[ARX程序]：那位真的不能帮一下忙吗？

chsqchne

[php]
// 以下代码调试，执行成功!
        ads_name ss,ent;
        acedSSGet(NULL,NULL,NULL,NULL,ss);
        AcDbObjectId Id;
        long leng;
        if(acedSSLength(ss,&leng)!=RTNORM)//获得选择集包含的个数保存在参数leng中。
        {
                acutPrintf("\n没有选中何何目标!");
                acedSSFree(ss);//释放选择集
                return;
        }
        //将依次显示所选对象的ID号
        for(long i=0;i<leng;i++)
        {
                if(acedSSName(ss,i,ent)!=RTNORM)//返回指定索引号i的实体名ent
                        continue;
                if(acdbGetObjectId(Id,ent)!=Acad::eOk)
                        continue;
                //打开实体写
                AcDbEntity *pEnt;
                if (acdbOpenObject(pEnt,Id,AcDb::kForWrite) != Acad::eOk)
                        return;
                AcGeMatrix3d Mat;
                AcGeScale3d  Scale(2,2,2);
                Scale.getMatrix(Mat);
                pEnt->transformBy(Mat);//把变换矩阵作用的实体上后，实体就缩小了
                //以上代码实现选择到的实体放大2倍，可是晓东您论坛在<<[求助]：我想要模拟Acad的ALIGN命令，实体的转换矩阵怎么写？>>
                //说过："如果X,Y,Z比例不同，那么就要用AcGeScale3d对象，设置好X,Y,Z后，用AcGeScale3d::getMatrix(..)得到矩阵。"
                //我将得到的矩阵作用到实体上，同比缩放：执行成功; 不同比例：没有效果。请问为何会这样？怎样才能实现不同比例缩放？
                pEnt->close();
        }
        acedSSFree(ss);
[/php]

XDSoft

最初由 chsqchne 发布
[B][php]
// 以下代码调试，执行成功!
        ads_name ss,ent;
        acedSSGet(NULL,NULL,NULL,NULL,ss);
        AcDbObjectId Id;
        long leng;
        if(acedSSLength(ss,&leng)!=RTNORM)//获得选择集包含的个数保存在参数leng中。
... [/B]

1、ACAD里面，普通实体只能等比例缩放。如果你做成块，才可以变比例缩放。

2、模拟ALIGN命令，你得到两个参考向量后，可以用AcGeVector3d类的rotateTo得到对齐变换矩阵：

2. 
   
3. AcGeVector3d::rotateTo Function AcGeMatrix3d
   
4. 
   
5. rotateTo(
   
6. 
   
7. const AcGeVector3d& vec,
   
8. 
   
9. const AcGeVector3d& axis = AcGeVector3d::kIdentity) const;
   
10. 
    
11. vec Input vector
    
12. axis Input perpendicular vector
    
13. 
    
14. Returns a matrix mat such that mat x this vector yields the argument
    
15. 
    
16. vector vec.
    
17. 
    
18. There is no unique matrix to represent a rotation from this vector to vec
    
19. when they are parallel and in opposite directions. In this case, the
    
20. argument axis is used (if it is perpendicular to this vector) to uniquely
    
21. determine the resultant matrix. axis defaults to the zero-length vector, in
    
22. which case an arbitrary (but correct) matrix will be returned that rotates
    
23. this vector to vec.
    
24. 
    
25. Contract: This vector and vec must be non-zero length.
    

<br /> AcGeVector3d::rotateTo Function AcGeMatrix3d<br /> <br /> rotateTo(<br /> <br /> const AcGeVector3d& vec,<br /> <br /> const AcGeVector3d& axis = AcGeVector3d::kIdentity) const;<br /> <br /> vec Input vector <br /> axis Input perpendicular vector <br /> <br /> Returns a matrix mat such that mat x this vector yields the argument <br /> <br /> vector vec. <br /> <br /> There is no unique matrix to represent a rotation from this vector to vec <br /> when they are parallel and in opposite directions. In this case, the <br /> argument axis is used (if it is perpendicular to this vector) to uniquely <br /> determine the resultant matrix. axis defaults to the zero-length vector, in <br /> which case an arbitrary (but correct) matrix will be returned that rotates <br /> this vector to vec.<br /> <br /> Contract: This vector and vec must be non-zero length.<br />

qren25

高手就是高手

chsqchne

多谢了!我试一下!

XDSoft

最初由 chsqchne 发布
[B]多谢了!我试一下! [/B]

好，等写好了，把代码贴到论坛来吧，谢谢！