,%2.f,%.2f)"),axis.x,axis.y,axis.z);

}

delete pAcGeSurface;

}

returnValue=brepFaceTrav.next();

}



pEnt->close();



}



}



static void yunyouMyGroupGetBoundayCurves () {



AcDbEntity *pEnt=NULL;

AcGePoint3d pickPoint;

if (CSelectUtil::PromptSelctEnts(TEXT("\n选择三维实体:"),AcDb3dSolid::desc(),pEnt,pickPoint))

{

//建立一个BREP对象

AcBrBrep brepEnt;

brepEnt.set(*pEnt);



//创建一个面的遍历器

AcBr::ErrorStatus returnValue=AcBr::eOk;

AcBrBrepEdgeTraverserbrepEdgeTrav;

returnValue=brepEdgeTrav.setBrep(brepEnt);



if(returnValue==AcBr::eOk)

{

while ((!brepEdgeTrav.done()) &&(returnValue==AcBr::eOk) )

{

AcBrEdge brEdge;

brepEdgeTrav.getEdge(brEdge);

AcGeCurve3d *pGeCurve=NULL;

if (brEdge.getCurve(pGeCurve)==AcBr::eOk)

{

AcGeCurve3d *pNativeCurve=NULL;

Adesk::Boolean bRet=((AcGeExternalCurve3d*)pGeCurve)->isNativeCurve(pNativeCurve);

int numSample=180;

AcGePoint3dArray points;

pNativeCurve->getSamplePoints(numSample,points);

if (pNativeCurve->isClosed()&& points.length()>0)

{

points.append(points);

}

delete pNativeCurve;

delete pGeCurve;

if (points.length()>2)

{

CPolylineUtil::Add3dPolyline(points);



}

}

returnValue =brepEdgeTrav.next();

}



}

pEnt->close();

}

}

记得包含头文件:

#include "SelectUtil.h"

#include "brbrep.h"

#include "brbftrav.h"

#include "brbetrav.h"

#include "brface.h"

#include "bredge.h"

#include "PolylineUtil.h"



3、如何添加现有项:

解决方案资源管理器->右键->添加现有项,(事先从已有的代码目录中拷贝需要的头文件和源文件到目标项目中),选择.H和.CPP文件,添加即可。

4、测试效果:(1) GETCYLINDERINFO命令的效果:

命令: GETCYLINDERINFO

选择三维实体:

圆柱面的信息:

半径:814.03

中心点:(7005.37,968,1249.41)

轴线向量:(0.00, 0,1.00)
页: [1]
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