Re: [osg-users] Implementing clone() on class derived from osg::Geometry and osg::MatrixTransform
Hi Peter,
I think you question is really about overriding virtual methods in
C++, but I'm not sure.
If call geometry-clone() and the geometry object is an instance of
PiFaceGeometry then the clone method called will be
PiFaceGeometry::clone() even if the geometry pointer you have is of
the parent class osg::Geometry. i.e.
PiFaceGeometry* myFaceGeometry = new PiFaceGeometry;
Geometry* geometry = myFaceGeometry;
geometry-clone(); // will call PiFaceGeometry::clone().
Robert.
On 30 November 2011 12:18, Peter Bako bakopet...@gmail.com wrote:
Hello guys!
I have run a search over the topics, but I didn't find an answer for my
question, so here it is:
I have my own derived class called PiFaceGeometry, which is derived from
osg::Geometry class, I use this to work with faces of solids - so I have the
type of face - cylinder, plane, and other which I store within this class and
also some other properties.
I have a different class called SolidComponent, which is derived from
osg::MatrixTransform and represent machinery workpieces and tools.
The problem is that sometimes I need to clone the SolidComponent (which
contains Geode as child with PiFaceGeometries, and can also contain other
SolidComponents as children). I think, I need a deep copy, because sometimes
I have to change the color of triangles, or am I wrong? The question is, how
should I reimplement the clone() function? I looked also into the osg source
code but I didn't understand the way, how to do this.
How can I force the program to call PiFaceGeometry::clone() if this is only a
child of object, on which I called clone()?
I am sorry If this question is silly, I am not a good C++ programmer and I
hate C++ :-P.
Thank you for your responses!
Cheers,
Peter
Code:
class PiFaceGeometry: public osg::Geometry {
public:
osg::ref_ptrosg::IntArray edges;
PiSurfaceType surfType;
void changeFaceColor(osg::Vec4 color){...};
PiFaceGeometry * clone(const osg::CopyOp copyop ){
//how can I reuse Geometry::Clone(), if it returns a Geometry but I need
PiFaceGeometry?
}
};
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http://forum.openscenegraph.org/viewtopic.php?p=44132#44132
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Re: [osg-users] Implementing clone() on class derived from osg::Geometry and osg::MatrixTransform
Hi, clone method is virtual and should return osg::Object*. you can dynamic cast (or even static cast if you are sure) to PiGeometry*. How can I force the program to call PiFaceGeometry::clone() if this is only a child of object, on which I called clone()? I am sorry If this question is silly, I am not a good C++ programmer and I hate C++ Learn something about virtual functions and polymorphism. Virtual functions does the magic for you and calls appropriate functions, if it's called from parent class. About DEEP and SHALLOW copy: shalow copy makes memberwise clone, so every variable in original object copies to new one. Only problem there is pointer, new object have same value and points to same objects. For example with shalow copy MatrixTransform, new one will have shared children with original. But deep copy (there are several types - deep copy all, deep copy children etc.) copies them too. What this does mean for your: you can simply call osg::Geometry::clone() and then do your job: copy variables edges and surfType, according to copyop (share array in shalow copy). Cheers, Filip -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44332#44332 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Implementing clone() on class derived from osg::Geometry and osg::MatrixTransform
Hello guys!
I have run a search over the topics, but I didn't find an answer for my
question, so here it is:
I have my own derived class called PiFaceGeometry, which is derived from
osg::Geometry class, I use this to work with faces of solids - so I have the
type of face - cylinder, plane, and other which I store within this class and
also some other properties.
I have a different class called SolidComponent, which is derived from
osg::MatrixTransform and represent machinery workpieces and tools.
The problem is that sometimes I need to clone the SolidComponent (which
contains Geode as child with PiFaceGeometries, and can also contain other
SolidComponents as children). I think, I need a deep copy, because sometimes I
have to change the color of triangles, or am I wrong? The question is, how
should I reimplement the clone() function? I looked also into the osg source
code but I didn't understand the way, how to do this.
How can I force the program to call PiFaceGeometry::clone() if this is only a
child of object, on which I called clone()?
I am sorry If this question is silly, I am not a good C++ programmer and I hate
C++ :-P.
Thank you for your responses!
Cheers,
Peter
Code:
class PiFaceGeometry: public osg::Geometry {
public:
osg::ref_ptrosg::IntArray edges;
PiSurfaceType surfType;
void changeFaceColor(osg::Vec4 color){...};
PiFaceGeometry * clone(const osg::CopyOp copyop ){
//how can I reuse Geometry::Clone(), if it returns a Geometry but I need
PiFaceGeometry?
}
};
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=44132#44132
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